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640 vs. 641

M

Michaels Dad

Member
Neighbor inherited a 641 his late dad tore down to repaint. He's not sure what he's going to do with it, but as we were discussing it I told him I looked up the specs on it.
Same bore and stroke, = same cubic inches as my 640, but Tractor Data says the the 641 has 188 more HP. How is this possible?
 
A late large carb unit will likely show a littl emore hp, and less fuel economy. I wouldn't trust tractor data but instead look for nebraska test results.

172's were the same way. small carb, large carb.
 
Do not trust the information that you read on Tractordata.

Neither the 134 CI engines used in the 6/7** series tractors nor the 172 CI engines used in the 8/9** series tractors produce anything approaching 188 HP. Is this a typo?

IIRC, the only significant performance enhancing improvement between the 134 engines used in the 6*0 tractors and the 6*1 tractors is a slight increase in CR.

PTO HP is nearly identical.

Dean
 
I have a 1956 640.

The 640 has 31.0 Hp (at 2,000 rpm) at the PTO (727 rpm) and 28.0 Hp at the drawbar.

The 641 has 33.0 Hp (also at 2,000 rpm) at the PTO and 29.0 Hp at the drawbar.

So that's one Hp more. You probably get that much variation between identical models off the assembly line.

There is likely some change in transmissions. The 641 has a capacity of 1.5 qt more capacity in the transmission and 1.0qt less hydraulic fluid capacity. I assume Ford changes the transmission ratios but I don't find
that data. Fuel capacity is different as well. Little things in a updated model.
 
trannies don't make HP.

if rpm and displacement is the same, fuel/air mix or compression ratio has to have changed for a hp change.
 
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