02-05-2020, 03:55 PM
(02-05-2020, 02:38 PM)Alan Wrote: Yes, and I’ve lost count of the number of crank cases I’ve seen with the mounting feet missing. Using the crankcase to stiffen the chassis is not a brilliant idea.
Stuart Rolt who put my two bearing pressure fed engine together was a firm advocate of isolating chassis flexing from crankcase. I remember him spending five minutes trying to impress me on the need to do this when I picked up the engine.
Since then I’ve used an old valve spring under the top hat section which gives a firm but relatively flexible mounting. One or other ( or both) of the rear mounting points.
Im sure Ian is right when he rather dismisses the idea as being of limited use but I guess it’s nice to know my other car with a three bearing engine is free from crankcase distortion.
The idea of using the crankcase to stiffen the chassis does seem a bit crazy somehow.