View original topic: 1941cc motor
doorpz Sun Aug 31, 2003 2:18 am

just curious if anybody has this engine. i'm having one built for me now, its a 73 crank and 92 piston. the guy whos building it says it keeps the case stronger because you don't have to machine it for a 73mm crank. i'm going to run it with dual weber 44's.

[email protected] Tue Sep 02, 2003 12:43 pm

Have you already bought the 92mm's??? What kind of vehicle is the engine going into? 92's have pretty thin walls unless they are the thick wall kind (which are VERY expensive). I'd personally never use 92's. I'd stick with 90.5's or 94's.


doorpz Wed Sep 03, 2003 12:45 am

its going in a 74 bug. yeah i've bought the 92's already, but how are 92's worse than 94's? wouldn't 94's have an even thinner wall?

[email protected] Thu Sep 04, 2003 11:28 am

92's have thinner walls. a 92mm piston will slip into a case that has been opened up to 90.5mm. a 94mm piston has to have the case machined out specifically for that size. I don't know the exact thicknesses. Machine in 88mm are the thickest, then stock, then 90.5, then 94's then 92, 87's and slip in 88's are all about the same thickness. Make sure your cooling system is completely intact, with nothing missing. Overheating the engine will cause the cylinders to warp easier which could cause excessive blow-by. It's not uncommon to have to replace 92's after 40k-50k miles if they are being used on a full body bug.


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