Air box drains - Page 2
 

Air box drains

Started by brando4905, March 27, 2010, 06:42:38 AM

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bryanhes

Ok, anyone have a DD part #

Bryan

Just Dallas

I'm just an old chunk of coal... but I'm gonna be a diamond someday.

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
JC
Blackie AB
1977 MC5C, 6V92/HT740 (sold)
2007 Country Coach Magna, Cummins ISX (sold)

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
Bob@Judy  98 XLE prevost with 3 slides --Home done---last one! SW INdiana

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
Life is short drink the good wine first

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

I'm just an old chunk of coal... but I'm gonna be a diamond someday.

bryanhes


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
1990 Crown 2R-40N-552 (the Super II):  6V92TAC / DDEC II / Jake,  HT740.     Hecho en Chino.
2kW of tiltable solar.
Behind the Orange Curtain, SoCal.

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?
1941 and 1945 Flxible - South Lyon, Michigan