#1
IP: 207.106.217.129
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Side (Valve) Cover Plate
Does anybody know if the late model side (valve) cover plate fits on an early model block? I have an early block that I'd like to install the newer valve cover plate on so I can potentially upgrade to the PCV system easier (and in the mean time buy a new slash tube from our host).
Thanks.
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Scott |
#2
IP: 174.94.33.109
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You should maybe ask ndutton about this?
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#3
IP: 172.8.28.57
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sglazebrook, Based on the Universal master parts manual, it would appear that the later side cover plate will fit on an early block. Ken, in parts should be able to confirm this. Now for my real reason for answering this question.
Many of us, including N. Dutton, feel that a PCV valve is more of a "Band-Aide" rather than an "up-grade". With a correctly installed slash tube along with proper ignition timing, our A4s are running very "fume free" without the need of additional fuel metering adjustments brought on with the addition of a PVC "vaccum leak". Tom |
#4
IP: 107.0.6.242
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One of Our Favorite Discussions
Thd downside of the slash tube is that it dumps the oily mess (with dust) directly into the arrestor, and thence upstream of the carb's jet system thus contributing to schmutzy jets which we are always talking about. Gosh I love this subject.
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#5
IP: 24.152.131.153
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Quote:
I have no idea about sideplate interchange, previous advice to ask Ken in parts is the way to go. Now, for the sideshow: Quote:
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I'll tell you how. My engine isn't worn (yet) to the point my blowby is excessive and when it wears to that point I'll rebuild it. Oily arrestors and schmutzy jets are not . . . wait for it . . . . ubiquitous with slash tubes.
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
#6
IP: 108.212.226.13
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Words
You do love that word, Neil.
H
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S/V Swimmer Bristol 27 |
#7
IP: 108.212.226.13
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Words
That is not a complaint.
H
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S/V Swimmer Bristol 27 |
#8
IP: 24.152.131.153
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I came that close - - - that close - - - to winning a set of A-4 spark plugs for that word. Lost out to eschew. Only two syllables with wimpy consonant sounds. It changed my life.
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
#9
IP: 107.0.6.242
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But there is always the consolation award:
Last edited by hanleyclifford; 07-13-2016 at 08:31 PM. |
#10
IP: 207.106.217.129
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Thanks all - that helps (I'm away from the boat and my manual - but have an opportunity to pick a side plate up cheap).
The immediate reason to consider this is not for the PCV valve, but that my slash tube is disintegrating and I need a new one, and the new ones sold here seem to be a much better design than the older style (larger, more firmly attached, and, of course, readily available). Thanks again!
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Scott Last edited by sglazebrook; 01-07-2014 at 03:50 PM. |
#11
IP: 174.94.33.109
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WOW - I need one of those...any idea where I can get one? PS - if you don't want your old early model side plate I would be willing to buy it if it is in good shape? Last edited by 67c&ccorv; 01-07-2014 at 04:49 PM. |
#12
IP: 70.166.15.66
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Finally...
I finally got the time to replace the side/valve cover plate when replacing the manifold gasket (and exhaust flange and gasket and exhaust hot section and...). After having both off the engine I think the older version plate is more substantial and less prone to bending/deformation due to its shape, but the slash tube fitting (designed originally I believe for a flex tube connector to the carburetor) is smaller diameter than later slash tubes - the latter I would imagine does a better job of removing any gasses in the chamber and with the orientation of the hole on the interior side less likely to have oil splashed out of the slash tube and into the flame arrestor!
No plans for a PCV system at this time. So, I have the old one that looks in great shape - just in need ofa little cleaning and paint.
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Scott |
#13
IP: 71.118.13.238
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Fwiw
I personally think the PCV system is the best of all the upgrades for the A-4. It is a simple devise that helps us all with the air we breath on this rock!!! It has virtually no downside other than those with problems tuning an A-4!! It is not a band-aide it is a smog devise that works to benefit the environments air we all breath with no downside in performance!!!!
I have hooked up more than a few on A-4's and re-hooked a couple too since the misinformation posted on this site. I know it is something not available here and that does not mean it is not good for the A-4 and our environment. Rant over. Dave Neptune |
#14
IP: 24.152.131.153
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Misinformation? That stings!
Truly, my prior posts about the PCV were only a differing opinion, not an attempt to misinform. I steadfastly maintain my factory original slash tube handles the blowby on my engine very well and I have a pretty sensitive schnozz.
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
#15
IP: 107.0.6.242
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Fwiw
I did a little testing on my engine with and without PCV. I discoverd that in neutral at 1000 rpm the PCV was costing me 1 to 1.5 inches of vacuum. Not sure I like that so I have purchased a snubber from McMaster and will report back on results.
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#16
IP: 142.136.107.234
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Hanley, a "snubber", not sure what you mean here.
Dave Neptune |
#17
IP: 107.0.6.242
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Snubber, a restriction fitting to modulate instrument fluctuation. I have them on my fuel pressure gauge and vacuum gauge. I have a theory that the PCV does not need the full flow of a 1/8" pipe to do it's job so I intend to drill out a .015" snubber until the PCV valve just controls the blowby with minimum vacuum "leak".
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#18
IP: 174.58.82.173
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I like that idea Hanley. Keep us updated.
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#19
IP: 142.136.107.234
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Careful
Hanley, I think you'll need a bigger bleed than that as the PCV works at high manifold pressures too. When operating at these lower vacuum a larger hole is necessary to allow the flow. At higher vacuum or low pressure the valve allows very little through via an internal control. I doubt the PCV and a snubber will work well together as a PCV valve is set up for displacement and manifold load profiles via it's internal mechanism controlled by vacuum.
You would probably be better off finding one for a similar engine but of less displacement. The amounts of air that a PCV introduces is easily compensated by the carb. This is because carbs are so far off even when they're close. Look at how much better an FI engine works for economy, a carb set-up may match it is a few spots but across the board the FI is superior. Dave Neptune |
#20
IP: 107.0.6.242
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Ran a test today on the PCV system which I have plumbed to the carb spacer plate via 1/8" NPT fittings. The engine ran at 1200 rpm with 15 inches of vacuum. Next I installed a snubber in the line drilled out with 3/32" bit. I saw 17 inches of vacuum at the same rpm. Of course I had to change carb settings, main jet and idle screw, to achieve the same fuel/air ratio. The engine runs smoother and achieves a lower idle without missing. I'm looking forward to sea trials on this with launch expected in about 2 weeks. The issue will be whether the now restricted PCV can handle the blowby at cruising rpm.
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#21
IP: 174.58.82.173
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Interesting Hanley, Why would you have a higher vacuum with a "leak"? How do you measure the air fuel ratio?
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#22
IP: 107.0.6.242
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The "leak", the PCV valve deprives the manifold of vacuum; thus depriving the PCV valve of some of it's flow restores vacuum to the manifold. I measure air/fuel ratio with a gauge and an O2 sensor. The O2 sensor is threaded into the end of the manifold. The gauge is just below the ammeter on the panel.
Last edited by hanleyclifford; 07-13-2016 at 08:29 PM. |
#23
IP: 174.58.82.173
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That is right, I remember now, that gold engine with O2 sensor. Looks good!
I am still stuck about the vacuum. In my mind, when there is a leak, the vacuum would go down, but the RPM would go up. I have to think on this. |
#24
IP: 24.152.131.153
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Quote:
Hanley, you may be in the unique position to perform actual comparative vacuum measurements because with your oxy sensor you can maintain a consistent fuel/air ratio. Please keep the results coming. This is great information regardless of the outcome.
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
#25
IP: 107.0.6.242
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Quote:
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