Found Oddity on my mopar

[65coronet440]

So i was under my 65 coronet, just staring at the million things i would do if money was right and in a perfect world and i noticed 2 rubber hoses that went to my exhaust. on each side..(1 a piece)...:confused5: So naturally i traced the hoses up to my valve cover breathers!!!!:confused5::confused5:.......So what the heck are these 1/2" hoses going from my breathers to a bung in my exhaust before my mufflers...? are the functional? could i just eliminate these hoses? any suggestions help...

 

[moparker]

My Duster has the same thing but just run under car not plumbed to exhaust. Suppose to help with ventillation I guess. They were on there whem I got the car sos I left them.

 

[Cranky]

Does your car have headers? The flow of the exhaust creates a vacuum on the hoses which helps evac the crankcase. The higher the exhaust flow, the better this system works but it's not very effective with low rpm and the restriction of mufflers.

 

[Ron 73]

I haven't heard of those lately, the connections for the ventilation hose should be on the header collectors ive always been told.

 

[65coronet440]

yes, i do have headers, long tubes. and they enter the exhaust right after the collector, and then i have my mufflers which are just a open box.. so it does actually serve a purpose then. couldn't i just get those air fliter style breathers instead or does the vacume created by this set up really work. it is a street strip car so IDK

 

[anmracing]

That is an old school way of pulling the fumes out of the crankcase. It's an old drag race trick. Instead of a PCV going to the intake it goes straight out the exhaust via the headers vacuum so the fumes don't burn in the combustion chamber. It's not a good idea for an emmision sniffer test.

 

[anmracing]

BTW: Looks like Summit still sells them. I would have to say it is a race only part these days.....

 

[Budnicks]

Pan Evac systems are common place with engines that make lots of crankcase pressure from windage or blow by... It's a lot cheaper than a vacuum pump, belt, hoses & fittings....

 

[696pack]

That is an old school way of pulling the fumes out of the crankcase. It's an old drag race trick. Instead of a PCV going to the intake it goes straight out the exhaust via the headers vacuum so the fumes don't burn in the combustion chamber. It's not a good idea for an emmision sniffer test.

Which keeps the oil that would be sucked into the intake manifold with the PCV that also fouls plugs.

 

[HEMI-ITIS]

That style system has been working for 40 years.Untill I can drop a $1000 on a good vacume pump and all the stuff to go with it,I'll just stick with it:eusa_think:

 

[Cranky]

Which keeps the oil that would be sucked into the intake manifold with the PCV that also fouls plugs.

I've raced plenty of cars that still used the stock style PCV setup and never had that problem......read this and then maybe you'll have a better understanding how it works. http://www.aa1car.com/library/pcv.htm

 

[696pack]

I've raced plenty of cars that still used the stock style PCV setup and never had that problem......read this and then maybe you'll have a better understanding how it works. http://www.aa1car.com/library/pcv.htm

I think you mis-understood what I am saying or maybe I am mixing info from another thread. Nothing wrong with using standard PORTED vacuum for factory type PVC system. Here is the link to the other thread: http://www.forbbodiesonly.com/moparforum/showthread.php?t=21380

I also agree that the OPs type of system is OK because it bypasses the engine to get rid of the fumes by going directly to the exhaust. I BELIEVE the reason this is done on race casrs is because of the big cams are notorious for low vacuum at idle and therefore a build up of fumes at idle with a factory PVC sytem AND/OR stock valve covers without PVC provisions available you have to have a way to dispell them.

 

[Cranky]

Yep, I read the other thread. Most racers hook up that way in order not to dilute the intake charge with anything other than pure fuel and air. So long as an engine is vented, it'll usually run fine but if you can create some vacuum in the crank case, it'll usually free up a little bit of hp. As for full manifold vacuum on a PCV system, it won't suck oil out if the system is set up with baffles like factory valve covers have and is set up correctly.

 

[yellowdartdave]

In other words, the racers would rather burn the oily fumes in the exhaust pipes rather than in their combustion chamber !!

 

[696pack]

In other words, the racers would rather burn the oily fumes in the exhaust pipes rather than in their combustion chamber !!

Yes, that and what cranky said above which is somewhat the same as the oily fumes would effect the mix and foul the plugs just as a rich burning engine will.

 

[anmracing]

In other words, the racers would rather burn the oily fumes in the exhaust pipes rather than in their combustion chamber !!

Its not that the fumes burn with this type of system in the exhaust pipe, it forces the fumes out by bypassing the intake. Unfortunately this type of evac wreaks havoc on cats so one would not want to use this on a new car. This is a good inexpensive system.

 

[SUPERSTOCKRACER]

keep them. they work great. evac system. i use to use them ill i went to my vacuum pump systems.