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Location:
Adelaide
Registered:
April 2003
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 Re: 3t crank into 2tg
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Sun, 04 May 2003 06:00
 
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OK then I have done this conversion. The conversion itself is very straight forward assuming you have the correct engine.
As one of the others said there is a difference between early and late 2tg engines. The difference is this the early engine that is marked as a 2TG and came with the twin solex carbs is a celica 2T block with the twin cam Yamaha head on it on this engine the 3T crank will hit on the inside webbing of the block because the counter weights are a lot bigger than on the 2T crank. The later engine which is marked as a 2TG-EU that came with factory EFI and Electronic ignition is actually the same block as used on the T-18 3T motor, so if you have this engine then the 3T crank will literally bolt straight into the engine.
Having said this as the other guy said there is not enough clearance between the pistons and the valves using the standard cams and timing and the do hit together as i found out when I bolted mine together. So you can either use after market pistons that are reccesd to suit the valves or you can get the standard pistons machined for clearance or if you are on a tight budget like I was you can change the position of the drive dowel in the drive sprocket of the exhaust cam so that the exhaust valves close marginally sooner which should give you enough of a chance to make them clear the pistons. When I did this it worked and the power reduction was insignificant compared to the power increase from doing the 3T conversion if you need any more help email me at chris108@optusnet.com.au
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