1938 a crankshaft question

[Anonymous-0]

Hi, i was told that if i installed a crankshaft from a styled tractor in a unstyled tractor that this would increase the stroke and in turn produce more hp. is this true and what else could be done without going radical with aftermarket parts. thanks in advance

 

[Mike N Mo]

A later crank will increase the stroke by 1/4" (6.6"-6.75"). Use a "A2360R" crank out of an early styled A. Put in some high compression pistons and you could have around 45 HP. Is this a tractor that will see actual work or strickly a puller? If it's a "user", don't get too radical on compression as you'll end up buying expensive fuel to control detonation. Mike

 

[Anonymous-0]

Tractor will be used for a few farm chores mostly will be used to go to plow days. hopefully .45 over will clean the block up so am already gonna have that going for me. also is the camshaft from this year decent of should i select one from another year?

 

[Mike N Mo]

Will, The research I've done in the past shows that styled A cams thru 630 cams have the same valve timing specs according to the service manual, and all have the same lobe lift. My understanding (thru the rumor mill) is that there is a difference between the unstyled and styled A cams, but I have never confirmed that, so take that for what is's worth. A cam reground to stock specs would offer slightly better performance than a 70 year old worn cam, so depends on if you want the work of replacement as well as the expense. Mike