Pcv

[Gene1949]

I tig welded a 45-degree offset because the auto manufacturers designed grommets to set their PCV valve in the vertical for a reason. Others here have theirs laying @ 45 degrees in the road tube bore.
The Edmonds intake is a true dual plane. I tried using the existing port (on the side) as the vacuum source but could not get a consistent idle. The block is made from ¾” aluminum with 2 ports. Both ports “split” the bores under each butterfly providing sourcing from each side of the motor. Rear (under secondaries) is for PCV and front (under primaries) is for vacuum advance.

Parts

1¼” exhaust tubing mitered 45*
V-188 PCV value (Standard ignition product)
Rodney Racer [Mr Gasket] grommet #6376 trimmed to fit.


Cooling
Late 90s Taurus SVO shroud and 2 speed fans. Practically a bolt in with 80s-90s Volvo relay/circuit breaker package and high/low temperature switches in bottom tank


Please enjoy and I hope some food for thought. I think I improved the cooling and throttle response. This car gets driven a lot on road trips. It sits for a month or 2 at a time but when the urge strikes pack a bag and hit the road. I got tired of chasing [almost] nonexistent ignition and fuel parts of questionable reliability. Same with the cooling. IF I ever broke down, the car had to be able to be fixed on the road with parts sourced from NAPA or the like.

[51 MERC-CT]

Cut the original draft tube to get a 45 deg. angle over 10 years ago to come up with this combination of components.

[Gene1949]

Thankx. Thought about cutting mine too but someday somebody might need that part. Free to a good home.

[Will D]

Thanks for posting Gene1949. Always nice to see different solutions and ways of doing things.

[Phil Gillespie]

8BA Engine.
So have the PCV fitted at front of inlet manifold adjacent to Oil Filler.
But I have then just run a 3/8 hose down front side of engine?
Should this be plumbed back into inlet manifold? below carb?
Phil NZ

[51 MERC-CT]

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0

Originally Posted by Phil Gillespie

8BA Engine.
So have the PCV fitted at front of inlet manifold adjacent to Oil Filler.
But I have then just run a 3/8 hose down front side of engine?
Should this be plumbed back into inlet manifold? below carb?
Phil NZ

Yes, into a vacuum source from the intake manifold.

[Phil Gillespie]

ok thanks for that.
But the road draft tube just went down the side of the engine.
The set up I fitted with PCV valve is located where original road draft was.
What is the purpose of now returning back into inlet manifold?
Thanks
Phil NZ

[V8COOPMAN]

Originally Posted by Phil Gillespie

ok thanks for that.
But the road draft tube just went down the side of the engine.
The set up I fitted with PCV valve is located where original road draft was.
What is the purpose of now returning back into inlet manifold?
Thanks
Phil NZ

Instead of going off into the atmosphere, it is now re-routed back into all eight combustion chambers to be mixed & RE-burned, hopefully MORE-thoroughly, hence.....reducing pollution. DD

[Phil Gillespie]

Originally Posted by V8COOPMAN

Instead of going off into the atmosphere, it is now re-routed back into all eight combustion chambers to be mixed & RE-burned, hopefully MORE-thoroughly, hence.....reducing pollution. DD

Ah Clean Green got it. Our lot here are really pushing for EV's so maybe this wont be a problem. lol.
Phil NZ

[Fatheads4ever]

Originally Posted by Phil Gillespie

ok thanks for that.
But the road draft tube just went down the side of the engine.
The set up I fitted with PCV valve is located where original road draft was.
What is the purpose of now returning back into inlet manifold?
Thanks
Phil NZ

Hi Phil.. By plumbing the tube back to the intake vacuum source you create a negative pressure in the crank case that scavengers all the blowby and moisture muck. Also it helps the pistons slide down the bores because of reduced pressure behind the pistons. Also it should reduce any oil leaks out the front and rear seals, again because or the lack of crank case pressure. It might even stop it smoking when you gun it after sitting at the lights idling by pulling back oil from the intake valve guides.
Just my opinion.

[Gene1949]

Cleaning the air a bit is always a good option. My reason is the Mojave Desert (northwest of Las Vegas) is a bit dusty and I wanted to seal the engine off as much as possible.
Eventually the car will be given to my daughter and it needs to be as bullet proofed as possible (her and her husband are mechanical zeroes). LOF once a year and no fuel or ignition problems for many years is what I'm striving for. In Oregone it's pretty damp and sealing the motor will eliminate some of the internal moisture I experienced up there even though I run 180* Tstats
Looking back I should have probably run 190s

[V8COOPMAN]

Originally Posted by Fatheads4ever

Also it helps the pistons slide down the bores because of reduced pressure behind the pistons. Also it should reduce any oil leaks out the front and rear seals, again because or the lack of crank case pressure.

Yes, one of the benefits of PCV Valve is that it reduces/relieves crankcase pressure.

BUT....I kind'a doubt that it will "help the pistons slide down the bores", as whichever ones are sliding DOWN, there will be an equal number 'sliding' back UP their respective bores, causing a 'cancelling-out' effect in total. That's just how physics works. DD

[Phil Gillespie]

8BA Engine. Removed fuel pipe stand drilled and tapped for 1/4" bsp and ran hose from PCV valve at front of manifold into here. So I have it corrrect now, interested to see how it performs.
Phil NZ

[bigd1101]

What do you do with the old vent tube when you set this new vent system up?

[51 MERC-CT]

Originally Posted by Phil Gillespie

8BA Engine. Removed fuel pipe stand drilled and tapped for 1/4" bsp and ran hose from PCV valve at front of manifold into here. So I have it corrrect now, interested to see how it performs.
Phil NZ

Where exactly did you tap the hole?

[51 MERC-CT]

Originally Posted by bigd1101

What do you do with the old vent tube when you set this new vent system up?

You remove it and it's components and do whatever you want with it.
Save it and watch it get old and rusty or chuck it.

[Phil Gillespie]

Originally Posted by 51 MERC-CT

Where exactly did you tap the hole?

Tapped it just above the horizontal flange where fuel pump stand connects to inlet manifold.
Phil NZ

[bigd1101]

Originally Posted by 51 MERC-CT

You remove it and it's components and do whatever you want with it.
Save it and watch it get old and rusty or chuck it.

And the hole it went into? Plug it with something?

[51 MERC-CT]

Originally Posted by bigd1101

And the hole it went into? Plug it with something?

The hole it went into on the manifold is where the PCV valve goes.

[51 MERC-CT]

Originally Posted by Phil Gillespie

Tapped it just above the horizontal flange where fuel pump stand connects to inlet manifold.
Phil NZ

Suspect that you don't have a vacuum source.
There is not a vacuum source in that area.
You could 'T' into the wiper connection.

[bigd1101]

Originally Posted by 51 MERC-CT

The hole it went into on the manifold is where the PCV valve goes.

Thanks......any modification to the hole? I bought one of those set-ups from JAMCO.

https://www.jamcosuspension.com/prod...ve-kit-pcv4953

[51 MERC-CT]

Originally Posted by bigd1101

Thanks......any modification to the hole? I bought one of those set-ups from JAMCO.

https://www.jamcosuspension.com/prod...ve-kit-pcv4953

Should not have to be any.

[theHIGHLANDER]

Lets also remember to keep the vented cap clean. with a PCV in use it's getting it's intake of atmosphere through the vented oil caps in these cars so road debris will be collected there over time.

Benefits of a PCV system include, but not limited to:

reduction of spent gasses collecting in the crankcase and promoting sludge build up

greating an atmosphere negative, or "depression" in the crankcase to aid in ring seal

reduction in road draft debis in underside areas of the car

aids in front and rear crankshaft seal (reduced oil leaks)

extending oil change intervals by keeping the case environment cleaner

A depression in the crankcase is always a welcome force in HP engines for all of the above reasons and more. Race fans may have noted one way valves in the header collectors of drag race cars. They are used for these reasons, especially ring seal at high operating speeds. More extreme applications actually use a vacuum pump to create case depression. PCV valves have different specs, and as I recall our sister publication (theHAMB) had quite a topic on that. Good stuff 'barners...

[Phil Gillespie]

Originally Posted by 51 MERC-CT

Suspect that you don't have a vacuum source.
There is not a vacuum source in that area.
You could 'T' into the wiper connection.

Appreciate your assistance as you kindly point out need to tee into the vaccum source at carb.
Thanks
Phil NZ

[Phil Gillespie]

So have refitted the line from PCV valve into the vaccum source for wiper and distributor.
Noted now with this set up it has dropped the vaccum gauge reading.
Suppose this would happen as now drawing from front of the gallery and oil filler tube with vent cap.
Phil NZ

[Will D]

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Originally Posted by Phil Gillespie

So have refitted the line from PCV valve into the vaccum source for wiper and distributor.
Noted now with this set up it has dropped the vaccum gauge reading.
Suppose this would happen as now drawing from front of the gallery and oil filler tube with vent cap.
Phil NZ

Someone can correct me if I'm wrong but pretty sure you need to readjust your carb mixture screws now that you've added the pcv. Adjust with with your vaccum gauge hooked up to achieve highest reading at idle.

[Phil Gillespie]

Originally Posted by Will D

Someone can correct me if I'm wrong but pretty sure you need to readjust your carb mixture screws now that you've added the pcv. Adjust with with your vaccum gauge hooked up to achieve highest reading at idle.

Thanks for that info will check it out as have a vaccum gauge permanently fitted. To also remove vaccum line to distributor as running a Chev unit
Phil NZ

[Gene1949]

Originally Posted by Phil Gillespie

Thanks for that info will check it out as have a vaccum gauge permanently fitted. To also remove vaccum line to distributor as running a Chev unit
Phil NZ

By adding the PCV to the source of your vacuum advance I would think you are screwing up the signal to it. IF I am reading you correctly. I had the same issue in my original post.

[Phil Gillespie]

Originally Posted by Gene1949

By adding the PCV to the source of your vacuum advance I would think you are screwing up the signal to it. IF I am reading you correctly. I had the same issue in my original post.

How did you overcome this then? To make a special connection just for the PCV valve below the carb ?
Phil NZ

[Phil Gillespie]

Gene Just took another look at your pics and see the PCV valve is plumbed into the front area of carb inlet. Do you have the vaccum signal to distributor at rear side?
As thinking this maybe required for my set up. A single connection at front for PCV valve
with the standard connection at rear for distributor and wipers.
Am I correct with this line of thinking?
Phil NZ

[Gene1949]

My PCV is plumbed to the rear (secondary end) of the block. What you are seeing is the distributer source (front of carb) in the block. I wanted a steady source of PCV vacuum from both sides of motor so the rear under the secondaries was the logical choice.
I sourced the distributer advance can under the primaries. My way of thinking I wanted the advance can to react a little quicker.

[Gene1949]

If you look close the rear under secondaries has a blue PCV hose attached. The distributor advance line goes goes straight for the front of the aluminum block to the distributer. The vacuum for the windshield wipers come from the stock (Edmonds manifold) location on the driver's side.
Hope this helps explain it a little better. I might being a little anal about the connections (source) but it sure runs good this way (sourced from both sides of the motor with this particular manifold). With the small flow PCV valve I chose I had to adjust the idle air maybe 1 [screwdriver] blade width fatter.

[tubman]

After reading all of this, I have become convinced that a PCV system is the way to go, so I am going to install one on my '51 coupe.

I'd put one on the "Hot Rod" engine I am just building, but I had the road draft tube chromed and it sure looks purdy.

[Phil Gillespie]

Originally Posted by Gene1949

If you look close the rear under secondaries has a blue PCV hose attached. The distributor advance line goes goes straight for the front of the aluminum block to the distributer. The vacuum for the windshield wipers come from the stock (Edmonds manifold) location on the driver's side.
Hope this helps explain it a little better. I might being a little anal about the connections (source) but it sure runs good this way (sourced from both sides of the motor with this particular manifold). With the small flow PCV valve I chose I had to adjust the idle air maybe 1 [screwdriver] blade width fatter.

Gene, Thanks for extra clarifcation that helped a lot.
Phil NZ

[blucar]

PCV 101.. The purpose of the valve in the PCV is to provide open vacuum to the crankcase, upon accelleration the valve snaps shut, thereby providing vacuum to the advance, releasing the throttle allows the system to return to open vacuum.
I had a problem with a '63 Chevy 230 CID 6 in 1963, the engine would stumble, hesitate on accelleration. Took the truck to the local Chevy dealer. When I got the truck back it would still hesitate under full throttle, took the truck back to the dealer several times. I finally got out my factory manual, which I use to buy every time I bought a new vehicle. Looked under tuneup and emissions. The purpose of the PCV and the importance of keeping it clean was clearly defined in the manual.
I went back to the Chevy dealer, showed them the section about PCV's, Amazing, they did not have a current manual in the shop.
The solution to the problem on the 230 engine was a new PCV, the original PCV was defective.

My fathers theory of not letting the directions on the can outsmart you held true again.

[51 MERC-CT]

Originally Posted by blucar

PCV 101.. The purpose of the valve in the PCV is to provide open vacuum to the crankcase, upon accelleration the valve snaps shut, thereby providing vacuum to the advance, releasing the throttle allows the system to return to open vacuum.
I had a problem with a '63 Chevy 230 CID 6 in 1963, the engine would stumble, hesitate on accelleration. Took the truck to the local Chevy dealer. When I got the truck back it would still hesitate under full throttle, took the truck back to the dealer several times. I finally got out my factory manual, which I use to buy every time I bought a new vehicle. Looked under tuneup and emissions. The purpose of the PCV and the importance of keeping it clean was clearly defined in the manual.
I went back to the Chevy dealer, showed them the section about PCV's, Amazing, they did not have a current manual in the shop.
My fathers theory of not letting the direction on the can outsmart you held true again.

Although the valve may perform some functions as you suggest, it's most important function is to prevent a crankcase explosion in the event of a carburetor backfire.