[Shotimes] Dyno charts

[Ron Childs]

Imagine an engine with a broad torque curve e.g. 200 lb.-ft. from 1500 rpm 
to 5000 rpm. The engine would produce triple the horsepower at 4500 than it 
would at 1500 rpm, even though the torque is the same. This imaginary engine 
would only have 57 hp at 1500 rpm (which may be the torque peak) but 170 hp 
at 4500 if torque dropped to say 199. 57 hp is 57 hp, no matter what your 
torque is.

-Ron Childs



>From: "Ron Porter" <ronporter@prodigy.net>
>To: <shotimes@autox.team.net>
>Subject: RE: [Shotimes] Dyno charts
>Date: Fri, 17 Jan 2003 12:56:06 -0500
>
>In the situation of a CVT, running the engine at peak torque would be the
>best solution, I believe. Peak torque is where the engine is running most
>efficiently. Gearing can handle where the speeds should fall. Much like a
>diesel, they're geared for the lower operating rpm.
>
>Ron Porter
>
>-----Original Message-----
>From: shotimes-admin@autox.team.net
>[mailto:shotimes-admin@autox.team.net]On Behalf Of Ron Childs
>Sent: Thursday, January 16, 2003 11:16 AM
>To: shotimes@autox.team.net
>Subject: RE: [Shotimes] Dyno charts
>
>
>Several cars now, and more to come have CVTs, Continuously Variable
>Transmissions. Although their behaviour depends on programming, the ideal
>for performance is to let the engine rev to peak hp and the tranny will
>adjust and accelerate the car. Wide torque band no longer needed.
>
>-Ron Childs  '91
>
>
> >From: "Ron Porter" <ronporter@prodigy.net>
> >
> >I agree with your final conclusion, but I don't agree that the amount of
> >horsepower is "most important"
> >
> >In reality, horsepower doesn't exist. It is a math formula to show how 
>much
> >work is done over time. Torque is a real force, and the horsepower
> >calculation shows how much work that torque can do.
> >
> >Let's look at Ransom's example: a lawnmower producing 220 HP at 150K rpm,
> >or
> >a SHO motor producing 220 HP at 6K rpm. They technically producing the 
>same
> >amount of work at their peaks, but engines don't only run at their power
> >peaks.
>
>
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