Dwyer gauge

[V M Kauffman]

Originally Posted by Alan Roehrich

That isn't really practical, if it is even possible. It has to be mounted perfectly vertical, and it uses a steel ball to measure flow, so you'd have various G forces acting on it, preventing it from working correctly. Its pretty much a dyno only device. There are some "blow by" or "crankcase pressure" sensors on the market, but they're not cheap.

The one I used was a Fisher-Porter same one Chryser Race Group used was about $300.00 30 years ago. I could hook it up as Alan described and if it was bad enough the weight in tube would bounce just spinning on starter. We would check engine every time we loaded car to come home by hooking up meter and just free rev engine to 6500 rpm if Blowby was over 2 cfm engine would come apart we we got home. Difference on a 740 hp engine on dyno at 6 cfm down was down 60 hp to 1 1/2 cfm. Ted Flack showed us how to use it. When Chrysler tested at the race track they used the meter on all wet sump vehicles. Sometimes it was actually mounted in the Vehicle.

[Dave Gantz]

Is a Dwyer gauge the same as a manometer? I made one years ago for use in testing outdoor power equipment engines.
Maybe it's not precise enough in this case, but here's one similar to the one I made:

http://www.obairlann.net/reaper/moto...manometer.html

[GTOMayhem]

I have several questions, I apologize if they seem basic, as I am just trying to learn as much as possible.
In the other thread, 2 cfm blow by on a race motor is mentioned as the point to be concerned. What would a typical high performance street motor be expected to measure on blow by? What effect would a power adder, such as a supercharger or turbo, have on this measurement?

Thanks in advance
Rick Thomason
GTOMayhem