What makes more torque available at lower rpm?

Question

I need to know the elements in engine design that can make more torque available in the lower rpm, and how to produce a high linear torque curve such as those available in the Bentley Arnage T?

That is, without compromising the torque availability in the higher RPM.

Answer 1

There's almost always compromises.

This is a little known fact but getting overall smaller diameter tires (or tires & rims) has the same affect as the more expensive and permanent low gearing. The only trade off is the lower top speed.

One cars with 20 inch diameter tires (10 inch radius), lowering the car tires by just 1 inch will improve the torque AND hp by 10%. You can't bet better deal than that.

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It is not exactly what you asked, but you should know.


Good Luck

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Answer 2

High torque is produced in an engine by having a long overlap on valve timing so the charge is trapped inside the cylinder for longer. This is not good however for power at high revs, so what is done today is to have variable valve timing to have this long overlap at low speeds and short at high speeds, giving the best of both worlds.

Answer 3

choice of gear ratios

Answer 4

get one of those monster trucks