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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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3-71 detroit

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1948 mm

08-25-2012 08:02:48

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I am posting this in the oliver section because I know you guys are more familure with detroit engines. I have a friend with an LA case with a 3-71 installed and he is looking for more horsepower for antique tractor pulling. How much rpms can you safely run? This one runs around 1800 with no load. Also is there anyway to turn up the fuel. Thanks

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tech cann

09-03-2012 22:24:12

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 Re: 3-71 detroit in reply to 1948 mm, 08-25-2012 08:02:48  
And when you work on these engines always have a steel plate to put over the intake in case of a runaway . NOT A PHONE BOOK they eat phone books

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08-26-2012 05:08:02

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 Re: 3-71 detroit in reply to 1948 mm, 08-25-2012 08:02:48  
Is he willing to take the engine apart or does he just want to do some tuning? Before you do anything buy a 71 series Detroit service manual if he doesn"t have one. A guy can do alot of damage and risk the motor running away if the rack and gov. are adjusted wrong. I"m assuming since you asked how to turn up the fuel you are not familiar with how a Detroit runs. There is no injection pump. Each unit injector runs off the cam and is timed to deliver fuel. Most 3-71s ran 2100 rpms all day long in other applications. After you get a manual go to the Oliver Heritage website and order back issue #30 from April/May 2009. Editor Sherry, along with help from Detroit expert Scott Franklin did an excellent article on how to get more power out of a 3-71. N series injectors, liners, 18.7:1 pistons, and 4 valve head will all help make power. I can"t stress enough to follow the service manual excactly and in order when adjusting the valves, fuel rack, and gov.

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jordan hackman

08-25-2012 22:10:05

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 Re: 3-71 detroit in reply to 1948 mm, 08-25-2012 08:02:48  
buzz looks about right, heck the 990 and 995 ran at 2000 or more rpm.

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08-25-2012 18:38:37

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 Re: 3-71 detroit in reply to 1948 mm, 08-25-2012 08:02:48  
probably 24 - 2500 max without a lot of expense. install bigger injectors, increase fuel pressure

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