How much power is a full point of compression worth...
#3
TECH Veteran
Join Date: Dec 2001
Location: Ft. Lauderdale, FL, USA
Posts: 4,117
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Phil99vette
3-4% is the rule of thumb I have always used.
Phillip
Phillip
My leakdown tests showed as high as 45% leakdown, considering an average leakdown of 25-30%.
How much would a 500 RWHP N/A motor be down?
#5
TECH Fanatic
iTrader: (16)
Join Date: Oct 2003
Location: Ruffin,N.C.
Posts: 1,456
Likes: 0
Received 0 Likes
on
0 Posts
I have been wondering the same thing. a friend of mine blew his motor up and went from stock bore 11.5-1 comp, to 60 over flat top (not sure of what final comp. ratio he ended up with ) with the same set of heads and everything. the heads were shaved a little im sure after the blow up but not sure how much. i was wondering which one would make more power? does anybody know?
#7
If the cam is not too large for the original compression then theoretically, according to D.Vizard How to Build Horsepower Vol. 1 the gain is
10:1 -> 11:1 1.5%
11:1 -> 12:1 1.3%
12:1 -> 13:1 1.2%
A 450rwhp 346 has quite a radical cam so the suggested 3-4% could probably be realized going from 11:1 to 12:1 due to getting the dynamic compression better. No personal experience about this though.
10:1 -> 11:1 1.5%
11:1 -> 12:1 1.3%
12:1 -> 13:1 1.2%
A 450rwhp 346 has quite a radical cam so the suggested 3-4% could probably be realized going from 11:1 to 12:1 due to getting the dynamic compression better. No personal experience about this though.