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Better Mileage
Posted by Brooks G (more from Brooks G) on Mon, 2 May 2005 17:34:39
In Reply to: Prem recommended.., Mike Lynch [Profile/Gallery]
, Mon, 2 May 2005 16:04:50
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Mike,
Your comments about chemically impossible would be correct if this was a static situation, but it isn't, the piston is moving. What happens is that with lower octane, the spark is retarded, i.e. the fire is lit off later, so the piston is further down on its power stroke before maximum pressure is generated in the cylinder and the pressure on the cylinder is lower through most if not all of the power stroke than it would be if the fire could have been lit off a bit earlier. So some of the energy that could have been pushing on the piston is wasted. This is the same reason you can get more power out of an engine on higher octane fuel.
Now us Californians are in trouble in any case considering 91 octane is the best we can get.
Brooks,
posted by 67.49.47...
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