sd455dan
Super Member
- Joined
- Oct 23, 2012
- Messages
- 5,210
- Location
- North Idaho
- Tractor
- Rhino 554, Ford 550 TLB (JD X500, MTD, Gilson riding mowers) Ford 3000-Sold
Thats the difference between the performance of diesels and gas engines. Diesels when loaded drop in rpm but the available torque increases with that drop in rpm. Gas engines just drop in rpm and also drop the available torque.
That is not always true in tractor engines.
I can't find it now but Nebraska tractor tests at one time had both the gas and diesel Ford 3000 engines graphed and the gas had torque number which extended about 150 RPM Lower down to around 800 RPM IIRC
a quote from yesterdays tractors:
If you were to root out the nebraska test results for the Ford 3000 and 5000 tractors in both the gasoline and diesel versions using the 175 cid and 233 cid engines respectively I believe you'll find that they have almost identical curves... much to the point that the profiles are the same excepting that the spark engine will probably achieve peak torque at 100-150 rpm faster than the diesel. This will result in the spark engine being a bit prouder on the top end because the torque rise was basically identical to the diesel. Again... SAME cam shaft in both. Same lift. Same duration. Same stroke and displacement.
Interesting bore / stroke as well being "dead square" engines @ 4.2" x 4.2"
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