I have a '67 5 main B, and a 58 MGA with a 3 main MGB (1800) motor. I have
found that the 3 main is a bit more free revving, so it feels like it has more
power. The early 3 main B motors did have problems (first 1/2 year production
in the American West only), but the factory replaced them free of charge with a
more durable 3 main motor (I am not sure what the change was. Basically the
crank was a little weak for the way people drove the cars, and tended to warp,
then crack at over-revving. The 5 main is rock solid, but not as free
revving. For a '64 I wouldn't worry about it, just make sure the oil pressure
is good.
Phil Bates
52 MGTD replicar (VW)
58 MGA
66 Land Rover
66 Citroen DS21 Pallas
67 MGB
69 Porsche 911T targa
75 Jag XJ12C
86 Honda Accord Lx-i hatchback - for sale, anyone need a honda?
Mark Davidson wrote:
> I am looking at a '64 MGB with a 3 bearing motor. I have, however, just
> been asked by somebody in the local MG Club, "...why a 64? Has the engine
> been replaced... the older 3 main was a lemon."
>
> Can anybody share their views on the 3 bearing vs. 5 bearing engine? Any
> particular headaches with one over the other? Anything I should be careful
> to look for in the 3 bearing engine before I buy?
>
> Thanks,
> Mark
> .........................................................................
> Mark R. Davidson - Professional Web Development
> MRDavidson@sympatico.ca
> ICQ No. 29675858
|