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J

James Williams

Well-known Member
I bought a BF Avery A,and it has a 133ci motor with a flat head.Will the flat head with the valves in the block reduce the HP,compared to overhead valves,This tractor is about the size of a Farmall B,I wonder what the hp rating is

jimmy
 
That engine may have more hp in the Avery since the engine the B is 113cid unless it has an overbore kit and that only raises it to 123cid.

Having the valves overhead makes them easier to adjust. When flat heads were used in cars and trucks you had to work under the fender to adjust the valves or replace a broken valve spring. That
shouldn't be that hard on a tractor.

My sister had a Ramber American and it broke a valve spring and the owner of the garage was a WWI
vet and he just leaned over the fender and changed the spring and adjusted it. Hal
 
Normally what I see, the flat head engines seem to have a little more torque than the OHV engines. My opinion only.
Jim
 
Horsepower
Does it tell us anything that even lawnmowers now have OHV engines? Its all about combustion chamber design, very limited on flat heads, engineers got all they could out of that obsolete design. (even though I would dump the 350 Chev that I put in my 1953 F100 if I could afford to build a full dress flathead Ford V8)
Bob S.
 
James An overhead valve arrangement has a better air in and out flow than the flathead so with that more effecient flow should come more horsepower.
 
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