Shoerfast; I am just quibbling here; I dont feel there should be higher cylinder pressures in the saw with the longer bar if the operator is doing his job!. If he lays on the saw, sure the longer chain will drag the saw down more. That is lugging it down and it will run hotter and have higher cylinder temps and pressures because of a lower piston speed in relation to expansion rate of the burning charge. No disagreement there. I just dont think a good operator should let the bar length dictate the operating rpm of the saw. That is his job. Adjusting depth guides accordingly for differnt chain lengths or engine size does make that easier.
That is why I dont think different bar length requires a different mixture. The proper mixture will give a different no load wide open throttle tach reading though, but as Lakeside mentions that is a crude way of arriving at approximately something.
