RE: BMW M3 (E90): PH Fleet

[xjay1337]

Jeez, calm down.

[Car-Matt]

xjay1337 said:

Jeez, calm down.

I'm lovely and chilled, Guvernator seems to have lost his temper because his memory of all these mid 2000's high revving powerful V8's has let him down at the crucial moment.

[Tony B2]

fido said:

He may have a point.

Ford Mustang 5.2 8250 rpm - flat plane crank, a couple of Ferrari V8s which may not be mass-produced per se but there are enough of them knocking (or not) about, and of course they have a flat-plane crank.

Maybe the previous theory is correct, and it's to do with the crank balance, which would affect the distribution of BMEP on the bearings. It might also explain why there are 3 revisions of the crankshaft.

Do you have more info on the 3 revisions of the crank?

Time windows when manufactured, differences, etc?

[fido]

Tony B2 said:

Do you have more info on the 3 revisions of the crank?

Time windows when manufactured, differences, etc?

You can find it on the M3 forums - search for 'Crankshaft History and Part Numbers'.

BMW Part Number Description Weight Kgs Application Prod. Start Prod. End Superceded By
11 21 7 841 641 Crankshaft with Bearings 43.9 lb 19.9 kg S65B40 Jun-07 May-08 11 21 7 841 658
11 21 7 841 658 Crankshaft with Bearings 45.0 lb 20.4 kg S65B40 Jan-08 Feb-09 11 21 0 443 639
11 21 0 443 639 Crankshaft with Bearings 41.0 lb 18.6 kg S65B40 Jan-09 Present

(I'm reading up on this stuff as I want to know how my engine is going to be rebuilt.)

Edited by fido on Thursday 18th April 20:49

[Tony B2]

fido said:

Tony B2 said:

Do you have more info on the 3 revisions of the crank?

Time windows when manufactured, differences, etc?

You can find it on the M3 forums - search for 'Crankshaft History and Part Numbers'.

BMW Part Number Description Weight Kgs Application Prod. Start Prod. End Superceded By
11 21 7 841 641 Crankshaft with Bearings 43.9 lb 19.9 kg S65B40 Jun-07 May-08 11 21 7 841 658
11 21 7 841 658 Crankshaft with Bearings 45.0 lb 20.4 kg S65B40 Jan-08 Feb-09 11 21 0 443 639
11 21 0 443 639 Crankshaft with Bearings 41.0 lb 18.6 kg S65B40 Jan-09 Present

(I'm reading up on this stuff as I want to know how my engine is going to be rebuilt.)

Edited by fido on Thursday 18th April 20:49

Interesting. That is a substantial difference in weight. I wonder if the flywheel also changed in these periods.

From memory, the bearing specification (material, if not dimensions) changed during 2010.

More research time coming up!