Heads don't lift.
Head gaskets will blow out under certain conditions, too much boost for the octane available, too lean a mixture, etc.
But heads don't lift. Been hearing that term a lot lately on this board and can't for the life of me understand how or why is started lately.
Heads don't lift.
Head gaskets will blow out under certain conditions, too much boost for the octane available, too lean a mixture, etc.
But heads don't lift. Been hearing that term a lot lately on this board and can't for the life of me understand how or why is started lately.
Sorry Dave but I strongly disagree!! Heads do lift!! If the head bolt/studs in use are not of sufficent material and torqued to an adequate stretch value to withstand the cylinder pressure put against them they will stretch enough (lifting the head) that the gasket will leak and or move because of the lack of clamping force on the gasket. To the point I put 1/2" studs in my motor over the winter and have been over 60# of boost with no issues so far as far as head gasket seal. Last year with the 7/16 studs I couldnt make over 3-5 passes without torching a gasket.
So that raises the question , what kind of head bolts/studs are you using??
Mike
Ok Im sorry for using mine as any kind of example in this situation. I was just pointing out that given a certain set of conditions that may provide suspect cylinder pressures this is a possibility. My question about what head bolts was directed at fast4ward. I will step off now!!! Mike
This is incorrect
Mark
And you know this how???
Heads can lift without detonation. I have data logs that indicate zero knock and head gaskets are in pieces. My knock sensor works just fine. Boost average was 29lbs. 10.7 on the WB.
And you know this how???
Heads don't lift.
Head gaskets will blow out under certain conditions, too much boost for the octane available, too lean a mixture, etc.
But heads don't lift. Been hearing that term a lot lately on this board and can't for the life of me understand how or why is started lately.
The fire ring is still intact but the tell tell signs of grooves in the graphite (detonation) behind the fire ring is present. How is the fire getting past the fire ring? Youv'e got the head pulled flat against the fire ring with 75-80 ft. lbs. or torque. I've seen more than one that way. Gasket is not blown but the graphite is being blown away --How?
wondering if say 10-15 lbs of boost would lift the head with zero knock. thnx.
Since you first posted stating that cyl heads do not lift , I will let you explain YOUR conclusions