Bypass Valve on Stock Oil Filter Console, Looking for relief pressure of bypass valve to help with design of remote oil filter and cooler Options

[Mr Beckstar]

Hi all.

I have a 4 cylinder 2 litre and am adding a remote oil filter and oil cooler circuit via a spin on adaptor attached to the stock oil filter console mount. But I noticed the oil filter bypass valve in the stock oil filter mount (circled in photo below) and now I’m concerned that, at high rpm, I’ll be bypassing the remote cooler/filter circuit. Does anyone know the bypass valve relief pressure setting? Knowing that would at least allow me to judge whether it’s an issue.

[Mr Beckstar]

Thanks for the great responses everyone (IMG:style_emoticons/default/biggrin.gif)

If it’s truly only 3 PSI then I think it’s worth doing some modifications, as I think it will bypass at high rpm, right when the remote cooler is most needed. The stock bypass valve could be set at 3 PSI without concern, because it wasn’t bypassing the oil cooler when it bypassed. But now it does and that could be a problem.

My remote filter will be a Mann 940/81 which has a built in bypass valve set for 0.8 Bar (11.6 PSI). Most are higher than this. It makes me wonder about the stock bypass which is apparently about 3PSI.

I wonder if I set the stock filter bypass to say 10 or 15 PSI whether it would cause any issues for the pump. I normally see no more than 60 PSI on a cold start. Are they okay for say 80 PSI whilst warming up?

Anyway, to put some engineering into this mod, I’m considering measuring the pressure at the upstream side of the stock filter console, carefully getting the engine up to about 185 deg F whilst watching the pressure gauge and then carefully running up to redline whilst watching the gauge so I can see what sort of back pressure would be normal in the remote filter/cooler circuit. I’ve already got a pressure gauge mounted at the stock pressure switch location so I could just subtract that reading from the new gauge reading to get the remote circuit backpressure. That way I could choose a relief pressure for the stock bypass valve that bypasses only at pressures developed above redline AND at oil temperatures below 185 deg F. Then I’d be convinced the remote cooler would be doing its job when it’s needed.