muffler/crankcase pressure?

Have any of you hooked up a manometer to the muffler pressure or crankcase pressure? Just how much pressure are we talking about?

>Have any of you hooked up a manometer to the muffler
>pressure or crankcase pressure? Just how much pressure are
>we talking about?

I didn't do anything fancy. I just stuck the end of the tube hooked to the pressure tap on a muffler on the engine on my test stand and stuck it into some water. The bubbles stopped at about three to four inches in depth. I guess that would translate into about two to three ounces of of additional pressure. Not a lot, but still makes a significant difference in the setting of the needle.

>>Have any of you hooked up a manometer to the muffler
>>pressure or crankcase pressure? Just how much pressure are
>>we talking about?
>
>I didn't do anything fancy. I just stuck the end of the
>tube hooked to the pressure tap on a muffler on the engine
>on my test stand and stuck it into some water. The bubbles
>stopped at about three to four inches in depth. I guess
>that would translate into about two to three ounces of of
>additional pressure. Not a lot, but still makes a
>significant difference in the setting of the needle.

Ron B.
F4Fguy

That's about what I got on muffler pressure.It varies a little of course,depending on muffler type,tap location and back pressure.But not enough to make me put the tap anywhere other than the most convenient place.

The one time I measured CC pressure was years ago,on a Tigre .60.It varied significantly with speed and ,as expected,peaked at roughly the torque peak and at about 6psi.Please don't hold me to those numbers as they're from memory,but I do recall that the reason I didn't use CC pressure was because of the variation and the overall pressure level.I tried a Jim Walker pressure regulator,which was all that was available at the time,but it couldn't handle the range of pressures.Nowadays,of course,it's a different ball game,with pumps and regulators commonly available.