I don't know about v8's, but on the 4bangers underdrive pulleys are able to free up
gobs of power due to their weight. The underdrive pulley is 25% smaller in
diameter and 80% lighter.
I have not installed an underdrive pulley on my durango yet because I am afraid of
throwing the balance off. Is the crank pulley also a harmonic balance? if so,
what will the effect be of long term underdrive pulley use?
-- -=Mike Kuriger 1991 Isuzu Impulse RS 1.8 2000 Dodge Durango SLT 4x4 4.7Terry Herrin wrote:
> On 6 Oct 00 08:36:46 MDT, Kevin <ks14at@usa.net> wrote: > >understand how the underdrive crank pulley works, are you saying that the > >pulley circumference is smaller than stock? If so do you also need to go to a > >shorter belt, and how does this affect the belt-driven systems because they > >are now turning slower(alternator, A/C, power steering)? I know all too well > > Kevin, > I am running an ASP underdrive crank pulley. It's 5.5" in diameter, > the stock pulley was 7". I did have to change to a shorter belt. The > whole idea is to slow down all the accessories you list so you get > more power to the ground. I have had mine for over 10,000 miles and > so far no problems at all. I cannot tell a difference in charging, > steering, cooling, or A/C performance. > > Terry Herrin > 99 FR CC R/T > 14.769 @ 91.43 > Wilmington, NC > http://users.isaac.net/therrin/dakota.html
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