can you combine a m52 and m50 for better

[Rockinlittle325i]

I'm getting a m52 crank in block, and I should be getting a complete m50 Vanos very soon,
I was wondering if I could combine the two to do something like the m20 eta stroker or the m20 eta low comp,

Thanks guys

[FredK]

Yes. It will bolt right on. The head castings are the same.

[VinniE30]

What would be the point of that?
How is that any better than a regular M52, except for the cams?

[Rockinlittle325i]

I mean, are the cams in the m50 any different from the m52? if so how?
what about the pistons? if so how?
if I used the entire m50 engine and its parts with the m52 crank would it be better than the stock m52?

I'm just trying to avoid building a m52 when I have a m50 that I could use parts from and make a better motor, or a better boostable motor.

thanks again

[Adrian_Visser]

You should do some searching Re:m50 stroker/frankenstein m50.

Pistons are different, cranks are different, rods are the same. Cam trays are different, cams are different although I don't think very different performance wise. IMO there isn't a lot you can do to magically make a hotter engine out of the two. Using an m54/s52 crank is about the only upgrade you can do, this nets you 3.0L and lots of meat between cylinders.

[SwiftE30]

I mean, are the cams in the m50 any different from the m52? if so how?
what about the pistons? if so how?
if I used the entire m50 engine and its parts with the m52 crank would it be better than the stock m52?

I'm just trying to avoid building a m52 when I have a m50 that I could use parts from and make a better motor, or a better boostable motor.

thanks again

wouldnt the best option be using the m52 and just put s52 cams in it. That seems to be a desirable setup. Why do you want to use the m50 so bad?

[Rockinlittle325i]

The m50 because I have one just sitting,

So the m50 head and pistons with the m52 would be 3.0? And not 2.8?

What would the compression ratio be?
How are the pistons different?

[VinniE30]

The m50 because I have one just sitting,

So the m50 head and pistons with the m52 would be 3.0? And not 2.8?

What would the compression ratio be?
How are the pistons different?

No. The m50 has a shorter stroke.
You can't combine an M50 and an M52 heads or blocks or parts in any way to get more displacement than a stock M52.
Basically your best bet would be to just use the M52 and sell the M50.

[SwiftE30]

^^Yup Yup

[Rockinlittle325i]

OK I see, here is what I have,
I have the m52 block in crank, and a complete m50
Could I put the m52 crank in the m50? If so what effect in displacement would I have, and compression ratio?

Either way ill build the m52 regardless,

[SwiftE30]

dude.... read VinniE30's post

You can't combine an M50 and an M52 heads or blocks or parts in any way

[mentaleeill]

No. The m50 pistons have a smaller diameter, for a smaller bore. It also has a shorter stroke.
You can't combine an M50 and an M52 heads or blocks or parts in any way to get more displacement than a stock M52.
Basically your best bet would be to just use the M52 and sell the M50.

m50 and m52 both share the same 84mm bore. the m52 crank has a longer stroke then the m50, but both share the same rod length, the difference between the crank stroke is made up in the pin height in the pistons. if you were to bolt the m52 crank in the m50 block, it would raise the height of the piston at tdc, increasing compression. i dont know how piston to valve clearances would be but i believe people have done it using custom size mls's for a slight bump in comp.

[Rockinlittle325i]

ok so here is the million dollar question,
what parts can I use to COMPLETE the m52?

here is what I have, a M52 block with crank, anothing else
and a complete m50 with vanos


if I could use the m50 to fully complete the m52, it would be alot cheaper than buying everything.

(of course I'm buying bearings, and rings and such, I'm just asking about main components)

[Bimmerguy91]

Take the M50 put the M52 crank and rods in it and reuse the m50 pistons and head. This creates a high compression 2.8 M50 AKA the poor mans S50. 11.25 to 1 CR

[Roysneon]

Or put the M50 head on the M52 block and have an OBD1 M52.