I am just trying to see if it is going to be a big deal that my new solid roller 383 is 10.5:1/8.6:1 compression ratio.

If it is a no-no, then I guess I can always get my heads milled to gain compression.

So what do you guys think

 

If staying NA or with small nitrous hits I'd go with the higher compression for more NA hp. If your going to run a blower or huge shots of nitrous, the lower compression will allow you to run more boost or spray without detonation.

 

 

So static CR is 10.5:1 and dynamic is 8.6:1? If thats right then I hear 9.0:1 DCR is about as high as you wanna go for a street motor running on 91 pump gas.

 

I havent had a problem with 10.5 in my 383 w/GM847

People are trying to catch me all the time.

 

Well, I am going to spray like a 300-350 shot through a NX direct port setup.

So with that being said, should I just stay where I am at, or mill the heads to pick up some compression?

Thanks

 

Nitrous likes higher compression. I'd be more concerned about your ring gaps than compression ratio when running nitrous.

 

I'd stay where youre at. The extra cylender pressure will make it less tolorant, you'll need higher octane fuel either way.

But with higher compression you'll have to run less timing with the juice than you would be able to with the lower compression.

After a point youre just pushing it into the crankcase anyway.

 

Yeah, my engine builder took that into consideration. The rings are setup to handle a 400 shot.

I guess I am just going to leave it where it is.

 

texas, where did you get your engine built? Price? setup?

Im looking into building a 383 right now and trying to shop around, so far I think I have a very decent price but not sure about some if the parts, i'll get back to ya later with the details for comparison...

 

My 382 likes 10.4:1 with it's 233/239, but everyone can catch me because I do nothing but spin the tires 3/4 the way down the 1/4 mile

I need traction, BADLY

 

seems like you have a small cam in there, being that its only 10.5 with a DCR of 8.6.

 

Yeah, I just wanted to go with a solid roller that I know has performed really well before. I figure also, with the big shot I plan on spraying, that should make up for any power loss with the lower compression ratio.

 

If the SR is of ANY size,I think your figures are off.
Either you have more than 10.5 or less than 8.6. I can't see a 8.6DC with a 10.5SC and a mechanical roller. Ya might want to refigure your DC using the advertised IVC number,not the @.050.

 

I agree with LR.
I'm running 11.6 static and 8.3 dynamic with only 230 @ .050.

Dean