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Go Back   Madabout Kitcars Forum > Mad Build Area > Seven Style builds

Seven Style builds Westfields, Caterham, Dax Rush, Luego, Robin Hood, Tiger, Locust, MK, RAW, Quantum, you name it, you're building it, share it here.

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  #1  
Old 17th January 2012, 21:54
Mike Mike is offline
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Default Sierra Rear Diff Support

I am building a Marlin Cabrio which uses a standard 7" Sierra diff (mine is the 3.38 ratio), and makes use of the original rear rubber D bracket. Having just got the engine fired up (BMW M50 2.5), I can now see how much this will allow the diff to contra rotate - the prop flange must move 2" just letting the clutch out to spin jacked up wheels. So when they are firmly planted it will be much worse.

I have looked at ways of reducing this rotation, and see two options. One is to use a polybush version of the D bracket, but guess this will be very stiff, and probably noisey, and suffer lots of vibration.
The other is to swap from my Sierra 7" to a late Scorpio 7.5" diff with Koala back plate and the double rubber enclosed bushes: I believe the 2.5 diesel had a 3.36 ratio). This looks like it would greatly reduce the possibility of roataion, yet should help dampen the vibration/noise down.

All good in theory - has anyone any experience of the Scorpio diff with the koala rear mount?

regards
Mike
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Old 31st January 2012, 08:49
w4lrus w4lrus is offline
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I am sorry I can't help you with your query, but if you do decide to swap out the diff for a 7.5" unit, I would be very interested in buying the 7" diff from you...
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Old 1st February 2012, 20:16
Mike Mike is offline
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Quote:
Originally Posted by w4lrus View Post
I am sorry I can't help you with your query, but if you do decide to swap out the diff for a 7.5" unit, I would be very interested in buying the 7" diff from you...
Hi W4lrus
I have sent a PM
Mike
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