M50/M52 potential?

[Daf318is]

But it will go further with a 3.73?

It would appear so

[DanThe]

Sat-nav readouts for the next comparison

[bss325i]

My engine when it was in Bob's car - it couldn't quite make the limiter. Pretty close though! Obviously that photo was taken on the 'ring

I can achieve that speed in my sport.

[Jhonno]

My engine when it was in Bob's car - it couldn't quite make the limiter. Pretty close though! Obviously that photo was taken on the 'ring

I had that showing on the way to the 'Ring playing catch up.. Only thing is, I still had ~1.5k rpm to go and it was still pulling rather well

[DanThe]

Must have been a long road Barry

[Jhonno]

Must have been a long road Barry

[jaistanley]

I've not V-Maxed mine yet, it's in need of a bit of alignment.. Not the most stable chariot!

Not even looking forward to it, but it has to be done eh?

Oh and, 400bhp is more than 100bhp per litre in any of BMW's 6 potters.. on a 3 litre car it'd be 133.33333333 bhp per litre....

Jai

[bss325i]

Must have been a long road Barry

Not really. It pulls well at the top end.

[Dave_M3]

My engine when it was in Bob's car - it couldn't quite make the limiter. Pretty close though! Obviously that photo was taken on the 'ring

I can achieve that speed in my sport.

I can achieve that in my iS








Bloody optimistic 4 pot speedos!

[DanThe]

Can I take this opportunity to mention Dafs has an iS speedo

[E30BeemerLad]

Can I take this opportunity to mention Dafs has an iS speedo

But you're not understanding Dan, that pic was of the 2nd time around the clock

[Dave_M3]

Can I take this opportunity to mention Dafs has an iS speedo

But you're not understanding Dan, that pic was of the 2nd time around the clock

See, I told you... bloody optimistic iS speedos!

Just have to look at the rev counter and you know something isn't quite right for 300mph

[Barx325i]

the revs are also around the clock..

[Dave_M3]

the revs are also around the clock..

I don't think its one of these he has unfortunately...

[Daf318is]

Hate to piss on everyones parade... but those are 320 clocks

[ShakeyC]

100bhp per cylinder? Were not building dragsters you know

I know just making a point there is no need to splash money everywhere, reliability is more down to human error in building or using wrong parts and tuning mistakes than outright blaming standard parts upto this rule of thumb level. Uprating known failure items is one thing but to uprate all internals just because adding little bit more boost is unfortunate on your wallets.

Its a common missassumption if your doubling power your doubling strain on the engine infact could only adding as much as 20% as indicated by peak cylinder pressures, the power is gained because the burn is going on just a fraction longer not that its just simply a bigger bang.

[Dezzy]

Back on topic. I am building an M50B30. Basicly doing it by (deep intake of breath)

M50 block bored out to 86mm
M52 crank and rods
S50 pistons (custom little end bushes needed)
decked block 0.5mm
shrick cams (bob's old ones I believe)
lightened fly and uprated clutch
remapped m50 none vanos ecu

Thanks to an idea from Danthe along with plenty of advice parts and comp ratio calcs.

[Dave_M3]

What kind of power are the M50b30s making?

Fella I know is selling a B30 just after being built and gearbox at the moment.

[Dezzy]

Don't know of any others (think it's be done in America) done and running. Mine will be on the rollers next year so will update when in a done. Hoping for around 275 bhp or more would be nice but I mght be on gas.

[Dave_M3]

Think my mates engine is for sale at around 1600 or something. Didn't think they'd make 275+ even with the cams...

[Dezzy]

I may be wrong it's just a gestimation. We will know soon enough.
I will be happy with it in and running to be honest £1600 is cheep for a 3lt M50 I reckon. I have 1 bag in mine so far.

[Dave_M3]

Yeah, 1600 or 1700... might be worth sticking it up in the for-sale section here actually.

I put it up on e30owners but being Ireland...

People thought it was too expensive when they could pick up an S50 for the same money...
Of course the fact that the engine was fully rebuilt and ready to go in rather than an S50 needing another 1000 quids worth of an exhaust etc didn't come into it

[E30BeemerLad]

I may be wrong it's just a gestimation. We will know soon enough.
I will be happy with it in and running to be honest £1600 is cheep for a 3lt M50 I reckon. I have 1 bag in mine so far.

Come on mate, you're not talking to the missus here, you must have more than £1k in that engine?

[Dave_M3]

Just doing some research there and the Racing Dynamics B30s made 265bhp which were 3040cc

[Dezzy]

Ha ha quick add up might be more
200 bottom end
150 motor
100 bored out
60 pistons
40 decked
120 custom bushes
150 rings
200 shrich sticks
120 gasket set full motor
Bit late will add more as I remember

hasn't been mapped

[Dezzy]

Just doing some research there and the Racing Dynamics B30s made 265bhp which were 3040cc

Ball park will do anywhere round there is
Interesting how do they get that cc
Mine I'll be 2926 and 11.1cr

Lee just realized mate do you think I would be here telling the tail of my engine if the wife had any ideas what I was spending. No chance

[bss325i]

Back on topic. I am building an M50B30. Basicly doing it by (deep intake of breath)

M50 block bored out to 86mm
M52 crank and rods
S50 pistons (custom little end bushes needed)
decked block 0.5mm
shrick cams (bob's old ones I believe)
lightened fly and uprated clutch
remapped m50 none vanos ecu

Thanks to an idea from Danthe along with plenty of advice parts and comp ratio calcs.

Wouldn't it be easier to build an M52B30 using,

M52 head
M50 block
M54B30 crank, rods and pistons

[Dave_M3]

Yeah, I'm not too sure really how they did it...

Closest I can think of is 3.02 with S50b32 pistons and S50b30 crank and rods.


The M54 crank isn't a great fit for the M50 block though, is it?
Seems to ring a bell with Dan mentioning it somewhere.

[Dezzy]

Yeh
Would have been easier to buy a M3 Evo and just drive it but not what I wanted.
To be honest this thing has evolved from ne stage to the next. Didn't set out to build a crazy M50 but here we are

[Dezzy]

Yeah, I'm not too sure really how they did it...

Closest I can think of is 3.02 with S50b32 pistons and S50b30 crank and rods.


The M54 crank isn't a great fit for the M50 block though, is it?
Seems to ring a bell with Dan mentioning it somewhere.

Big ends on the s50 crank are miles too big to fit a M50 block I have the crank the pistons came from and the rods.
Dan has a M54 bottom ended M52 so if it goes in m52 it will go in M50 no?

[Dave_M3]

Ah yeah, knew there was one that was too big so getting it all mixed up

Looking for some S50 pistons myself at the moment but I only need 4

[wullie325i]

Wouldn't it be easier to build an M52B30 using,

M52 head
M50 block
M54B30 crank, rods and pistons.

can you use the m52 head on the m50 block one is vanos the other is not. would that not be an issue? or will it run the same still retaining the vanos unit?

[Dezzy]

Nice 86mm bores are where it's at my friend

[Dave_M3]

I'm actually looking for 86.4 ones if I can find some

[Dezzy]

Ahh S50 B32 Evo or a certain someone's alpina bonk would do.