Flathead Normal Oil Pressure

[m606paz]

What should be the normal oil pressure on cmp V8 flathead engine? At idle? 2000 rpm? Cold? hot?
Cheking pressure on our F15A....

efa913f78e1a855a4236a9030a88b81d.jpg
https://uploads.tapatalk-cdn.com/201...030a88b81d.jpg

Thanks in advance!

[Dave Newcomb]

Ford has two types of oil pumps '49 up and then earlier. The '48 and earlier blocks have the oil pressure relief valve in the front of the valley and 20 psi running is considered good. The later pump has its relief valve intergral with the pump and can range from 80 psi cold to 20 psi hot. When installing a late pump in a '48 - block the valley relief spring must be shimmed or stretched so as not to operate before the pump relief. It is a popular upgrade in rebuilding V8s. There are even different electrical sending units for your guages ranges. Newc

[m606paz]

Thank you very much for your quick reply.
This F15A is late 1944/45.
The electric sending unit fail and will be install a mechanical unit to make an oil pressure check.

[Tony Smith]

Originally Posted by m606paz

Thank you very much for your quick reply.
This F15A is late 1944/45.
The electric sending unit fail and will be install a mechanical unit to make an oil pressure check.

Sorry to hi-jack your thread in other directions.

I understand from your earlier posts that there is currently some difficulties in Argentina with overseas payments, but it is possible to readily purchase brand new 80psi electrical senders of the type used with the CMP V8. Despite the funds transfer problem, would this not be easier than converting to a mechanical gauge?

https://www.ebay.com/itm/48-49-50-51...d462%7Ciid%3A1

[m606paz]

Hi Tony
Thanks for the Ebay link!
The electric gauge will remain in place on the dashboard. Seems to be original.
I will add a mechanical oil gauge to control the pressure.
The point is what are the proper pressures in ford V8 engines. This engine is SN 5G#####F
Now the engine have 80 PSI cold , and once warm it drops to 65 PSI with the mechanical oil gauge.
Here is winter. I don't know how the pressure will be in summer ...

[Tony Smith]

Originally Posted by Dave Newcomb

Ford has two types of oil pumps '49 up and then earlier. The '48 and earlier blocks have the oil pressure relief valve in the front of the valley and 20 psi running is considered good.

Then again, in the 48' and earlier style pumps (as fitted to CMP's), there are also 2 different pumps.

The earlier CMP oil pump could produce a maximum of 50psi cold, and around 15psi hot. The gauge sender on the block is specific to the gauge and is stamped with the number "50" on the thread. The dash gauge reads up to 50psi (and then there are 2 versions of this gauge, a brown gauge for Cab 11 nd 12, and grey gauge for Cab 13)

Then from around 1944, a new pump with a higher pressure relief was introduced that could produce 80psi max, as Dave has mentioned above. This pump had a sender marked with "80" and a gauge that reads up to 80psi (and again 2 types, a grey gauge for commercial style Cab 13 instrument clusters, and a 2 1/4" round gauge for the later military style cluster.

Brand new Ford Oil pumps are available as modern production items, but as far as I am aware, they are only made in the post-'49 style 80 psi version (which requires the modification mentioned by Dave to use in a wartime block). I have not seen any new production early-type pumps available. These new pumps are available in either a standard flow volume or a high volume design. (Melling M19 or M15). Either will work, but there is not any benefit in running a High volume M15 in a more or less standard engine.

Note too that it is perfectly fine to use an 80psi pump in an early engine, but you must use BOTH an 80 psi sender and an 80 psi gauge with it. You can use a 50psi pump with an 80 sender/gauge combination, but never the other way around. It is also sensible to change the Bakelite timing gear to an Aluminium type if running an 80 psi pump.

As only 80psi pumps are available as new parts, I would like to see "someone" produce a brown face decal marked 0-30-80 to go on a later 80psi gauge, so that an appropriate-looking brown gauge can be used in 11 and 12 cab fords in conjunction with an 80psi pump. Anyone?

01A-9273A.jpg Oil.jpg 41C-9273.jpg Late oil.jpg

[Jacques Reed]

Originally Posted by Tony Smith

I would like to see "someone" produce a brown face decal marked 0-30-80 to go on a later 80psi gauge, so that an appropriate-looking brown gauge can be used in 11 and 12 cab fords in conjunction with an 80psi pump. Anyone?

Hi Tony,

The artwork looks pretty simple and straight forward. I might have a go at it. Could be a good project during lockdown. I cannot print them however as I no longer have a colour printer. Got fed up replacing expensive cartridges even when I seldom used the printer. I have a laser printer and decal paper but only print in black.

Happy to put the artwork here for others, or liase with someone to get them made. I have the later 0-80 gauge to get the background size, shape, and border correct. Impossible to scan one without bending the needle but if you could get me a photo as square on to the middle of the gauge that would reduce distortion.

Cheers,

[m606paz]

The F15A instruments

http://www.surfacezero.com/g503/show...92424&cat=4108

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http://www.surfacezero.com/g503/data...828_092424.jpg

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http://www.surfacezero.com/g503/data...828_092439.jpg

[Jacques Reed]

Hi Tony,

Attached is the preliminary artwork for a Cab 11 and 12 Oil Pressure gauge face. It was a good project today. Too cold for the shed.

Will work on scaling for printing and tidy up a few things but it looks OK. Will repost it when that is done.

I found I could tilt the image digitally in Paint.net so I used yours as posted and made it level.

Cheers.

[Tony Smith]

Originally Posted by Tony Smith

I would like to see "someone" produce a brown face decal marked 0-30-80 to go on a later 80psi gauge,

Those are very good decals.

I have a couple of very nice NOS 50psi brown gauges, but I can't use them with the new manufacture 80psi pumps. Ford never made brown gauges with 0-30-80.

I need a brown decal calibrated 0-30-80 that I can stick onto a late 80 psi grey gauge to use with an 80psi pump.

[Tony Smith]

I don't have your graphic skills, but a complete brown decal with these numbers:

[Jacques Reed]

Originally Posted by Tony Smith

I don't have your graphic skills, but a complete brown decal with these numbers:

Hi Tony,

My misunderstanding.

So from what I now understand the 0-30-80 psi brown gauge face needs to be reproduced because they don't exist?

If I modify what I have done on my 0-50 psi face to coincide with a 0-30-80 psi face that would do the job? As long as the max needle deflection shows 80 psi.

It would be an easy mod. I used a NOS 0-30-80 psi face for my dimensions and registration so a bit of moving of numbers and a best estimate of the style of the "3" and "8" would do it. Also adjusting the scale if required for the 30 psi position.

I will see what I can do.

I know it is a bit subjective but how does my colour choices look compared to an original brown face gauge?

Cheers,