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September 24th, 2007, 09:25 PM
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#1 |
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Enthusiast
2003 Mach 1
12.7@107
Join Date: Dec 2006
Location: East Tennessee
Posts: 819
 iTrader: 1 reviews
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Compression Ratio
Is a lower or higher compression ratio better? And what can you do to change your ratio? Also one of my friends has a 2002 GT and said he was going to turbo it but said the ratio wasn't good for it and that a s/c would work with it better. But i herad the new GT's do work well with turbos... hell Idk
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September 24th, 2007, 09:26 PM
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#2 |
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Doc
 
1986 SVO
48.47@ 12.58
Join Date: Nov 2006
Posts: 37,050
 iTrader: 11 reviews
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lower is better for boost
higher is better for NA or nitrous.
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September 24th, 2007, 09:29 PM
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#3 |
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Enthusiast
2003 Mach 1
12.7@107
Join Date: Dec 2006
Location: East Tennessee
Posts: 819
iTrader: 1 reviews
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putting a stroker kit on a car would change the ratio right?
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2003 Azure Blue Mach 1 5-Speed BBK LTs, o/r X-Pipe,FRPP 4.30 Gears, MGW Shifter, JLT Ram Air, AJE K-member, Eibach Sportline Springs, Moroso Wet Sump Street/Strip Oil Pan, Nitto 555Rs, Steeda Clutch Adjuster, SCT X-Cal 3, NGK TR55ix Plugs |
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September 24th, 2007, 10:53 PM
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#4 |
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Regular
2007 Mustang GT, 66 Coupe
Join Date: May 2007
Location: Minneapolis, MN
Posts: 125
iTrader: 0 reviews
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I may be wrong on this. But I am learning a ton by tuning up my new '66 mustang with my Son.
The compression ratio is a function of the bottom to top stroke length of the crankshaft / connecting rod / piston head top surface to the remaining headspace in the cylinder head with valves closed. The only way to change the compression is to play with the headspace by adding / subtracting metal from the piston face, length from the connecting rod, stroke in the crankshaft or remaining space in the head. My understanding is that the greater the compression ratio the greater the potential energy in the compressed cylinder. This energy can be optimized within limits by adjusting the engine timing. This is probably basic info but should be fundamentally sound. Hope it helps! John
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Vista Blue 2007 Mustang GT Premium Coupe 5 Speed FRPP GTA Axelbacks, AMSOIL XL 5W-20 Steeda CAI w/ High Flow Elbow, SCT xCalibrator 2 
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September 24th, 2007, 11:01 PM
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#5 |
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Enthusiast
1991 LX, 2003 SNK, 2007 S
11.3
Join Date: Dec 2006
Location: Oklahoma City
Posts: 955
iTrader: 0 reviews
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Yes john you are correct you can change heads piston or some times gasket to change your compresion and for boost 9:1
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