how to - basic understanding of auto torque and horsepower - torque versus horsepower

how to - basic understanding of auto torque and horsepower - torque versus horsepower

Category:

Autos & Vehicles

[ramentasty8]

so is horsepower dependent on rpm? or the ratio with rpm and torque?

[chughes374]

@ramentasty8 I dunno, ask 'davidsfarmlives' and link to this video

[Seattlecarnut]

How the hell was David able to make videos? I thought his videos were removed from You Tube?

[chughes374]

@Seattlecarnut Because he's awesome. His old videos were re-uploaded by third parties. chughes376 and davidsfarmfans. His new channel is davidsfarmlives (with new videos)

[Dillon1791]

I had no idea it was going to be David! ::Faints::

[chughes374]

@Dillon1791 his new channel is 'davidsfarmlives' . My channel is just a re-uplaoad

[jvanegas14]

@ramentasty8 torque times (rpm/5252)= horsepower, for a conventional engine.

[MoronAntidote]

@177SCmaro

Btw i had no intention of getting into this kind of argument. I drive a stock e46 330i and i appreciate it. I have no desire to get caught up in arguments about particular engines, but as an engineer, i get frustrated by all the bullshit about torque vs horsepower. That's the only reason i posted tbh.

[MoronAntidote]

@177SCmaro

I appreciate your enthusiasm, but what we're talking about is increased peak power vs average power over time. Yes, you could achieve the same longevity as a stock engine if you were careful, but people who build engines in this way do so because they enjoy the thrill of acceleration. I'll accept it's well built and tuned, but i'll wager my left leg you boot it enough to 'on average' stress the engine greater than a stock engine could be stressed. I would, so why argue?

[177SCmaro]

@MoronAntidote You build them right and they last as long as intended. Besides, a engine isn't running boost all the time. For example, my supercharged 383 spends 99% of its time cruising around as a 8.75 to 1 low stress motor. With low boost it makes around 500HP. Compare that to runing around town with a high compression/rpm NA 383 with the same HP and I promise you my SC 383 would live longer. (And is a hell of a lot more streetable too!)

[MoronAntidote]

@Seattlecarnut

You do realise that gearboxes and final drives modify the engine torque don't you?

I suspect not, and this is one of the main reasons why people can't grasp the torque/horsepower thing. This video doesn't help at all, because it's trying to explain something in words which is best explained mathematically. Once you see the math it all becomes clear. I don't think you get it right now.

[MoronAntidote]

@177SCmaro

Great for any engine up to a point. But let's not pretend they'll last as long as intended ;)

[MoronAntidote]

@Seattlecarnut

Power to weight ratio is the best indicator of acceleration, given appropriate gearing.

Torque means nothing by itself. Power at a given rpm is the size of the pie. The gearing determines how you divide up the pie. You basically trade torque (acceleration) for speed in that gear. Either way, the bigger the pie the better, so power wins.

[MoronAntidote]

@Seattlecarnut

Wheel torque determines acceleration, not engine torque.

Low revving engines requires taller gearing, which reduces wheel torque.

If you made that engine produce its torque over a wider rpm range, you could use shorter gearing, and produce more wheel torque.

[177SCmaro]

@MoronAntidote Great for a 383 Chevy too.