etec-II underdrive pulley development

[Daox]

Nope, but I will follow up with some of the suppliers today.

[xintersecty]

count me in too. I can use something like this.....

[reddemonx92]

Cool and yea im in once everything is finished and you hear back from the suppliers

[AveoSS]

I'm on this deal too! Would we need to replace the OEM belt with a smaller one since the pulley be smaller?

[thehunterooo]

its the same size I think, but weighs alot less

[AveoSS]

No, he sayd its a underdrive(smaller). Well probably have to get a smaller aftermarket belt.

[trempus]

it's called underdrive but really means light weight

[reddemonx92]

yea i dont think they will make pulleys that require aftermarket belts

[Daox]

The quotes are all in and I'm putting together an official list for the group buy.

etec underdrive pulley group buy

[Pontiac1976]

Anyway, I have actually been thinking about this for a while. An underdrive crankshaft pulley is a very simple mod that is usually pretty low cost. It works not only by being lighter in weight than the original pulley (less rotational mass like a lightweight flywheel), but also by being smaller in diameter. This in turn spins your accessories slower which frees up some horsepower as well.

I thought that if the crank pulley was bigger that it would slow the belt down (rotate truns of the belt) smaller would speed up the belt & speed up the rpms of the Alt,A/c pump.
Just trying to under stand. maybe I lost something from the working on 1970's v8?? thanks