My 1st decent drive of Model A and discussion

[Synchro909]

Originally Posted by M2M

What causes this strain you mention on the main bearing? Apart from counter weighted crank are there other ways to tackle it?

What counter weighted cranks are currently available?

I think just about all of the four cylinder, 3 main bearing engines of the day were weak at the middle main bearing. They were simply under done for the way we drive them today. To improve its longevity, I feel a counter balanced crank is the best (though expensive) option. Prfessure feeding oil to it helps. That puts more oil through the bearing, helping to prevent it getting too warm. Probably the easiest way to look after it is to keep the speed down.
I'm sure others who have played with this longer than I will have more thoughts.