Increasing Displacment of a M10B18

Discuss general engine, turbo and supercharger conversions in this section

Moderator: martauto

swrt
E30 Zone Newbie
E30 Zone Newbie
Posts: 43
Joined: Wed Aug 15, 2007 11:00 pm
Location: South Africa

Post Tue Oct 16, 2007 6:50 am

Hi guys I would like to know how to increase from a 1800cc to 2000cc on a M10 motor I know that 2002 parts can be used but we never got the 2002 in SA.

What other parts can be used and what to I need is it just the conrods or is it crank, conrod, piston combination.
swrt
E30 Zone Newbie
E30 Zone Newbie
Posts: 43
Joined: Wed Aug 15, 2007 11:00 pm
Location: South Africa

Post Tue Oct 16, 2007 9:54 am

Would M30 conrods increase the displacement or just the compression ratio
StuBeeDoo
Engaged to the E30 Zone
Engaged to the E30 Zone
Posts: 6756
Joined: Sat Feb 05, 2005 11:00 pm
Location: Up My Own Arse

Post Tue Oct 16, 2007 10:13 am

OK, I've done a bit digging for you.
M10B18 = 89mm bore/71mm stroke
M10B20 = 89mm bore/80mm stroke

What you'll need is M10B20 crankshaft and pistons. The rods are identical.
Don't know about RSA, but in Europe the M10B20 was used in 4-cyl. E21 320's (but, IIRC, not 320i's).

HTH
Stuart.
This is why I no longer drive an E30......

Image
swrt
E30 Zone Newbie
E30 Zone Newbie
Posts: 43
Joined: Wed Aug 15, 2007 11:00 pm
Location: South Africa

Post Tue Oct 16, 2007 11:39 am

Thanx alot man i will scearch for the parts
StuBeeDoo
Engaged to the E30 Zone
Engaged to the E30 Zone
Posts: 6756
Joined: Sat Feb 05, 2005 11:00 pm
Location: Up My Own Arse

Post Tue Oct 16, 2007 12:09 pm

StuBeeDoo wrote:in Europe the M10B20 was used in 4-cyl. E21 320's (but, IIRC, not 320i's).
Sorry, duff info.
Up here, all 320's and 320i's were M10 until 08/78 when 320i was discontinued. M20B20 was introduced in carb version as "320/6" in 06/77, but ran in tandem with M10B20 carb. "320" until M10B20 carb engine discontinued in 07/79.
Clear as muddy water?? Yup, same here! :lol:
This is why I no longer drive an E30......

Image