pulley

jeprox

i heard that changing the pulley will increase more horsepower. i just wanted to find out if this is true and what are the drawbacks. also, does this work on any type of engine?

thank you.

Mr_Shiftright

It doesn't really produce more horsepower but it releases more to the wheels and away from the accessories. The results vary considerably but aren't really that much, let's say maybe 3% on a 170-200 HP engine.

There are definite problems and cautions with using power pulleys. Some very experienced tuners are not in favor of them, such as Steve Dinan of Dinan BMW---and he knows a thing or two. Sometimes they will screw up alternator output (on high output units) and sometimes interfere with harmonic balancing.

It's a subject that requires a lot of consideration of cost and gain on one side and risks on the other.

jeprox

thanks for the info.
i'm looking at different ways to increase power including changig pulleys. sounds like this is not the way to go!

thanks again.

Mr_Shiftright

WEll, by all means explore all the info you can get on pulleys. I just didn't want you to go in without looking at all the pros and cons. I could use more studying on the subject myself, but I do recall rejecting the idea for my own cars. They might be a better idea for stripped down 'street' cars that do a lot of drag racing, as the pulleys apparently help overcome the inertia of the accessories at low rpm.

But like everything regarding speed equipment, you trade off.