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12-18-2002, 10:18 AM
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CC Member
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Join Date: Feb 1999
Location: Kansas City,
MO
Cobra Make, Engine: CRL, 351W, Tremec TKO
Posts: 2,299
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Not Ranked
Hmmm... we're talking about a rate of change. The greater the rate of change, the greater the horsepower.
So, let's say that the frictional losses are equal at a steady state rpm, no matter what the horsepower. Now change the rpm. Let's say from 1000 to 5000. The higher hp engine generates a faster rate of change than the lower hp engine. But both encounter the same amount of friction ... only over different periods of time, the high hp engine doing it's work to overcome the friction over a much shorter period of time.
I've a feeling that it's the shorter period of time that would show up as an increase in frictional losses. Just a guess.
__________________
Pete K.
Who is John Galt?
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12-18-2002, 01:42 PM
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Senior Club Cobra Member
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Join Date: Jul 2002
Cobra Make, Engine:
Posts: 15,712
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Not Ranked
Petek,
Whoa,,,,that might be it! Frictionall losses WOULD be higher when the "time" was decreased to achieve a set rpm. The "faster" you spin it up, the more it will "resist". Gear weight inertia, friction of the "teeth" losses, gear oil, all kinds of things would come into play with "time" factored in.
Rule of thumb: 1 pound of rotational weight is worth 3 pounds of static weight. Lighten your tire wheel combination by one pound will have the same effect as lighten the body weight by 3 pounds!
Ernie |
12-18-2002, 03:03 PM
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CC Member
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Join Date: Apr 2002
Location: Alpharetta,
GA
Cobra Make, Engine: Sold - Unique FIA - SA 396 Stroker
Posts: 2,440
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Not Ranked
I give up  spinning masses, frictional losses, redmist, you name it - I just wanna mash the gas and haul ass 
Randy
__________________
Sold the Unique - Bought a Porsche TT - Sold the TT - Bought a truck
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12-18-2002, 03:12 PM
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CC Member
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Join Date: Aug 2000
Location: Chicago,
IL
Cobra Make, Engine: ERA 454 S.O.
Posts: 1,684
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Not Ranked
Use a chassis dyno as a tunning aid. Many people pick up 30-40 hp just by tunning their car on the dyno.
Again, the higher the hp, the less the losses. There was an article in one of the hot rod type mags. that had an engine that made 850 fwhp and only lost 10% at the rear wheels.
__________________
Jeff
“If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough horsepower.”
Mark Donahue
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12-18-2002, 04:03 PM
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Senior Club Cobra Member
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Join Date: Jul 2002
Cobra Make, Engine:
Posts: 15,712
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Not Ranked
Georgiasnake,,,,,right on dude! lol
Ernie
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04-09-2007, 04:18 PM
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CC Member
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Join Date: Apr 2007
Location: Mechanicsburg,
pa
Cobra Make, Engine: 1996 Cobra 306 na 430Hp to the tire
Posts: 1
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Not Ranked
Hi yes there are many variables 20-30 percent is average. But sometimes as hp increases so does loss due to inertia losses witch includes anything in the driveline. To back this claim if you ask anybody that runs an engine dyno they program rate of accel common rates are 150 rpm and 300rpm
per second the faster rate I've seen show as much as 20 flywheel hp less. Hope this helps.
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