Which BMW engines had a chain driven oil pump?

[Turbo-Brown]

In an attempt to make my project as complicated as possible, I'm looking into converting the M20 to chain driven cam and ditching the spindly spindle driven oil pump in favor of a (preferably) higher capacity chain driven pump.

Obviously this is going to involve the creation of a whole new front cover assembly to allow for lubrication of the chain and, for chain drive to find its way into the sump, the making of a new sump.

At the back of my mind is the thought that I could take things to their logical conclusion and make a dry-sump system which is something I've not been keen on previously as I'm not keen on having such a vital system being driven by an exposed rubber belt. However, if I was going to the trouble of chain drive, I could house the pumps in the sump and eliminate the worry.

Wandering off my own topic, I quite like the idea of a pre-lube system where an electric pump primes the oil system before start up.

[e30_Turbo]

Alex,

If you go that far could you not utulise the M50 head? the chain/belt issue it the main difference and I've been told the blocks are the same....

It's something I asked about years ago but no-one was mad enough to try it.....until now

[Toby_Unna]

m50 crank might be a start anyway, or perhaps an m52 b28 one

m30 has the pump sitting underneath the cam chain drive, with a sprocket driven by a short chain that runs adjacent to the cam chain

this does seem like a bizarre idea Alex

[e30_Turbo]

Hey Toby

[Toby_Unna]

Hi Mark have you risen above the depths of 9psi yet

[Andyboy]

Alex,

If you go that far could you not utulise the M50 head? the chain/belt issue it the main difference and I've been told the blocks are the same....

It's something I asked about years ago but no-one was mad enough to try it.....until now

Blocks aren't the same - the M50 block has nowhere to bolt a water pump to.

Chain driven oil pump - you clearly don't have enough to do.........

[e21Jason]

Hi

The dry sump for my s14 is belt driven, some rally cars run a double pully set up so there is not a single point of failure.

I have an idea on the older blocks the dizzy is driven by the jack shaft. so cut the dizzy down and mount a large oil pump externally onto the end of the dizzy.

Also the exhuast water ways on the m50 over hang the m20 block, the head bolts up but it looks like a dry deck job to fit it.

Also have you looked at an acu-sump


Jason

[e30_Turbo]

Alex,

If you go that far could you not utulise the M50 head? the chain/belt issue it the main difference and I've been told the blocks are the same....

It's something I asked about years ago but no-one was mad enough to try it.....until now

Blocks aren't the same - the M50 block has nowhere to bolt a water pump to.

Chain driven oil pump - you clearly don't have enough to do.........

Is that the only difference then?

If so a remote water pump and your sorted.

Mark.

[Turbo-Brown]

Hmm, I'm guessing that the IE stroker kits have an M50 (or 52) crank so that's possibly part of the battle won.

Had a look on the Pace website and a suitable pump looks to cost around £500.

I'm not too worried about starvation as I don't drive particularly hard anyway, but having no oil to drag the internals down might help in my dyno-queen mission

The architecture's still there for the dizzy on the later blocks, there's not really all that much room to fit a big pump there though and also it'd be quite high up so a catch tank would need to be even higher....or such is my understanding.

[Simon13]

don't M60 V8's have a chain driven oil pump? just a thought

[Andy335Touring]

This is the M30 pump, i've got a spare one if you want one to play with ?

http://img465.imageshack.us/img465/4379/20d6ca1wu0.jpg

[mini rant]bloody imageshack is playing up again [/mini rant]

http://homepage.ntlworld.com/a.law47/op.JPG

[Andyboy]

Alex,

If you go that far could you not utulise the M50 head? the chain/belt issue it the main difference and I've been told the blocks are the same....

It's something I asked about years ago but no-one was mad enough to try it.....until now

Blocks aren't the same - the M50 block has nowhere to bolt a water pump to.

Chain driven oil pump - you clearly don't have enough to do.........

Is that the only difference then?

If so a remote water pump and your sorted.

Mark.

But why would you bother? There is no advantage at all - but you go ahead and lets us know when you've done it!

Also, how would you keep the engine oil in with no front cover? How would you get water into the block?

Or you could just use an M50 block, about £5 worth of scrap iron available anywhere. The only thing the blocks have in common is the bore and crank web spacing.

[Andyboy]

don't M60 V8's have a chain driven oil pump? just a thought

Yes - but where on an M20 crank would you mount the drive chain? That seems to be the elementary bit..................

[Ant]

there is the easy route to this Alex......

just fit an M50

M10 oil pump is compact enough to go in the space and chain driven, a stronger pencil drive seems the obvious soloution though

the M20 cranks dont run in the oil bath anyways dude,a scraper/windage tray would offer the same gains on this mill imho.

[e21Jason]

Hi

the m3 3.2 cranks foul the jack shaft and the crank nose is wrong for an m20 conversion, thats why the ie kits use the m52 crank. my mates using an s52 crank but as he can knockup prototype engines at work his m20 s in a different leauge 3.2 on kugllefischer throttle boddies.

The m50 head bolts up but none of the oil/water passeges line up.

Alex what you need is an dry sump m20 so it Time for TIG. My e21 race car is eligible to run a dry sump, but I have yet to find any suppliers. The only dry m20 sump i have seen is in my hartge e21 gruppe 2 pricelist which makes it rocking horse poo.

I have a few ideas on an m20 dry sump but the cost of a pump doubles the budget

Jason

[JazzMan]

m52 has a chain driven oil pump, took one to bits a few months ago

[Gunni]

Metric Mechanics in the US have available a higher capacity M20 pump, wich you could probably have somebody
make in the UK anyway.

The problem with the M20 pumps are the low pressures at low engine speeds,
with better gearing on them they would perform alot better and this is what the MM pumps are
doing,