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fordpower View Drop Down
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    Posted: 26-August-2020 at 9:40AM
does anyone else's 351w only carry 20lbs oil pressure at idle'It has been like this since 2002 32000 miles now has 70000. It goes up to around 50 when driving.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote californiajohnny Quote  Post ReplyReply Direct Link To This Post Posted: 26-August-2020 at 6:37PM
sounds about right for a stock pump
JOHN
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gpd294 Quote  Post ReplyReply Direct Link To This Post Posted: 27-August-2020 at 4:55AM
I always wondered about this ever since I had my 400 rebuilt. When I first start her up she's got about 80 lbs of pressure until it warms up and then at idle it's around 20 lbs or so. 

Glad to hear that it's pretty much normal. 

Thanks for the information. Clap
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Wagon my Dad bought new from McAnary Ford on June 6, 1973 in Gary,Indiana
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fordpower View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fordpower Quote  Post ReplyReply Direct Link To This Post Posted: 27-August-2020 at 10:10AM
I have been waiting for the knocking for yrs. It has always had blow by since 32000 when I bought it.
On trip to georga dip stick end cracked mad a mess of my new wires etc. It fills bottom of air cleaner on long trips like to ky.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Big Bird Quote  Post ReplyReply Direct Link To This Post Posted: 27-August-2020 at 10:28AM
For the blow-by:
Make sure the PCV is working, and you might want a catch-can on the PCV line as well.
"What we do in full frontal view, is more honest than your cleaned-up mind."
Randy
1979 T-Bird
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How the Heck does a REGULAR CAB SHORTBED weigh over 5200 pounds?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 72 RS 351 Quote  Post ReplyReply Direct Link To This Post Posted: 27-August-2020 at 10:55AM
Originally posted by fordpower fordpower wrote:

I have been waiting for the knocking for yrs. It has always had blow by since 32000 when I bought it.
On trip to georga dip stick end cracked mad a mess of my new wires etc. It fills bottom of air cleaner on long trips like to ky.


You can also experiment to find a different PCV which is less restrictive. They vary a lot.

I had an 85 Crown Vic(351W P71 model) with lots of blow by, big mess in the air cleaner often. I found a PCV which was better, but it still pushed oil out. I then cheated, I rerouted the PCV system with the PCV on the outer end, full vacuum to one valve cover. That stopped the mess in the air cleaner, and it used about a quart of oil per month(which was only a little more than before that). I don't suggest that unless it's really bad and you are prepared to watch the oil/dipstick often.
Don
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rockatansky Quote  Post ReplyReply Direct Link To This Post Posted: 27-August-2020 at 11:50AM
fordpower what oil type & weight are you running?

and do you drive it year 'round?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fordpower Quote  Post ReplyReply Direct Link To This Post Posted: 28-August-2020 at 12:59AM
only in summer. since 2018 only about 1000. Oil 10/30 valvoline.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rockatansky Quote  Post ReplyReply Direct Link To This Post Posted: 28-August-2020 at 9:44AM
and you're using an appropriate vintage / hot rod type oil that has sufficient zinc/phosphorus content for flat tappet cams?

drain, filter, fill with Rotella 15-40 and see what happens

i'd set up a catch can in the pcv line from the valve cover to the intake manifold, and disconnect the tube from the air filter housing.
you can either find a breather that fits into the tube or find a breather that fits into the valve cover, or set up a catch can for that line as well

time for an overhaul


Edited by Rockatansky - 28-August-2020 at 9:51AM
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fordpower View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fordpower Quote  Post ReplyReply Direct Link To This Post Posted: 28-August-2020 at 12:20PM
Ya been that way since I bought it in 02 37000 though 32000.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 72FordGTS Quote  Post ReplyReply Direct Link To This Post Posted: 28-August-2020 at 1:04PM
They make Rotella 10W30 too.  In northern areas, that might be a better choice than 15W40.  The Rotella 10W30 is a bit thicker than a standard 10W30 if you look at the CST at 100 degrees C.  FWIW, I have run Rotella 10W30 for years on my flat tappet engines, and never had an issue.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 72 RS 351 Quote  Post ReplyReply Direct Link To This Post Posted: 28-August-2020 at 3:11PM
What choices are there for oil additives for old cam engines? I'd prefer using modern oils and an additive, I like Amsoil the most. They do make special oils for older engines, but I also like choices that don't require special ordering.

I just received an order in two days through the Amsoil site, a case of Severe gear oil. So it isn't really slow, but it isn't as convenient or fast like going to any local store etc.
Don
73 Ranchero GT 351C-4V 3.70 gears, to build a keeper
73 Ranchero Sport "72 front end", floor shift/console, planning EFI 351-3V &4R70W
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Big Bird Quote  Post ReplyReply Direct Link To This Post Posted: 29-August-2020 at 2:44AM
If I'm reading your post right, you bought the car 18 years ago and only put 5,000 miles on it, the 40+ year old car has only 37,000 miles total.
Cars that mostly sit tend to use more oil/have more blow-by than cars that get used regularly.
Rings don't seat well, seals tend to get dried out.
"What we do in full frontal view, is more honest than your cleaned-up mind."
Randy
1979 T-Bird
2005 F-150 STX RCSB 4.6, 3.55 LSD
How the Heck does a REGULAR CAB SHORTBED weigh over 5200 pounds?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote schufitz Quote  Post ReplyReply Direct Link To This Post Posted: 29-August-2020 at 4:31AM

Just put a mechanical gauge on my '69 351W.  ~60 at start up, ~25 at idle hot summer day, ~30 cooler nights, ~40-50 cruising.   Un-rebuilt, 62K miles, replaced PCV valve when I got it with 59K 5yrs ago, dry air cleaner, zero blue smoke.  Running Lucas Hot Rod Hi Zinc 10W-40 now after a couple seasons of regular Penzoil 10W-40

Kind of a tight fit with power steering.  Was able to keep dash light using a Scott Drake extender



Edited by schufitz - 29-August-2020 at 4:50AM
Dave
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