To start let's set what the oil pressures should be.
At idle : 10 psi minimum

At 3000 rpm : 50psi Minimum

My problem is

At idle the oil pressure is 60psi and on the head in VTEC the oil pressure is 25psi.

The pressure is high at the block and the pressure is low in the head VTEC oil passages.

Any ideas, I am going through the Acura service manual and going to check the Oil Jet and I guess the pump will be next. besides that I will take off th head and check the "head oil control orifice".

thank you

 

at 3k on my b16a i get 80-85 psi before the pressure relief valve opens, then it drops to 72-76 and climbs back to 80psi at higher rpm. What motor do you have? b16a b18c, or lsvtec?

 

sorry I should have specified the motor.
it is a B18C5 ITR
The values I posted were from the service manual and the 60 psi reading was from the block pressure, where the pressure sensor is next to the oil filter, the Head reading was done while driving from the opening next top the VTEC solenoid.

 

Sounds like the bypass valve in the oil pump isn't releasing as much pressure as it needs to be. I haven't seen that happen before though, they're usually foolproof.

 

sorry I should have specified the motor.
it is a B18C5 ITR
The values I posted were from the service manual and the 60 psi reading was from the block pressure, where the pressure sensor is next to the oil filter, the Head reading was done while driving from the opening next top the VTEC solenoid.