This will give much faster throttle response and will cause smoke when changing gears. Loosen up the lock nut and turn the screw out about two rounds. There you will see an allen head screw with a lock nut on it. Pull back the top of the riveted on aliminum plate that surrounds the throttle shaft, assuming it is not already gone. Remove the throttle arm from the throttle shaft sticking out of the pump. If someone has been messing with the pump, and you do have a big cam as opposed to a small cam (the cam follower plates below the fuel pump are appx 3' tall on small cam and appx 6' tall on big cam), then you can set the AFC valve to give more fuel, assuming it is working right to begin with. Most people shimmed the pump to 2200-2300 for power and speed.

I have seen it too many times.Īnother thing, unless you have what Cummins used to call the Formula engine, then the rpm range is between 1700-2100, meaning don't go under 1700 when pulling hard. Thanks a million guys! I'm learning more about this thing every day!

How would I check the compression? Also, how involved is it to run an overhead? A friends dad has a compression tester for this thing. I've got a lot of tools and knowledge about smaller motors, I used to be an automotive mechanic. While I'm there I'll just have him replace that diaphram like stranger said. The old man that works there would like me to bring the pump in so he can check the flow and pressure of the pump. There is an injector pump shop about an hour from where I live. I replaced all the fuel lines last night to check that possibility off of the list. Are you saying I need to wrap it up a little higher before I shift? Medicineman, I've been shifting at 2,000 rpm, in the next gear that usually drops the rpm's to 1,500. it will take me three miles flat footed shifting at 2,000 rpm to get to 70 mph. I know this thing is less than half that motor.Įven empty at 26,000 lbs. I'm comparing it to my buddies 600 CAT on propane.not really I'm just kidding. The arenoid diaphram is connected to the pump, on the block side of the pump, and is connected with a small line from the intake manifold. I think that means Big Cam III, but correct me if I'm wrong, I'm new to all of this.

Cummins big cam 350