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.

[Superhawk996]

Food for thought

If you look at histograms of average vehicle speed, engine speed, and vehicle acceleration you will find that the amount of time an engine spends at 5000 rpm is trivial. It is out beyond 3 standard deviations.

Full on racing is different. Occasional autocross and track events would only skew that distribution minimally. The reality is engines don’t operate at 5000 rpm much at all despite what we think as enthusiasts.

Likewise at 5000 rpm the engine fan is providing the bulk of cooling. Not the oil cooler.

The worst case for cooling is when engine speed (ie fan speed) is low and load is high. This is usually in town at idle or when repeatedly accelerating away from traffic lights. On the highway, where aerodynamic loading becomes significant, you’ll find that your engine speeds are more like 3000-3500 rpm.

So ask yourself why would you be concerned if the external oil cooler had some minor bypass at 5000 rpm?

[Mr Beckstar]

Food for thought

If you look at histograms of average vehicle speed, engine speed, and vehicle acceleration you will find that the amount of time an engine spends at 5000 rpm is trivial. It is out beyond 3 standard deviations.

Full on racing is different. Occasional autocross and track events would only skew that distribution minimally. The reality is engines don’t operate at 5000 rpm much at all despite what we think as enthusiasts.

Likewise at 5000 rpm the engine fan is providing the bulk of cooling. Not the oil cooler.

The worst case for cooling is when engine speed (ie fan speed) is low and load is high. This is usually in town at idle or when repeatedly accelerating away from traffic lights. On the highway, where aerodynamic loading becomes significant, you’ll find that your engine speeds are more like 3000-3500 rpm.

So ask yourself why would you be concerned if the external oil cooler had some minor bypass at 5000 rpm?

Yes all very pertinent considerations.

However, for my rig the oil temp gets hottest when cruising on the highway and I’m not changing the fan so that pretty much leaves an oil cooler as the alternative.

At 68 MPH, the engine’s doing 4,200 rpm. Being an auto, it drops into second gear on significant inclines and then it’s up to the driver whether to sit on e.g. about 5000 rpm at 55 MPH or something less. There are plenty of long hills like that over here and whilst I agree it’s going to represent a small percentage of driving time, it’s in my opinion the most important time for the cooler to be doing its job at best possible efficiency. The last thing I want at that time is for the cooler to be bypassed. And yes, I probably wouldn’t be too concerned about the bypass slightly cracking at 6 PSI at 5,000 rpm (I rarely push it that hard), but if it’s 8 PSI at 4,000 or 9 PSI AT 4,500 then that is something I’d like to fix! The calculation said I’ve already got 7 PSI without considering fittings so I think it’s heading that way.

[Superhawk996]

At 68 MPH, the engine’s doing 4,200 rpm. Being an auto, it drops into second gear on significant inclines and then it’s up to the driver whether to sit on e.g. about 5000 rpm at 55 MPH or something less.

Wow! There’s so much going on in that one statement.

The only thing I can do is cheer you on with the data acquisition and testing! (IMG:style_emoticons/default/cheer.gif)

I’m truly impressed at what you’ve measured thus far. Will be curious to see what you come up with measuring the pressure drop across the operating system.