Blow by Gauge 40375
B&B’s Blow-By Gauge is the only effective way to measure piston ring sealing with the engine running. Blow-by is the pressure that builds up in the engines crankcase and escapes through the breather in the valve cover. That pressure is actually combustion gases that get down the cylinder walls past the rings. The more the blow-by, the more problems exist in the engine.
This meter can be hand held to check on an engine in the car/boat or mounted in a dyno test facility.
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