320/6 engine rebuild with M20B23 block

For all your questions, problems and DIY stories
Post Reply
User avatar
danielv_81
Newbee
Posts: 1
Joined: Wed Jan 13, 2021 11:06 pm
My E21(s): 82 320/6 manual

320/6 engine rebuild with M20B23 block

Post by danielv_81 »

Hello everyone, need your feedback,

I have an 82 320/6 with an original 250.000 km. It’s time for a rebuild and I have access to a M20B23 block, cylinders and crankshaft in great condition. I want to do the rebuild using this block, keeping the original carb. Does the cooling system need an upgrade? Is it viable to keep the 320/6 exhaust? What else do I have to keep in mind doing this upgrade?

¡Thanks for your help!


:bmw
User avatar
uwbuurman
E21 VIP
E21 VIP
Posts: 16828
Joined: Fri Jun 12, 2009 4:49 pm
My E21(s): 1978 type 1 323i 5speed dogleg Polaris
Location: Ljouwert

Re: 320/6 engine rebuild with M20B23 block

Post by uwbuurman »

No, straight swap. Nothing to it. Use the right head, and swap the shaft that drives the manual petrol pump in the b20 in stead of the ignition on the b23.
It's the man next door!

1978 BMW 323i
1980 BMW 528i maior restitutio
1987 BMW 325iA cabriolet
2006 BMW 320d touring High Executive
2015 BMW 320dA touring xDrive High Executive ///Msport
User avatar
BertjeConti
E21 Mad
Posts: 2285
Joined: Mon Nov 04, 2013 9:49 pm
My E21(s): E12 520-6
Location: nederland , Weert

Re: 320/6 engine rebuild with M20B23 block

Post by BertjeConti »

I hope your M20b23 comes with good pistons, they're not interchangable.
Image
Megasquirted '77 E12 520-6

Aspen Silver '96 E39 523i
User avatar
uwbuurman
E21 VIP
E21 VIP
Posts: 16828
Joined: Fri Jun 12, 2009 4:49 pm
My E21(s): 1978 type 1 323i 5speed dogleg Polaris
Location: Ljouwert

Re: 320/6 engine rebuild with M20B23 block

Post by uwbuurman »

As far as I understand, it is dropping the old block and using a complete 2.3 block combined with b20 head and carb and all other parts. Rob is right on using pistons etc from one lower end in the other.
It's the man next door!

1978 BMW 323i
1980 BMW 528i maior restitutio
1987 BMW 325iA cabriolet
2006 BMW 320d touring High Executive
2015 BMW 320dA touring xDrive High Executive ///Msport
Post Reply