Fabguy
Auburn, Washigton
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Joined: 03/29/2002
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I just took this pic last Saturday...
At the highest elevation on our way to the our picnic spot for the day..
80* outside and STILL a bunch of snow....
So... Yeah... I don't know jack about towing in elevation.
Jeff
2002 GMC Sierra 2500HD 8.1/Allison/4:10/Prodigy brake controler/Dual Cam HP
Pulling a 2004 Sprinter 274 RLS
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blt2ski
Kirkland, Wa
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Me thinks there should be a lake in that thar pic of Mt rainer in the back ground.....where I stood at the top of about 26 yrs ago on the 2nd of july! I have pulled a trailer over chinook! not too bad, but yes, anything over 35 or so is a death wish! >25 going down would be a death wish too! Altho not the worst twisty turny road I have been on. that would be the pass going north?!?! IIRC from sundance ski area into the great salt lake basin in Utah. Talk about a fun hwy. Especially when you have 1.5 lanes, and 30 some odd 15-20 passenger vans coming the other way on a tour of some sorty! just a few white nuckles during that trip.
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Fabguy
Auburn, Washigton
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Turtle n Peeps wrote:
Octane rating has nothing to do with loss of power. In fact the higher you go the less octane you need. Even nitro cars loose power at Mile High. Talk to a Pro Stock dude and he will really tell you about power loss. 
Can you post a link to support this statement?
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Fabguy
Auburn, Washigton
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blt2ski wrote:Me thinks there should be a lake in that thar pic of Mt rainer in the back ground.....where I stood at the top of about 26 yrs ago on the 2nd of july! I have pulled a trailer over chinook! not too bad, but yes, anything over 35 or so is a death wish! >25 going down would be a death wish too! Altho not the worst twisty turny road I have been on. that would be the pass going north?!?! IIRC from sundance ski area into the great salt lake basin in Utah. Talk about a fun hwy. Especially when you have 1.5 lanes, and 30 some odd 15-20 passenger vans coming the other way on a tour of some sorty! just a few white nuckles during that trip.
Look at it Marty... It was taken on the SOUTH side... From the overlook at Reflection Lakes..
AND... We just spent a couple of nights at Soda Springs campground a couple of weeks ago....
Rained all weekend... But it was still BEAUTIFUL!
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Gale Hawkins
Murray, KY
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Joined: 07/22/2007
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Turtle n Peeps wrote:Gale Hawkins wrote:I am guessing our 20 year old 454 TBI after 100,000 miles is making a bit less than the OEM 230 rated HP today. Not sure I would call it over powered for the 15,000 loaded weight.
I do understand your theoretical physics from college. Some of us from pratical experience question these theoretical losses. I do know our 454 TBI makes more power on 93 octane vs 87 and it gets improved MPG for the said reason I expect.
Maybe your snow mobile example turns faster than 4,000 RPM hence the 18% theoretical lost?
Here is something to play with Gale.
It's fun to see what altitude will do to an engine. And shocking at the same time. 
Turtle is is just to boxes to fill so it gives no info to know if it is valid for towing applications. Something like this is not helpful to what this tread is discussing. You need to understand towing set ups and racing set ups are very different. One goes for torque and the other for HP. Cubic feet of air intake per minute can be VERY different for these two types of gas engines.
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blt2ski
Kirkland, Wa
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hmmmmm it is from the south side, still, shouldn't there be a lake in that thar pic!?!?!?!? oh, wait a minute, you is hiding the lake under that thar icey stuff......ok, got it..........
I should find the pic I have on the west side, taken about 9pm, complete red glow off the puyallup glacier from the top to bottom, with a marmot sticking its head out of its hole! what shot, never happen again in a million years. I was on the wonderland trail at the time.
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Turtle n Peeps
California
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Joined: 06/23/2008
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Fabguy wrote:Turtle n Peeps wrote:
Octane rating has nothing to do with loss of power. In fact the higher you go the less octane you need. Even nitro cars loose power at Mile High. Talk to a Pro Stock dude and he will really tell you about power loss.
Can you post a link to support this statement? Here you go.
~ Too many freaks & not enough circuses ~
"Life is not tried ~ it is merely survived ~ if you're standing
outside the fire"
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Gale Hawkins
Murray, KY
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Sorry not into snow mobiles. I have a 1992 454 TBI that makes more power on 93 octane than 87 for some reason.
By the way is max RPM about 4500 RPM for the fastest snow mobiles?
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Turtle n Peeps
California
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Gale Hawkins wrote:Turtle n Peeps wrote:Gale Hawkins wrote:I am guessing our 20 year old 454 TBI after 100,000 miles is making a bit less than the OEM 230 rated HP today. Not sure I would call it over powered for the 15,000 loaded weight.
I do understand your theoretical physics from college. Some of us from pratical experience question these theoretical losses. I do know our 454 TBI makes more power on 93 octane vs 87 and it gets improved MPG for the said reason I expect.
Maybe your snow mobile example turns faster than 4,000 RPM hence the 18% theoretical lost?
Here is something to play with Gale.
It's fun to see what altitude will do to an engine. And shocking at the same time.
Turtle is is just to boxes to fill so it gives no info to know if it is valid for towing applications. Something like this is not helpful to what this tread is discussing. You need to understand towing set ups and racing set ups are very different. One goes for torque and the other for HP. Cubic feet of air intake per minute can be VERY different for these two types of gas engines.
An engine is an engine is an engine. Towing, racing, pulling, it does not matter.
As far as towing and racing is very different; that is not true at all. Torque is an actual measurement. HP is mathmatical calculation of torque and time.
One can have a million ft/lbs of torque and 1 HP. That won't be very good for towing. I can gear or stroke an engine to get tons of torque but it is very hard to make tons of HP because it is time based. An engine with tons of torque and very little HP makes a very poor towing engine. I know, I have a 6.5 diesel with 440 ft/lbs of torque and only 200 HP. It tows ok but it is no killer tow vehical just because it has lots of torque. It needs more HP so it won't crawl up hills.
There is a lot of misconception about engines around here.
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Turtle n Peeps
California
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The link I gave you has nothing to do with snowmobiles. It is a know forumla for power loss at altitude.
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