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Doc99SS · 07-02-2009, 03:51 PM

I have a 402 from Texas-Speed with -10cc pistons and 64cc chambers.

How much "down in the hole" is the piston at TDC, and how much volume would that displace? Lets call this Vdh.

Also, I need the volume of the head gasket. Lets call this Vhg. I do not recall the thickness.

So far I have:

CR = [825 + 10 + 64] / [10 + 64] = 12.15 which is way to high.

However, I need the following:

CR = [825 + 10 + 64 + Vdh + Vhg] / [10 + 64 + Vdh + Vhg] to accurately calculate the static compression ratio.

07-02-2009, 03:51 PM	#1
Doc99SS TECH Regular Trader Rating: 2 Join Date: Nov 2001 Location: Mims, Florida Posts: 428	What is my compression ratio (static)? I have a 402 from Texas-Speed with -10cc pistons and 64cc chambers. How much "down in the hole" is the piston at TDC, and how much volume would that displace? Lets call this Vdh. Also, I need the volume of the head gasket. Lets call this Vhg. I do not recall the thickness. So far I have: CR = [825 + 10 + 64] / [10 + 64] = 12.15 which is way to high. However, I need the following: CR = [825 + 10 + 64 + Vdh + Vhg] / [10 + 64 + Vdh + Vhg] to accurately calculate the static compression ratio. __________________ '99 Camaro SS, LS2 402, Patriot Perf stage 3 heads, 244/248 .62" lift 112 LSA CC cam, 40#/hr FAST injectors, 1 3/4" FLP headers, Borla catback, 75mm MMS ported TB, LS1 Motorsports airlid, 92mm FAST intake, 100mm MAF, 95mm TB, CC 921 valve springs, 1.85 roller rockers, 410 gears, Pro 5.0 shifter.