Go BottomHigh altitude power requirements
 | kriegba
Join Date: Dec 2004 Posts: 3 Gilpin County, Colorado 
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2005-03-22 108573
I’ve been working with a dealer on a tractor for maintaining a 0.5 mile road at 9000 feet. I need to grade the road and do snow removal. Do I need a turbo at that altitude? I’ve looked at a 970, 4210 and a 4410. The dealer is saying that I should consider a 5320 because it is a turbo. Is this reasonable, or is he just trying to sell me more than I need? The tractor will come with a loader and a medium duty rear blade for grading. Any suggestions would be appreciated.
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| kriegba
Join Date: Dec 2004 Posts: 3 Gilpin County, Colorado
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2005-03-22 108577
Reread the post and noticed my dyslexia transposed the numbers. The 970 should have been a 790 and the 5320 a 3520. Sorry about the transposition. ....
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 | DRankin
Join Date: Jan 2000 Posts: 5116 Northern Nevada 
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2005-03-22 108578
No. Your dealer is not pulling your leg.
I will find my density altitude calculator tomorrow and give you the hard numbers, but for now I will hazard an educated guess and say that depending on the temperature, a normally aspirated engine will only produce about 60 percent of its rated power at that altitude.
If I were investing in a turbo, I would investigate an external oil pump.
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 | Iowafun
Join Date: Jul 2004 Posts: 955 Central Iowa 
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2005-03-23 108609
DRankin is right. I forget what the rule of thumb is that we used for snowmobiles. But 60% of rated power is in the ball-park. You may have to go bigger engines or a turbo system. 9000 feet is pretty high up.
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 | yooperpete
Join Date: Jan 2004 Posts: 1413 Northern Michigan 
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2005-03-23 108612
Isn't that somewhere near Eagle and Vail? Back a few years ago I have a brand new '95 S-10 Blazer driving through on I-70. I had it floored and couldn't get it above 45 mph.
I agree you should go with the 3520!
P.S. I always like staying at the Tivoli Lodge in Vail Village. ....
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