Author Topic: M42 with M47 Crank (Read 4472 times)

walts03 · « **on:** January 16, 2009, 06:26:11 AM »

Hi i am a newbie to this site.
i am in the uk and i have just got hold of a M47 Crank

I know what you can do with
M44 pistons (2.0l) and
S50 pistons (2.1l) but what displacement and compression ratio would the engine be with the standard m42 pistons and an m47 crank?

Thanks

rob_e30 · « **Reply #1 on:** January 16, 2009, 08:37:19 AM »

84mm pistons with an 88mm stroke is 1.95L

walts03 · « **Reply #2 on:** January 16, 2009, 10:06:38 AM »

Cool would i need new engine management system tho?

rob_e30 · « **Reply #3 on:** January 16, 2009, 05:32:08 PM »

I can't imagine that you would.

crazzy_hippo · « **Reply #4 on:** January 16, 2009, 08:53:02 PM »

Btw, take note that you will need to modify the crank (shorten the nose a little and additional notch for the woodruff key).

Also, you will have to deck the pistons.

walts03 · « **Reply #5 on:** January 17, 2009, 04:07:26 AM »

yeah will get the crank done and the deck height done. should be cool. thanks guys