Originally Posted by
SrTelemaster150
y
Sitting here mulling over the variance from #2 & #3 cylinder timing has me wondering of a leading and trailing geometric effect of the linked rods compared to the master rod is a factor here.
BTW; I checked my FA-450R3 master rod and as close as I can tell, the link pin bores are at 120* spacing relative to the master rod bores.
OK, there is a leading and trailing rod angle geometric factor in play and it is about 7* respectively between the linked & master rod C/Ls. A total of 15* variance between #2 & #3 rod angle.
This will affect cylinder pressure @ 30 crankshaft * BTDC hence differing optimal ignition timing values for each cylinder to prevent detonation..
I did a crude drawing to wrap my head around it. I will do a better drawing to illustrate the difference.