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TORQUE not BHP

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disco-v8:
ok nearly every one out that who wants more power out of there car always asks how can they get more BHP out of there engine, when down to it its torque thats the thing you realy want...... basicaly BHP is a made up number and doesnt make any differnce what  they say an engines BHP is to me, as BHP is worked out from the torque figure anyway!!!!!!

every 1 i hear or everything i read tells you how to get more BHP from an engine, but who the hell wants BHP in a landrover?????  :? dont no about you lot but when im offroading i dont want to push my engine to 5000RPM to get the so called BHP figure out of it, i want low down grunt!!!!!

some placies that ive seen uprated cams from, show that they do torque cams and then high BHP cams, but what differences in the cam make more torque?????

i konw to have more BHP alot of ignition timing is done and the inlet and outlet valves are usualy over lapped so the exhaust pulls in the inlet....

BUT HOW DO YOU GET MORE TORQUE, and what things are done to engines to get this I.E. what fueling set up, ignition timing, cams exhaust ETC

lambert:
Two ideas.
 
One. Tubular exhaust manifold with long equal length primary's. Each engine has an optimum.
 
Two. Heavier or more mass on the fly wheel. No more torque as such but it will keep spinning better at low engine speed. Again there is an upper limit to keep run on acceptable.

disco-v8:
missinng the point with that one there mate.... im not trying to get more torque or power, and not trying to find out whats the best way of dog it!!!!

im merrly trying to find out what is done to an engine to get higher torque instaead of higher BHP, basicaly wot factors are diffenent between the two????

lambert:
Ok.
 
Power is not a metric parameter it is merely a function of torque. The difference is where they occur in the rev range. At 5225 rpm or there abouts they are equal. More torque is found lower down power higher up the rev band.
 There for it is a matter of where the max revs are found.
 
That is probably no help as i have now confused my self. But then it is a tad complicated to explain.

rollazuki:
Torque is a measure of work done, ie 1 pound foot is the ability to lift 1 pound with a leverage of 1 foot.
BHP (power) is a measurement of the speed that the work is done. Ie an engine that lifts the pound in half a second is more powerful than one which takes 1 second, but technically the torque produced is the same.

The two engines you describe are like chalk and cheese, there are major differences. to take two examples, use a buss engine and a race car engine. Bus engine produces all its torque at low revs, so lasts for ever, its designed for maximum air flow to be at low revs etc, and will be highly inefficient at higher revs. Its likely to have a low compression ratio, big heavy(reliable) pistons, large valves(only two) and a cam with a very mild open/close curve, and little overlap to make it efficient.
The inlet passages will be narrow, and probably poorly finished., no real need to spend cash in this area.

The race engine will be the opposite, light valves, and many of em, a high lift cam with long overlap(who cares about fuel wastage, its a race engine), lightweight pistons and rings(short life), an immaculately finished inlet and exhaust tract, and a very high compression, neccesitating the use of higher octane fuel, with good anti knock properties.

The two are miles apart.

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