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Location:
Finland
Registered:
June 2002
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Re: More Torque or more Horses ?
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Sun, 15 September 2002 00:45
 
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Norbie has it right.
It's all about keeping the engine within powerband where it works the best. We use gearing to accomplish this.
Track circuit racing. There it is possible to maintain rpm's within relatively narrow rpm window, also speed variation isn't that great. That enables engine builder to focus on engine breathing solely on this narrow rpm window. As said before, high rpm's equal high hp figures.
In rally driving (be it asphalt or gravel) the engine rpm variation is extended over a wider window. Engine has to be built to produce useable power over this required rpm window. Since engines are a summary of compromises, this will unavoidably lead into either drop in redline rpm, or at least less power delivery at redline rpm when comparing to previous engine example.
Engine suited for track work would make it not so good choise in rally driving. Despite higher hp output over the rally engine, one of the problems would be engine falling outside 'sweet operating range' when shifting to higher gear. (Rally cars have a touch wider spacing in close ratio gearing than a track car does). To what I've heard, such engine is difficult to drive. As the engine is 'stumbling' after a gear change, there is no power rush what driver is demanding. Only after waiting a moment as the engine climes up the rpm band, it will liven up suddenly, delivering all the grunt it can muster. On a gravel surface that is undesireable feature.
In this respect the old saying on torque winning races holds ground.
The answer is to decide what your rpm range requirement is and optimising the engine/drivetrain components exactly on that band.
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| | Subject | Poster | Date |
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More Torque or more Horses ?
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Les | Thu, 12 September 2002 23:15 |
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Re: More Torque or more Horses ?
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TurboRG | Thu, 12 September 2002 23:49 |
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Re: More Torque or more Horses ?
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E30-323ti | Fri, 13 September 2002 00:16 |
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Re: More Torque or more Horses ?
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Norbie | Fri, 13 September 2002 00:31 |
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Re: More Torque or more Horses ?
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GIN51E | Fri, 13 September 2002 01:13 |
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Re: More Torque or more Horses ?
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Corvid | Fri, 13 September 2002 01:26 |
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Re: More Torque or more Horses ?
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kassma | Fri, 13 September 2002 02:33 |
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Re: More Torque or more Horses ?
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Les | Fri, 13 September 2002 04:15 |
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Re: More Torque or more Horses ?
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Stefan | Fri, 13 September 2002 05:12 |
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Re: More Torque or more Horses ?
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Norbie | Fri, 13 September 2002 06:03 |
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Re: More Torque or more Horses ?
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Stefan | Sat, 14 September 2002 13:49 |
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Re: More Torque or more Horses ?
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Stefan | Fri, 13 September 2002 05:09 |
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Re: More Torque or more Horses ?
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Norbie | Fri, 13 September 2002 06:01 |
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Re: More Torque or more Horses ?
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Seadog | Fri, 13 September 2002 06:10 |
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Re: More Torque or more Horses ?
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justcallmefrank | Fri, 13 September 2002 06:52 |
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Re: More Torque or more Horses ?
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Blown86 | Fri, 13 September 2002 18:37 |
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Re: More Torque or more Horses ?
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mrshin | Sat, 14 September 2002 12:09 |
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Re: More Torque or more Horses ?
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mrshin | Sat, 14 September 2002 12:11 |
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Re: More Torque or more Horses ?
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mrshin | Sat, 14 September 2002 12:14 |
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Re: More Torque or more Horses ?
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Norbie | Sat, 14 September 2002 23:40 |
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Re: More Torque or more Horses ?
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5KinKP60 | Sun, 15 September 2002 00:45 |
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Re: More Torque or more Horses ?
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GIN51E | Sun, 15 September 2002 08:36 |
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Re: More Torque or more Horses ?
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Fattony | Sun, 15 September 2002 02:28 |
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Re: More Torque or more Horses ?
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Jonny2TG | Sun, 15 September 2002 07:41 |
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Re: More Torque or more Horses ?
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celicamad85 | Sun, 15 September 2002 12:03 |
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Re: More Torque or more Horses ?
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mattc | Tue, 17 September 2002 01:56 |
