Mastermind
Work Saw Specialist
Ok, lets get this train back on track...been a good thread so far. Just reread the OP's question.... which was ...how do you decide on timing numbers? Yes, I have a degree wheel, but that don't mean squat without know what timing to set the exhaust to....
I understand that this has been sorta answered...ie... the black majic comment, but its still frustrating. Are there any tables ...or a reference for particular saws? ie, the 346xp, at this point, I would have to assume that between all the builders, DD, MM, Brad, tlandrum, treemonkey etc, that someone would start honing in on some general numbers that work for that saw.... or at least that particular cylinder. and why aren't they posted in a wiki somewhere? did I miss something? the OP hasn't posted in a while....is this getting the train back on track?
I use a displacement to exhaust height rule......
I have notes on every model I've done......and am happy to share them.
346XP NE
Stock:
Ex: 107°
Tr: 123°
In: 74°
Compression: 145psi
Squish: .038
Ported:
Ex: 105°
Tr: 120°
In: 78°
Compression: 210psi
Squish: .020
Notes:
Cut .050” from squish band.....compression ends at 210