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#1
17th May 2009, 05:13 PM
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Ahh, M42 is a much simpler proposition. Profile gasket should be checked out while its out though and might as well do the cam chain tensioner. Cant help much more though, i'm a six pot boy
 E30 diffs are the same across the range with regard to mounting. They come as either small or medium case. Bigger obviously stronger and fitted to the larger engined cars. Favourable ratios or LSD (for a 1000kg BM) are getting a bit pricey now up around £250-350 but i dont know what sort of ratio you need in a roadster (not started building yet) Mount with four large bolts on top through the rear beam, and a large bushe mounted 'ear' to one side. (this can be replaced with a Z3 bush for stronger mounting)  Cheers Chris Last edited by Chris_ : 17th May 2009 at 05:35 PM. Reason: Piccy added 
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#5
17th May 2009, 10:47 PM
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Quote:
Thanks for the pics. Bob.
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#6
18th May 2009, 08:36 PM
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Couldn't tell you in any major technical detail. but.
The four bolts hold it to the rear beam, the rear beam attaches to the body with some quite sturdy bushes, one at each end. Although these are strong i think they would be wear out a lot quicker if it wasn't for the 'ear' which i have always just presumed is the main torque bearing structure. But actually looking at it a little closer, i reckon you might get away with just mounting it with the four bolts. They are spread across a decent length, and are at two different seperation distances. I reckon it could take the loading ok. Need someone clever to look at it i reckon. Chris Last edited by Chris_ : 18th May 2009 at 08:36 PM. Reason: Spelling
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#7
18th May 2009, 09:49 PM
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Mind you, (thinking again, always bad for me) when they run proper power in E30's the bodyshell where the rear cover bush (the 'ear') mounts does have a tendancy to rip away so it must take some fairly significant forces.
Hows about an E36 diff (not compact) these have a pair of 'ears' and are considered to be stronger. As well as more symetrical. Chris
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#8
19th May 2009, 06:54 PM
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Right i've been musing over this at work today, did some (very very) rough drawings and measureings.
I reckon, but dont quote me on it, The Diff is subjected to torque loadings on two axis - The longitudinal twist from the prop shaft/gearbox/engine. And the latitudinal twist from the road wheel friction (equal and opposite Blah de blah) So the four main mount bolts hold the diff solidly to the rear beam which then opposes the torque of the prop shaft through the entire width of the beam and the butch mounts at each end (decent leverage, lower force) The big ear at the back is a just a stabilising link. Friction from the tyre-road interface will try to oppose the driveing torque and force the rear of the diff off of it's centre line. It it didn't have the 'ear' it would be working on a lever about 18 inches to try and break the beam bushes. So they've thrown in this rear stabiliser. So, Cut the ear off, solid mount the diff from two transverse box sections of of a pair off diaginal longitudinal box sections, job done. I think they are M12's so get 8.8's and it 'should' be strong enough with the weight of a roadster  Cheers Chris
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#9
20th May 2009, 09:28 AM
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Hi, looking at your picture the set up is v similar to the sierra and the ear mount is there to stop the diff/beam moving up/down.
if you were to fit it in the roadster chassis you can mount it using the four front bolts and do away with the rear mount as you will be mounting solidly direct to chassis not via a rubber mounted beam Ray 
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#10
13th August 2010, 08:36 AM
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See my flicker pics for what I am doing with my 4 cyl bmw build. Will post some pics of my front upright conversion soon.
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