Air box drains

[bryanhes]

Ok, anyone have a DD part #

Bryan

[Just Dallas]

Removed

[lostagain]

From my own experience, and talking with old knowledgeable DD mechanics, open air box drain holes don't make any measurable or appreciable difference. Mine, and many 2 stroke DDs run just fine without the check valves.

JC

[robertglines1]

Bryan if they are free try it and find out for yourself...I see you built a catch can so must have had a reason....mine were only dirty and left spots on car...cleaned and curred problem...happy bussing

[bryanhes]

Dallas,

Are there only two? I would think there would be four (two for each side of the block). But I don't see any puke tubes for the right side of the engine. If there are two on each side the right side must be a bear to get to on my 4905.

Bryan

[luvrbus]

Bryan, incline engines drain to the low side of the block one on the high side would do no good DD has a kit for incline engines


good luck

[bryanhes]

So then I only need two then. I only built the catch can because of what dripped in the drive and hoped to cut down on the oil spots on the rear. My Tuarus fan seal is leaking so I stil get spots 

Dallas,
Are the ones you have the right ones?

Bryan

[Just Dallas]

Removed

[bryanhes]

Thanks Dallas

[Iceni John]

How often should one clean out or do PM on these drain valves?   I've heard horror stories if they don't work, causing oil to accumulate in the airboxes and possibly causing runaways.   I think my engine doesn't have an emergency air shut-off flapper, so I can't risk anything that could increase the chance of a runaway.   I think my valves work OK, because I can't feel any air coming out of the snot tubes when the engine is over 1000 RPM or so;  they definitely drip an occasional drop at low idle!

Why are there different versions of these valves  -  one for 900 RPM and another for 1400 RPM?   Is the difference the pressure they close at?   Why would one want some intake air bleeding off at any RPM higher than fast idle?

Sorry for all these questions  -  my Detroit info doesn't talk about this.
Many thanks, John

[Kenny]

Speaking of catch cans, has anyone ever added some type of catch can to the crankcase breathers?  Or maybe redirected the breathers to the air intake between the air cleaner and the turbo?