what is the max compression ratio i can run on 87,91,93 octane on our 4.6 2v?

 

What exactly are your goals? Flat top pistons? Different heads?

 

I want to be in the 300 -350 hp at the crank but want to remain N/A.i was looking at this assemblies
http://www.modmaxracing.com/mobile/P...tCode=EAG16400
http://www.modmaxracing.com/mobile/P...tCode=99025246

 

I ran a flat top with valve reliefs in mine with cncd Chambers at 46cc I believe. It was 11.1 static ish. I could only run 17 degrees of timing. It begged for a e85 swap. I would keep it under or at 10:1. I would do the 17cc dish and never regret it a bit with today's gas. Hopefully you will have it tuned.

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I would have to agree with LX, whatever you have planned a custom tune should be a priority.

 

Factory was 9.0:1 ratio in 97, then it went up a bit in 2000 with the PI heads (Approx 9.3:1). The 3V's are 9.8:1, and I am pretty sure that much beyond 10:1, you're going to need flex fuel (E85) which is 105 octane, IIRC. Otherwise you'll probably do some ping-a-ping-ping. I also seem to remember seeing that a PI head swap onto a 97-99 makes a 10:1 ratio anyway. Maybe you should look into that, seeing as how you have a 97.

 

I feel like it would make sense to do the PI swap if you are digging into the motor anyways. Why leave the pre-pi heads and intake there to restrict air flow if you are dropping almost 2k on a rotating assembly?

 

I have a 2002

 

Oh, ok. I have you confused with someone else then. Sorry.

 

Sorry guys I should have pointed that before