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12-05-2020, 05:33 PM | #41 |
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Join Date: Sep 2020
Location: San Angelo Texas
Posts: 56
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Re: “Inside” part of road draft tube
Finished the pcv valve install last night.
Installed the tube beneath the manifold. Drilled and tapped the manifold at the road draft tube location and the carb block off plate for 1/4” pipe thread brass fittings. I’m using 3/8” emissions hose currently but will go 3/8” copper line as the final setup. I tried 5 different pcv valves settling on the Borg Warner PV255. This was more about “operation” than fit. I set it up first with clear 3/8” line so I could see the “flow” of the very light oil mist as it moved from the block to the intake manifold with the different valves. The PV255 flowed the best at low vacuum RPMs and didn’t “leak” vacuum at idle or light cruise RPMs. I had a vacuum gauge setup along with my wideband gauge to keep track of lean/rich situations. The PV255 valve worked best in a vertical position. I believe this is the best valve for a hot rod flathead....it is at least of the 5 different valves I tested. I’m extremely pleased with the results. Drove the car almost 40 miles at 65-75mph this morning. Pulled into my shop and didn’t have a single drop of oil even begin to form on or around the oil pan or dipstick. Previous to this mod there would have most certainly been a drop or two at least form. It’s extremely important to make sure that if using a performance manifold with separated plenums to join the plenums in some manner. Thanks to Merc’s suggestion I was able to do this in the least invasive way. Thanks Merc! Thank all of your for your help with this little project! |
12-05-2020, 06:49 PM | #42 |
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Join Date: May 2010
Location: East Shore of LAKE HOUSTON
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Re: “Inside” part of road draft tube
.
What I figured-out during our project and in my original research on the subject is that your PCV valve selection needs to mimic the approximate cubic inches (displacement) and paying attention to the parameters of a performance camshaft. Performance cams usually allow LESS vacuum than a stock cam. We ended-up selecting a PCV valve for a 302 cu. in. (original Z28) Chevy which obviously has a performance cam, in view of the fact that Heard's new flathead is 284 cu. in. (fairly close) with a performance cam. For sure, we wanted to utilize one of those small, GM-type metal PCV valves. DD |
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12-05-2020, 07:02 PM | #43 |
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Join Date: Sep 2020
Location: San Angelo Texas
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Re: “Inside” part of road draft tube
Yep....all of the ones I tried are for engines with displacements very similar to my flathead. The one I settled on is for a 283 SBC.
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12-05-2020, 07:06 PM | #44 |
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Join Date: May 2010
Location: East Shore of LAKE HOUSTON
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Re: “Inside” part of road draft tube
But like I said, you ought to factor-in the vacuum characteristics produced by your cam. I can't think of any 'late', factory-performance 283s with a cam....that had a factory PCV valve. DD
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12-05-2020, 07:12 PM | #45 |
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Join Date: Sep 2020
Location: San Angelo Texas
Posts: 56
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Re: “Inside” part of road draft tube
All I know is that it works. The Max1 is not a radical cam.
There may be a valve that “fits” better, but I’m pleased. If you know of a better pcv valve for my engine, give me a part # please..... I’ll try it! |
12-05-2020, 07:15 PM | #46 |
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Re: “Inside” part of road draft tube
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12-05-2020, 08:09 PM | #47 | |
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Re: “Inside” part of road draft tube
Quote:
Had a small leak at the front crank seal before and virtually none after installation.
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12-06-2020, 02:09 PM | #48 |
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Join Date: Jun 2018
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Re: “Inside” part of road draft tube
Could you please post the part number for the 283 PCV valve? I would like one that has the 90 degree elbow on the top but can work around that if needed.
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12-06-2020, 02:30 PM | #49 | |
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Re: “Inside” part of road draft tube
Quote:
Quote: "I tried 5 different pcv valves settling on the Borg Warner PV255." Terry
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12-06-2020, 04:08 PM | #50 |
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Re: “Inside” part of road draft tube
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12-06-2020, 06:23 PM | #51 |
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Join Date: Sep 2020
Location: San Angelo Texas
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Re: “Inside” part of road draft tube
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03-06-2021, 04:05 PM | #52 |
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Join Date: Aug 2012
Location: Henrietta, New York
Posts: 118
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Re: “Inside” part of road draft tube
Norris, Check with Tom Stewart, of Flat Head Sales, Riga N.Y. ... He is my local flat head engine guy, who has been doing engines for close to 50 years... His number is 585-293-3203... He doesn't throw much out, so I think you have a good chance, for getting your needed tube...
.....Lou.....
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