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Blow By Meter?

Blow By Meter?

Blow By Meter?

(OP)
I've been tasked to develop a blow-by meter for a single cylinder test engine.

I'm a little stuck and not too sure on my direction to go in.

I understand what blow by is, but a little unsure how to measure it. I was looking at gas meters and wondered if i condense the flow in a pipe and placed a venturi meter on this flow if i can back calculate the flow?

Any suggestion or and hint / direction would be much appreciated.

RE: Blow By Meter?

Caterpillar has a service tool with two attachements, one for "large" engines and one for 'small" engines.

We use 1 CFH/hp as a typical blowby rate from our engines.

The tool group is a small flow meter with a straightening tube that hooks up to the crankcase breather during test.

Hope that helps.

RE: Blow By Meter?

(OP)
my main issue i have now is how to control the pulsating gases. I know how i can filter the oil mist out, but not too sure how to "normalize" (if thats the correct word) the gas flow. Any help?

RE: Blow By Meter?

add a plenum in series before the meter

RE: Blow By Meter?

(OP)
i don't want to sound too stupid or ignorant, what is one? just googled the word and got a load of results about plenum cables between cavities, and reminded me of my time as a cat5e engineer installer.

RE: Blow By Meter?

also known as a surge tank.  

RE: Blow By Meter?

Our dyno facility has used J-tec flowmeters for many years.  

Also, a surge tank is just a big empty volume that diminishes pulsation.

http://www.j-tecassociates.com/

RE: Blow By Meter?


On the Cat 3208 you can measure blow-by with an opacimeter meant for exhaust. smile

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