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  1. #1
    Elite Member Tx Jim's Avatar
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    JD 4255/Kubota M7040 HDC

    Default Why did JD put a 5 cyl engine in only 2 tractor models?

    Anyone know why JD put a 5 cylinder engine in the 5065M & 5075M???? Thanks,Jim

  2. #2
    Elite Member Zebrafive's Avatar
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    John Deere 2030, John Deere 6415

    Default Re: Why did JD put a 5 cyl engine in only 2 tractor models?

    No Idea, but didn't the 5325 also have a 5 cylinder?
    John Deere 2030 JD 245SL Loader
    John Deere 6415 mfwd JD 640SL Loader

  3. #3
    Veteran Member
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    Deere, several

    Default Re: Why did JD put a 5 cyl engine in only 2 tractor models?

    Chassis , frame and overall tractor length. Cost, emissions and fuel efficiency. Fours need a balancer system.

  4. #4
    Elite Member Tx Jim's Avatar
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    Default Re: Why did JD put a 5 cyl engine in only 2 tractor models?

    Quote Originally Posted by buickanddeere View Post
    Chassis , frame and overall tractor length. Cost, emissions and fuel efficiency. Fours need a balancer system.
    I'll rephrase my question. Why so few models in the same time frame had 5 cyl. engines compared to 3 or 4 cyl???

  5. #5
    Elite Member Tx Jim's Avatar
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    Default Re: Why did JD put a 5 cyl engine in only 2 tractor models?

    Quote Originally Posted by Zebrafive View Post
    No Idea, but didn't the 5325 also have a 5 cylinder?
    Yes 5325 plus probably several more models had 5 cyl engines as I only did limited research.

  6. #6
    Elite Member Tx Jim's Avatar
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    Default Re: Why did JD put a 5 cyl engine in only 2 tractor models?

    Quote Originally Posted by buickanddeere View Post
    Chassis , frame and overall tractor length. Cost, emissions and fuel efficiency. Fours need a balancer system.
    So is it cheaper to add another cylinder(piston,rod & valves) just to eliminate balancer shafts? Will a 5 cyl(same L) be more fuel efficient than a 4 cyl??

  7. #7
    Veteran Member
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    Default Re: Why did JD put a 5 cyl engine in only 2 tractor models?

    A smaller turbo engine will be more fuel efficient at part load than a larger natural aspirated engine of the same peak HP.the small turbo will be just as efficient as the larger natural aspirated engine at peak HP.
    The small turbo engine is also easier to meet idle and low load emission regs with than the larger NA engine.

  8. #8
    Elite Member Tx Jim's Avatar
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    Default Re: Why did JD put a 5 cyl engine in only 2 tractor models?

    Quote Originally Posted by buickanddeere View Post
    A smaller turbo engine will be more fuel efficient at part load than a larger natural aspirated engine of the same peak HP.the small turbo will be just as efficient as the larger natural aspirated engine at peak HP.
    The small turbo engine is also easier to meet idle and low load emission regs with than the larger NA engine.
    What has turbo-charged vs naturally aspirated engine go to do with "WHY" JD built some model tractors with a 5 cyl engine????????? I was thinking electronically controlled fuel was supposed to be the great gift for cleaner air.

  9. #9
    Veteran Member
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    Default Re: Why did JD put a 5 cyl engine in only 2 tractor models?

    A diesel, a gas turbine or a non throttled boiler has lousy part load fuel efficiency. Too much unused air swept throught the combustion chamber and out the stack without participating in combustion.
    As posted on the "other" site. A five cylinder provides the vibration and noise of a four cylinder with the fuel efficiency of a six.

  10. #10
    Elite Member AKfish's Avatar
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    Kasilof, Alaska
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    JD 5075M; JD 110 TLB; Ford Ferguson 9N: JD X300R

    Default Re: Why did JD put a 5 cyl engine in only 2 tractor models?

    I haven't done an "exhaustive" search on that engine... but, I did some digging before I bought my '11 5075M. deere also uses that engine in some of their skid steers and they use it for stationary power - pumps, gen sets, etc.

    I can only surmise that buickanddeere is on the general track for "justifying" Deere's use of the 5-cylinder - smooth, very efficient and reliable - 8,000 hours MTBF for a non-liner engine block is pretty impressive!

    Same bore x stroke as the 4024T 4-cylinder engine. Some engineer hauled out the duct-tape and added another cylinder and called it - good..

    AKfish
    "Most people want to live on top of the mountain, but all the happiness and growth occurs while you're climbing it."

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