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I have a BP 383 in my 76 and ever since install ,my oil pressure gauge pegs at 80 cold then drops to 60ish when warm.My guess is the sender on the block is wrong one or? What say you? Thanks
Funny that, there's another thread running right now on the same topic.
Bottom line, if you find a quality sending unit that not only reads out correctly, but lasts more than a month or 2. Please let us all know.
I have a BP 383 in my 76 and ever since install ,my oil pressure gauge pegs at 80 cold then drops to 60ish when warm.My guess is the sender on the block is wrong one or? What say you? Thanks
Here is how I test the sending units. Connect to a air compress and set to 10,20,30,40,50,60,70,80 PSI and measure the ohm's resistance of the sensor. A gauge when working properly works in the range of 0 - 90 ohm's input.
Recording what the sending unit output at 40 PSI (Easy marker on the gauge) let's say it's 40 ohms. Then connect a 40ohm resistor from the connector to ground and see what your gauge reads.
Or can leave the connector in place and ground the sending unit to the engine block, and use your air compressor set to the easy gauge markers, and see what the gauge reads.
Doing this, I have found most sending units DONT MATCH what the gauge wants. So when set to 40 PSI and read the gauge I learn what the gauge reads and call this 40 PSI.
Here is how I test the sending units. Connect to a air compress and set to 10,20,30,40,50,60,70,80 PSI and measure the ohm's resistance of the sensor. A gauge when working properly works in the range of 0 - 90 ohm's input.
Recording what the sending unit output at 40 PSI (Easy marker on the gauge) let's say it's 40 ohms. Then connect a 40ohm resistor from the connector to ground and see what your gauge reads.
Or can leave the connector in place and ground the sending unit to the engine block, and use your air compressor set to the easy gauge markers, and see what the gauge reads.
Doing this, I have found most sending units DONT MATCH what the gauge wants. So when set to 40 PSI and read the gauge I learn what the gauge reads and call this 40 PSI.
I did the same thing and found that all three of my senders read zero ohms independent of air pressure.
An LS swap (with a piezo sensor) fixes this problem, too!
I have a BP 383 in my 76 and ever since install ,my oil pressure gauge pegs at 80 cold then drops to 60ish when warm.My guess is the sender on the block is wrong one or? What say you? Thanks
You're good 😊 I have a Blueprint 350 and it too reads 80 when cold and 60 when hot also.
I have a BP 383 in my 76 and ever since install ,my oil pressure gauge pegs at 80 cold then drops to 60ish when warm.My guess is the sender on the block is wrong one or? What say you? Thanks
Quite likely your BPE sbc has a Hi-Volume and/or Hi-Pressure Oil Pump; either or both'll certainly do that. Even though probably unnecessary.
Oil pressure gauge
