Re: Lugging a Gasoline engine

Posted by bbott on April 14, 2002 at 10:22:01 from (206.13.45.146):

In Reply to: Lugging a Gasoline engine posted by FM on April 14, 2002 at 09:31:49:

Well, here's what I was taught...

When under load, both engine types should be run at the proper (designed) point in their RPM ranges. This is especially true for 'traditional' engines without electronic controls.

This point of greatest effeciency usually lies in the RPM band between the torque peak and the hp peak. For most older tractors, the engineers have geared the powertrain so the 540 RPM PTO speed is very close to the 'best' engine RPM.

For modern cars and trucks, the EPA mileage requirements have them wildly undergeared at freeway speeds. This works because:

1) under those conditions the engine is not operating at anywhere near its 'working' horsepower

2) the electronic engine controls have been programmed to operate this way.

Above is my 2 cts. worth. Bottom line is that on older machinery, I don't lug anything when it's 'working'.

-- bbott

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