Quote:
Originally Posted by kendunn
So if its 8:1 and atmospheric pressure is 14 psi, how do you get 185 psi? I am not saying you don't, just wonder how. Like I said, my gauge may be off, but I am getting 125 in both my bikes and 90 in my boat (which is what the shop had marked on the heads also). I know in multi cylinder motors they say if the pressures are all close you should be OK
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Using certain brands of Schrader valves in your compression gauges will affect the reading. I have a Snap-On set that requires a special low tension Schrader valve. If I use a stiffer sprung valve the reading will be off about the same as you describe. I'm not sure that is your issue but it's worth checking out.