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Jonny2TG Forums Junkie Location: Tasmania Registered: May 2002	Re: compression depression Sat, 31 August 2002 15:33 Why not do the math? You passed grade 6 right? You can calulate the volume of a cylinder, understand ratios, convert different units? The 3T head chamber is 68cc I am told. The 2TG head chamber is 62cc. Assume the compression ratio of a 3T-C is 9:1. The swept volume of one cylinder of a 3T motor is: 78 x (pie x 85^2) / (4 x 1000) = 442.6cc For a 3T-C motor: compression ratio 9/1 = (442.6 + 68 - piston top) / (68 - piston top) Therefore, the piston top area is about 18cc or something like that. Compression for 3T-G motor: Compression ratio = (442.6 + 62 - 1 / (62 - 1 = 11:1 This is not the real result, because I made up a few of those numbers. Work it out properly, but also calcutate for a 1mm head gaskit, and you will find that the result is actualy about 10:1. The higher the better I guess. Also remember you will be taking some material off the piston for the exhaust valve clearance. Its best to measure your combustion chambers yourself, with oil or clay or something. Don't just reley on figures floating around the internet. 10.5:1 is more like what you will end up with if going with aftermarket 89mm forged pistons. [Report message to a moderator]

	Subject	Poster	Date
	compression depression	BigBadBenny	Thu, 29 August 2002 09:08
	Re: compression depression	Karl_skewes	Thu, 29 August 2002 11:01
	Re: compression depression	BigBadBenny	Sat, 31 August 2002 03:02
	Re: compression depression	Jonny2TG	Sat, 31 August 2002 15:33
	Re: compression depression	BigBadBenny	Mon, 02 September 2002 09:09
	Re: compression depression	BigBadBenny	Tue, 03 September 2002 10:24
	Re: compression depression	Karl_skewes	Tue, 03 September 2002 10:32
	Re: compression depression	Jonny2TG	Mon, 02 September 2002 11:31
	Re: compression depression	Jonny2TG	Tue, 03 September 2002 11:12
	Re: compression depression	BigBadBenny	Wed, 04 September 2002 08:58
	Re: compression depression	Jonny2TG	Wed, 04 September 2002 15:28
	Re: compression depression	BigBadBenny	Wed, 04 September 2002 21:06
	Re: compression depression	goonman86	Fri, 15 April 2005 12:44
	Re: compression depression	Jonny2TG	Sun, 17 April 2005 00:53
	Re: compression depression	goonman86	Sun, 17 April 2005 02:12

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