Toymods Car Club Inc: Tech & Conversions => Toyot Celica Har Top 77 compression ratio??

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thechuckster
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Brisbane
Registered:
February 2003

Re: Toyot Celica Har Top 77 compression ratio??	Sat, 01 October 2005 23:50

henrick, main differences between 18r and 18RC is the anti-pollution gear like the air pump, EGR, some vacuum control stuff and fixed mixture-control carbi. the compression ratio is both is the same (they have same pistons, rods and crank) you can find more info here <http://www.geocities.com/MotorCity/Pit/9975/dataBy Subject/Engine.html> a handy site worth bookmarking however... the engine design (non-crossflow) makes it real complicated for turbo-ing - as you have to squeeze most of the hardware onto one side of the engine. like this: If you insisted on boosting one as-is. i'd suggest limited boost to about 4-5 psi. You would still have to do something with timing (e.g. overall less mechanical advance, higher static advance, curve modified ot bring advance up to full advance before significant boost occurs). You could also try to adapt the boost-retard-capable vacuum advance of a cordia turbo or other old-school turbo engine. Bad timing will make the motor ping and detonate - and this will kill it rapidly. i'd suggest one of the following for turbo-ing: 18RGUE, 3t-ge, 22RE - i think any of them would fit tho you'd have to look and think about which sump will fit into the '77 model. I'd stick to an existing EFI engine - my experience with carbi+turbo has been less than satisfactory. Also, am not sure if europe got any 1ggte's but they turn the humble 18R-powered celica into a rocket! see here for some pics of a convesion of RA28 from 18RGUE to 1GGTE cheers, Charles. [Report message to a moderator]

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