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Posted By Discussion Topic: oil pressure -- page: 1 2     kubes40 09-15-2010 @ 5:53 AM reply profile send p.m. Senior Posts: 3395 Joined: Oct 2009 If you didn't dampen the relief valve in the block, the pressure will only reach as high as THAT valve will allow. That is, much lower than your pump is designed to deliver. The valve built into your pump will never come into operation. Thus, you will not utilize the extra pressure that pump is capable of. I've seen many guys overlook the fact they need to dampen the internal block valve when installing a high volume pump. As far as the dash gauge reading correctly in this particular situation, I'd see no reason why it wouldn't. Simply put - both the sending unit and the dash gauge have no clue your engine has a high volume pump. 37RAGTOPMAN 09-15-2010 @ 4:59 AM reply profile send p.m. Senior Posts: 1958 Joined: Oct 2009 TOMO this is what you said, If you use a 50# sender with an 80# pump and pressure relief valve, you will be reading at the top of the scale when you have more than 50# of pressure. I suspect that this would eventually harm both the sending unit and the gauge this is what you explained, and I Was wondering this is what I have done, but left the oil pressure relief valve in the block, you would think this valve would regulate the pressure the second time, I can tell you for a fact, the gauge does not peg to the top and have been driving my 37 for about 8-10 years set up this way with no problems, and reads normal pressure, reads about 30 lbs on the highway 37RAGTOPMAN and KEEP on FORDIN,,, kubes40 09-14-2010 @ 6:09 PM reply profile send p.m. Senior Posts: 3395 Joined: Oct 2009 Tom, What you describe is what I was taught and have been doing for years. Only makes sense. supereal 09-14-2010 @ 8:33 AM reply profile send p.m. Senior Posts: 6819 Joined: Oct 2009 As the later style pump has a relief valve built in, the one in the valve chamber can be eliminated. The gauge can be brought into range by inserting a series resistor in the gauge circuit, but the reading will not be linear. Senders that will work with the original pump can be seen on page 90 of the C&G catalog. TomO 09-14-2010 @ 8:31 AM reply profile send p.m. Senior Posts: 7250 Joined: Oct 2009 Mike, the sending unit has to be the same as the pump and pressure relief valve. If you have an 80# pump and the pressure relief valve is also 80# you need a 80# sending unit. The gauge workings are the same for a 50# gauge or a 80# gauge. If you use a 80# sending unit with a 1940 (50#) gauge the actual oil pressure will be approximately twice the reading. You can test this by hooking up a sending unit and gauge to your air compressor and regulating the pressure with the air pressure regulator. Start out at 10# and then go up to a max of 80#. If you use a 50# sender with an 80# pump and pressure relief valve, you will be reading at the top of the scale when you have more than 50# of pressure. I suspect that this would eventually harm both the sending unit and the gauge. Most of the sending units and gauges that I have checked, came within 5# of the air pressure reading. The ones that were off were units that had been repaired and not re-calibrated. Tom kubes40 09-14-2010 @ 6:52 AM reply profile send p.m. Senior Posts: 3395 Joined: Oct 2009 Hey Alan, I should have said something about the early 50# senders not being marked whatsoever. As you and I know, Ford started marking all of them when the 80# senders were produced. When I install hi-volume pumps in my rebuilds, I always block of the internal (block) pressure relief valve. The pump will only reach the pressure the relief valve allows. Thus, if the hi-volume pump has a 50# relief valve and the internal block relief is still allowed to open at 20#, well, 20# is what you get - maximum. Also, the dash gauge will look like it's buried if the sending unit doesn't match the pump and / or the dash gauge. While I realize the dash gauges are only an 'estimate' of reality, with a mix-match of units, what it shows is not even close. supereal 09-13-2010 @ 11:04 AM reply profile send p.m. Senior Posts: 6819 Joined: Oct 2009 You guys make it easy on me. As said, the 80# sender will work with the 50# pump if the relief valve is OK. The 50# sender is no longer produced, unless you can find a NOS unit, or have yours repaired. As with most Ford gauges, the reading is only relative, not precise. If you are very concerned about the actual pressure, install an aftermarket direct reading gauge. Same is true with the other gauges, such as temperature and charging current. If you are the obsessive type, the old car hobby will drive you nuts, anyway. Just drive and enjoy the ride. 37RAGTOPMAN 09-13-2010 @ 6:10 AM reply profile send p.m. Senior Posts: 1958 Joined: Oct 2009 46fordnut On my 37 ,the way I see it, the sender and gauge are matched,so it will read the correct pressure.that the pump is putting out, yes the press regulater. is were the pressure is regulated, but I have more volume, atleast the option of more oil,if the regulater calls for it, better then starving for oil, with a worn 50 lb pump, if it only puts out 50lb and then gets worn , how much pressure or oil volume would be expected ? my oil pressure increased with the 80lb pump, the way I look at it. FORD did this up grade for a reason, and everybody rebuilding a V8 FLATHEAD should go for it, my 3 cents worth 37RAGTOPMAN and KEEP on FORDIN,,,, This message was edited by 37RAGTOPMAN on 9-13-10 @ 6:23 AM ford38v8 09-12-2010 @ 8:50 PM reply profile send p.m. Senior Posts: 2758 Joined: Oct 2009 Mike, I think I can answer this question, as they tend to bed down early in Ioway. The pump used in a flathead will still be subject to a pressure relief valve, whether on the pump or in the front of the block. Also, regardless of the pressure or volume produced, only the pairing of sender and gage would be the important issue to attain an accurate reading. Many guys do not know of the point you made regarding the value mark on the sender. I'd suggest that they reread your post to fully understand that senders having no mark at all are all 50 lb senders. We'll see in the morning if I got it right, as I also depend on Bob's expertise. Alan 46fordnut 09-12-2010 @ 8:41 PM reply profile send p.m. Member Posts: 332 Joined: Oct 2009 im not sure but someone here used a #80 pump with a #50 sender . they said they have great psi this was on a 1937

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