lq1 stock oil pressure?

[93GTP]

Does anyone know with certainty what the stock oil pressure is for the 3.4 dohc? On gmpartsdirect they sell an oil pressure spring for 60 degree v6's that puts the oil pressure at 70 psi. I am considering adding that to my list of parts for the rebuild on my spare 3.4

[Turbo231]

To fill you in, that would be the bypass spring, in the event that oil can no longer go through the filter, it will start to bypass the filter at a set pressure, which in this case is 70 PSI. This spring is only used when oil is very thick because it is cold or your filter is clogged, and really doesn't "regulate" oil pressure, it only stops the pressure from going over 70 psi.

 

Oil pressure will be all over the place depending on how tight the engine is built and how hot/thin the oil is going to be. To avoid your question, I'm too lazy to visit my factory service manual. But, you will need more then your dash gauge to read oil pressure, as it is only a switch with a Yes/No signal. Yes being "Yes, you now have 4 psi of oil." It is designed to show about 3/4 of a gauge's worth of oil pressure.

 

Of course, I speak of 93 model Grand Prix's.

[93GTP]

Are you sure that the spring doesn't regulate oil pressure? This is exactly what the description of the spring says on their site: "Oil pressure in V6/60º engines is regulated by a spring in the oil pump cover. This spring (color coded with a blue stripe) will produce approximately 70 psi oil pressure." And yes I do realize that pressure will vary depending on rpm, temp, viscosity, etc. But I figured the spring regulated what the max would be.

 

I do plan on running an aftermarket pressure gauge when I put this engine in as the stocker does only act as a switch, at least mine does. I have seen other grand prix's that do seem to monitor pressure more accurately though and actually flucuate depending on the conditions.