BMW M21B28 - stroker

Finally, a home for all you 524td oil burners out there.
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Rafhael
Posts: 3
Joined: Oct 17, 2019 1:47 PM
Location: Brazil

BMW M21B28 - stroker

Post by Rafhael »

It is a BMW E30 Touring, originally with an M21B24 engine.

I'm from Brazil, and I like the Brazilian way. I decided to make some changes but the project is still in progress.

List of upgrades

Engine
- Pistons 0,50 M51
- Crankshaft s52 89,6mm
- mechanical injector (I already bought the car without the injection pump which was electronic, I bought the electronic one and checked it but it didn't work.)

Gearbox (Before it was automatic)

Gs6-37DZ - 6 gears

Diff

2.93 Torsen


In Brazil there are almost no small cars with diesel engines, the country banned it, but as this car was bought by a Portuguese ambassador, who after the service returned to his country of origin and the car was sold to a private individual

My fear was that I wouldn't be able to get spare parts, so I ended up buying a 524TD that was wasted for running illegally in Brazil.


The engine is already running, the engine has not exploded (yet)

Gearbox and cardan in place, but the car is dismantled for painting and without brakes and clutch pedal
Rafhael
Posts: 3
Joined: Oct 17, 2019 1:47 PM
Location: Brazil

Re: BMW M21B28 - stroker

Post by Rafhael »

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Before paint engine bay

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Gearbox ZF GS6-37dz

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Engine block

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Torsen and 2.93 gear (before 3.25)

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m51 piston x m21 piston ( I used them to compensate for the difference in crankshaft stroke)

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Rafhael
Posts: 3
Joined: Oct 17, 2019 1:47 PM
Location: Brazil

Re: BMW M21B28 - stroker

Post by Rafhael »

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Piston m51 and m21

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It was necessary to do a little sanding so that the crankshaft could spin freely without the connecting rods touching the block.

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The S52 crankshaft was also a problem, as it used short 130mm connecting rods from the m21 engine, it was necessary to machine the crankshaft counterweights, then the assembly was balanced.

all the work has been done, and the engine has worked very well a few times, but it has not yet been put on the street
turbodan
Posts: 9177
Joined: Jan 09, 2007 10:19 PM

Re: BMW M21B28 - stroker

Post by turbodan »

That's a cool project, looks like you're doing good work.
Galahad
Posts: 521
Joined: Sep 06, 2016 9:08 PM
Location: Beverly/Worcester, MA
Contact:

Re: BMW M21B28 - stroker

Post by Galahad »

I'm interested to see how the engine turns out. Neat story with the car
Mike W.
Posts: 27021
Joined: Feb 12, 2006 12:00 PM
Location: California Whine Country

Re: BMW M21B28 - stroker

Post by Mike W. »

Not an E30 guy, but it's still a BMW and you're working on a BMW engine, doing creative things. I like it. Keep it up and keep us posted.
Rust Bucket
Posts: 111
Joined: Dec 27, 2020 1:06 PM
Location: Montreal

Re: BMW M21B28 - stroker

Post by Rust Bucket »

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Looks like delicious mangos.

Hope to hear more from you.
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