M20 2.7i 2.8 stroker guide!! (Updated)

[NJ2.5rser]

Yea Ill have to re scan them a little better hopefully at some point today. But glad I could help as im getting ready to do a 2.8l stroker now so its perfect!

[jdirty]

Yea Ill have to re scan them a little better hopefully at some point today. But glad I could help as im getting ready to do a 2.8l stroker now so its perfect!

No worries! It was a pretty good read as it is. I'm new to m20s so this is really helpful. I supposedly have a 2.7 in a wrecked 525e that I bought and I just wanted to see what really has been done. Maybe I'll turn it into a 2.8 before swapping it into my e30. Lol good luck with your build!

[Vin-barrett]

Great article , thanks for posting.
For the sake of clarity ,it's worth noting (particulary for the piston & compression ratios) that the article is speaking from a perspective that is across the pond (not USA cars).

[NJ2.5rser]

Yes I'm glad you noted that this is a European magazine.


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[frankenbeemer]

Yes I'm glad you noted that this is a European magazine.


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Good stuff thanks for posting! Looking forward to reading all of page 2 :).

[digger]

all of that stuff is already discussed in the M20 section and as alluded to not quite as easy using the "US" sourced parts

[NJ2.5rser]

M20 2.7i 2.8 stroker guide!! (Updated)

Of course it's been discussed. But here's a solid piece of good reading. Leaves some good food for thought and right from a reliable source.

Not all the U.S and and European parts are different though. I would be interested though just not sure on some of them.
For instance does anyone know if the euro e rods and late model short skirt i pistons are the same as us spec?

To put it to the test I've decided to follow the 2.8 build to the t and see what results I get. Just got the motor inside today, tear down starts tonight I'll keep you guys posted.


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[digger]

Of course it's been discussed. But here's a solid piece of good reading. Leaves some good food for thought and right from a reliable source.

Not all the U.S and and European parts are different though. I would be interested though just not sure on some of them.
For instance does anyone know if the euro e rods and late model short skirt i pistons are the same as us spec?

To put it to the test I've decided to follow the 2.8 build to the t and see what results I get. Just got the motor inside today, tear down starts tonight I'll keep you guys posted.


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rods and pistons are common for the most part..... on the 8.8:1 engines it depends which exact year and brand as to what skirt you get. euro got a higher comp piston before the 8.8:1 was released about 1986iirc maybe a bit before that and a bit after to. but more importantly its the cranks that are different. the earlier B28 cranks have smaller counterweights and you can get away without machining skirts or counterweights with the right crank and skirt combination even with a 130mm rod. of the US builds ive seen none had the smaller counterweight design including the one i have.

a 2.8 from OEM is a solid build nice and torquey

[R3VMEISTER]

Overall, I enjoyed the read. Thanks for getting it posted up!

[Swanny]

Thanks for posting!!!

[Hooffenstein HD]

all of that stuff is already discussed in the M20 section and as alluded to not quite as easy using the "US" sourced parts

Digger, if anybody knows you would; Is there any difference between Australian spec 325e, USDM 325e, or Euro 325e?

The reason I ask is I pulled a bottom end from a 1985 325e for a budget 2.7i build and figure this should be a 10.2:1 variant?

[digger]

Digger, if anybody knows you would; Is there any difference between Australian spec 325e, USDM 325e, or Euro 325e?

The reason I ask is I pulled a bottom end from a 1985 325e for a budget 2.7i build and figure this should be a 10.2:1 variant?

pretty sure the oz ones are 9.0:1 but not 100% sure. what does the engine code say near the engine number 27XXX?

[SkiFree]

not quite as easy using the "US" sourced parts

Emphasis on this .....


For reference, here's the M20 piston variants. Note you can at least narrow it down with a quick look at the dome. (link credit to Keith/whodwho)

http://www.scribd.com/doc/12801628/Mahle-Pistons-M20

And as far as convincing Mahle to make more cast high-comp euro pistons, don't bother. I spent about 2 months trying to make it happen with no luck.