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Old 02-04-2006, 06:25 PM   #29
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Join Date: Sep 2005
Location: Minneapolis/St. Paul, Minnesota, USA
Posts: 3,308
Originally Posted by JackG
Just a quick correction...

Retarding the spark actually makes it happen *later* in the cycle, not earlier. The earlier the spark happens, the more *advanced* the spark is.

Just didn't want anyone to go down the wrong path based on this...



Of course you are right! Oops.. You guys don't let a thing slip (which is good!)Didn't catch that one - fingers faster than Brain... again!

But, the DME does retard the Spark, that is, produces it Later in the Engine Cycle. It does this so some Fuel remains unburned and consequently, the Pressures and Temperature in the Combustion Chamber are lowered, raising the Knock Threshold.

Happy Motoring!... Jim'99
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