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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Repower HP

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Big C

03-21-2005 05:56:17




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This is about an AC HD16AC but I think the same basic principals apply to all makes and models.. Anyway here is the point:
When you repower a unit how much extra HP can you increse the unit by safely?
and
If your new motor has more too much hp why can't you just throttle it down and not run it full out?
I know most people say to turn the pump down but explain to me what the difference is...unless you need the higher rpm's for some reason?

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Bob/Ont

03-21-2005 08:03:46




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 Re: Repower HP in reply to Big C, 03-21-2005 05:56:17  
Big C, it's an apples and oranges topic. If you repower a machine you need the right torque at the right speed to make things work. Inside a fuel pump there is a max fuel setting that controls the max torque through the fuel injected and a high idle/full load setting. In most cases these are done on a fuel pump test bench. Even if you throttle down the engine can put out more torque than the machine can stand if it's over powered. Lower engine speed can also give you too low of fan speed and make things over heat. Governor spring and weight combinations can give different performance too. It can be a trickey game some times.
Later Bob

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hector gemme

03-21-2005 09:31:46




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 Re: Repower HP in reply to Bob/Ont, 03-21-2005 08:03:46  
HI You receive the reason frm BOB. HECTOR



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Big C

03-21-2005 09:08:42




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 Re: Repower HP in reply to Bob/Ont, 03-21-2005 08:03:46  
Yeah...diesel work so much differently than Gas. It seems like the diesel all you have to do is add or take away fuel to increase or decrease hp. But if you take away fuel won't it be too lean. Or does retiming the pump take care of that. Now I can take a any kind of gas motor and make it scream..but this diesel stuff is all Greek to me.



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Bob/Ont

03-21-2005 09:35:09




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 Re: Repower HP in reply to Big C, 03-21-2005 09:08:42  
It's actually a lot simpiler than a carbourated engine Big C. More fuel means more power up to the max air fuel ratio. Then you need a turbo for more air and the fuel can be increased more. A diesel runs very lean when not under a heavy load and uses no fuel at all when the load is pushing the engine like a truck going down hill. New fuel injected gasoline engines work this way too but they can't burn that lean and still fire under light load. Timing is to get the burn going to give max pressure as it goes over TDC. Also the diesel fuel burns slow compared to gasoline that is more of a fast explosion. The longer burn is where the higher torque comes from. It's that torque that can wreck a machine if you repower with an engine that has too much power. The torque soon finds the weak spots.
Later Bob

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Big C

03-21-2005 09:57:41




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 Re: Repower HP in reply to Bob/Ont, 03-21-2005 09:35:09  
So let me get this straight;
1.Fuel timing on a diesel is just like the ignition timing on a gas. You don't ever change it much because it is dictated by the postion of the piston and max pressure achieved in the cyclinder.
2. More fuel = more power; up to the maximum amt of air you have.
3. More air(turbo) + more fuel= even more power

So if I have turbocharged diesel and I want to "turn it down"
A. Can I just turn down the injection pump for less fuel.
or
B. Should the turbo boost be decreased also.
or
C. A little of both.
I' guessing C.

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Bob/Ont

03-21-2005 10:45:24




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 Re: Repower HP in reply to Big C, 03-21-2005 09:57:41  
BigC,the turbo is driven by exhaust heat not flow.The more fuel injected and burned the more heat and the faster the turbo spins. The turbo speed is relative to the amount of air forced into the intake manifold and the Boost pressure. Turning down the fuel will reduce Max Hp and the reduced fuel will result in less boost with out doing anything to the turbo. A worn out engine has a lot of blowby and that is heat going into the oil pan, not the exh manifold. That heat lost will reduce the turbo speed too.
Later Bob

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