could an m20.......?

[HairyScreech]

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.

[bss325i]

M30 cam pulley?

[HairyScreech]

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

[320Touring]

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

[gcs325i]

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.


http://www.e30zone.net/modules.php?name ... mp&start=0

[e301988325i]

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

[HairyScreech]

^^^ 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.

[DmcL]

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.

[bss325i]

You need a pressurised oil feed to the tensioner.

[HairyScreech]

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