Reply To: compression loss due to hose on gauge

[modhydro]

Even with the hose discrepancy, a multi cylinder engine can still be diagnosed with it being a comparitor and not absolute measurement. So long as all cylinders measure roughly the same, you can be confident in the condition. You will have to have a basic understanding of the ballpark that engine should pull though. Is it a 140psi engine or 80? If you know a rough target for a single cylinder, the same thing holds true.

With the testers with the check valve at the cylinder, how accurate is the gauge itself? Lots of variables and things that could easily get a guy sidetracked for sure.