Big Cam Cummins problems

Never been on one of those. Spent a lot of time with this CP T-650 though.

When you get the chance measure the diameter of the pulley on the water pump from the engine that came off the drill originally, then measure the one on the drill now.

 

The engine is deck mounted correct?

 

Do u you know if the replacement engine had larger injectors in it??

 

What about air to air? Did it have one in the truck and does it have one now?

 

You kind of have a Frankenstein engine there.

You have 14 and 1/2 to 1 compression Pistons, which is normally 350 horsepower, but you have those larger injectors in there.

By the way I don't know what those injectors are for but I had another big cam 400 in another truck that had those injectors and my God that truck was like a bullet.

I bought it that way they had it turned up and basically the engine self destructed.

Part of the problem possibly is you changed the pump but the pump and the injectors have to work together as one unit. The injectors are set for the calibration of the pump. If you take the injectors and the pump to a good Pump Shop they can flow the injectors to the pump.

When you mix applications from a stationary unit to something from a truck the engine is going to behave differently. Isn't necessarily you have to make it to a certain CPL but there are large injectors with the timing of 14 and 1/2 to 1 compression and the stationery pump... that combination is probably not good.

You should try to set the timing and the pump and the injectors to whatever CPL that original stationary engine was. If that is the pump from the stationary engine there should be a number on it.

If the original engine was a 400 it probably had 14 to 1 pistons in it. With that engine with the 14 and 1/2 to 1 you really need to slow the timing down because the timing was even faster on those engines.

In my opinion higher compression more fuel faster timing and a different pump will give you an unknown result.