M52 crankshaft

[Aptyp]

I see MM saying that 2.8 crank is forged, and then I see that m52 has lower red line.

Can some one tell me whether that crank is forged or cast?

I would like pics of the forge marks, TIA

-Art.

[nando]

the M52B28 crank is forged

M52 has a lower redline than what?

[Aptyp]

lower redline than m50

just like 2.7 had lower redline than 2.5 in m20.

[Aptyp]

Close ups of the crank any one?

[318isbmw]

Heavier rotating assembly. But once you chip the m52, it gives it the same redline as the m50 when chipped.

[Aptyp]

That's not my questions, but ok.

[318isbmw]

Sorry to answer the other statement your making, and btw just talked w/ a friend who has had both, and the redline is the same... 6500rpm. Search for for sale ads and you'll find pics I'm sure.

[Aptyp]

can't find casting nor forging marks on pics. Like crystal skulls they're made by gods.

[Aptyp]

And Rev limiter was set at 5900 on 2.5
and 5300 on 2.8

[nando]

And Rev limiter was set at 5900 on 2.5
and 5300 on 2.8

what?

the M20 has a ~6400rpm redline. M50/M52 is like 6500. where are you getting 5300rpm? that's like an eta with a chip.

[318isbmw]

can't find casting nor forging marks on pics. Like crystal skulls they're made by gods.

Well, the e30 is god's chariot, so you never know how the bmw motors are made:)

Their there, I'll look at the m50 crank I've got at home to find where they are.

[SpecM]

-Im 95% sure m52b28 cranks are forged

[318isbmw]

-Im 95% sure m52b28 cranks are forged

I'm positive they are, but I don't have pics of the markings.

[matt]

And Rev limiter was set at 5900 on 2.5
and 5300 on 2.8

False.

I would rev the 2.8 higher than the M50. They have better lifters and valve springs.

[SpecM]

And Rev limiter was set at 5900 on 2.5
and 5300 on 2.8

in an auto or 5-spd?
slush-boxes shift early sometimes