Still sober & spark plug location question

[Craig CT]

Originally Posted by Ol' Ron

Me too, 28 years now. Had allot of help. This is a topic that can lead to allot of speculation. I moved the plug into the transfer area to reduce the flame front. This works with a tight combustion chamber (.045-.050" piston to head clearance), JWL did this in his book "Flathead facts". My plan was to run a test of a stock head against the modified head with the same CR. The Edmonds head has the blug in the center of the chamber between the two valves, allowing the use of a power tim plug and this had shown improvement in economy. However with all this said, someone would have to make an effort to "TUNE" these comparisons for accurate results. That takes time and money. Not many of us left that want to do this.

Hi Ron; I knew you had a lot of years, thanks for posting it. Also thanks for mentioning JWL's book, beginning on page 59 he relocates a plug. I hope he writes another one soon. As for the Edmonds heads isn't improvement in economy improvement in efficiency? Thanks again, Craig.