S13 PCV Valve Size? / Proper Crankcase Evacuation?

[supra33202]

Is it 3/8" NPT? I can't find the answer online.

http://shop.oreillyauto.com/Pr...Set=A

[supra33202]

Please help!

[D-UNIT]

what are u trying to do? A brand new pcv valve is only like 11 bucks from the parts store.

[supra33202]

what are u trying to do? A brand new pcv valve is only like 11 bucks from the parts store.

For my KA-T, I want to remove the PCV valve and connect an adapter to the air box and run a hose to a catch can. Basically, I want to vent the engine blowby to a catch can and atmosphere.

Right now, I need to know the fitting for the PCV valve and buy an adapter.

[WDRacing]

It has to have vacuum to pull the gasses out. Or else you could just open the valve cover breather and do the same thing. The PCV prevents the crankcase from being pressurized.

YOU NEED CRANKCASE EVACUATION.

[supra33202]

http://www.honda-tech.com/showthread.php?t=697498

After reading ton of PCV system threads from Nissan, Honda, etc., the only ways to create vacuum are to connect PCV valve to exhaust or install electric pumps.

Connect the PCV valve to intake is not a good idea, because having unmetered air entering intake will create idle/tuning issue, and the PCV valve will shut under WOT/boost.

Venting PCV and valve cover breather to atmosphere is not the best way, but it works fine for many people. I saw many professional race car/drift car also use this setup.

I think I will connect the PCV valve opening and valve cover opening to a oil catch can with a breather. So the crankcase pressure will be vent to atmosphere freely (no PCV valve).

http://cgi.ebay.com/ebaymotors....m245

[WDRacing]

http://www.honda-tech.com/showthread.php?t=697498

After reading ton of PCV system threads from Nissan, Honda, etc., the only ways to create vacuum are to connect PCV valve to exhaust or install electric pumps.

Connect the PCV valve to intake is not a good idea, because having unmetered air entering intake will create idle/tuning issue, and the PCV valve will shut under WOT/boost.

Venting PCV and valve cover breather to atmosphere is not the best way, but it works fine for many people. I saw many professional race car/drift car also use this setup.

I think I will connect the PCV valve opening and valve cover opening to a oil catch can with a breather. So the crankcase pressure will be vent to atmosphere freely (no PCV valve).

http://cgi.ebay.com/ebaymotors....m245

Your idea is awful. But you have read enough to know that. I'm saying it's a bad idea so that others don't think it's going to work...cause it won't.

Ask yourself this. Is it easier to rethink the entire design that has been used since like 1988 on ALL turbo cars? Or is it easier to make it better? Your current idea provides no vacuum to the crankcase. You're effectively contaminating your oil with fuel and carbon...

[Doya]

What is the right way to set up a catch can. I've been searching but haven't been able to find out exactly how.

[supra33202]

What is the right way to set up a catch can. I've been searching but haven't been able to find out exactly how.

I've been looking for a correct way to setup can catch & pcv system too. It seems like there are many different ideas out there.

This is my original thread.

zer...setup

[WDRacing]

I'll have more time to lay it out later...im busy right now. The key is vacuum of "some" type. Be it header mounted, intake vacuum or GM Vac Pump they all provide some type of vacuum in the crankcase. Without vacuum you're oil will quickly become tainted with carbon and fuel, especially on boost.

[D-UNIT]

http://www.honda-tech.com/showthread.php?t=697498

Connect the PCV valve to intake is not a good idea, because having unmetered air entering intake will create idle/tuning issue, and the PCV valve will shut under WOT/boost

Actually believe it or not the ecu does account for pcv air ie it is metered. My car idles funny when I take that hose off. Well this not the best way but this is how I did it. PCV -> catchcan -> inlet of turbo after the MAF. At idle the turbo is sucking in a fair amount or air , but when you are boosting more than enough air is rushing though that pipe to suck out crankcase gases. And it is still a closed system so no weird idling or ecu issues.

[WDRacing]

Actually believe it or not the ecu does account for pcv air ie it is metered. My car idles funny when I take that hose off. Well this not the best way but this is how I did it. PCV -> catchcan -> inlet of turbo after the MAF. At idle the turbo is sucking in a fair amount or air , but when you are boosting more than enough air is rushing though that pipe to suck out crankcase gases. And it is still a closed system so no weird idling or ecu issues.

This method is the most common, but is operating at about 25% compared to the stock system by itself. So you're actually losing 75% of the suction by doing this. So common doesn't make it right.

There is no vacuum before the turbo on or off boost. When you are ON boost the amount of airflow is negated by the increased amount of blowby do to combustion pressure / cylinder pressure.

WD

[WDRacing]

I'm going make a new thread today that outlines the various ways to properly evacuate the crankcase along with the ones that don't work to well.

Then I'll add it to the FAQ.

WD

[supra33202]

I'm going make a new thread today that outlines the various ways to properly evacuate the crankcase along with the ones that don't work to well.

Then I'll add it to the FAQ.

WD

Cool. Looking forward to see your FAQ.

Thanks!

[Doya]

Sweet

[supra33202]

I'm going make a new thread today that outlines the various ways to properly evacuate the crankcase along with the ones that don't work to well.

Then I'll add it to the FAQ.

WD

Cool. Looking forward to see your FAQ.

Thanks!

[WDRacing]

Cool. Looking forward to see your FAQ.

Thanks!

Ever watch "Beerfest"? Thats how my last 2 days were spent...lol. I'll get that write-up knocked out today. Sorry guys...life kidnapped me and beat my @$$.

[Doya]

Ever watch "Beerfest"? Thats how my last 2 days were spent...lol. I'll get that write-up knocked out today. Sorry guys...life kidnapped me and beat my @$$.

I celebrated my B.D. last weekend and things got a little crazy Didn't feel too good the next day though
Modified by 95ka24de_zenki at 1:00 PM 8/25/2009

[Chris28]

Since we are on the topic...I'm probably going to put an exhaust scavenging crankcase evacuation thing on to my downpipe along with a check valve thing.

I should do this after the WBo2 sensor correct? Would placement of the scavenging pipe affect how much vacuum it is able to pull? My o2 sensor is about in the middle of the "straight" part of my downpipe, so the scavenging pipe would have to be mounted about 4 inches pre-cat.

[WDRacing]

Done

zerothread?id=446254

[supra33202]

Done

zerothread?id=446254

WD, thanks for the guide!