Some questions about Deere engines

FarmX3 · May 22, 2011

One thing for sure is the torque rise from the extra cylinder.

jonyyuma · May 22, 2011

I really liked the old Mercedes 5 cylinder engine that had factory turbos.. 120 hp...Lots of get up above 45 mph. This same engine was born a 4 cyl. in smaller cars.

JD3520Turbo · May 23, 2011

What is also strange is that JD used that 5cylinder in the 5225 and 5325 and then used a 4cylinder in the 54,55,5625's in previous years. Strange.

Edward. S · May 23, 2011

AKfish said:
Well... I think you answered the basis of my position. 75 Hp from the 179 cu. in. powerplant is likely at the upper limit and using it in a heavier chassis (with cab, too) tractor could shorten the "duty-cycle" for that powerplant. That's not a situation that JD wants for their "flagship" optioned tractor that is positioned for heavy duty applications with a long service life.

The 4.5L 4-cylinder powerplant turns out 85Hp while "yawning" with 8-9psi turbo boost. It's understood that turboing an engine also serves to "clean up" the emissions and fuel efficiency as well as increase power output. Dropping the turbo for a naturally aspirated engine for placement in the 65-75Hp range would likely "dirty" the emission's and make the engine fall out of the Tier III-IV rating's.

Check over the stat's here: TTL test reports/JD Deere

Good reading - and note that the 5 cyl. in the 75M is neck and neck with the torque output for the 85M!!

AKfish