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oil pressure gauge
#11
(05-17-2020, 08:26 PM)jpaz Wrote:
(05-17-2020, 06:49 PM)Stanglover Wrote:
(05-17-2020, 06:03 PM)jpaz Wrote: I have a recently rebuilt 351 4V  Cleveland engine with a Melling standard volume oil pump too. I did have an aftermarket electric oil gauge with matching sender and was getting some weird oil pressure readings. I guess the sender went or is going bad? Anyway I just add a mechanical gauge and it isn’t doing any of the weird readings anymore. But, it does read about 80 psi @ cold idle, then as low as 30 psi @ hot idle. I’m around 45-50 cruising around town. I do feel more reassured having the mechanical gauge and as long as you have at least 10 psi per 1000 rpms then you’re good to go.
 John, I'm curious. This might also be helpful to Frank as well. We both have the same Melling oil pump and I don't think our motors are so much different. What I see on mine is about 75 hot at idle and only drops to 60 running. I have never seen it drop anywhere near 30 or even 45 psi.
So why the difference? Your new mechanical gauge is a Bosch I believe, so even though the face is different, the parts inside ought to be at least similar. I would think that the readings on the two gauges would be close to each other unless there are factors I'm not realizing.

I don’t know why the difference, but that’s what it says. I do have a Bosch mechanical gauge. You have 75 hot idle and 60 cruising? That doesn’t sound right, you must mean the the other way around.
Sorry Vicus, not try to hijack your thread.
 Yes, apologies to Frank, but the numbers could be useful to him for when he gets his mechanical oil gauge. 
I took a screen shot off my video. It's not too clear, but shows around 75 at (almost) hot idle. I didn't get a shot of the gauge when wifey was driving, but I know it was at 60 psi. When I installed the gauges, I somehow managed to get the Temp and Oil switched around, which makes the oil gauge a bit harder to see. It is what it is now though. However, now I'm getting curious so I may get another gauge and double check my numbers.

[Image: MVI-1431-Moment.jpg]
Running at 2700rpm, needle is between 50 &75, so around 60 looking straight on at it.

Geoff.
 I learn something new every day!
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#12
The stock electric gauge on my 351C-4V always runs 90% of scale
and will sometimes drop to 80% but never lower.
I use 10W/30 Valvoline VR-1 racing oil with a K&N filter.
The type of oil and filter being used could affect oil pressure readings.

mike

[Image: 1_11_11_13_11_50_27.png]
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#13
(05-18-2020, 09:28 PM)goodnigh Wrote: The stock electric gauge on my 351C-4V always runs 90% of scale
and will sometimes drop to 80% but never lower.
I use 10W/30 Valvoline VR-1 racing oil with a K&N filter.
The type of oil and filter being used could affect oil pressure readings.

mike
Good point on the filter choice. I think 80% of scale would be about equal to the 60 psi I see that never drops below.
I use Castrol 10W/30 with (usually) a Motorcraft FL1A filter. I use this more for looks, but Purolator make good filters and meet Ford specs, so as I only drive 1500 miles a year, I'm not worried about it. However it is due for an oil change, so I'll try another brand and see if there is any difference. 
If there is, I'll repost.

Geoff.
 I learn something new every day!
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#14
(05-19-2020, 08:33 AM)Stanglover Wrote:
(05-18-2020, 09:28 PM)goodnigh Wrote: The stock electric gauge on my 351C-4V always runs 90% of scale
and will sometimes drop to 80% but never lower.
I use 10W/30 Valvoline VR-1 racing oil with a K&N filter.
The type of oil and filter being used could affect oil pressure readings.

mike
Good point on the filter choice. I think 80% of scale would be about equal to the 60 psi I see that never drops below.
I use Castrol 10W/30 with (usually) a Motorcraft FL1A filter. I use this more for looks, but Purolator make good filters and meet Ford specs, so as I only drive 1500 miles a year, I'm not worried about it. However it is due for an oil change, so I'll try another brand and see if there is any difference. 
If there is, I'll repost.

I’m using Joe Gibbs 10w/30 and a wix filter.

run_horse Run Horse Run!
John 72 Q Code
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#15
Folks

The oil pressure was never gone, the sensor wasn't able to read the right pressure rates. 

I found the culprit. 

[Image: 20200522-182435.jpg]

This little piece of motor silicone has worked its way into the hole in the sensor.

Now the gauge shows again high pressure within the limits. Nevertheless the already ordered mechanical oil pressure sensor and gauge will find its way into my car during summer.

Cheers Frank
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#16
"WEW" I bet your relieved...... HUH.
Best to have 2 gauges reading at the same time. I had this happen once to my Mechanical oil gauge. Got stuff in the gauge. Looked more like Oil sludge. Glad you figured this out!

Rod and Sally
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#17
Ya that’s a big relief. Thanks for showing us what happened and glad that’s all it was!

run_horse Run Horse Run!
John 72 Q Code
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#18
The OEM pressure gauges are also very slow to react. When I start my engine it takes a while for it go up. I dont think the actual pressure would take that long.

Sent from my SAMSUNG-SM-G930A using Tapatalk

[Image: 20160929_171923_edit2_small.jpg]

1971 M-Code Mach 1 w/Ram Air, 408 stroker, 285/291 0.558" roller cam, Blue Thunder intake, TKO600, Hooker headers with electric cut-offs, FiTech EFI w/ RobBMC PowerSurge pump
Strange center section with Truetrac, 3.5 gear and 31 spline axles, 4-wheel disc brakes
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#19
Might want to look to another brand of oil filter, the one you're using is bypassing and allowed that to get into the main oil galley.


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#20
(05-23-2020, 08:07 AM)Hemikiller Wrote: Might want to look to another brand of oil filter, the one you're using is bypassing and allowed that to get into the main oil galley.

The complete engine was disassembled into its individual parts and was rebuilt. It now had about 200 miles since the rebuild and I renewed the oil and also replaced the oil filter yesterday. I have checked whether there is debris in the oil, nothing found. I also opened the oil filter. I did not find any chips, dust, abrasion, sealing compound or similar. I only use the FL-1A oil filters from Motorcraft.

Looks like this fragment was hiding elsewhere in the block.

Cheers Frank
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