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EFV-8 Club Forum / General Ford Discussion / Oil pressure sensor

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Posted By Discussion Topic: Oil pressure sensor -- page: 1 2     mzahorik 07-01-2021 @ 1:52 PM reply profile send p.m. Member Posts: 209 Joined: Nov 2009 Well..... I got the dash gauge to read 20# when there is 40# of air on the 80# sensor. AND the the dash gauge reads 40# when there is 80# of air on the sensor. Just have to remember that I need a times 2 on this gauge. Mike mzahorik 07-01-2021 @ 12:47 PM reply profile send p.m. Member Posts: 209 Joined: Nov 2009 Sure, but it the oil ever gets over 50#, the dash gauge will effectively be grounded. This will cause the heater in the gauge to be on all the time. I found in my Service Bulletins that a ground like this can damage the gauge. What I am attempting to do is to use the 80# senor, to protect the dash gauge, and adjust the dash gauge to read 20# when there is 40# on the engine and dash read 40# when there is 80# on the engine. Mike cub 45 07-01-2021 @ 12:29 PM reply profile send p.m. Member Posts: 46 Joined: May 2021 Could you tee off the oil sensor and put in a mech gauge that you know reads correctly and adjust your dash gauge to match ? mzahorik 07-01-2021 @ 11:31 AM reply profile send p.m. Member Posts: 209 Joined: Nov 2009 Well..... I did a little research and testing of the 50# and 80# sensor with my 1937 dash gauge. I found that when applying 80# of air pressure on the 50# sensor, the sensor contact is closed, effectively shorting the dash gauge to ground. I'm a little concerned about the dash gauge. Thinking that maybe the heater in it may burn out if it is on all the time or most of the time. I found that the 80# sensor with 80# of air pressure on it has a duty cycle of just over 50%. That is, the contact is closed 1/2 the time and open 1/2 the time. This allows the dash gauge to cool more. Next I want to see how much adjustment there is on the dash gauge needle. To see if I can adjust it to read 50# when there is 80# of air on the 80# sensor. Mike mzahorik 06-29-2021 @ 7:39 AM reply profile send p.m. Member Posts: 209 Joined: Nov 2009 I understand that it is inaccurate, but I do know what it is. If the gauge reads 40#, I actually have 60#. It would be nice to have a more accurate gauge reading, but I'm not sure how. My dash gauge has marking of 0, 10, 20, 30, 40 and 50. The 30 thru 50 marks are close together, so accuracy is low to begin with. I thought of setting the dash gauge so that when the dash gauge reads 20#, there is 40# on the engine. The rest falls where it may. Mike mzahorik 06-29-2021 @ 7:29 AM reply profile send p.m. Member Posts: 209 Joined: Nov 2009 The engine is a 1946 59 series engine. It's a bitsa engine. Hardly anything is 1937. Mike TomO 06-29-2021 @ 5:13 AM reply profile send p.m. Senior Posts: 7256 Joined: Oct 2009 Mike, because you have adjusted your dash unit to read lower with a 50# unit, your 80# unit will be very inaccurate. I like to keep the dash unit as sent from King Seeley and then use the 80# unit as is also. This gives the readings that I posted previously. 50# units are harder to find than 80# units. Remember that you really don't care what the real oil pressure is, just that it is in the normal range for your engine and does not drop when you accelerate. As Carcrazy pointed out, more oil pressure is not always a good thing. You just need enough pressure to keep the engine lubricated. Tom carcrazy 06-28-2021 @ 9:57 AM reply profile send p.m. Senior Posts: 1668 Joined: Oct 2009 What crankshaft rear seal method will be used on your '37 bitsa engine? If you are using the system used on the 1941 and later Flatheads you will probably be OK. If you are using the earlier "labyrinth" system, beware as the increased pressure and volume of the oil will overpower the capability of the sealing system and the engine will have a massive continuous oil leak past the rear main bearing. mzahorik 06-28-2021 @ 8:23 AM reply profile send p.m. Member Posts: 209 Joined: Nov 2009 Tom, I have an appointment and will not respond until after 6 tonight. Thanks Mike mzahorik 06-28-2021 @ 8:15 AM reply profile send p.m. Member Posts: 209 Joined: Nov 2009 Tom, thanks for the reply. My original 50# sensor seems to work ok. In fact I re cal'ed the gauge to read 50# ar 80# air pressurre. My dash gauge reads 0 to 50# Air Pressure 50# sensor&dashGauge 80# 50# 70# 45# 60# 40# 50# 35# 40# 28# 30# 21# 20# 15# I didn't try this with the 80#Sensor. Thanks Mike

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