Re: Diesel vs. Gas

Posted by B.C. on November 17, 2000 at 05:03:31 from (131.167.75.193):

In Reply to: Diesel vs. Gas posted by brian on November 16, 2000 at 12:57:53:

It has to do a lot with the nature of the combustion process. In a diesel, fuel gets spritzed into hot, compressed air. Assuming that the air is hot enough, the first bit of fuel begins to burn, and it begins to burn rapidly. This causes a pressure wave that hammers at the cylinder, piston, head. The rest of the fuel then burns at a slower rate. This is why diesels tend to knock almost as loud when they idle as when they are at power.

The sharpness of the knock is somewhat modified by the design of the combustion chamber. "Precombustion chamber" designs like some older Caterpillar diesels tend to have a softer knock.

As a diesel picks up speed and under increasing load, other noise tends to mask the hammering such as cooling fans, turbocharger howl or blower scream.

In a spark ignition engine the rate of pressure rise upon setting off the fuel-air mixture is much less, unless you have a detonation problem.
Then they can get beat to junk as well.

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