I dont think thats right, torque can be anywhere in the rev range. Mine produces 320lbsft at aroung 4k rpm, a derv would produce similar much lower down as you suggest.
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could someone explain.....
- Thread starter matt hartas
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I dont think thats right, torque can be anywhere in the rev range. Mine produces 320lbsft at aroung 4k rpm, a derv would produce similar much lower down as you suggest.
People generally say an engine is "torquey" when it produces a lot of torque from low RPM's and over a wide range of RPM, so that at whatever rpm you put your foot down the car accelerates straight away. An example would be a big 5 litre V8, or a turbo charged engine like our 1.8T's.
An example of a "non torquey" engine would be the high revving honda vtec engines that have to be at 5000rpm+ before you get any decent performance out of them.
An example of a "non torquey" engine would be the high revving honda vtec engines that have to be at 5000rpm+ before you get any decent performance out of them.
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Diesels are often described as "torquey", by which most seem to mean it pulls away from the traffic lights well.
Comparing engines of roughly the same displacement, my 1.9 TDI 150 has more torque at 2000 rpm than an LCR does at the same rpm, 236 lb-ft vs 207 for the LCR. But please note that means I have *more power* than the LCR at 2000 rpm - remember the equation? I've got 90 BHP there, the LCR has 79. So, as a consequence of having more torque, I have more low-down power than the LCR.
Comparing the diesel to the petrol engine, the diesel makes a bigger bang, which means more torque, as I said earlier. If you want to go further into it, the diesel has a higher compression ratio, produces a higher BMEP, so pushes the crank round harder.
Diesels can't be made to produce more torque above about 4000-4500 rpm. You can chuck lots more fuel in and keep things spinning, but most of the fuel disappears out the back as smoke, the torque drops off and people tend to point and say rude things. The petrol engine has no such limit and can carry on producing torque up to quite ear-splitting rpm if you pay enough attention to balancing everything, keeping the valves from bouncing and keeping the fuel and gas flow stable.
If you remember the equation, power = torque x rpm, then as long as the torque curve keeps rising or at least stays flat as rpm increase, so does power. So your blueprinted, well-balanced petrol engine can put out a very high maximum BHP figure at its fastest rpm.
The LCR produces its 225 BHP at 5900 rpm, making 200 lb-ft of torque. The TDI 150 gives its 150 BHP at 4000 rpm, making - - - 200 lb-ft of torque. It's the ability of the petrol engine to rev higher and still produce torque that lets them produce higher BHP than a similar capacity diesel.
Being partisan for just a moment, the diesel's extra power at low revs makes it more drivable in day-to-day use where you very rarely reach maximum rpm.
Comparing engines of roughly the same displacement, my 1.9 TDI 150 has more torque at 2000 rpm than an LCR does at the same rpm, 236 lb-ft vs 207 for the LCR. But please note that means I have *more power* than the LCR at 2000 rpm - remember the equation? I've got 90 BHP there, the LCR has 79. So, as a consequence of having more torque, I have more low-down power than the LCR.
Comparing the diesel to the petrol engine, the diesel makes a bigger bang, which means more torque, as I said earlier. If you want to go further into it, the diesel has a higher compression ratio, produces a higher BMEP, so pushes the crank round harder.
Diesels can't be made to produce more torque above about 4000-4500 rpm. You can chuck lots more fuel in and keep things spinning, but most of the fuel disappears out the back as smoke, the torque drops off and people tend to point and say rude things. The petrol engine has no such limit and can carry on producing torque up to quite ear-splitting rpm if you pay enough attention to balancing everything, keeping the valves from bouncing and keeping the fuel and gas flow stable.
If you remember the equation, power = torque x rpm, then as long as the torque curve keeps rising or at least stays flat as rpm increase, so does power. So your blueprinted, well-balanced petrol engine can put out a very high maximum BHP figure at its fastest rpm.
The LCR produces its 225 BHP at 5900 rpm, making 200 lb-ft of torque. The TDI 150 gives its 150 BHP at 4000 rpm, making - - - 200 lb-ft of torque. It's the ability of the petrol engine to rev higher and still produce torque that lets them produce higher BHP than a similar capacity diesel.
Being partisan for just a moment, the diesel's extra power at low revs makes it more drivable in day-to-day use where you very rarely reach maximum rpm.
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thats the main reason why people use lbs/ft as opposed to Nm because its easier for 'joe public' to understand. alot of people myself included seem to mix and match with the whole imperial/metric measurements.
its really funny when you realize that all food supermarkets sell food in kilogram weights, for instance they sell a 1Kg bag of potatoes but this is completely incorrect as weight is measured in Newtons(N), mass is actually measured in Kilogram(Kg) and it is the earths gravitational acceleration of 9.81m/s2<(couldnt find the squared symbol lol) that specifies its weight. so in actual fact a bag of potatoes actually weighs :- 9.80665002864N LOL
next time you go to the butchers ask for your meat in Newtons and watch as the blank expression on his face quickly develops
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Not my point mate.
Yes torque CAN be at any point in the rev range, BUT my point was....
Power = torque x revs
So to be powerful at low revs, the engine has to be a torquey engine.
Otherwise, low revs x low torque = low power = slow at low revs.
It makes sense, I'm just not one of lifes natural teachers
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