Why exactly does horsepower and torque drop from the flywheel to the wheels? Like B18B's have 142 horsepower, and 127 torque, but at the wheels they drop to like 120 something and like 110 torque. I know this prob is a weird question, but I was just wondering why it drops.

 

energy is lost in the form of heat. friction between moving surfaces gives off heat, which is part of the energy (horsepower/torque) that the engine is creating.

also, i would imagine the fact that you're torqing a larger object (wheels) as opposed to a flywheel makes a difference. it's harder (takes more energy) to rotate a wheel and tire than it does to rotate the flywheel.

this is all just what i would assume in theory. somebody give him the right answer if i'm wrong .


Modified by zomart at 6:55 AM 12/6/2003

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by zomart &raquo;</TD></TR><TR><TD CLASS="quote">energy is lost in the form of heat. friction between moving surfaces gives off heat, which is part of the energy (horsepower/torque) that the engine is creating.

this is all just what i would assume in theory. somebody give him the right answer if i'm wrong .
</TD></TR></TABLE>

The easier way to say all that, which is correct, is 'drivetrain losses'.

Cheers,
Roy

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rapid_roy &raquo;</TD></TR><TR><TD CLASS="quote">

The easier way to say all that, which is correct, is 'drivetrain losses'.
</TD></TR></TABLE>
Friction losses suck.

 

Drivetrain losses vary from car to car and factors such as rotational mass and gearing play a major part. If you have a good final drive with lightweight components riding on 13" wheels low profile tires, then you would probably expect about 10% drivetrain loss. On the other hand if you are riding bone stock with a longer final drive on chrome 19's, then you can probably expect closer to 20%. Most stock Hondas lose somewhere in the neighborhood of around 14% give or take.

 

there is not a motor out there ,that doesn't lose power from the crank to wheels.
it is also called parasidic drag.no matter if you made your hole rotating assembly out of zolex "worlds lightest" metal,you would still lose power from the crank to the wheels but not as much as you would with the reg. stuff.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1700anddroping &raquo;</TD></TR><TR><TD CLASS="quote">there is not a motor out there ,that doesn't lose power from the crank to wheels.
it is also called parasidic drag.no matter if you made your hole rotating assembly out of zolex "worlds lightest" metal,you would still lose power from the crank to the wheels but not as much as you would with the reg. stuff. </TD></TR></TABLE>

This guy knows what he's talking about.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dc231 &raquo;</TD></TR><TR><TD CLASS="quote">This guy knows what he's talking about.</TD></TR></TABLE>

But he can't spell to save his life .

 

well, an electric car with 4 motors spinning 4 wheels, wouldn't have any drive train losses.
-PHiZ

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PHiZ &raquo;</TD></TR><TR><TD CLASS="quote">well, an electric car with 4 motors spinning 4 wheels, wouldn't have any drive train losses.
-PHiZ</TD></TR></TABLE>

There would be some loss in the wheel bearings

 

this to archidictus,tell me what is spelled wrong and i'll fix it.
i'm sorry if my grammer doesn't meet your standards.

 

this is to archidictus,tell me what is spelled wrong and i'll fix it.
i'm sorry if my grammer doesn't meet your standards.