Plasmech
Addicted to ArboristSite
What is usually the compression ratio of a modern chainsaw? If we need specifics, Stihls. I know less about 2-cycle than 4-cycle for sure. So 2-cycles usually have a (relatively) very short stroke?
What is usually the compression ratio of a modern chainsaw? If we need specifics, Stihls. I know less about 2-cycle than 4-cycle for sure. So 2-cycles usually have a (relatively) very short stroke?
didn't mean to hi-jack your thread plastech
I would assume he means pre ignition. Pre ignition is detonation.What is pre det?
The simplest answer is to take compression reading in psi and divide by 14.7.
ie. 150 psi = ~ 10 to 1 compression ratio.
The simplest answer is to take compression reading in psi and divide by 14.7.
ie. 150 psi = ~ 10 to 1 compression ratio.
The simplest answer is to take compression reading in psi and divide by 14.7.
ie. 150 psi = ~ 10 to 1 compression ratio.
Your right. Adding the 14.7 to the gauge pressure is just to get absolute pressure. You have to add the 14.7 to the gauge reading before you divide by 14.7There looks to be an order of ops problem with the formula?
CR = (compression gauge reading +14.7/14.7)^.71 does not work if you substitute 160 psi in for the gauge reeding the answer comes out to 33 and change?
Maybe, but I'm not sure what the 14.7 are intended to represent, I assume one is your see level pressure the other would be actual?
CR = ((compression gauge reading +14.7)/14.7)^.71 this returns 5.8 which would be more plausable. Though still its just a guesstimate as there is no acounting for ring sealing, thermal dynamics, pumping efficiency, charge density...
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