M42club.com - Home of the BMW E30/E36 318i/iS

DISCUSSION => Swaps, Turbos, Buildups => Topic started by: walts03 on January 16, 2009, 06:26:11 AM

Title: M42 with M47 Crank
Post by: 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 :D

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

Title: M42 with M47 Crank
Post by: rob_e30 on January 16, 2009, 08:37:19 AM

84mm pistons with an 88mm stroke is 1.95L

Title: M42 with M47 Crank
Post by: walts03 on January 16, 2009, 10:06:38 AM

Cool would i need new engine management system tho?

Title: M42 with M47 Crank
Post by: rob_e30 on January 16, 2009, 05:32:08 PM

I can't imagine that you would.

Title: M42 with M47 Crank
Post by: crazzy_hippo 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.

Title: M42 with M47 Crank
Post by: walts03 on January 17, 2009, 04:07:26 AM

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