243 Head cc ?
Thread Starter
Staging Lane
Joined: Oct 2006
Posts: 67
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243 Head cc ? I just bought a set of the Patriot 243 ported heads which I am haveing milled down to 62cc chambers.I will be useing the tr224 cam with lt headers.This will not be to much compression for 94 octane fuel will it?I have time to change on the milling.Gunnar told me they will not ship for about 2 weeks.
Thanks
Thanks
I think stock 243 heads are 64cc. And it depends on how much you want them milled. I am going to have mine milled about.020 Hopefully that will bring them down below 62cc. And bump up the compression for low end. And as far as 94 octane, that is more than plenty..
lane
lane
Last edited by crazylane; Jan 3, 2007 at 06:28 AM.
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I had mine milled .030". Actually after the mill, my tuner measured the deck thickness and said he thinks they're milled .040". So somewhere in there.
As for PTV... depends on your cam. I flycut so it is more drivable.
As for PTV... depends on your cam. I flycut so it is more drivable.
Originally Posted by N4cer
I had mine milled .030". Actually after the mill, my tuner measured the deck thickness and said he thinks they're milled .040". So somewhere in there.
As for PTV... depends on your cam. I flycut so it is more drivable.
As for PTV... depends on your cam. I flycut so it is more drivable.
im not trying to be a *****, but what does flycuting have to do with drivability??? Is there something I am missing?
lane
Oh okay, see I know all of that, but I guess I just took what you said in a wrong way. lmao. Im sorry, Like I said I was not trying to be a *****. just wondering what you mint.
lane
lane
TECH Apprentice
Joined: Sep 2005
Posts: 334
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Originally Posted by Greed4Speed
Doesn't Patriot cut chamber sizes to your specs? If so, just get a smaller chamber instead of milling.
The Patriot heads refered to in this thread start off with OEM LS6/LS2 243 castings. These have unwelded chambers that are just under 65cc (which is about 2cc smaller than the stock LS1 chambers). They need to be decked if you want to get the the CC volumes down even lower; Patriot will deck them to your desired specs for no additional cost.
Last edited by RAACCR; Jan 10, 2007 at 09:45 PM.
Originally Posted by Proud2bSS
What is your mean above sea level altitude?
This will influence your final CR.....
This will influence your final CR.....
Originally Posted by cenman
Has anyone had their 243s milled down to 60cc? Will that take too much off? Any issues with 93 octane or valve clearance?
The 243 is a 64.45cc combustion chamber. As for valve clearance, be aware aftermarket valves will kill ur PTV clearance. I'm right within spec with a 224/224 cam, 2.02/1.57, .045 gasket and I milled them .010" Be prepared to flycut if you go more aggresive than that.
Originally Posted by N4cer
How is that? A compression ratio is a compression ratio. Fractions don't change by location.
Given the same stroke, a 64cc chamber facilitates more chamber pressure than a 70cc chamber due to the same volume of air being compressed in a smaller space. However, as you gain in altitude, you lose air density. In a naturally aspirated motor, this means there is less total available air to compress into the chamber, thus less available power produced.
You will also see that forced induction motors see this same affect between sea level and higher altitudes.
Dude, it's still the same compression. You're still compressing what started in the chamber down to 1/8.5th its original size, regardless of density. 1/4th a quart of alcohol is the same volume as 1/4th a quart of motor oil.