Author Topic: Port timing.  (Read 5985 times)

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Offline Al Smith

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Re: Port timing.
« Reply #90 on: February 24, 2013, 06:38:27 am »
Well that 130 PSI static isn't helping things for sure .99 opening from 101-102 probabley has little if any effect .

In my way of thinking raising the upper transfers would not be benenficial because of two reasons ,First it would start the transfer at lower crankcase pressure and it conjuction with the exhaust opening there would not be the differentials of pressure existing between them.The transfer pressure phsically at the time of transfer has to be higher than the exiting exhaust pressure or else it just will not happen until it is so .

I wouldn't fiddle with it any more until you figure out why the static pressure is so low .Oh I suppose the intake side of the piston skirt could leak some crankcase pressure but it would really have to be concentric to do that .I mean out of round like a football .I've seen some really  funky pistons do a pretty good job

That flap wheel hone job probabley didn't help things but given enough run time the rings should wear in .Might take a while though .

Don't give up the ship just yet .FWIW the 038 Mag which a lot of folks on this forum have seen in action had a funky intake side from a torn boot .It took me nearly all summer cutting down from a 10 cord pile of oak to seat those rings with 5-10-15 minute run times .When those rings finally decided to straighten up and fly right it was like a jet with an after burner .

New rings on an old cylinder are  not the same thing as a complete new top end .It usually revives them but sometime it just takes longer .

 

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