Oil crankcase Mist

[Prospeeder]

ok, Jeff M told me somthing about oil in ur tb building up from Oil fromt he crank case mist, i have it, but its only in the TB, and is leaking its way out where the IC pipe and TB connect, and its really annoying, but the turbo, IC, and air box are all oil free, could some1 please explain how this works, what causes it, and is it preventable?

[DaveFromColorado]

a lot of times what happenes is when you go into boost, your PCV valve can't handle the pressure to some of it gets by and into the crankcase and blows the oil mist from the spinning crankshaft back up through the breathers and into the IC pipes and TB and such...

 

one of the mods that almost all the turboford guys do is to put a metal check valve (usually from the air pump system of an aerostar) in line with the PCV valve and this will almost always cure this problem.

 

not sure if that will work with a turbo 3.1 but I always put a check valve in line with the PCV valves when working on turbo kits for the little import engines.

 

Just a thought, hope it helps some...

 

--Dave.

[Prospeeder]

wow, thats exactly what i wanted to know! thanks.So a metal check valve, will any work, or just find one from an areostar, and how would u put them in, just stick them right after the PCV valve or what?

[DaveFromColorado]

usually they stick the metal check valve between the PCV valve and the vacuum source.

 

any should work, they use the one from the Aerostar because well, they're ford guys - but you'll want to get a good heavy duty check valve - make sure that you'll get you have the flow properly set so it's pulling air from the crankcase into the intake, if it's backwards you'll find that you'll have a bigger mess to clean up.

 

--Dave.

[pitzel]

Running an oil that leaves few deposits, ie: Mobil-1 or the other synthetic products, should reduce the incidence of gummy build-up on intake components.

 

Since you're running a turbo...you ought to be running synthetic anyways.. Just for the heat soak capability. Save those turbo bearings, eh?

[DaveFromColorado]

it's not really the deposits that's gettin' into the intake, it's more of blowby past the PCV valve (or rings/pistons if it's a really* tired engine) because of the turbocharger - if you're seeing this on an N/A car, you should clean out your engine with a kerosene flush, and then run a synthetic oil, but in this case, I'd recomend the check valve.

 

--Dave.

[Prospeeder]

oh ok, ill do that, any one else done this? like have a pic? ill try and see what i can do about that, the PCV prolly needs changed, ill put it on when i do a tune up

[stockgp]

kind of off topic, but does anyone remember some invention to put on your crank to cut down crankcase mist? not only that, but it's supposed to make the crank travel through the oil more easily freeing up some power.

[DaveFromColorado]

well, there's knife edging the crank, so it can cut through the oil, and then there's a windage tray to help reduce the oil splatter from the spinning crank (or windage) or if you really wanna go all out, you can get a vacuum pump and use that on the engine to keep the crank in vacuum all the time -

 

I'll see if I can dig up a pic of a check valve in line with the PCV valve - I don't need to run one on my car as all my vacuum devices are between the carb. and the turbocharger.

 

--Dave.