M50 Turbo Stroker Help

[balilu91]

Hi
im in the process of getting rid of my m42 & going for an m50..
Im supposed to be picking up an m50b20 next week.
My target is to stroke it to 2.8 or more and eventually turbo it.
Aiming maybe around 400ish bhp

I just have some questions:

1) What internals should i get to be strong enough and not end up with high CR? m52b28 or m54b30 or else?

2) I have found a post about this (saying theyre the same) but i want to make sure of it.. are the b20 and b25 blocks the same? meaning i can safely bore it to 84mm?

Thats about it for now.. Thanks for your help

P.S. before i get stones thrown at me reason i went for a b20 is because im not from the UK and here in Malta licence difference from b20 to b25 is about twice as much.. so i will be paying for a 2.0l engine when its actually 2.8+ hopefully

[ross_jsy]

An m50 will handle 500hp fine with nothing more than a thicker MLS head gasket and ARP head bolts.

Block is the same. Use pistons, rods and crank from an m52. Not a bad idea using the b20 block as it will have a fresh bore.

[DanThe]

Seems a lot of work just for an engine number, the head combustion chamber and valves are smaller also

[balilu91]

Seems a lot of work just for an engine number, the head combustion chamber and valves are smaller also

I thought the only difference was that the m50 head has 2 coolant temp sensor holes whilst the m52 has them combined in 1. is there alot of difference?

[DanThe]

Im on about the difference between M50B20 and M50B25

[balilu91]

hmm should i have any issues due to the head?

P.S. The m50b20 is a Non-Vanos

I think i can get a whole m52tub28 at a good price to use for crank/pistons/rods.

if the b20 head is an issue I can use the b28 head though i don't really wanna go into sorting dual-vanos with a stand alone managment

[ross_jsy]

Head won't fit. Could always get one off an m50b25 but as Dan said this is all a lot of effort. If I were you I would use an m50b25 with the mods I mentioned earlier. That will handle 500hp, more than your initial needs and spend the money you saved on not building a stroker on tax.

[balilu91]

Head won't fit.

The m52 head doesnt fit?

Could always get
one off an m50b25 but as Dan said this is all a lot of effort. If I were you I would use an m50b25 with the mods I mentioned earlier. That will handle 500hp, more than your initial needs and spend the money you saved on not building a stroker on tax

maybe i can give a clearer picture altough im not really sure how much road tax costs in the uk.

here road tax for a b25 is almost £490 annually whilst for the b20 its around £240.. thats about £1000 less in 4 years which means if i spend more money now.. in the long run it would be worth it atleast meh thinks.

cant i work with a b20 head? is it because the b20 head is made for 80mm bore? meaning this will result in higher compression?

[balilu91]

bump..

collecting the engine tomorrow

[DanThe]

cant i work with a b20 head? is it because the b20 head is made for 80mm bore? meaning this will result in higher compression?

Im sure the B20 has smaller valves and smaller combustion chamber, I will measure one tomorrow and compare to a B25 if I have time

[balilu91]

cant i work with a b20 head? is it because the b20 head is made for 80mm bore? meaning this will result in higher compression?

Im sure the B20 has smaller valves and smaller combustion chamber, I will measure one tomorrow and compare to a B25 if I have time

thanks for your effort mate. Im not in a hurry.. Thanks alot ;)

there arent any modified bimmers on the island (mainly japanese cars) and people i can ask so i have to rely on the forum.

most people just buy & drive a bmw here & some just put japanese engines in them

[DanThe]

some just put japanese engines in them

[balilu91]

found for sale crank/pistons/rods and an m50b25 head at a good price..

but the head is a vanos head and has no cams. would it be an issue if just use my cams on the head since mine are non vanos? and i would prefer it without vanos (less things to worry about )

[Gunni]

M50B28 non vanos power figures.

[balilu91]

M50B28 non vanos power figures.

ive seen some of your threads and theres alot of info there and nice monster machines youre making

any update on the b20 vs b25 head danthe?

[balilu91]

Ive got crank and pistons from an m52b28 on the way






i will be using a mls .140 gasket and arp head bolts.

should i use arp bolts for flywheel and rods too?

this should get me a good turbo solid engine right?

[Gunni]

Unless you plan on 8k rpm + Then you don´t need ARP for rods or flywheel.
Lots of people are doing great below 8k rpm without those.

[balilu91]

Small Update...

Recieved Cranks/Rods/Pistons
Dismantled whole Engine

My current idea of the Finished Engine

Non Vanos
M50B20 Bored to 84mm
B28 crank/rods/pistons
MLS .140" Gasket
ARP Head & Rod Bolts
ACL Race series Bearings (All)
New Gaskets/Seals/Piston rings (All)

Balancing of crank with M20 Flywheel
Sachs 618 Pressure Plate
6 Pad clutch

Front Mounted Big Intercooler
Oil cooler
Custom Turbo Manifold

Still not sure about turbo size (?) and injectors (600cc?)

as for ecu im trying to look into getting an AEM. my mate likes it alot on his jdm 4 pot but im not sure how im going to make it run a 6 pot

Any opinion or tips on how i can improve the build or any bit of help is appreciated..

also the b20 NV rods are much ticker than the b28 ones. which should i use? i can post a picture comparison if that helps

[Gunni]

If you can machine the pistons instead of using an MLS gasket, the BMW block isn´t designed to use one, you can that way just use a good BMW headgasket and you´ll never have any problems, If I was doing another 2.8 turbo stroker that is what I would do.

[balilu91]

P.S. Car will be mainly used for drifting

If you can machine the pistons instead of using an MLS gasket, the BMW block isn´t designed to use one, you can that way just use a good BMW headgasket and you´ll never have any problems, If I was doing another 2.8 turbo stroker that is what I would do.

are the pistons thick enough to be machined?

[balilu91]

Bump...

P.S. i just realized this post is more suitable for the "Turbo / Supercharger" Section where it will get more interest.. Can a mod move it for me? please

I might get more ideas there and i dont want to start a whole new thread over there..

[balilu91]

small update because i decided on a few stuff..

B20 NV Head
B20 Block Bored to 84mm
B28 crank/pistons
B20 Rods
MLS .140" Gasket
ARP Head & Rod Bolts
ACL Race series Bearings (All)
New Gaskets/Seals/Piston rings (All)

Balancing of crank with M20 Flywheel
Sachs 618 Pressure Plate
6 Pad clutch

Front Intercooler
E36 M3 Oil Filter Housing with M3 cooler
Custom Turbo Manifold
GT35 A/R .70 Turbo
AEM ECU


Most of these stuff listed have arleady been purchased. Next week taking the engine for rebore & stuff..