Blow By Meter?

[flattom]

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.

 

[21121956]

Hello everybody:

flattom, just like a beginning in your task, search in the thread71-150178.

Good luck !

 

[catserveng]

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.

 

[flattom]

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?

 

[Lou Scannon]

add a plenum in series before the meter

 

[flattom]

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.

 

[Lou Scannon]

also known as a surge tank.

 

[WALTERZIP]

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/

 

[Fabrico]

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

 

[SMOKEY44211]

J-TEC

http://www.j-tecassociates.com

----Phil