Mopar Muscle Association UK

Im intrigued by the mechanics of this now.....

It's using engine vacuum to draw the crankcase gases into the intake to be burnt, or as I prefer to see it, contaminate the intake charge
I really can't see it will make much difference which cover you are drawing from.

Blue wrote:...... or as I prefer to see it, contaminate the intake charge

Yep, you never see it on race cars, they scavenge using the exhaust system.

Just an emissions thing,stops city streets getting filled with oil vapour. I always used to run a pipe from breather in to chassis rail.

Pete wrote:

Blue wrote:...... or as I prefer to see it, contaminate the intake charge

Yep, you never see it on race cars, they scavenge using the exhaust system.

You rarely even see that these days, racers tend to use Vacuum pumps which are much more effective at cutting down internal pressure.

not sure if this is any help , the answer to which side rocker cover is best for the PCV valve , to be honest , I never gave it any thought , for a street car , what ever was the factory location! was good enough for me . then along came the internet read a few times , on our type of cars ! the pcv valve is best on the left side rocker cover, due to engine rotation etc . seemed to make sense to me , then one day on dodgechargerdotcom the question cropped up which side does the pcv valve go or is best ( been looking for the thread , not found it yet ) it went something like this , few replies were mines on right side from the 68 /69 mob , the 70 & later guys said left side is better ! & in fact that's why Chrysler swapped them to the left side , for the 1970 model year . then one reply said !it does not matter which side the pcv valve is on , because the lifter valley is not sided ie separate right & left side of the motor , all the blow by gasses , just rise up & collect in the lifter valley / rocker covers , the engine don't care what side the pcv valve as long as , a open or closed breather are on the opposite side . when Chrysler changed the pcv valvelocation , from the right side to the left rocker cover .was is a coincidence , that the emissions & vapour control standards , was becoming more stringent! , requiring 3 or more fuel/ vapour lines to run from carb bowl / modified breather cap to charcoal canister & other devices , before going back to the fuel tank ( depending on where sold new & what year etc. now to run these extra vapour lines & said other emission canisters etc up the left side & have these charcoal canisters mounted on the left inner wing ( which there is hardly any space already ) would cost more time & money & agro . would be / is much cheaper easier & quicker to clip3 or 4 lines together & run them all up the right hand side , as a fuel & vapour line has been doing for many years before .the right hand side inner wing is pretty much empty too , compared to the driver side. as long as your pcv valve is working properly & you have a closed or oped breather on the opposite side , it wont make any difference . long time ago , I was going to swap mine to the left , but after reading said thread on DC.com , it made sense to me , &left it as factory . ! factory put mine on the right , so that's good enough for me if mine was a 70 & later model & I would keep it on the left , because that's where the factory put it haha .
going off on a tangent a little , if you have a radical cam & auto trans with a tight converter & you try to calm the idle speed down to a sane level on the street , the pcv valve wont work properly because they don't create enough vacuum , most race motors have no pcv valves , & open breathers / or some other crank case evacuation set up , & PCV valves cost power , like what Blue said ! diluting the fuel air mixture .
waffling on a bit now & don't quote me on this , cant quite remember this 100% it was something I read , long before the internet , back in the day or when out cars were newer , PCV valves were not just sold by metal one 69 & earlier or 70 & later white plastic ! , they were sold by colour coding ring on the plunger end , I presume spring tension inside , , cant remember for sure , but it was something along these lines , unless ive got mixed up with something else , will have a search for said info

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Very interesting Steveo....thanks for that detailed explanation

Cheers Steve

yep,definately need a breather on other rocker cover,otherwise engine can't draw air in.Also because you have ally valve covers a lot of them did not have a baffle covering the pcv valve,so it will draw oil through it.

rogthedodge wrote:yep,definately need a breather on other rocker cover,otherwise engine can't draw air in.Also because you have ally valve covers a lot of them did not have a baffle covering the pcv valve,so it will draw oil through it.

thanks - so glad I consulted this forum

Whether it was the thicker gasket or simply adding the missing breather to counter the PCV valve - the problem is solved and I love you all !
Sun is out, no more oil in the engine bay - off for a cruise !
Happy as Larry

Great news....well done and enjoy the Sun!!!!

Good news.

Well done, and thanks to all who helped!

Excellent news