High Altitudes - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 6 (permalink) Old 05-14-2009, 05:41 AM Thread Starter
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High Altitudes

I did not find an answer after searching, so I'll ask:
For a TEMPORARY time in high altitudes (Denver and west) during a trip, should I plan to do any adjustment to the running mode on my 100% manual 1997 Cummins c8.3? (in a MoHo) I am hoping that I can get by with some loss of power for a few days and just live with it - BUT if I do need to make adjustments before getting a mile-high, I need to know about it. Thanks in Advance
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post #2 of 6 (permalink) Old 05-15-2009, 02:45 AM
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Should not even see loss of power (the turbo compensates for the lack of air) except at low RPM where the turbo is not effective, but seeing as you have an automatic it should not be an issue. If you see loads of rolling black smoke in the mirror then you should back off till it clears up but I doubt it is an issue at all.

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post #3 of 6 (permalink) Old 05-15-2009, 03:27 AM Thread Starter
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Thanks for the reassurance - I'm sure the big trucks do not make motor adjustments every time they go back & forth across the USA, but I just recently read that the c8.3 should have adjustments for high altitude. I guess that is for regular use up high!!
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post #4 of 6 (permalink) Old 05-16-2009, 06:20 AM
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Normalement la plupart de réserve le diesel à moteur turbo est évalué le pouvoir bon en hausse de 10,000 pieds {3,050meter}, mais une fois que vous devenez susdits qui numérote le niveau de pouvoir diminuera de là.

Gardez juste dans votre avis l'évaluation de pouvoir(puissance) fera(sera) pour varier un peu selon ce que le manufacter coucher à et l'HP évaluant aussi.

Si vous avez l'HP très élevé l'évaluant peut affecter plus que l'HP bas évaluant le moteur {baised sur le même bloc-moteur}

Si vous avez besoin de plus de renseignements braillent juste un d'entre nous vous aidera à vous donner corrigent information dont vous avez besoin.

Normally most stock turbodiesel have rated power good up to 10,000 feet {3,050meter} but once you get above that number the power level will fall off from there.

Just keep in your mind the power rating will varies a bit depending on what the manufacter set at and the HP rating as well.

If you have very high HP rating it may affect more than low HP rating engine { baised on the same engine block }

If you need more info just holler one of us will help you to give you correct information you need.

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post #5 of 6 (permalink) Old 05-16-2009, 10:58 AM
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i think youre probably used to driving a "gasser"....the mixture (air / fuel) of
a carburated engine would benefit from adjustment but a diesel doesnt really
need that.

youll be fine....

a diesel performs BETTER w/ a "rich" (more fuel) mixture...where
a gasoline motor does the opposite.

Gasoline engines run "stronger" when theyre on the "LEAN" side (a lean gasoline
motor will get HOTTER too though), to cool a gasoline motor you add more
fuel (making it richer).

a RICH running diesel motor will build more heat (exactly opposite of a gasser), take
away the fuel & youll cool the diesel.

Keep an eye your EGT's when your in the higher altitudes and pulling the longer
grades. If the EGTs start climbing you should be able to 'regulate' the EGTs
by slightly lifting your foot slightly off the throttle.

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post #6 of 6 (permalink) Old 05-17-2009, 03:00 AM
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The newer electronic diesels just cut the fuel rate back (derate) at high altitudes. This saves the turbo from over speed (less intake loading from the thinner air) and keeps EGT's down.

You can do the same thing with your foot, just watch the egt's. I run my Cat motor from 4000' to 9000' almost daily but I'm usually conservative with the throttle up high.

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