how much harm is it really doing to the motor? The pcv system has been on just about everything I have owned. Including a Tacoma with 235000 miles and a pathfinder with just under 300000 miles. No engine work to either and still running strong when I sold them. My point is what harm is being done? If it was harmful wouldn't we be seeing early engine failure on all vehicles with a pcv system? Or is it harmful in some other manner? Would like to know so I can make an informed decision. If had to guess I would say in the pcv system early years it probably did more harm then good but now it probably works well enough without doing any harm to an engine if any at all.

 

A stock use type of setup you will probably never notice it, but when you add on turbos or blowers or nitrous and start making double the stock cylinder pressure then things like oily valves and ingesting garbage tend to matter a lot more.

 

yes. plus you are adding hot air to the intake charge which can be an issue in boosted applications. i also think i read somewhere the introduction of oil vapors actually lowers your AFR.

 

That makes sense. So maybe I will leave mine disconnected and route the can somewhere I cannot smell it.

 

In regards to a gas motor that you don't hot rod, you probably won't notice it.

I'd be willing to bet that 99% of the people on this or any other hot rod forum have seen in person or in a picture what an ls motor looks like when you remove the intake manifold after it has been run for 80-100k miles stock. The intake ports and valves are almost always caked up with burnt oil residue to the point that you can't even see any aluminum. As I said above, in a stock situation, no big deal. It's when you start hot rodding that it becomes an issue because you will run into knock earlier than someone with a cleaned intake/heads and not running a pcv system anymore.

What I have hi lighted above is the point I'm trying to make. Bone stock **** very rarely sees much WOT and when it does, the factory has **** built into the tune up so that it won't rattle itself to death while ingesting the polluted intake charge. So: Stock = Fine, Hot Rod = Clean your **** up. lol

 

That's why I would put a catch can on.
To catch the oily/dirty air.
Most street trucks spend more time cruising then at WOT.

Even none PCV. I would still run a catch can.

 

Catch cans......check.

One for each side feed by -12 lines coming off each valve cover. Can't find a pic of the one on the driver side.