What compression ratio do you recommend?
Thread Starter
Racer
Joined: Sep 2003
Posts: 260
Likes: 0
From: Indianapolis IN
What compression ratio do you recommend?
I'm shooting for the highest CR with 93 octane and 200hp progressive NOS kit (383ci + AFRs). I just need the heads to top off the combo, but haven't decided which chamber size to go with.
What CR would be best?
What CR would be best?
Le Mans Master
Joined: Feb 1999
Posts: 9,922
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
Re: What compression ratio do you recommend? (HC4-Vette)
If you are using a SRP piston, with I believe 12 cc dish, or 20 cc dish, shoot for 11to1. The chamber size is I believe 54cc. Go to SRP website, they have a chart with chambers and pistons sizes to give you a Compression ratio. SRP pistons are very good, and widely used pistons in stroker motors.
Thread Starter
Racer
Joined: Sep 2003
Posts: 260
Likes: 0
From: Indianapolis IN
Re: What compression ratio do you recommend? (steve40th)
I have the SRP flattops w/ 4 valve reliefs. I'm trying to figure out what's the highest CR I can run and not have to use racing gas when using the progressive 200 shot of N20.
Drifting
Joined: Feb 2002
Posts: 1,952
Likes: 2
From: Little Rock Arkansas
Re: What compression ratio do you recommend? (HC4-Vette)
If it's a pump gas motor you can run as much as you can get away with on it. Nitrous likes compression, my ex-race engine in my Deuce was 555" and 15:1 compression with a two-stage 500 shot! Now, on a street engine that runs on pump gas I would keep that figure around 11.00:1 or just slightly higher. You can run 100-125 shot like that but if you kick it up to a 150 shot or more I would highly recommend some VP Performance Unleaded (at 150) or some C12 or C16 leaded gas if you run more.
-Jeb
-Jeb
