10:1 Compression?

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Feb 20, 2011 | 12:46 PM

1evilss

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From: St.Charles, Missouri

10:1 Compression?

Hey guys im trying to figure out if im gonna be ok with a 10:1 CR on a 402 that gets 93 octane but may switch to e85 ......Also what kinda boost would I be able to run safely with 317 heads? Keep in mind this will be my street/weekend warrior....Car usually sees about 600 miles a summer

Feb 20, 2011 | 02:35 PM

TurboAv

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I say run it. E85 will allow more boost than 93 obviously. Stock heads can hold 15-20 psi with a good tune.

Feb 20, 2011 | 05:13 PM

1evilss

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So detonation wont be a problem?

Feb 20, 2011 | 05:26 PM

jay7199

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not with the proper tune.

Feb 20, 2011 | 05:29 PM

1evilss

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So my goal of 700rwhp is not unobtainable?

Feb 20, 2011 | 05:58 PM

TurboAv

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I don't know if you would get there on 93 without meth, but E85 would probably get you there.

Feb 20, 2011 | 06:30 PM

1evilss

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Ya e85 is sold less than a mile from my house so that's prob gonna be the fuel I run.....so with the e85 I should be fine with my build right?

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Feb 20, 2011 | 08:13 PM

Atomic

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My 408 was 11:1 compression and I ran at 7lbs with 93 pump gas, no issues, just a **** ton of torque.

Feb 20, 2011 | 08:17 PM

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1evilss

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What kinda power were u making?

Feb 20, 2011 | 10:38 PM

#11

99mongooSS

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i would think you could reach 700 safely...we built a car where i work with 10.25:1 and 15psi, it made 790rwhp/760rwtq on 93. Now the big secret behind that car was the tune was dead nuts...it had a fast xfi which is sequential making us able to dial in each cylinder. so having said that i could see you safely making 650 to 700 with a stock computer safely with a little less boost.

Feb 20, 2011 | 11:10 PM

#12

Atomic

I need a gauge for that

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From: Huntsville, AL

Quote:

Originally Posted by 1evilss

What kinda power were u making?

I never got the chance to take it to a dyno for other reasons, but based on track times it put down around 600hp. This was on a 6400lb truck with 35" 120lb tires, and a 14b axle, so I imagine it would have been closer to 675-700 on a m6 car.

Feb 22, 2011 | 12:16 PM

#13

1evilss

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I also been thinking about selling the stroker kit I have and just running like a boosted 370....Is there a reason more people run those than 400+ cubes

Feb 22, 2011 | 04:42 PM

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slowlsx

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From: Deer park

Quote:

Originally Posted by 1evilss

I also been thinking about selling the stroker kit I have and just running like a boosted 370....Is there a reason more people run those than 400+ cubes

thicker cylinder walls, small cubes will rev higher and turbo's love rpm.

Feb 24, 2011 | 12:38 AM

#15

1evilss

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So do you guys think its better to run a 370 or go ahead and finish my 402 boost build

Feb 24, 2011 | 12:44 AM

#16

Atomic

I need a gauge for that

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From: Huntsville, AL

Quote:

Originally Posted by slowlsx

thicker cylinder walls, small cubes will rev higher and turbo's love rpm.

a 370 and 408 have the same 4.030" bore...

Feb 24, 2011 | 07:47 AM

#17

TurboAv

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From: Tonopah, AZ

I would run the stroker just for the better crank. Yes I know people have had stocker cranks over 1000, but I would be more comfortable with a good crank.

Feb 24, 2011 | 11:31 AM

#18

Rickys S/C Z28

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From: MOREHEAD KY

i have a 10.2.1 347 made 650 with a stalled 4l80 on pump gas so 700 with the big cubes should be easy

Feb 24, 2011 | 11:39 AM

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Bob@BruteSpeed

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http://www.exoticperformanceplus.com...Car.php?car=39

Check out this APS twin turbo build that we did back at the old shop that is no longer open. Your compression ratio will be just fine. Bob

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Feb 24, 2011 | 06:17 PM

#20

1evilss

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Thats what I like to hear guys....I was worried my compression would be to high to run a good amount of boost

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10:1 Compression?

10:1 Compression?

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