Oil sucking PCV

Scotty C · #1 (**permalink**) 05-09-2005, 07:48 AM

I just discovered my carb is drawing oil through the PCV valve on the valve cover ......does anyone know how to prevent this...?????.......the valve covers are finned Le Mans type .......now I know where all the oil is going....................

......thanks for any help........

vettestr · #2 (**permalink**) 05-09-2005, 09:14 PM

Hey Scott,
You mentioned oil being pulled into carb via the PCV valve. Your valve covers should have an internal baffle or at least a tin plate to stop or reduce oil splash being drawn/sucked into carb with the vapor it is intended to remove.
If you have a baffle and just a little oil then maybe it is just forming oil in the low and cooler area of the hose from vapor rain out. It may not be a big deal.... I hope

mikiec · #3 (**permalink**) 05-09-2005, 10:38 PM

That engine is shot. I'll trade you mine for it.

See you Sunday.

Mike

John-Tucson · #4 (**permalink**) 05-09-2005, 10:53 PM

Scott, I didn't know that you had installed a diesel. What happened to the 428 that was in your Cobra ? Have you given Bernie a call at 887-4929 ? He may have the answer for you. John

mj_duell · #5 (**permalink**) 05-10-2005, 04:19 AM

I have the same set-up that you have. My guess is you are missing the plate on the inside of the Lemans valve covers like vettestr mentioned. I have also heard that running the PCV on the drivers side instead of the passenger side of the motor can cause this, but I don't know if that is true. Also you may want to check and see if the PCV is stuck open. The amount of oil you are sucking into the intake through the carb is probably minimal and I would not worry. I have more of a problem with those Lemans covers leaking oil all over the heads and smoking!

--Mike

trularin · #6 (**permalink**) 05-10-2005, 06:05 AM

It does not matter what side you run the PCV on. The information relative to the Baffle is 100% correct and will fix 90% of the oil draw through the carb.

I should mention that the crankcase must be vented for the PCV system to work properly. If you are venting to the air cleaner or "breather" you will need to baffle the vent port as well.

If there are no provisions for a baffle, you can fashion with SS sheet metal and a few small hand tools. Remember, the baffle is used to stop oil from splashing in the port. Therefore, it should allow any oil to drain back into the valve cover and down into the engine. You can drill a hole on each side of the port and pass a long screw on each side to secure the baffle over the hole. I used chromed acorn nuts to finish the installation.

Make absolutely sure you use locktite or some form of retension to make sure the screws and baffle do NOT come loose.

Hope this helps.