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Old 01-07-2018, 12:49 PM   #5
John V
No more BMWs
 
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Join Date: Apr 2005
Carmudgeonly Ride: Ram, MS3, CX-5, RX-8
Location: Glenwood, MD
Posts: 14,753
I started on the rear subframe first, because I didn't have anything I needed to start working on the engine swap. A fellow competitor sent me a complete set of solid aluminum rear subframe bushings in exchange for me making him some delrin bushings for his car, so I got those installed. Removing the stock bushings was an absolute bear, but pressing in the aluminum ones just required some Acme-screw all-thread and some wheel bearing anvils.





The rear subframe with all the mounting bushings installed. You'll notice that the diff and axles are gone. The stock diff is certainly strong enough to handle the desired power level, but the available ratios are all tailored to the NA rotary and are far too short for a lower-revving piston engine. It's also a really heavy unit, and the axles aren't the strongest, so I will be going a different direction here.

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