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Old 10-18-2017, 10:08 AM   #1
Pollock
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What compression ratio are you running? looking to rebuild.

So far the two shops I contacted want to rebuild my or replace my engine with a 417 CI and drop the compression to 9.1.

I really love the sound of high compression at idle. I also am totally happy with what I have now. Is there any real reason why I cant just get my same 6.2L set up but in a forged version. Or is dropping the compression necessary.

I plan on tracking the car. Maybe 1 or 2 times a year.
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Old 10-18-2017, 10:29 AM   #2
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Old 10-18-2017, 03:18 PM   #3
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Iron 370 9.5:1 cr
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Old 10-18-2017, 03:54 PM   #4
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I'd do high compression
only reason id advice against it is if you don't want to run 93/meth/e85

I'm running twins on 11.1 compression no problem
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Old 10-18-2017, 03:57 PM   #5
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Quote:
Originally Posted by CGbambam View Post
I'd do high compression
only reason id advice against it is if you don't want to run 93/meth/e85

I'm running twins on 11.1 compression no problem
I was planning on sticking with 93 octane.
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Old 10-18-2017, 04:13 PM   #6
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Quote:
Originally Posted by Pollock View Post
I was planning on sticking with 93 octane.
depending on how much boost you want to run you'd might need some meth, you might ping without it
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Old 10-18-2017, 05:26 PM   #7
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10.5:1 with iron block, E85 and meth
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Old 10-18-2017, 07:33 PM   #8
Pollock
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I will be happy with 8 psi.
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Old 10-18-2017, 08:53 PM   #9
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Quote:
Originally Posted by Pollock View Post
I will be happy with 8 psi.
10.25:1
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Old 10-18-2017, 09:24 PM   #10
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If you’re not going E85...stay in the 9-10:1 range. If you are going to do E85...then you’d be smart to be in the 10.5-11:1 range.

There’s a good highly technical article out there somewhere that explores what’s better...more compression and lower boost...or lower compression and higher boost. The conclusion of it is that your always better lowering compression and turning up the boost. Some argue that’s old school and that these new engines and heads are so efficient that you can up the compression. But most people also want E85 too.

Fun topic to research. Tough to answer. I’m contemplating the same thing.
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Old 10-19-2017, 10:25 AM   #11
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So let me get this right you're running a stock 6.2 stock compression on 8 psi with a maggy right now?
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Old 10-19-2017, 11:07 AM   #12
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Quote:
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I will be happy with 8 psi.
LOL, famous last words!
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Old 10-19-2017, 03:33 PM   #13
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408 stroker 10 rib supercharged maggie at 10.1
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Old 10-19-2017, 08:23 PM   #14
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