E30 Zone

could an m20 be converted from belt to duplex chain drive?

not really thinking about actually doing it, but have been toying with the idea just for funsies.

i think it should be possible, using an m50 crank pully, a shortened m50 chain and tensioner, some kind of modified cam pully and scratch building a chain box.

M30 cam pulley?

good thinking, im tempted to mock it up, "just to see".

Biggest issue would be creating a tensioning system and a lubrication system..

Was Alex/Turbo-Brown not looking in to chain driven m20 for his twin turbo build? It may have been just the dry sump oil pump drive but may be worth a read.


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Sufficient lubrication could probably be provided by removing the crank and camshaft (edit added) oil seals, seems like an interesting prroject!

^^^ thats what i was thinking, no front main and have it in the stock m50 position. (hence the need for the 2.8 oil spacer)

im not really thinking of doing it, but i might mock it up just to see.

what about a change in the rocker spray bar setup? make a longer spray bar and run it out over the chain/cam sprocket with an additional spray hole.

You need a pressurised oil feed to the tensioner.

thats easy, external take of from a t-piece on the main oil gallery, like you would with a turbo feed.