Terry Sayther's '72 CSL is up for auction again on BAT

Don, I assume you are referring to the Runway Model Thin cylinder walls. In the early 60's we would have our Chevy 283 cu inch engines bored out to wafer thin walls. And stroked. And a hot cam. And triple carbs and I could go on and on. Those really were the days my friend.
 
CamayroZ said:
What is a 3.6L M90?

Does that mean that it was bored or stroked? So it is at the limit?

Thank you.
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In this case the motor was stroked. In one of the earlier auctions they noted that the engine used the crank from an M30 3.5. The M90 has a bigger bore and shorter stroke than the M30 3.5. If you swap the crank from a M30 3.5 into an M90 you get the 3.6 using the stock M30 3.5 crank. You can use the 3.5 M30 rods but you need custom pistons. If you bore and use the 3.5 crank you can get 3.7 liters, but as sfdon noted the distance between the cylinders is getting small and head gasket issues can arise. Better reliability with an M90 is when you stay with the stock bore. Terry is no dummy, he stayed with the stock bore when they built that motor. Plenty of poke for a lightweight, in this case the extra 100cc aren't worth the potential cylinder headaches (sorry for the bad pun but I couldn't help myself).
 
Wes said:
Boo..... :D Golf carb CSLs are the best. Well, except Colorado..
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Golf is one of my favorite bmw colors as opposed to calling it yellow…I know Terry’s golf e9 well…traveling with Terry in my 2002 Baur Targa.

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