Posted by johns on August 26, 2012 at 05:08:02 from (220.127.116.11):
In Reply to: 3-71 detroit posted by 1948 mm on August 25, 2012 at 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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