Difference between M20 & M30 intake manifolds?

[genphreak]

Does anyone know the difference between an M20 and an M30 intake manifold? I wonder if it'd be possible to mod one of these to fit an M30. It seems hard to get el-cheap-o M30 manifolds, TCD's are near $600. Whereas one of these can be had for $150;
http://www.stockreco.com/bmwmanifoldyellow.jpg


Of couse you get what you pay for. I bet Tod's are way better. I'd still like to know the difference in mounting geometry though.

Many thanks in advance. :) Nick

[Rigmaster]

Not sure about the differences in M20/M30 intakes- I *think* the port spacing is different though. But that manifold in the pic you posted is not an M20 manifold- the 4 bolts per port make me think it's an M50/S50 type manifold......

Got details on that $150 M20 manifold you mentioned??


Bret.

[winfred]

thats a m50 exhaust manifold which is nothing like a m20 which is nothing like a m30

[Mr Project]

You'd have a heck of a time using that on the intake of any BMW engine, that's for sure.

Are you asking about exhaust manifolds for a turbo application?

[genphreak]

You'd have a heck of a time using that on the intake of any BMW engine, that's for sure.

Are you asking about exhaust manifolds for a turbo application?Duh!

I think I was drunk. Sorry!!!! :p arghhh!

I meant to ask:
How hard would it be to mod an M20 or M50 exhaust manifold like that one to fit on an M30!!!

I don't know about the port spacings, sizes or mounting holes... can't find any specs on them at all.

:) Nick

[genphreak]

Not sure about the differences in M20/M30 intakes- I *think* the port spacing is different though. But that manifold in the pic you posted is not an M20 manifold- the 4 bolts per port make me think it's an M50/S50 type manifold...... Got details on that $150 M20 manifold you mentioned?? Bret. They are all over eBay Bret. I reckon they are rough as but its very costly for me to ship anything from the US. If these POS's are out of SEAsia it might be feasible for my first pass at a turbo setup.

[icesoft]

This thread: http://forums.bimmerforums.com/forum/showthread.php?t=357298, post #5, states that bore spacings are different from M20 and M30 blocks, I would imagine that the exhaust and intake ports maintain the same spacing as the cylinder bores in order to keep port lengths equal from the valves to the flange.

So the answer to your question, is a very probable 'No'.

[genphreak]

This thread: http://forums.bimmerforums.com/forum/showthread.php?t=357298, post #5, states that bore spacings are different from M20 and M30 blocks, I would imagine that the exhaust and intake ports maintain the same spacing as the cylinder bores in order to keep port lengths equal from the valves to the flange.

So the answer to your question, is a very probable 'No'.Thanks for the info icesoft. It was a silly question I know. Sorry everyone :( maybe I was drunk!