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M20b25 question

Posted: Thu Nov 18, 2021 5:35 pm
by bealo
Calling m20b25 guys…..

I have been reading through some threads regarding the m20b25 swap and can’t find a definitive answer to a couple of questions

1. In tank fuel pump: keep 320/6 pump or use 318is pump?

2. Swap sump and use original 320/6 sump?

3. Use e30 m20b25 starter? Does this work with the 320/6 flywheel?

4. Use 320/6 water pump? If so why?

5. Machine 320/6 manifold so ports marry up correctly or does this not matter?

Re: M20b25 question

Posted: Thu Nov 18, 2021 5:50 pm
by BertjeConti
What kind of swap do you have in mind?
Only block and head and use the solex 4A1 (bad idea) or including motronic injection system (much better)?

Carburettors need a low pressure fuelpump, injection system a high pressure pump.

Use the original 320/6 sump

Waterpump, doesn't matter as long as it is compatible with your fanclutch.

And use the m20b25 exhaust manifolds.

Re: M20b25 question

Posted: Thu Nov 18, 2021 7:18 pm
by bealo
Planning to put the whole engine in

I thought the m20b25 manifold fouls the steering column??

Re: M20b25 question

Posted: Thu Nov 18, 2021 8:12 pm
by BertjeConti
bealo wrote: Thu Nov 18, 2021 7:18 pm Planning to put the whole engine in

I thought the m20b25 manifold fouls the steering column??
Oh, its a rhd car then?

Re: M20b25 question

Posted: Thu Nov 18, 2021 9:37 pm
by bealo
Yes it is