RPM's???

[84_Chevy_K10]

Re: RPM\'s???

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4500 is the factory horsepower peak and I've never seen a truck that shifted below that.

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/forums/images/graemlins/histerical.gif /forums/images/graemlins/histerical.gif /forums/images/graemlins/histerical.gif

You have to be kidding me tim /forums/images/graemlins/shame.gif...You are saying that trucks are not shifting anytime before 4500 from the factory....
I wouldnt want to ride in a truck that shifted that high..I'd end up with whiplash and be sueing GM. or deaf from the noise. /forums/images/graemlins/shame.gif

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Apparently I missed this one.

I am talking about at WOT.

Obviously TV pressure, vacuum modulator, etc will come into play for part throttle shifts with an automatic.

 

[m j]

Re: RPM\'s???

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F1 & Indy car engines can't do much work (very low torque), but they can do it very fast (high RPM HP).
OTR diesels can do a huge amount of work (lots of torque), but they can't do it very fast (comparatively).

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so would bullshit be too short an answer?

F1 and indy cars do a lot of work, GEARING. the torque is just at a higher crankshaft speed
comparing a motor with a flywheel that outwieghs an indy car to a race engine is not a valid comparison
put the diesel torque figure on a vehicle that wieghs the same and gear it to match the engine rpm and you get the same result IMO
x amount of pressure on the driveshaft = x amount of pressure on the driveshaft doesnt matter what is in front of the shaft in regards to gearing and rpm
I just helped send a vehicle to a 6.79 @ 210mph and only turned 4600 rpm peak (which is over revving it), did horsepower do that or torque?
as they are one and the same thing they both did it.

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Torque is a measurement of the engine's ability to do work, i.e. how much work it can do.
HP is the rate that it can do the work at.

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and how is horsepower measured? ah by measuring the TORQUE and hitting it with some math to add a time factor.
a motor cannot have any horsepower at zero torque.

 

[84_Chevy_K10]

Re: RPM\'s???

Yet an engine can have lots of torque and zero horsepower and net no useful work accomplished. (Electric motor at 0 RPM)

When comparing similar engines I believe horsepower to be a better comparison of the amount of work that can be done by the engine, but I also belive that the entire torque curve must be matched to the vehicle weight, stall speed, gearing, tires, etc., or it will be sluggish.