Re: What are the possible reasons for slow oil pressure on start up

Posted by JWL On 2012/12/11 10:40:20

Bill,

You have oil pressure readings that many of us with the 356 engine envy. I can get an oil pressure reading on an auxiliary gauge by just cranking the engine without starting it. My stock gauge reads slower and lower than the auxiliary gauge.

Suggest you temporarily connect a direct reading (mechanical) oil pressure gauge, to compare with the one in the instrument panel. This can be easily done by connecting into one of the main bearing oil gallery port sites on the lower RH side of the engine, or with a tee fitting at the same site as the stock sending unit. The main bearing port sites are tapped for 1/8" NPT plugs. My auxiliary gauge is connected to the port site for the rear main bearing.

A noticeable difference between the two gauges would invite checking the sending unit or gauge unit, or permanently connecting an auxiliary gauge for an accurate reading.

(o{}o)