06-18-2021, 07:53 AM | #1 |
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Pcv
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. |
06-18-2021, 08:31 AM | #2 |
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Re: Pcv
Cut the original draft tube to get a 45 deg. angle over 10 years ago to come up with this combination of components.
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06-18-2021, 11:42 AM | #3 |
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Re: Pcv
Thankx. Thought about cutting mine too but someday somebody might need that part. Free to a good home.
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06-18-2021, 01:31 PM | #4 |
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Re: Pcv
Thanks for posting Gene1949. Always nice to see different solutions and ways of doing things.
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06-18-2021, 01:43 PM | #5 |
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Re: Pcv
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 |
06-18-2021, 02:07 PM | #6 |
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Re: Pcv
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06-18-2021, 04:25 PM | #7 |
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Re: Pcv
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 |
06-18-2021, 04:53 PM | #8 | |
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Re: Pcv
Quote:
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 |
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06-18-2021, 05:20 PM | #9 | |
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Re: Pcv
Quote:
Phil NZ |
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06-18-2021, 07:46 PM | #10 | |
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Re: Pcv
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Just my opinion. |
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06-18-2021, 08:00 PM | #11 |
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Re: Pcv
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 |
06-18-2021, 08:08 PM | #12 | |
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Re: Pcv
Quote:
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 |
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06-21-2021, 12:01 AM | #13 |
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Re: Pcv
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 |
06-21-2021, 04:26 AM | #14 |
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Re: Pcv
What do you do with the old vent tube when you set this new vent system up?
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06-21-2021, 04:36 AM | #15 |
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Re: Pcv
Where exactly did you tap the hole?
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06-21-2021, 04:41 AM | #16 | |
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Re: Pcv
Quote:
Save it and watch it get old and rusty or chuck it.
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06-21-2021, 05:18 AM | #17 |
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Re: Pcv
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06-21-2021, 05:37 AM | #18 |
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Re: Pcv
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06-21-2021, 05:43 AM | #19 |
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Re: Pcv
The hole it went into on the manifold is where the PCV valve goes.
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06-21-2021, 06:09 AM | #20 | |
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Re: Pcv
Quote:
There is not a vacuum source in that area. You could 'T' into the wiper connection.
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06-21-2021, 08:46 AM | #21 | |
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Re: Pcv
Quote:
https://www.jamcosuspension.com/prod...ve-kit-pcv4953 |
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06-21-2021, 09:03 AM | #22 | |
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Re: Pcv
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06-21-2021, 10:10 AM | #23 |
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Re: Pcv
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... |
06-21-2021, 05:08 PM | #24 |
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Re: Pcv
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06-21-2021, 08:30 PM | #25 |
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Re: Pcv
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 |
06-22-2021, 12:09 AM | #26 | |
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Re: Pcv
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06-22-2021, 12:31 AM | #27 | |
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Re: Pcv
Quote:
Phil NZ |
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06-22-2021, 08:44 AM | #28 |
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Re: Pcv
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.
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06-22-2021, 03:59 PM | #29 | |
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Re: Pcv
Quote:
Phil NZ |
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06-22-2021, 04:17 PM | #30 |
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Re: Pcv
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 |
06-23-2021, 08:58 AM | #31 |
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Re: Pcv
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. |
06-23-2021, 09:15 AM | #32 |
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Re: Pcv
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. |
06-23-2021, 09:39 AM | #33 |
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Re: Pcv
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. |
06-23-2021, 04:17 PM | #34 | |
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Re: Pcv
Quote:
Phil NZ |
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06-23-2021, 05:26 PM | #35 |
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Re: Pcv
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.
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06-23-2021, 09:17 PM | #36 | |
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Re: Pcv
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