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Re: Diesel injector pumps: More HP?
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Posted by James2 on August 14, 2005 at 12:49:11 from (207.179.239.4):
In Reply to: Diesel injector pumps: More HP? posted by LD5030 on August 14, 2005 at 06:50:26:
Without going to a lot of detail, yes you can increase hp by just turning up the pump without more rpm on an NA engine up to a certain point. Then you will require a softer governor spring to effective utilize the higher pump settings, or you can increase rpm's. Increasing the rpm coupled with increasing the pump is more effective because HP=(torque,in ft/lbs)X(rpm)/5252. On an NA engine you can gain power/torque by adding fuel until you reach stoichmetric conditions. This means you are burning all the air available. The problem is you will be putting out more smoke than a poorly run locomotive. If run this way very long, burned/melted pistons, valves and so on will be your reward. We have run diesel NA engines APPROACHING this limit for approximately ten minutes, without breaking. Samething with a turbo engine, with all the extra air, can pump even more fuel in until you reach stoichmetric conditions or until something breaks. With a turbo this is hard to do because it will give more air until it "chokes" or "stalls". Then the air supply plumments and power level falls off a precipice, but you are still pumping in the fuel for an instant, until the rpm's also drop. You can solve this by installing a larger turbo (either the turbine housing or compressor housing or both) and just run the engine until it does break. What I have written is just a quick explaination, and left a few "holes" which could use some more detail.
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