Which Is Faster - 600hp@6200 or 600hp@7100

General engine tech -- Drag Racing to Circle Track

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pastry_chef
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Re: Which Is Faster

Post by pastry_chef » Wed Sep 20, 2017 12:56 am

cgarb wrote:What accelerates an electric car?
Electromagnetic force
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Re: Which Is Faster

Post by The Radius Kid » Wed Sep 20, 2017 1:01 am

pastry_chef wrote:
cgarb wrote:What accelerates an electric car?
Electromagnetic force
Electromagnetic twisting force....or torque.
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digger
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Re: Which Is Faster

Post by digger » Wed Sep 20, 2017 1:19 am

Actually it's the net tractive force which is the same as a car with internal combustion engine coincidentally

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Re: Which Is Faster

Post by joe 90 » Wed Sep 20, 2017 1:56 am

It's the fuel that makes it all work.

Rate of burning fuel.
It's directly related to HP.

Or in the case of an electric car, the rate of converting electrical energy into mechanical energy.




Ahhhhhh gone full circle already......again.

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Re: Which Is Faster

Post by kirkwoodken » Wed Sep 20, 2017 2:01 am

I was taught only three ways to make HP in IC engines: decrease friction, ie pumping losses, raise BMEP, or raise RPM. Raising RPM is the easiest. I'd go with the higher RPM engine.
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Re: Which Is Faster

Post by gvx » Wed Sep 20, 2017 4:03 am

kirkwoodken wrote:I was taught only three ways to make HP in IC engines: decrease friction, ie pumping losses, raise BMEP, or raise RPM. Raising RPM is the easiest. I'd go with the higher RPM engine.
You mean increasing horsepower? Or actually making it?
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Re: Which Is Faster

Post by Arthur » Wed Sep 20, 2017 4:31 am

Think of it as releasing the fuels energy while minimizing losses.
No one makes power that is not there.

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Re: Which Is Faster

Post by gvx » Wed Sep 20, 2017 4:43 am

pastry_chef wrote:
cgarb wrote:What accelerates an electric car?
Electromagnetic force
pastry_chef wrote:
gvx wrote:You dont get it. Without torque you dont have horsepower.
NOPE.
Torque is NOT the source of HP.
Cylinder pressure is!

Not factoring for aero, parasitic driveline or rolling resistance. Irrelevant to the argument.
Acceleration can be obtained from cylinder pressure, bore area, piston speed, drive wheel speed and vehicle weight.
Increasing the first three will improve acceleration. The higher the last two are the acceleration goes down.
No torque, no gears, no BS in the mix.
torque
tôrk/
noun
1.
MECHANICS
a twisting force that tends to cause rotation.
2.
variant spelling of torc.

horse-pow-er
ˈhôrsˌpou(ə)r/Submit
noun
a unit of power equal to 550 foot-pounds applied per second (745.7 watts).

Torque is a relative measurement. Horsepower is abstract, it is a measurement of work applied over a period of time.
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pastry_chef
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Re: Which Is Faster

Post by pastry_chef » Wed Sep 20, 2017 9:31 am

gvx wrote: ˈhôrsˌpou(ə)r/Submit
noun
a unit of power equal to 550 foot-pounds applied per second (745.7 watts).
Beyond that narrow perspective:
https://www.grc.nasa.gov/www/k-12/airplane/ottoa.html

Look to cylinder pressure when thinking about torque and horsepower.
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Re: Which Is Faster

Post by turdwilly » Wed Sep 20, 2017 4:47 pm

cgarb wrote:What accelerates an electric car?
Horsepower. Key word there is "accelerates". HP by definition is the amount of time it takes to move an object of a specific weight over a specified distance. (translation - acceleration) Torque is force without time involved. Acceleration involves both force & time. See definiton of horsepower below.

horsepower
image: http://cf.ydcdn.net/1.0.1.81/images/dic ... sters5.jpg


the power exerted by a horse in pulling
pl. -·pow·er a basic unit of power in the FPS system, equal to the power needed to raise a weight of 550 pounds a distance of 1 foot in 1 second or a weight of 33,000 pounds a distance of 1 foot in 1 minute

Read more at http://www.yourdictionary.com/horsepowe ... YGWx7IH.99

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Re: Which Is Faster

Post by roc » Wed Sep 20, 2017 5:14 pm

Geez, this is the lousiest HP/Tq discussion we've had in years... c'mon guys, seriously?? #-o

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Re: Which Is Faster

Post by Warp Speed » Wed Sep 20, 2017 6:54 pm

roc wrote:Geez, this is the lousiest HP/Tq discussion we've had in years... c'mon guys, seriously?? #-o
The cool thing about this is, it really isn't about That! LOL

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Re: Which Is Faster

Post by engineguyBill » Wed Sep 20, 2017 11:27 pm

Hard (impossible) to determine which of the 427's will be faster (quicker) at the dragstrip. Car weight, gearing and several other factors are of utmost importance in this matter.
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Re: Which Is Faster

Post by GARY C » Thu Sep 21, 2017 12:19 am

Yes, another useless post with no relevance and is why ST is what it is today!

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Re: Which Is Faster

Post by VMC » Fri Sep 22, 2017 3:35 pm

There's a reason the NHRA limited RPM in Pro Stock, and why you don't see 6000 rpm "truck" engines in F1.

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