>if Morris Garages had hit the perfect setup with a 3 main
>block....why did the ever develop the 5 main? Because a stronger bottom end
>is inherently able to live with a higher RPM limit with added longevity...
>How many mains in the Honda power plant?
>
>Answers?...I don't have any magic advice to the 3 versus 5 main argument but
>will add this to each side....BALANCE everything that rotates when you've
>got it apart....weigh the rods both big and little ends....match the
pistons >gram for gram...ensure that the clutch mechanism is also balanced
to the >crankshaft AND indexed to the balancing position....al
>Tom
The quote from one of my former mechanics (he was good, I moved away) was
that on the 1800 engine, a three main MGB engine was "a bit whippy." He
also indicated problems with breakage and warpage. My guess is that this is
why they made a 5 main. Another thing to consider is that a 5 main seems to
actually be lighter than the 3 main. That should help the upper RPM range
on the 5 main engines, but as I said before, I think my 3 main MGB engine in
my MGA revs better than my 5 main in my '67 (no smog) MGB. Maybe I better
check that distributor again, the shaft there tends to aquire rust and not
rotate freely after some time.
Phil Bates
58 MGA
67 MGB
75 Jaguar XJ12C
66 Land Rover
52 MG TD replicar (VW)
86 Peugeot 505 Turbo Gle
86 Honda Accord LX-i
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