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CDR What do you think?

Are we forgetting that a crannkcase vented to atmosphere is pushing against 15 psi average pressure?
I tried the old "road tube" on the 6.5, and I discovered leaks. Never leaked oil before. I went back to the tuna can, but with a longer vent hose curling around the intake, on a slight down slope from the custom (larger I>D>) hookup to the turbo intake elbow. The oil tends to coalesce and return to the can. Best of all, no more leaks.
Kenny, smart guy like you should have no trouble rigging a vent system. for pressure control, would 2 CDRs in parralel flow too much?

I'm still trying to reinvent the provent for less $$. So far, the longer vent tube helps return some oil to the can.
 
dangerousdave said:
Are we forgetting that a crannkcase vented to atmosphere is pushing against 15 psi average pressure?I tried the old "road tube" on the 6.5, and I discovered leaks. Never leaked oil before. I went back to the tuna can, but with a longer vent hose curling around the intake, on a slight down slope from the custom (larger I>D>) hookup to the turbo intake elbow. The oil tends to coalesce and return to the can. Best of all, no more leaks.
Kenny, smart guy like you should have no trouble rigging a vent system. for pressure control, would 2 CDRs in parralel flow too much?

I'm still trying to reinvent the provent for less $$. So far, the longer vent tube helps return some oil to the can.
Click to expand...
Sorry Dave,i cant agree with that.We have no air compressor here,besides that you can only measure crank case pressure by deadheading,in wich case the pressure keeps building till something blows out.Venting to the road wont build case pressure,unless the vent is plugged

If you got that much case press you could prob run a jack hammer on it or use a impact wrench when you get a flat on the road:D
 
However is you say you have 1 psi vacuum thats only 14psi vs the 15psi atmospheric. Its all relative. If the crankcase was at atmospheric you would just see it as 0 pressure inside it, because it would be equal to whats outside. So it doesnt matter that there is atmospheric pressure. I can agree though that if you have some bad seals it will help stop leaks by having the vacuum.
 
Slight vacuum in crankcase means air will move into the crankcase - through seals etc. With just a road tube the pulses from piston movement will push/allow the oil out of marginal/bad seals.

There is a benefit from the CDR setup. That is until the blowby is so bad that the CDR can not keep up.
 
dangerousdave said:
I'm talking about the 15 psi normal atmospheric pressure in at sea level, has nothing to do with engines.
Click to expand...
I did.nt read your statement right,in any case atm pressure should be in the engine as well so that equels it out.

Positive or negative case pressures are a double edged sword.
positive press can pass oil out.
neg press can pass dirt in.

I rather have neither, but thats my opinion

PS,i thought i was never going in that CDR bullshit again,Now i see i'm doing it again:mad2: :smile5:
 
TD checked mine today and it seems to have mopre than MAtts but same as his. My two 6.2s are about the same. If you disconnect the CDR hose at the turbo elbow and as Bison said(I like the term BTW) deadhead it with my thumb pressue builds to the point where after 30 seconds or so when you let go it rushes out in sort of a whistle but when the CDR is hooked up and pull the Oil cap, no blowby at all. Is this normal ?
 
Acesneights1 said:
TD checked mine today and it seems to have mopre than MAtts but same as his. My two 6.2s are about the same. If you disconnect the CDR hose at the turbo elbow and as Bison said(I like the term BTW) deadhead it with my thumb pressue builds to the point where after 30 seconds or so when you let go it rushes out in sort of a whistle but when the CDR is hooked up and pull the Oil cap, no blowby at all. Is this normal ?
Click to expand...
thats the way it works Ace,its continues blowby that causes the press to build,you stick your finger in the hole in the dyke and its got no where to go.If you would'nt blow a seal or gasket in the end,you could let it build almost to compression pressure

On a good engine yes
 
So explain to me why the cummins 12v has it vented and no problems till the line is clogged. I have normal leaks that I fixed and all is good. The 12v should be the same as the 6.5 so why the big deal with venting it to the ground.
 
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