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Somender,

     To let you know - John John (JJ) took Western Canadian Championship on 85 Yamaha with Somender's 5 groove set-up.  Shaving head 10 thou out-performed 3 groove.  Jet sizing way down - performance way up.  4 stroke Honda was hole shotting 90% of every race.    Thank you very much for helping us out.  Happy New Year & best wishes to you and yours.  kp / whitecourt
Will the Groove help a Propane Engine? PDF Print E-mail

Theoretically Yes.
Propane is a very slow burning fuel. Converted engines benefit from advancing the timing over gasoline settings because it takes so long for the chemical energy in the propane to convert into thermal energy durring combustion. The grooves promote a "gust of wind" on the compression stroke that would help to better homogenize the propane with the air, then the warm jet stream on the power stroke would carry the flame front around the cylinder to "take the fire to the fuel" quicker. By helping the propane to combust quicker, more energy would be released earlier in the power stroke. This would convert more of the heat energy in the fuel into crankshaft power (Brake Specific Fuel Consumption, or BSFC for short).

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