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Cylinder leak down testing

  • Thread starter Thread starter Guest
  • Start date Start date
crapwacker said:
Well at any rate, I did score 850 jugs and pistons for a swap that will be a winter project. I suspect an exhaust leak in #3, as sync readings there where low, and that is the 95psi cylinder. I'll find out this winter
Click to expand...
Sync readings were low??? Exhaust valve leak??? Lemme ask you this... when you synced the carbs, did you plug the vaccum feed line for the petcock on carb number 3?? If you didnt, its gonna suck air thru that line, hence your low reading.
 
TheCafeKid said:
Sync readings were low??? Exhaust valve leak??? Lemme ask you this... when you synced the carbs, did you plug the vaccum feed line for the petcock on carb number 3?? If you didnt, its gonna suck air thru that line, hence your low reading.
Click to expand...
Good point. Is that vac point drawl the same as the vent hoses? As I don't have a vac petcock, all three are vented. I was thinking OEM configuration was for the left-hand most vac line went to the petcock, and the two on the right vented over the back of the airbox. I was also thinking carbs are referred to as 1 2 3 4, from left to right. If not, then I'm bass-ackwarded. At any rate, if the petcock port is using a different circuit in the carb, then it should remain pluged if using other than a vac petcock, correct? Also, low (95psi) in #3, so it could be either valve might have a leak,right? I don't know, that's why I ask. I will be doing a leak-down this week for more info. At least it runs well.
 
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