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Re: Diesel questions
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Posted by Bob M on December 16, 1999 at 10:19:28 from (192.232.120.194):
In Reply to: Diesel questions posted by MikeH(Tx) on December 16, 1999 at 08:54:53:
Diesel "knock" is not pre-ignition. It's the sound made by the first portion of the injected fuel exploding in the cylinder. When injection begins, the first bit of spray into the cylinder does not ignite immediately - it undergoes a few milliseconds of what's called ignition delay. It then ignites explosively causing the characteristic diesel sound. The remaining portion of the fuel injecting then burns smoothly as it's sprayed into the cylinder. Diesel fuel efficiency is due to 3 factors: 1 - High compression ratio. Without going into a lengthly discussion of thermodynamics, the higher the compression ratio, the higher the thermal efficiency of any engine. 2 - Higher heating value of diesel fuel. There's more enery stored in a gallon of diesel than in a gallon of gas. 3 - Less pumping losses. Diesels have no throttle valve in the intake manifold - at partial load much less energy is expended pumping combustion air from the intake manifold into the cylinder.
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