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01-02-2014, 01:18 PM
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#1 |
 Drives: A White Car Join Date: Dec 2012
Location: Canada
Posts: 342
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Head Gasket Thickness Effect On Compression ??
I've looked around a bit but cannot really find a definitive answer, so I was looking at getting a slightly thicker head gasket and it was advertised that it would lower the compression ratio by ~1 just so I could run boost more safely, except I don't understand why this would drop the compression. I was told that it slightly increased the combustion chamber volume, except everywhere I have seen said that milling your heads, which also increases CC volume increases your compression. Could someone explain this to me? I'm so lost when it comes to this! Thank you in advance!
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"From ABS shudder that came on surprisingly early in the lousy brake pedal's travel to a looser rear end than Kim Kardashian"
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01-02-2014, 01:29 PM
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#2 |
           
Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012
Location: Vance Alabama
Posts: 8,021
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Milling the heads decrease the CC size of the chamber. Adding a thicker gasket doesn't increase the chamber size but increases the area the a/f is when compressed and in return lowers compression.
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Retired wanna be cylinder head porter
2015 2SS 1LE Clutch reservoir, Vararam DRX, ported TB, TSP 2" headers, MGW shifter Totalled: 2010 1SS Wilkes Performance/Eagle 416 shortblock, TSP custom valvetrain, PRC 260 heads, Edelbrock Pro Flo 102, th400 swap, 8" PTC 5500 stall= 535/435 at the wheels tuned Gen 3 Performance and Dyno 10.97 @ 124 full weight in 3100 DA CamaroFest X |
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01-02-2014, 01:59 PM
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#3 | |
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Drives: A White Car Join Date: Dec 2012
Location: Canada
Posts: 342
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Quote:
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"From ABS shudder that came on surprisingly early in the lousy brake pedal's travel to a looser rear end than Kim Kardashian"
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01-02-2014, 02:39 PM
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#4 |
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V8 Lounge member #2
Drives: 2001 Ws6 Join Date: Sep 2009
Location: Burbank,IL
Posts: 6,373
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No such thing. It's a good question to ask!
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2001 ws6, 40k miles, Ls3 416 stroker, short block built by PER the rest by me. LPE Ls3 heads milled to 12-1 comp, FAST 102, NW 102, kooks 2", dual DMH cutouts, Magnaflow C/B, BTR cam + springs. Full UMI suspension.
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01-02-2014, 03:20 PM
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#5 |
Drives: 12 camaro ss, 72 chevelle, 91camaro Join Date: Dec 2013
Location: findlay,oh
Posts: 2,069
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It will ruin your quench running a thicker head gasket. Its not as important on a fi motor as an n/a or nitrous motor, but still. And i think its every .1 thickness is 1 point of compression
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01-02-2014, 05:12 PM
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#6 |
Drives: 2009 ZR1 Join Date: May 2010
Location: KCMO
Posts: 3,205
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01-03-2014, 11:43 AM
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#7 |
Drives: 2012 2SS/RS M6 Join Date: Jul 2011
Location: Metro Detroit
Posts: 696
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The equation to calculation compression ratio is:
CR = Volume of chamber when piston is at BDC / Volume of chamber when piston is at TDC Spacing the head further from the deck will increase the volume for both the numerator and denominator of this equation by the same amount, which will reduce the compression ratio |
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| Tags |
| compression, confused, head gasket |
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