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thetoyman75 Forums Junkie Club President I supported Toymods Location: Sydney Registered: May 2002	Re: Early/Bigport 2T?? Thu, 20 February 2003 04:42 Sorry Guys I actually can't give a definative answer on this one There are deffinatly 2 varietys of 2T head and even 2 designs of 2T valve cover. They have the Oil breather on the side on one and on the top on the other. I do not know when this change happened or if it coincides with the Change in Port size. I can help with the 2T v's 2T-B side of things. Both had the same size Valves and Cam but the compression ratio's were different, See the details below ! 2T, 2T-B Firing Order: 1-3-4-2 Ignition Timing: 2T 10 Degrees BTDC / 800rpm 2T-B 12 Degrees BTDC / 800rpm Compression ratio: 2T 8.5:1 2T-B 9.4:1 Bore and Stroke: 85.0 x 70.0 Valve Size: Intake - 41mm Exhaust - 36mm Cam Shaft: Lobe Height In 38.36 ~ 38.46 Lobe Height Ex 38.25 ~ 38.35 Cam Lift: In 6.39 Ex 6.42 Compression at 250 rpm: 2T Specified 163 or 170 Psi (Depending on publication) 2T Limit 128 Psi 2T-B Specified 170 or 182 Psi (Depending on publication) 2T-B Limit 142 Psi Difference Between each Cylinder: Less than 14 Psi Oh, Obviously the 2T-B also benefitted from Twin Carbs ! I'd be very interested to know when the port change occured and even see some head flow figures if anyone has looked into it. Its on my to do list but along way down ! Hope that helps. [Updated on: Thu, 20 February 2003 04:45] [Report message to a moderator]

	Subject	Poster	Date
	Early/Bigport 2T??	inferno	Tue, 18 February 2003 02:27
	Re: Early/Bigport 2T??	Classique71	Wed, 19 February 2003 10:46
	Re: Early/Bigport 2T??	Grega	Wed, 19 February 2003 11:45
	Re: Early/Bigport 2T??	Classique71	Wed, 19 February 2003 11:59
	Re: Early/Bigport 2T??	inferno	Wed, 19 February 2003 12:52
	Re: Early/Bigport 2T??	Classique71	Thu, 20 February 2003 05:44
	Re: Early/Bigport 2T??	Grega	Wed, 19 February 2003 21:56
	Re: Early/Bigport 2T??	Classique71	Thu, 20 February 2003 05:49
	Re: Early/Bigport 2T??	Grega	Wed, 19 February 2003 22:06
	Re: Early/Bigport 2T??	thetoyman75	Thu, 20 February 2003 04:42
	Re: Early/Bigport 2T??	Classique71	Thu, 20 February 2003 05:52
	Re: Early/Bigport 2T??	Grega	Thu, 20 February 2003 09:24
	Re: Early/Bigport 2T??	Classique71	Thu, 20 February 2003 09:44
	Re: Early/Bigport 2T??	thetoyman75	Tue, 24 June 2003 23:40
	Re: Early/Bigport 2T??	inferno	Wed, 25 June 2003 12:52

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