Custom Cam Specs and SCR-DCR - Can someone check my math?
12-28-2007, 11:20 PM
#1
On The Tree
Thread Starter
iTrader: (5)
Join Date: Nov 2006
Posts: 134
Likes: 0
Received 0 Likes
on
0 Posts
Custom Cam Specs and SCR-DCR - Can someone check my math? So I'm buying a 408 short block next week and I'm trying to decide on a good cam for it. I also wanted to get a pretty fair idea of what my compression ratio would be with my current heads and whatever new cam I decide to get.
I used PianoProdigy's calculator and customized it for the motor/pistons/gaskets/cam I'm looking at. I kinda guessed on the deck height because I have no idea what it will end up being on the new shortblock, otherwise this should be pretty accurate
What does everyone think, would this cam be a good choice?
I used PianoProdigy's calculator and customized it for the motor/pistons/gaskets/cam I'm looking at. I kinda guessed on the deck height because I have no idea what it will end up being on the new shortblock, otherwise this should be pretty accurate
What does everyone think, would this cam be a good choice?
Last edited by PBMFIsMe; 12-28-2007 at 11:21 PM. Reason: I can't spell
12-29-2007, 09:23 AM
#2
TECH Addict
iTrader: (22)
Join Date: Sep 2004
Location: tennessee
Posts: 2,639
Likes: 0
Received 0 Likes
on
0 Posts
that 8.9 or so dcr will be really close to the edge of possibly spark knocking but i ran right at 9.0 on a stock cube motor on 93 without issues. how about maybe going with a 244 on the intake side to lower it a smidge ? just my $.02
12-30-2007, 09:24 PM
#3
On The Tree
Thread Starter
iTrader: (5)
Join Date: Nov 2006
Posts: 134
Likes: 0
Received 0 Likes
on
0 Posts
I was afraid a 12.4:1 SCR would be too much compression for 93 Octane.
I looked at a few other cam choices and several of them will get me a lower DCR, but I'm sure there is more to this than just DCR.
If I went wish -10cc Dish pistons instead of -2cc, my SCR drops to around 11.28:1, but I'd have to run a much smaller cam to get a good DCR and I'm afraid it would lose a lot of top-end.
I looked at a few other cam choices and several of them will get me a lower DCR, but I'm sure there is more to this than just DCR.
If I went wish -10cc Dish pistons instead of -2cc, my SCR drops to around 11.28:1, but I'd have to run a much smaller cam to get a good DCR and I'm afraid it would lose a lot of top-end.
