How much would I have to mill from my head to correct combustion pressures back to sea level?
--------------------------------------------------------------------------------
Guys, I just bought a compression tester today. I just wanted one. Eric's book says a properly running 250, at sea level, will produce between 170-230 psi. I am at 4500 feet of elevation.
My maximum cylinder pressure is 160 lbs. It will hold this pressure for hours.
My bike is running perfectly. New cylinder, new piston, and new rings. Broken in for 5 hours.
My question is this. How high can I raise this pressure, by head milling, before I get into trouble?
On a 68 mm bore, how much should the head be milled to raise the pressure to 185 or so?
Is there a better way to figure this?
Should I just say screw it and mill .5 mm from the head????
I would love to hear any opinion on this. All opinions. New folks, dont be afraid. I am trying to make a decision on all of this. Cost is nop issue. I also have two heads. Even if one is ruined, no big deal.
My altitude is 4600ft. I understand the pressures are lower here due to high altitude. How much can I mill to bring me back to seal level values?
--------------------------------------------------------------------------------
Guys, I just bought a compression tester today. I just wanted one. Eric's book says a properly running 250, at sea level, will produce between 170-230 psi. I am at 4500 feet of elevation.
My maximum cylinder pressure is 160 lbs. It will hold this pressure for hours.
My bike is running perfectly. New cylinder, new piston, and new rings. Broken in for 5 hours.
My question is this. How high can I raise this pressure, by head milling, before I get into trouble?
On a 68 mm bore, how much should the head be milled to raise the pressure to 185 or so?
Is there a better way to figure this?
Should I just say screw it and mill .5 mm from the head????
I would love to hear any opinion on this. All opinions. New folks, dont be afraid. I am trying to make a decision on all of this. Cost is nop issue. I also have two heads. Even if one is ruined, no big deal.
My altitude is 4600ft. I understand the pressures are lower here due to high altitude. How much can I mill to bring me back to seal level values?
