What is the purpose of installing this? Are you wanting to prevent blowback during a backfire?

 

Apparently there is a plastic bit in the passenger side valve cover which plays a part in the PCV system -- Doing this inline mod would let you delete that plastic piece because it gets super brittle and breaks etc.

 

It also makes it a much quicker item to service vs removing the intake & valve cover to gain access to the plastic baffle. Basically something most other automakers have been doing for years lol.

 

Hmm, I'm still confused, blowing from the nipple side and sucking from the threaded side is the same flow direction, both should flow freely. The one that should not flow is blowing from the threaded side or sucking from the nipple side (backfire prevention as someone mentioned - although not really a frequent problem for fuel injected engines).

If it does flow the correct direction - excellent find! I was not aware there were any that original threaded in to the intake manifolds. Kind of a bummer you had a hard time finding it. That is the one thing about the FV237 is it was a common pn for older Chevy inline 6's (also about the same displacement at 230-256 cu in so flow is similar).

 

Worse than that it totally clogs, causing a pressurized crankcase resulting in oil leaks, deformed intake gaskets, and the formation of sludge in the engine.

 

Yes if you blow from the threaded side = no flow or suck from the nipple side = no flow. Sorry for the confusion. When I looked around I specifically was looking for one mounted on the intake. I used to have a Mitsubishi & thought I remembered it being on the intake. Then I found the one for the Honda which mounted on the intake with 1/4 threaded base.

Also thanks for the explanation above!

I think I know why it was kinda hard to find locally. It’s all metal design really means it’s not a part that fails that often (if it sticks just clean it with carb spray/brake clean & re-install) and second I haven’t seen any 88-90 Honda Civic’s in my area honestly. Online finding them is a breeze, but I wanted one ASAP. Napa said they always stock them. I’ve noticed with certain parts some stores will stock em & others won’t like the K&N oil filter for my LR3.

 

Hurry up and test it, lol!
$8 shipped on ebay.
I'm buying one if it works.
Hope to get my block and crank back from machine shop by the weekend.

 

I don’t see why it won’t work. Flow is correct, threads on, and even the OEM hose fits on it nice & secure (unlike some of the 1/4 x 3/8 metal nipples). I’ll probably grab 2 more & install em on my 99 & 02 (won’t have the baffles removed yet), but I could test it anyways.

 

Image result for what is an auto PCV
The positive crankcase ventilation or PCV valve is an inexpensive and often overlooked component. It is also one possible cause of expensive oil leaks and sludge buildup in an engine. All automotive engines are lubricated with oil and when oil is churned by moving parts, pressure is produced.
What are the Symptoms of a Bad PCV Valve - AGCO Automotive

AGCO Automotive Repair Service - Baton Rouge, LA - Detailed Auto Topics - What are the Symptoms of a Bad PCV Valve

This might help Best4x4.

In my (limited ) experience the PCV is designed to allow any crankcase pressure out by a flap or one way valve but restrict intake pressure into the crankcase thus relieving crankcase pressure only to avoid any seal leaks etc.

Many PCV's from many vehicles will work OK provided the pressure and pipe diameter is similar and the direction is correct.

 

Thanks, I'm going to try one.
I've been looking for an alternative to that stupid $20 piece of spiral plastic.