Engine Performance - Fiberglass RV



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Old 03-30-2019, 12:16 PM   #1
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Engine Performance

I know I'll start a firestorm of controversy, but I gotta say it: The only engine performance parameter that matters is horsepower, and specifically maximum horsepower available for any specific vehicle speed. Torque, which is often mentioned, is irrelevant. (Wait for the uproar to die down). Torque at the crankshaft is different than torque on the other side of a torque-converter, is different at the output of the transmission (and selected gear), and is different than torque out of the differential. Maximum horsepower is suggestive of better performance, but horsepower available at any vehicle speed is the best measure of pulling power. 400 horsepower at 4400 rpm isn't very useful when starting out from a stop if all that is available at 1500 rpm is 130 hp. 500 ft-lbs of torque from the crankshaft isn't useful if the final gear ratio through the differential 2.2 to 1. Automatic torque converters help startup primarily because they allow an engine to rev up to higher rpm = more horsepower.

All the talk about V6 vs. V8 and crankshaft torque misses the real point: given two vehicles of same weight with different engines, the vehicle with more pulling power at any given speed will be the one producing more horsepower at that speed. Torque alone, rpm alone, gear ratios are related but in the end it's available horsepower for a given vehicle speed.

Let the arguing begin.
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Old 03-30-2019, 01:25 PM   #2
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So the 2018 2500 Dodge truck with a 5.7 l hemi at 383 hp is a better tug than the 370 hp Cummins turbo diesel?
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Old 03-30-2019, 02:06 PM   #3
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Let the arguing begin.
Let's not.
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Old 03-30-2019, 02:21 PM   #4
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Please state your knowledge base, where can I read that will confirm what you say?
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Old 03-30-2019, 02:40 PM   #5
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Let's not.
Nothing to see here folks! Don't take the bait that has been clearly identified as bait.
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Old 03-30-2019, 05:22 PM   #6
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Let's not.
Exactly.

I don't see the point of the original premise, much less want to argue about it.
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Old 03-30-2019, 05:57 PM   #7
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Exactly.

I don't see the point of the original premise, much less want to argue about it.

And so it starts.
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Old 03-30-2019, 05:59 PM   #8
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And so it starts.
And gets ramped up further.
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Old 03-30-2019, 08:40 PM   #9
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Can’t fix stupid
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Old 03-30-2019, 11:52 PM   #10
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I'm busy holding my tongue as the horsepower "experts" share their views.

Now, I'm biting it to keep quiet! Chomp chomp, ouch!
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Old 03-31-2019, 07:38 AM   #11
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Can’t fix stupid
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👍 Yah think😂
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Old 03-31-2019, 08:00 AM   #12
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Can’t fix stupid
Iowa Dave
Hi: Iowa Dave... FWIW...Thork's thowe thare whou phull thep howl aphter whou phit tit!!! (Thounge in phcheque)
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Old 03-31-2019, 08:44 AM   #13
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Hi: Iowa Dave... FWIW...Thork's thowe thare whou phull thep howl aphter whou phit tit!!! (Thounge in phcheque)
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Thank you ; finally a post that makes sense
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Old 03-31-2019, 09:09 AM   #14
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