Since your set-up is pinion driven, the pinion rpm will never be greater
than engine rpm divided by your gear ratio. (6,000 engine rpm /3.00 rear
gear = 2000 pinion rpm). (assuming you transmission top gear is direct or
1:1). Using these assumptions a pulley ratio of 4.25:1 would yield a 8,500
alternator rpm at the lights.
i hate to diasagree but the pinion rpm will equal the engine rpm if the top
trans gear is 1:1, the axle rpm however will be 2000 rpm in the above
example.
an alternator will put out plenty if you drive it at half the rpm that a
stock engine drives it. it is common in bracket racing to slow the
alternator really drastically to cut parasitic loss of hp . it is also
common to slow the water pump if driven by the crankshaft, free hp kinda .
on another note , water flow ........... if you pump the water too fast
through an engine it will not have time to absorb the heat from the engine
nor will it dwell in the radiator long enough to get cooled by it , you will
have cool water and hot spots in the engine. a 1.5 inch hole in the outlet
is entirely too big to keep the water flowing at the proper speed i would
guess that about a 5/8 or 3/4 inch hole would be appropiate. have to monitor
the water temp to find the proper solution for each engine as they are all a
little different.
Don T.
EVO Power & Machine
www.accessatc.net/~piggy
www.snartracing.com
---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.581 / Virus Database: 368 - Release Date: 2/9/2004
|