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06-26-2005, 12:35 AM
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#1
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Montana Fan
Join Date: Jan 2003
Location: Harrodsburg
Posts: 191
M.O.C. #93
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10,000 Ft Elevation
I am not sure how to put into words what I want to ask, but here goes.
We will be traveling in the mountians where the elevation is 8,000 ft or greater. I beleive the air has an effect on your vehicle's engine. Am I correct? What is this called. Do I need to do something special to my truck prior to taking this trip?
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06-26-2005, 01:51 AM
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#2
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Montana Master
Join Date: Jan 2004
Location: St. John
Posts: 591
M.O.C. #800
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Bryan: What you need to remember is that the manufactures horsepower ratings on engines are at sea level and at 5200 RPM's or thereabouts. Any deviation from that and the numbers drop. I'm not sure what the numbers are on the 8.1 but I've put a site on here that you can fill in the blanks to 10,000 ft. and see your results. http://www.slowgt.com/Calc2.htm#BasAltCal 
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06-26-2005, 02:00 AM
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#3
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Montana Fan
Join Date: Jan 2003
Location: Harrodsburg
Posts: 191
M.O.C. #93
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Quote:
quote:Originally posted by Bob Pasternak
Bryan: What you need to remember is that the manufactures horsepower ratings on engines are at sea level and at 5200 RPM's or thereabouts. Any deviation from that and the numbers drop. I'm not sure what the numbers are on the 8.1 but I've put a site on here that you can fill in the blanks to 10,000 ft. and see your results. http://www.slowgt.com/Calc2.htm#BasAltCal
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Thank you.........
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06-26-2005, 02:17 AM
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#4
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Montana Master
Join Date: Jan 2004
Location: St. John
Posts: 591
M.O.C. #800
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Bryan; I forgot to mention these numbers are for naturally aspirated engines. Turbo/supercharged engines won't lose as much. 
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06-26-2005, 05:34 AM
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#5
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Montana Master
Join Date: Nov 2002
Location: Oceanside
Posts: 20,028
M.O.C. #20
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Bryan, as Bob said, normally aspirated engines are affected far more than turbocharged/supercharged engines. Also, carbureted engines are affected far more than fuel injected engines. We've been over 11k feet with our Montana in tow with both a gas V10 (fuel injected but not turbo) and a turbocharged diesel. The elevation and the grade to reach that elevation will likely slow you down, possibly considerably but you'll get over the top just fine, although I don't know what engine/axle you're using so maybe I shouldn't say that. Even if carbureted, you might be fine, depending on the engine and gearing. Just my opinion, though.
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06-26-2005, 05:43 AM
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#6
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Montana Master
Join Date: Nov 2002
Location: Weatherford
Posts: 1,383
M.O.C. #9
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What memories this brings back !! Having the old vehicle's carburetor adjusted before going into the mountains and then when we got back - all to save a few gallons (or pints) of precious 29 cents per gallon gasoline !! Ahhhh - the "good old days" !!
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06-27-2005, 05:48 PM
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#7
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Montana Master
Join Date: Feb 2003
Location:
Posts: 642
M.O.C. #139
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Bandj,
As VanMan said making changes for high altitude was the good old days. Modern vehicles have pressure sensors and engine computers that optimize the engine for maximum performance (or minimum polution) at any altitude.
Glenn
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06-28-2005, 05:42 PM
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#8
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Montana Master
Join Date: Nov 2003
Location: Santa Fe Springs
Posts: 4,189
M.O.C. #639
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I agree with KK and GB, when we went to higer elevations I got better fuel milage and the truck seemed to work better also.
__________________
Pulling a 2004, 2980 RL an oldie but goodie.
Tow vehicle is a 2009 RED RAM 3500 DRW.
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