| Author |
Message |
TOM (200.64.155.96)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, February 05, 2004 - 8:54 pm: | |
I have a prevost with a 8V92tt silver i just bought it in colorado at pike peek ,is it possible the air is set up different their than it would be at the coast. It's just a puff of smoke and the turbo kick in and it clears same as when you go to pass. |
Greg Corbett (Kootking) (24.70.251.188)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, February 05, 2004 - 9:06 pm: | |
What you describe sounds right for flooring the accelerator. The diesels have lag on the turbo but fairly quick reaction on the fuel rack. This causes more fuel to get into the cylinder than air, hence black smoke.
If you want a less smoke on a pass, wind up the motor slower . . .ease the accelerator down till the rpm climb up. This may even effect the pass as quick since the power is there and not flooded down. |
jim mci-9 (209.240.205.60)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, February 05, 2004 - 9:25 pm: | |
lots of things... bigger injectors... dirty air cleaners...throttle delay set incorrectly...if its set correctly, it won't get full fuel till boost is up... |
BrianMCI96A3 (69.34.169.42)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, February 05, 2004 - 9:51 pm: | |
Well, yes, the air IS diferent at Pikes Peak, it is far more dense at sea level than at that altitude.
As there is less oxygen in the air at altitude, under those circumstances an engine at altitude must be set up either to run a higher boost pressure, to pack more air into the engine, OR it must be set up to inject less fuel...
On a DDEC engine, there is what amounts to a barometer which lets the computer know what the outside air density is and will adjust the amount of fuel injected into the engine.
A non-DDEC engine that was set up properly for altitude, will actually run LEANER, or produce LESS smoke on the coast IF it is not reset for sea level operation.
If your 8V92T is a DDEC engine, it may well be that the computer, sensing the higher density air is allowing full fuel delivery to the combustion chamber.
Since there is always some unburned fuel in every combustion cycle, more fuel delivered means that while the percentage of unburned fuel will remain the same, there will be more unburnt fuel finding its way out the tail pipe.
If your engine ISN'T a DDEC, then I'm baffled that there appears to be MORE smoke at sea level.
Brian |
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