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Forum: Model A (1928-31) 05-16-2018, 02:37 PM
Replies: 39
Views: 10,814
Posted By wmws
Re: How Fast Will It Go?

Brent, I think Henry may have been stretching truth in advertising a bit, but as I remember they did run a Model A from I think it was LA to Phoenix and averaged 60 MPH. As an ex motorcycle road...
Forum: Model A (1928-31) 05-15-2018, 04:57 PM
Replies: 39
Views: 10,814
Posted By wmws
Re: How Fast Will It Go?

I would think that if valve float didn't limit the RPM before 3000 the next thing to go would be the crank. I'm not worried about the babbitt. But there is a lot of weight reversing direction twice...
Forum: Model A (1928-31) 05-15-2018, 09:35 AM
Replies: 39
Views: 10,814
Posted By wmws
Re: How Fast Will It Go?

Thanks for the explanation Brent. So you are saying that with a well balanced engine that 3000 RPM is no problem.
Forum: Model A (1928-31) 05-14-2018, 07:24 PM
Replies: 39
Views: 10,814
Posted By wmws
Re: How Fast Will It Go?

Someone explain if these engines were so well balanced leaving the factory why do we now add large counter weights to smooth out vibrations.
Forum: Model A (1928-31) 05-10-2018, 07:58 PM
Replies: 39
Views: 10,814
Posted By wmws
Re: How Fast Will It Go?

I don't believe the stock A crank was dynamically balanced. With a 3.78 rear and 21 inch tires 70 MPH is turning at 3100 RPM. That's a lot for a stock A engine.
Forum: Model A (1928-31) 05-10-2018, 11:40 AM
Replies: 39
Views: 10,814
Posted By wmws
Re: How Fast Will It Go?

The question should be what RPM will the babbitt withstand. I would say not over 2000 RPM for any sustained driving. I never cruse over 1750 but then I have a Mitchell OD.
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