PCV valve questions

[Pythias]

Go back in time...


When I had my 1098 (10cc 2" mains) rebuilt, it came back WITHOUT the little pancake breather thing. It shows up in pics of the Holy Sprite. Instead a rubber hose was run directly from the manifold to the cannister. ?

After years of running this configuration, I've finally located a replacement, with a good diaphram.

The Question.. to what end? What is the purpose of the pancake thingy? Will putting it back in the system relieve high crankcase pressure? I tend to blow more oil at high rpms's .. will it help? does it hurt? .. what's the Dealeee-O?

 

[Jim_Gruber]

Without that on Bugsy's 1098 I had the Exxon Valdez with oil coming out the rear seal. THe PCV valve fixed all of thiat on my 1098.

 

[jvandyke]

FWIW
My '63's 1098cg (earlier than yours) had hose from rocker cover to Weber's air filter housing and a pipe coming out of the side cover inspection plate down toward the road. It leaked out of the this pipe.
I drilled and tapped a hole in the intake manifold and used that instead of air filter housing. Leak stopped. Mine predates the timing cover vent and the cannister equipped inspection cover pipe but even so, it doesn't leak anymore from anywhere except one spot that I'm 90% sure is the fault of the spin-on filter adapter rig job.

 

[Jer]

Wow ! I can't believe you weren't smoking out a city block 24/7 without the pcv valve -
My pcv valve was faulty on my '67 (1275cc) when I bought it - same configuration as your 1098 though as the new style pcv system came out in 68 or 69 I think ... anyways - with my faulty valve if I stopped hard causing oil to slop forward it would smoke out a small town & if it was going down a steep slope or under load I would rid the area of bugs for the year.
Ordered a complete new PCV from Moss & haven't had an issue since. Not sure exactly how the valave works but there is a diaphram & spring so I would have to assume that it regulates the flow of crankcase gases/pressure as the intake vaccum increases/decreases...

 

[Pythias]

Turns out the builder put some sort of small inline PCV valve screwed directly into the manifold where the nipple for the pancake type usually goes. I thought there was NOTHING there. I found it when I pulled the hose to do the pancake installation! Who KNEW?

 

[jvandyke]

On mine, I restricted the hole size so maybe that helps keep the oil ingestion to a minimum. I think this was pretty common as my 1970 Opel's 2,0 CIH motor had the same set up, small diameter hose from valve cover right to intake, hooked to a very small ID tube.