crankcase vent into exhaust

[littleredstroker]

love the drawing....

 

[Justin@DP-Tuner]

love the drawing....

Thanks lol

 

[SoCalPSD]

Moroso Crankcase Evacuation System


http://www.jegs.com/p/Moroso/Moroso-Crankcase-Evacuation-System/751825/10002/-1


Reduces crankcase pressure throughout entire rpm range for increased piston ring seal, reduced intake charge contamination, and fewer oil leaks
Track and dyno tests prove significant increases in engine performance
Includes 2 each: Oil Separators/Breathers, Breather/Filler Cap Grommets, One-Way Check Valve and Weld-In Nipple for header collector



710-25900
Crankcase Ventilation System
More info on Moroso 25900

$59.99

 

[SoCalPSD]

I run this on my chevelle. Works great.

 

[Vizsla]

It just won't work on the modern diesels, especially modded ones. You are borderline doing it on a mild 7.3, but no bueno on a 6.4, too much pressure to allow the required vaccum to exist at the most crucial times for ccv performance. It would be nice, but a loop with a proper catch can is the ticket.

 

[Justin@DP-Tuner]

It just won't work on the modern diesels, especially modded ones. You are borderline doing it on a mild 7.3, but no bueno on a 6.4, too much pressure to allow the required vaccum to exist at the most crucial times for ccv performance. It would be nice, but a loop with a proper catch can is the ticket.

Wouldn't having a 90* fitting in the exhaust pointing towards the end(see awesome picture a few replies above) create vacuum?

 

[G Racing]

It just won't work on the modern diesels, especially modded ones. You are borderline doing it on a mild 7.3, but no bueno on a 6.4, too much pressure to allow the required vaccum to exist at the most crucial times for ccv performance. It would be nice, but a loop with a proper catch can is the ticket.

So what you are saying is that a 468 CBB with a 871 won't produce as much exhaust pressure as a powerstroke??

 

[oneofakindSD]

i need to try this setup for myself ,if you have straight pipe you should have plenty of vacuum to pull crankcase pressure.

 

[lowbedriver]

I've done this and it WORKS!.Long thread about this in the 7.3 aftermarket section basically the exhaust flow creates a vacuum in the bung thats welded at a 45degree angle into the downpipe.same effect as drawing fuel thru a carb venturi

 

[lowbedriver]

BTW Gracing these seats make a nice sitting area in my living room! imp:

 

[G Racing]

BTW Gracing these seats make a nice sitting area in my living room! imp:

:biggun:
:doh:

 

[Dzchey21]

I get what you guys are saying about back.pressure. but how much back pressure actually exists in the exhaust system? I seriously doubt that the pressure in the exhaust I higher than the crankcase pressure under boost.

I do see that the moroso set up comes with check valves but I'm guessing that's because crank pressure isn't that high on naturally asperated gas engine

Maybe ill wire my external map sensor to read crank pressure and maybe add an additional ebp sensor in the down pipe

 

[Powerstroked162]

I get what you guys are saying about back.pressure. but how much back pressure actually exists in the exhaust system? I seriously doubt that the pressure in the exhaust I higher than the crankcase pressure under boost.

I do see that the moroso set up comes with check valves but I'm guessing that's because crank pressure isn't that high on naturally asperated gas engine

Maybe ill wire my external map sensor to read crank pressure and maybe add an additional ebp sensor in the down pipe

Unless you have a chitty set of piston rings, exhaust pressure is going to be higher then crankcase pressure....

Catch can or to atmosphere my friend

 

[Dzchey21]

That doesn't really answer my question. I want to know what crankcase pressure is vs exhaust back pressure post Turbo... might have to do the research myself

 

[bigrpowr]

Unless you have a chitty set of piston rings, exhaust pressure is going to be higher then crankcase pressure....

Catch can or to atmosphere my friend

Not really the case steve. If you understand the dynamics of vacuum this case should be a slam dunk unless diesel exhaust creates bp? Does it or should you consult your mentor some more? LOL

 

[Dzchey21]

Not really the case steve. If you understand the dynamics of vacuum this case should be a slam dunk unless diesel exhaust creates bp? Does it or should you consult your mentor some more? LOL

That's what I'm getting at. The exhaust flowing thru the exhaust creates the vacuum and by welding a bung in the ehxuast you haven't created a new path for the exhuast to flow. The exhaust still flows from down pipe to tail pipe at a pretty rapid pace so I would think it should work fine but like I said I'm gunna research some things before I say yes or no

 

[Powerstroked162]

Not really the case steve. If you understand the dynamics of vacuum this case should be a slam dunk unless diesel exhaust creates bp? Does it or should you consult your mentor some more? LOL

Damn, nice line, guess your out of the loop though.

6.4 book says cranckcase pressure with no load, measured using a crankcase tool from ford, should read 10 inches of water... And if my calculations are correct equates out to about .36psi.

Gonna have to go with the gut and say exhaust pressure post turbo is gonna be just a Tadd more....

 

[Dzchey21]

Let me throw this out there.

I have a defuser at work used to pull a vacuum on hyd tanks fuel tanks and even a/c systems. It uses regulated air pressure to.create the vacuum. When you put more pressure to the defuser the amount of vacuum drawn also goes up because the flow is also increased I don't see why this wouldn't be any different...


Also I noticed on a machine the other day that had a dust ejector on it that there is a pipe welded in the exhaust at a 45 that hooks to the precleaner on a machine to suck the dirt out of the precleaner into the stack and then out of the stack. I put my hand over the pipe with the engine at an idle and surprisingly it pulled a decent vacuum. Maybe ill dissect a muffler and see how its set up

 

[Heavyhaul]

I think just after the last bend in the down pipe where the factory downpipe joint would be at the 45 degee angle would work. Turbulence wouldnt matter at that point. Not to far away and plenty of burn off time. The trick is going to be how far the 45 degree pipe would need to sick in the create the vacuum vs flow past the pipe. If im thinking right the more flow past the joint the bigger the low pressure is going to be on the back side of the pipe.

I also think the size of pipe you use vs exh diameter may also be a factor.

 

[lowbedriver]

Guys,its the exhaust flow past the orifice that creates the vacuum in the ccv line to pull the check valve open plus the slight pressure from the crankcase.The bung needs to be in the highest velocity part of the pipe.I put mine halfway between bends in the downpipe