Just to get opinions on reducing engine blow-by on the turbo tC's...I just noticed not many people are dealing with this and I'm interested in the best option for our tC's.

 

I searched this out from seen4ever....

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the PCV system is a tricky beast. Yes, dumping to atmosphere is a good option, but how are you going to get the gases to go into the catch can at all times. I'll point you to a link on honda-tech, which goes into a huge amt of details.

http://www.honda-tech.com/zerothread?id=1199935

for my setup on my honda, I'm lucky, as my block has two large ports that can be opened and used for crankcase ventiliation. the two ports are feed into my catchcan which has a filter on top (Moroso catchcan, its baffled, one of the few that are, you want it baffled). By having the duel ports, the pressure is releaved and is able to flow from one port to the other.

What i see most people do is run a hose from ther PCV valve to a catchcan, then that's it. well the PCV is a checkvalve. if boost is pressing on it, it wont open. So this is great for NA cars, as in stock form its PCV to intake manifold, always vacuum source. if you did this with boost, then any time in boost, PCV isn't being vented and your rings are getting more pressure built up under them rather than where it shoudl be on top of them.

this is why the dual port setup before a PCV setup works on hondas. What i now recommend people to do, is run the old school slash cut ventilation. PCV valve to hose to a slash pipe in the exhaust. The slash pipe is a metal small pipe that is welded into the exhaust at an angle with the outlet pointing towards the flow of the exhaust. Therefore the exhaust of the car causes a vacuum to pull out the crankcase gases.

the crankcase gases are basicly oil vapor, as when the rods are moving fast on teh crank, oil is slug off them creating a vapor in the air beneath the piston. this vapor causes pressure under the piston, basicly imagine pressing down on a balloon. if the balloon's gases are vented its harder to press down on a fully inflated balloon rather than a deflated one. the gases can build up and put strains on the pistons, the rings are what break due to thsi pressure from crankcase gases under them and from the combusion process above them. So that is why the PCV system is there, to releave that pressure. If you are boosted, it needs to be addressed or problems can happen.

On stock boosted cars, this is why you may see the PCV running to the intake before the turbo, as that always has vacuum, but if its pre-MAF, you can get oil on your MAF which will screw it up and you are still putting oil vapors in your intake air. Oil decreases the octane rating of your gas, thereby causing detonation.

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WHAT ABOUT THE TURBONETICS KIT IS THAT KIT SAFE?

 

Not sure what you mean. All turbo kits produce pressure and that pressure creates a problem since the PCV valve will be pushed shut since there is no vacuum being pulled from the intake manifold while it is under boosted pressure.

I understand one fix is to remove the line from the PCV valve going to the intake (left rear of valve cover) and route this to the exhaust line using a scavenger kit in the exhaust pipe. I would presume you would then close off the intake part of the line so as to not have an open hole on the intake manifold.

They make an old school kit that has a check valve (so exhaust can't get pushed back into the crank case) and the 45 degree cut. Check out this link.

http://www.teglerizer.com/triumphstu...scavenging.htm

 

hmmm... interesting

 

MAN THATS PRETTY DEEP; i DONT KNOW MUCH OF WHATS SAFE OR NOT A TURBO CAR. SO YOURE SAYING IF THIS ROUTING ISNT DONE YOU CAN CAUSE DETONATION.

 

Well, in theory, the oil from the PCV that gets dumped into the manifold does lower the octane of the gas....but the biggest issue is the pressure built up.....where does it go.

 

so can someone help me out here. Right now I have filter on both hoses one that use to go to the intake pipe and one that use to go to the intake manifold pipe. Is this ok?

2 When i turbo my car what am i going to have to do? is my current setup going to be bad?

 

The best way IMO to do this on a tC would be to run a catch can off both valve cover ports and then use a vacum source off the MAF pipe. This will create the vacum needed and allow the catch can to "catch" the oil. We could make some type of bolt on kit if there was enough of you that wanted one. It could work for you N/A and S/C guys

 

SO IS DETONATION INEVITABLE WITH MILEAGE ON
AN AFTERMARKET TURBO'D TC

 

That is the right way to do it.

Much, much better than exhaust scavenging and would help maintain emissions issues by feeding it back thru the intake.....oil free.

 

No, not the case at all. There is the potential with any forced induction for detonation...Turbo or supercharger. That is why factory or aftermarket kits require higher octane gas.

Turbos have been around for half a century...the technology is well covered and obviously reliable if proper maintenance is done.

 

stop typing in caps...every post by you I have seen so far has been in capital letters...it is actually considered yelling when typing with the caps lock on so please refrain from it in the future. Just givin you the heads up before the mods come and warn ya.

 

WHAT WAS THAT? cool man; thanks for the heads up kid

 

good way to bring this up ScionDad, very good

i was thinking about this in school yesterday while sitting in climate control b/c we were talking about boost and blow-by

i think we will all be ok though, no one is putting any considerable amount of power out on their daily driver, nor does anyone have new pistons/bore done to their block either we be aiight, but once again ScionDad lookin out for us!

Oh yeah hows ur daughter likin the tC still? She doesnt want a civic si does she lol

 

Forgive me for being more of a noob, but let me see if I understand what this solution is for.

Is this just a recommended setup for turning our tC's into F/I beast? Or is this just a safeguard in the event that we accidently use lower octane gas, or get a bad batch of gas?

 

I dont really understand what a blow by is, and i cant seem to visualize where the oil catch cans should be....so i guess if anyone wants to explain if they have the time, would be great.

I am looking some stuff online, but i never knew that this could cause problems, i always think of mechanics as mechanics and not really.....in this sense...really lost...lol
But nice topic ScionDad, never seems to give up.

 

Heres a pretty much lameman's term for "blow-by"

Compressed fuel and air mixture burns in the cylinder on the top of the pistons. When the rings become tired and worn they allow some of this compressed and burning mixture to leak past and escape into the crankcase. That is called "blow by".

Mechanics are never lost, people just call us scumbags

 

Well, here's the story. The crankcase, that which contains the crankshaft and connecting rods, is the bottom side of the engine - you can see the bottom of the pistons from under there. Compressed fuel and air mixture burns in the cylinder on the top of the pistons. When the rings become tired and worn they allow some of this compressed and burning mixture to leak past and escape into the crankcase. That is called "blow by".

In old engines that blowby simply vented into the atmosphere via a tube called a crankcase vent tube. The EPA found bad stuff in that blowby gas and mandated that the engines must suck up that stuff and burn it to render it harmful in some other way. In came the PCV which stands for Positive Crankcase Ventilation

This system makes the engine suck the junk out of the crankcase via the PCV Valve into the intake manifold and back thorough the system. Well, in a forced induction system, the pressure in the intake manifold actually can push the PCV valve shut since once in boost, the system no longer has a vacuum to suck, but a pressure of forced air.

The right way to do it, is to take the top 2 as proposed, place that into an oil catch can and then output that can back into the intake tube with the MAF providing massive suction. Now....you are vented.

 

LOL....i got mine from my UTI book......

where did u get urs?