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Mazda RX-8

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Comments

  • trispectrispec Member Posts: 305
    My dealer's mechanic can't heard the popcorn/rattle I hear clearly enough, so they can not do anything they said.

    Is there a recall for the RX-8 AT in the works. I'm ready to get this solved. The car has 12500 miles on it. I don't want to risk engine damage. What should I do?

    The one time with the 87 octane, RPM over 5000, the popcorn/rattle turned to a loud ball baring/rattle. But only that one time.

    This is getting scary. My RX-8 AT's popcorn/rattle noise, which I notice mostly during low speed low RPM when I'm pressing back and forth on the gas peddle is mild and mostly not there when I listen with the windows up or down. If I'm driving beside a Jersey barrier or high curb, I can hear the popcorn/rattle clearly when it happens.
  • pathstar1pathstar1 Member Posts: 1,015
    Usually even without the knock prevention system when you experience knock you will notice more than just the noise. Sometimes an increase in power, sometimes a decrease - the knock upsets the engine physically. You may be hearing fuel burning exposively in the exhaust system. Generally this wouldn't cause damage. Does it happen when the engine is still cold or only when it's warm? If it doesn't happen with a cold engine it's probably fuel burning in the exhaust. This would make sense, as Mazda had to burn fuel in the cat. to keep it warm and working - one of the reasons the car gets such poor mileage. If it's really knock, it should be worse on days when the air is cold - cold air is denser and that can lean out the mixture a bit more making knock more likely.
  • trispectrispec Member Posts: 305
    Thanks Pathstar for the reply.

    Wow, this is the first I've heard of "exhaust burning explosively" in the exhaust system. Would the auto tranny models exhibit more of this issue?

    I've never noticed any kind of power surge or power decrease. Of course with the automatic tranny constantly shifting in Boston's traffic, it would be hard to notice small power fluctuations. Certainly nothing hugely out of the ordinary ever happens.

    Yes, the gurgle/popcorn/rattle is less with a cold engine. Once the water temp gauge reaches vertical I can hear more gurgle/popcorn/rattle on the the first strong take off as I get on the first major road way.

    As for cold ambient temperatures, the gurgle/popcorn/rattle seems the same.

    As for millage, I get 14-15MPG in the city driving. And 23-25MPG on the highway.
  • pathstar1pathstar1 Member Posts: 1,015
    There are many possibilities as to why you hear the sounds and others don't. I haven't driven an automatic, but they may be quieter than the manuals (the manual trans. tend to "whine" and the sycros sound like turbos spooling up from time to time), so both may make the sounds but only you can hear them. The PCM (engine computer) is different as the engine is different. It may be running a little richer. It's possible the lower RPM the auto. runs may have allowed some buildup of carbon in the exhaust. It could be acting as an ignition source for the excess fuel these cars are known to put out the exhaust (to heat the cat).

    It sounds like you don't have detonation, which is not surprising, as if it were detonation I suspect you would have engine trouble by now. Keep an eye on it, make sure Mazda NA (not just the dealer) has recorded your complaint, just in case.
  • trispectrispec Member Posts: 305
    I believe I've got an explanation for the single event of detonation that I thought I had back when there was a tank of 87 octane in my RX-8 AT. I think what I heard was the AC celliniod firing.

    The other day, after weeks of rain, summer temps returned and I turned on the AC. I was running in manual shift mode and the RPM was up around 6000 when I shifted. A horrible cracking sound occurred. Like a single misfire/backfire. There was no loss of power, no check engine light. I think it was the AC. Does the AC disengage the compressor at high RPM.
  • pathstar1pathstar1 Member Posts: 1,015
    The AC disengages the clutch on the compressor around 6000 RPM. It's an electric clutch.
  • trispectrispec Member Posts: 305
    So 90 degree F days are here, the gurgle/popcorn/rattle, now presumed to be normal exhaust detonation, does seem a little more pronounced in this hot weather.

    So what is the process for filing a concern with this presumed normal behavior. My dealer says there must be some other indication, check engine lite or smoke, before they can file an official complaint. I'm willing to live with the little noise, as there does not seem to be any other evidence of the problem, but I'd like to at least document with Mazada USA, the concern.
  • pathstar1pathstar1 Member Posts: 1,015
    Phone the Mazda customer care number. Explain your concerns and what the dealer has said. Ask them to open a file, but be polite. They -should- open a file for you with the symtoms noted in it. Once that is done, any further damage will be their fault, if something is wrong as they will have been made aware of the situation.
  • late8late8 Member Posts: 7
    Have your dealer check the engine mounts if the vibration get worse. Due to heat issues, the engine mounts in some'04 models have been cracking and leaking(they're fluid filled) due to thermal heat breakdown. The new engine mounts come with a heat shield. There is a technical service bulletin from Mazda for this issue if your dealer is unaware of it.
  • trispectrispec Member Posts: 305
    My RX-8 AT is a 2005 Group 2 so supposedly all the known items were fixed before she left the factory.

    I did take Pathstar's advise and registered the issue with Mazda USA today. I described the noise as a gurgle/popcorn/rattle with popcorn being the closest best description. The Mazda guy on the phone was very nice, and took down, the details of my cars millage, purchase dealer's name, description of the sound, and the fact that there are no other issues or problems.

    I called the contact number 1-800-222-5500 on the mazdausa.com web site and then held on the phone for five minutes for someone to talk to.
  • chessiechessie Member Posts: 9
    I have had my RX8 for a year and a half. It's junk in a beautiful wrapper. If you are having problems contact someone, do not be silent the problems will not go away I tried to believe they would. Tomorrow Mazda takes back my :lemon: Lemon RX8. :cry: I will miss the looks but not the :mad: headache. Good luck to you all, but remember to make Mazda accountable for what problems they have caused you. You have the right to not only looks but reliable performance as well.
  • trispectrispec Member Posts: 305
    Car and driver - "Best Sports Coupe" and "Top Ten Pick three years running.
    http://www.caranddriver.com/bestcars/8923/10best-cars-best-sports-coupe.html

    Consumer Reports - "Recommended best buy."
    http://www.consumerreports.org/cro/cars/models/mazda/rx8/model-overview-4335-515- 6.htm

    Road & Tracks Long Term tests of a 2004 RX-8 MT shows good solid sports car driving and no significant problems after 22K. Road and Track long term testing continuously pushes the test cars to the limit, so a good rating is quite a positive rating. http://www.roadandtrack.com/article.asp?section_id=4&article_id=2172&page_number- =4
  • pathstar1pathstar1 Member Posts: 1,015
    For those of us who are rotary enthusiasts it may be hard to believe, but there are cases where the RX-8 may not be the best car for you.

    1. As with any manufacturer, any model (as seen on these forums), you can end up with a "lemon". I suspect the dealer competence factors into this as well.

    2. The rotary engine and the RX-8 handling traits may conflict with some peoples abilites or habits. Signs of constant flooding, clutch wearout, etc. are a warning. It may be best to reconsider if it really is the car for you if this is seen.

    3. The rotary engine is still not the most efficient design. You have to PAY to play.

    From what I've seen there appear to be several types of "thought processes" resulting in purchase of an RX-8. There are those who want the performance and are willing to put up with "quirks" to get it. Then there are those who just want to look cool by driving an RX-8. For some it may be more reasonable to locate a "normal" car that just looks cool, rather than -being- cool and unique.
  • trispectrispec Member Posts: 305
    Agreed. Owning an RX-8 takes some affirmative commitment to the RX-8 beyond the stereotypical consumer expectations largely based on traditional engine and car design.
  • plektoplekto Member Posts: 3,738
    People just are too jaded and want a 4-wheeled appliance. The RX-8 is not really any different than, say, a motorcycle. See, 95% of motorcycles have carbs on them. And they require you to rev it up to get power. There's just nothing at the bottom-end of something like a Ninja 250. It requires you to rev it. And warm it up. And check the fluids. And so on.

    But pathstar1 is correct - it's just not for everyone.
  • trispectrispec Member Posts: 305
    People's pat responses to car discussions most often fall into MPG, torque/horse power, and engine size buckets. A car like the RX-8, which has numbers that don't fit in these three buckets nicely, gets constant criticism and tossed from consideration. MPG is so important these days, it's become a moral character issue NOT to be getting 30MPG.

    Mazda does no marketing to counter these stereo typical perceptions either, but seems to rely completely on the positive reviews by the car and consumer magazines. Of course I always think, "Zoom, zoom, zoom" traces back to the old "Hummmmmmmm" ads of the original rotary marketing, back when my uncle drove a rotary Mazda wagon.

    Mazda should punch up the RX-8 marketing along the lines of the "Tokyo Drifting" or the VOD cars pod casts. Compare a Porche and RX-8 flying along a mountain race way, both revving to 9000 RPM, diving into 1G hairpin turns, and hitting 90-100mph tree blurring speeds. The ad could end with, "The RX-8 is not a Porche, but for $50,000 less, the RX-8 sure drives like a Porche."
  • plektoplekto Member Posts: 3,738
    It doesn't drive like a Porsche. :)

    A better comparison would be to see it smoking an Audi A4 or IS250, then point out that it's the best small sports sedan under $30K - plus it looks like a sportscar. Make a big deal of the rear doors in the ad, perhaps with two guys talking or something, like Chevy did when the first rear doors came out on extended cab pickups. They need to really push this fact - that the rear two doors are there, but are hidden for artistic purposes - to look more sporty - but that it still is a sedan.

    Then they can whomp on the competition quite easily. I mean... Mercedes C230 with nothing on it or a fairly decently loaded RX-8? The IS250 doesn't have a hope in the world against it.

    It's no sportscar. It just looks like one. OTOH, it is a fantastic small sedan.(I see four doors last I checked)
  • trispectrispec Member Posts: 305
    I'll bet the RX-8 with the Speed package feels every bit as tight and hard as a Porche 911. OK, so $40,000 less then.

    But any head to head with whoever or whatever and I'll bet the price/performance goes to the RX-8 big time; except may a WRX, but that thing is just so UUUUUGLY it doesn't count.

    I'm gonna rig-up a Pod cast of my RX-8 AT running some Boston traffic rotories, with a bunch of camera shots of the tach revs, dyno stats and G-force lats. I wonder if Mazda is listening.

    Is there a go G-force instrument for the dash that's not to costly?
  • maltbmaltb Member Posts: 3,572
    Mazda advertises here...I'm sure someone is reading.
  • testyrossatestyrossa Member Posts: 1
    How about fuel economy? Does the RX-8 get good mileage?

    Ttesty :)
  • plektoplekto Member Posts: 3,738
    It's all relative. The engine develops a lot of power for its size, like a motorcycle engine. It also gobbles down fuel like a monster Harley or Hyabusa or simmilar - in relation to the ~40mpg 600CC streetbikes, that is.

    20mpg highway is about what you get. It's tuned for speed and not at all for economy. Then again, when you compare it to a Mustang with the V8 or something simmilar, it's not so unreasonable.
  • trispectrispec Member Posts: 305
    My 2005 RX-8 AT gets 13.5MPG (AC on) to 14.5MPG (AC off) in pure Boston traffic jamma ramma. On the Highway I get 23MPG going 85MPH and 25MPH going 60MPH.
  • ClairesClaires Member Posts: 1,222
    How about fuel economy? Does the RX-8 get good mileage?

    The folks in the Mazda RX8 Owners: MPG-Real World Numbers discussion could tell you.

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  • primm907primm907 Member Posts: 5
    Does anyone have any info regarding possible changes? Will horsepower and torque possibly increase? Are there any major/minor design updates in the works?
  • Karen_SKaren_S Member Posts: 5,092
  • grinningrinnin Member Posts: 13
    Does anyone know if Mazda includes the "black box" data recorders in RX-8s?? I have a 2004 6-sp. If so, any ideas on how to disable it? I really don't like the idea of those recorders.
  • trispectrispec Member Posts: 305
    Ah, you've been reading the news today. The insurance companies may have something to say about accident coverage if the black box is tampered with. Also, I doubt the car companies put these little things into their car's without some sort of governmental approval or encouragement in the first place. Turning off Air bags is not possible either.

    Me, I've got my tin foil hat on at all times.
  • pathstar1pathstar1 Member Posts: 1,015
    I haven't seen it mentioned in the shop manual, nor have I seen one in the car. You can easilly erase anything the PCM stores by disconnecting the battery.
  • trispectrispec Member Posts: 305
    Speaking of the battery. Is a week to long to leave the car without starting?
  • grinningrinnin Member Posts: 13
    The way I see it, when I buy the car, I buy the data recorder too (if it's in there). That information is mine to collect or not as I see fit. Once there's been an accident, I can be compelled to surrender the recorders information, but not if it isn't collected in the first place.
  • trispectrispec Member Posts: 305
    I don't see why the cops would be detered from just downloading the entire contents of the "Black box" the moment they walk up to a car. Hell, the U. S. cops, with all their new powers of electronic searching, probably have been doing it already, and are just waiting to spring it on us.

    Pulling tin foil down over my ears, I am.
  • rorrrorr Member Posts: 3,630
    The way I see it, when the insurance company sells a policy for a specific make and model of car, they may do it with the understanding that they have access to the vehicle data which describes what was happening immediately prior to an accident.

    It might be fun explaining to an insurance company why a data recorder was intentionally disabled. And then it might be fun explaining to that insurance company why they should still honor your policy.
  • pathstar1pathstar1 Member Posts: 1,015
    No, a battery in good condition will hold for at least a month. It's not a small battery in the RX-8. Do keep the battery clean - I like to wash the top every time I wash the car. Do also once a year check the fluid level (if you can) and top up with distilled water. If you can't (cells sealed) cest la vie - that's life.

    Once again, unless Mazda has snuck one in lately, the RX-8 doesn't have a recorder. Further, if you disconnect the battery for a few minutes, you will erase any trouble codes stored in the PCM (engine computer).

    If you want to worry about surveillance, turn off your cellphone.
  • jeff209jeff209 Member Posts: 3
    I just received a Recall on my 2005 RX-8 for the Emissions and I wonder if I take it in and they reprogram my computer and stuff are they going to make my car run any different that I can notice. It is saying I could have carbon build up and my plugs and converter could get build up. Any word on all this. Thank You
  • plektoplekto Member Posts: 3,738
    The car eats cats by its nature and it should be considered an expendable piece of equipment(and designed so it's as generic and simple to replace as possible, IMO, but that's another story).

    Why?

    The engine by design burns oil. Think of it as a 3-stroke engine(which is actually what it is - heh). 4-strokes optimally burn no oil, and 2-strokes burn oil mixed with their gas. This burns some oil via blow-by(somewhere between a 2 and a 4 stroke engine), but it's *NORMAL* for the car to run this way.

    ROTARY ENGINES NEED TO BURN OIL OR THEY WILL SELF-DESTRUCT.
    Mazda needs to hammer this home with massive campaigns or notices or something. But it also needs to use a $200 cat that's attached to nothing at all(O2 sensor and such well away) and cover them under their warranty)

    Unfortunately, oil damage cats over time, and there's nothing that can be done about it. Diesels do this, too, which is why they didn't have cats on them for decades.
  • pathstar1pathstar1 Member Posts: 1,015
    The rotary engine doesn't burn oil from blow-by. It injects it into the intake runners under computer control. It's true the oil is necessary, to lubricate the apex seals. Unlike a piston engine the rotary seal running area (the rotor housing) isn't exposed to the crankcase, so oil can't be "splashed" onto it from there. Also, because of this there can't be "blow-by" in a rotary. When the rings in a piston engine wear, the combustion gases can leak into the crankcase, overpressuring it, and forcing some oil back into the combustion chambers (on the intake cycle). In a rotary, worn apex seals just leak the gas into the next chamber.
    The rotor is "filled" with oil - the engine uses it to cool the rotors. Any leaks along the side oil seals will add too much oil to the combustion chambers. This may be the area that Mazda is worried about and is testing for.

    All manufacturerers must, by law, install a cat. that will last a certain number of miles. This is what Mazda is struggling to meet, by eliminating oil that can leak into the exhaust system, and carefully controlling the oil that is injected into the intake. Hence the computer control of the oil injector system. In the case of the renesis, there is further need to limit this oil - too much and the side exhaust ports will plug with carbon.

    Cats that can stand oil are just now coming on stream. They burn the carbon/heavy hydrocarbons in pulses something like an impulse jet engine. They are what will make diesel engines more acceptable in the US. They may also be what will save the renesis from extinction. I'll bet they aren't going to be cheap though. ;)
  • plektoplekto Member Posts: 3,738
    My bad about the way it burns oil, but the fact that they do burn oil normally is sometihng that the public needs to know about. That, and that the thing eats normal cats.

    So they should make the cat as simple and inexpensive as possible, then cover it under a 100K year warranty.

    It fails smog? Run it over to the dealership and they'll install a $200 cat(their cost) and you're good to go.

    I'd still own a RX-8, even with it burning oil.
  • pathstar1pathstar1 Member Posts: 1,015
    I don't think you understand. If the cat can't go the required distance, Mazda can't sell the RX-8 in your country. If they can't sell it, they will not make it. I agree your idea is good, it's just not possible under the current regulations in the US.

    The rabbit hole is much deeper than you imagine, grasshopper. ;)
  • plektoplekto Member Posts: 3,738
    I'm positive that they can get a waiver if they cover it under the warranty, since it's a different type of engine entirely.
  • trispectrispec Member Posts: 305
    Ouch. I found the document below via a google search (catalytic converter warranty). Is this still correct? If so, I can sure understand why Mazda is worried; 8 years or 80K miles on a cat seems very tough for the RX-8.

    Is the EPA document below what you sort of what you were referring to?

    ________________________________

    United States Air and Radiation EPA420-F-96-020
    Environmental Protection March 1996
    Agency

    Office of Mobile Sources
    ---------------------------------------------------------------------
    EPA Environmental Fact Sheet
    ---------------------------------------------------------------------

    EMISSIONS WARRANTIES
    FOR 1995 AND NEWER CARS & TRUCKS

    ......

    A. PERFORMANCE WARRANTY

    The Performance Warranty covers repairs which are required during the first 2 years or 24,000 miles of vehicle use because the vehicle failed an emission test. Specified major emission control components are covered for the first 8 years or 80,000 miles. If you are a resident of an area with an Inspection and Maintenance (I/M) program that meets federal guidelines, you are eligible for this warranty
    protection provided that:

    * Your car or light-duty truck fails an approved emissions test;and

    .......

    Design and Defect Warranty Coverage for 1995 and newer light-duty vehicles:

    * Emission control and emission related parts are covered for the first 2 years or 24,000 miles of vehicle use; and

    * Specified major emission control components are covered for the first 8 years or 80,000 miles of vehicle use.

    According to federal law, an emission control or emission related part, or a specified major emission control component, that fails because of a defect in materials or workmanship, must be repaired or replaced by the vehicle manufacturer free of charge as long as the vehicle has not exceeded the warranty time or mileage limitations for
    the failed part.

    .......

    What Are Specified Major Emission Control Components?

    There are three specified major emission control components, covered for the first 8 years or 80,000 miles of vehicle use on 1995 and newer vehicles:

    * Catalytic converters.

    * The electronic emissions control unit or computer (ECU).

    * The onboard emissions diagnostic device or computer (OBD).
  • pathstar1pathstar1 Member Posts: 1,015
    That's just the warranty. The EPA requires all vehicles sold to have cats. that -WILL- last the 80,000 mi. Some failures are to be expected, covered by the warranty, though I'm not sure if any allowed numbers are quoted in the law or ruling if it isn't a written law. If the manufacturer can't meet this, they can't sell the vehicle in the US. BTW, Canada has said "us too" to this ruling.

    No-one is allowed to change the cat with anything other than the stock approved part either. We have, using a Random Tech. 5" metallic one (and now revealed as guilty as charged ;) ). This uses a strip of stainless, impregnated with platinum and rohodium, crimped to a zig zag, rolled up and inserted into a stainless canister. They work, they last with higher temps., and being "high tech", I think they work better (three way cat, takes out hydrocarbons, CO and NOx). I even put one on my 3rd gen RX-7, replacing a mid-pipe, with no loss of power. They are called "ultra high flow cats". We had to use them on the RX-8 when we messed with the fuel mixture to get more power, as that overheated the stock cat.
  • plektoplekto Member Posts: 3,738
    are covered for the first 8 years or 80,000 miles of vehicle use

    They don't have to last any period of time. They just have to be covered free of charge by the company(which of course is a bit of a problem, since it's a chunk out of their profits)
  • trispectrispec Member Posts: 305
    BTW, I got my Extended Warranty Letter last week. I jumped on the MazdaUSA.com site to check if there had been any updates to the "Recall warning" that was listed in the "Owner" section of the Mazda site three weeks ago. It now seems that MazdaUSA has pulled the "Recall warning" down and replaced it with the standard "No recalls for your vehicle."

    Was that a mistake on the MazdaUSA.com web site, or is that normally how they tell folks about recalls on their vehicle?

    PathStar, did you say your RX-8 rotor side seal went bad. Is there an actual seal substance, like the Apex seal, on the sides of the rotors? Or is the oil in the rotor providing the seal? How does the rotor oil circulate?

    Sorry, I guess I need to buy a model of the Renesis.
  • pathstar1pathstar1 Member Posts: 1,015
    No, we think our metering oil pump failed. The failure sounded like an eccentric shaft bearing failure, though (which wouldn't be related to the metering oil pump). Of course Mazda never told us what they found when they got the engine back.

    The oil is pumped into the eccentric shaft - there is a hole in it that feeds the oil to the centre of the rotors. On each side of each rotor there is a circular seal just outside the sun gear. It's pressed into the side of the rotor. This keeps the oil from getting into the "side seals" and "corner seals". These two plus the apex seals keep the combustion gas in the chamber. The oil seals keep the oil in the rotor, and it lubricates the eccentric, which the rotor pushes on to turn the eccentric shaft. It also cools the steel rotor. Power is transmitted by the rotor pushing the eccentric - so you could say the "stroke" of the engine is the major diameter of the housing minus the minor dia. There are "stationary gears" that the rotor rides on (rotor has a sun gear on the edge of the centre hole - this keeps it in phase and aligned as it moves around but the rotor doesn't push against it to transmit power although there is reaction force against it - the stationary gear acts like a planet gear).
    The oil is pumped from the sump through the filter into the rear of the eccentric shaft, it flows through a hole into the rear rotor, then out another hole in the eccentric shaft to the front rotor, then out another hole to the front end of the eccentric shaft, and is dumped through a pressure regulator back into the sump. In this way all moving parts are lubed. except the apex seals, corner seals, and side seals. They get their lubrication from the oil that is injected into the intake stream. A very simple design in concept.

    Lots of people like to say the rotary is a "two stroke" engine. Mazda says it's a "four stroke" - I think it should be called a "continuous combustion" engine. It sounds like a two stroke because it is "piston ported" (rotor ported but whatever).
  • plektoplekto Member Posts: 3,738
    How about three-stroke? ;) It definately needs a classification that puts it in a category by itself. Peolpe think "Rotary" and these days it might as well be "VVT" or some other term to them. They think it's a different application of the same technology 95% of the time, since 4-stroke gas engines are all they've every known.
  • trispectrispec Member Posts: 305
    Agreed. The confusion is rampant. What should one tell the government agencies or even the automotive techs? In Boston, the inspection folks needed to know how many cylinder. The computer program needed an answer before it could continue processing my inspection sticker. So now, the government of my state officially thinks I drive a two cylinder car. I hope this does come back to bite me when I go for an EPA test where they stick that probe up the tail pipe.

    I can hear it now, "Well sir, that two cylinder engine you've got there is way out of spec, I can't allow you back on the road until you replace that engine completely."
  • jeffyscottjeffyscott Member Posts: 3,855
    The confusion is rampant.

    I read a review, don't recall where, that complained about the small displacement of the engine. Pay no attention to how the car drives or accelerates, just look at that 1.3L displacement number and say "that's small".
  • plektoplekto Member Posts: 3,738
    Well, antique technology from nearly 200 years ago is huge. ;)

    All that metal and wasted displacement. Of course you need 5L or more to get good results out of a 4-stroke engine. It's a hopeless kludge that's been made to work.

    Compare its efficiency to a rotary or better yet, a turbine engine. :)
  • rorrrorr Member Posts: 3,630
    Actually, to my (twisted) way of thinking, a two-rotor would be equivalent to a V6.

    Think about it. Three lobes (roughly akin to cylinders) x 2 rotors.

    Of course, that's not really fair to a V6. For every SINGLE revolution of a rotor, you get 3 power pulses (one for each lobe as it spins within the housing). So, for a two rotor design, you get 6 power pulses per revolution. But for a 4 stroke motor,you need TWO complete revolutions of the crankshaft for each cylinder to generate a power pulse. So, for a V6 engine you only get 3 power pulses per revolution of the crank. For this reason (rotaries use ALL their displacement in every revolution while piston engines use HALF of their displacment in every revolution) I've heard it said that a 1.3l rotary would be roughly analogous to a 2.6l V6.

    Another question regarding displacement:

    Is the displacement of a rotary engine the total displacement within the housing minus the displacment of the rotor itself? Or is the displacement measured as the maximum volume achieved within each lobe at the rotor spins x 3 lobes x 2 rotors?
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