I think in an article I just read it mentioned that the J4 was pretty
notorious for crank-mangling... The history of engine design seems to
uphold the contention that trading off crankshaft support for reduced
friction via reducing the number of main bearings doesn't pay off. The
winning solution was low-friction bearing designs.
Dan Dwelley had this to say:
>Hmmm. I'd still like to see that setup! Capable of close to 120? For how
>long and how many times.Once? :o)
>It was a smaller engine but the stresses on the mains must have been
>terrible.
>
>Dan Dwelley
>77 Midget
>Alexandria, Va.
>
>> Dan,
>> A four cylinder engine with only two main bearings can, actually,
>> operate pretty well. MG used only two bearings on four cylinder engines
>> on a number of models. I think the PA was the first Midget engine to get
>
>> three mains, so the J, D and M cars had only two.
>> According to J. Wherry, in his book The MG Story, the J4 was said to
>> have been capable of close to 120 mph, in 1933, with 750cc supercharged.
>> However, I can find no reference in his book to any extended warranty
>> programs for the engines.
>> Bob
>>
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--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the red one with the silver bootlid.
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