mf95 super ......fuel system

nick sutton

New User
I have a mf 95 super tractor with a bosch fuel system with the 425 6 cylinder diesel engine with the 4-3/4 bore but I don't know what would be a safe rpm to run. im looking for a little bit more snort so I can do tractor pulling and doing farm work with some more power
 
Bosch pump is designed to run up to 1900 rpm. Even with a roosa master pump they dont like much more than 2100. Its hard to get workable timing at higher speeds.
 
If you have stock valve springs, they will start to float around 2000 RPM. You can govern the Bosch pump to whatever you want simply by changing or shimming the spring, takes 30 seconds, I"ve done it between classes. I"ve had mine up as high as 3000. Mr. Moresmoke is right about the timing, you will need to advance your injection timing some if you"re going to run more RPM. Also, there is a way to turn the fuel up on that pump that takes about 3 minutes, if you haven"t done it already.
 

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