Reduction Pulley
Thread Starter
Racer
Joined: Aug 2004
Posts: 370
Likes: 0
From: Rockford Michigan
Reduction Pulley
If I put a 25% crank reduction pulley on my 383 what is that going to do to the cooling/charging systems? Logically a reduction pulley on the crank shaft will cause the w/p and the alterantor to spin slower, but will this be enough to cause cooling and charging issues?
Le Mans Master
Joined: Aug 2000
Posts: 6,273
Likes: 14
From: Austin TX
I tried this on my 350 and had charging problems and went back to the full sized pulley on the alt. No problem with cooling but I had a new water pump and radiator.
I don't think the slight increase in power will be noticeable on the street at lower RPM. Since you are running a 383 which are typically torque motors operated below 5,000 RPM, high RPMs where
the decreased drag resulting in more power does not really come into play.
I don't think the slight increase in power will be noticeable on the street at lower RPM. Since you are running a 383 which are typically torque motors operated below 5,000 RPM, high RPMs where
the decreased drag resulting in more power does not really come into play.
Le Mans Master
Joined: Jan 2006
Posts: 9,192
Likes: 27
From: Boca Raton Florida
at Idle you may very well run into a low voltage problem, it may or may not be a serious probem, it just means that at low engine speeds the cars electrics will be battery powered. IMHO those reduction kits harvest very little in the way of HP, certainly not enough to justify the co$t and then ya have to figure in the hassle factor..
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
For a street car don't do it. It is not worth the 1 or 2 hp it will gain you on the street. If your race motor is turning 5000+ rpm all the time it might be OK. Most of the time a street motor is at or below 2500rpm. Not needed.
