Summer temperatures and cooling

[Bryan Cotton]

I believe the oil that has passed through the cooler gets directed into the oil galleys and not directed to the sump.

Also, now when I read your posts, I hear Mel Blanc's voice. .

My research had indicated otherwise but could be wrong. So does all the flow go through the cooler once the pressure drops?

Edit: you are right, it rejoins the galley before the pressure regulator.
https://www.thesamba.com/vw/forum/viewt ... p?t=280293

[Bryan Cotton]

Improvement. 214-215 stable at 87 ambient vs 219 and climbing at 65 ambient last flight. Still not good enough. I'm going to try the hail mary of adding the second outlet and also trimming another loop off my original spring. It's been about 10 psi per loop.

[Bryan Cotton]

Today with my second oil cooler exit I saw 205-208 in cruise. Was able to do 5 laps around the pattern after cruising for a half hour. Oil would get to 214 on the ground and cool to 209 on takeoff. Seems a lot better. Oil pressure is still at 60, not sure why it didn't go down when I trimmed the original spring some more.

[XenosN42]

Today with my second oil cooler exit I saw 205-208 in cruise. Was able to do 5 laps around the pattern after cruising for a half hour. Oil would get to 214 on the ground and cool to 209 on takeoff. Seems a lot better. Oil pressure is still at 60, not sure why it didn't go down when I trimmed the original spring some more.

What make & model of oil temperature probe do you use?
Where is that temperature probe installed?
What is the make & model of the cockpit side oil temperature display unit?

Something just isn't right here.

[Bryan Cotton]

What make & model of oil temperature probe do you use?
Where is that temperature probe installed?
What is the make & model of the cockpit side oil temperature display unit?

Something just isn't right here.

The probe is an RTD I bought off eBay. I made my own setup with a hollow bolt and the RTD potted inside it. The instrument is a Brauniger Alpha MFD. I have not done a full calibration, but it reads ambient accurately between 40 and 90 degrees F.

[13brv3]

It would be easy enough to test it at boiling temp, which is just the temp range you need. I'm curious, what temp are you trying to maintain?

[Bryan Cotton]

It would be easy enough to test it at boiling temp, which is just the temp range you need. I'm curious, what temp are you trying to maintain?

Rusty,
I'd be happy if I was under 200F.

[13brv3]

Why 200? I've always read that you want oil temp over 212F to make sure you boil off all the water that's collected. Does the VW engine engine need to keep the temp lower for some reason?

[Bryan Cotton]

Why 200? I've always read that you want oil temp over 212F to make sure you boil off all the water that's collected. Does the VW engine engine need to keep the temp lower for some reason?

It gets brutally hot under the cowl - and the fuel gets vapor bubbles on the ground. The aeroinjector has no bowl so that gives us the infamous burps. So I'd rather be a little cooler.

I stretched my oil cooler bypass spring from 3 1/16" to 3 7/8", and peaked at 200F. I'm happy.

[pfhoeycfi]

Why 200? I've always read that you want oil temp over 212F to make sure you boil off all the water that's collected. Does the VW engine engine need to keep the temp lower for some reason?

It gets brutally hot under the cowl - and the fuel gets vapor bubbles on the ground. The aeroinjector has no bowl so that gives us the infamous burps. So I'd rather be a little cooler.

I stretched my oil cooler bypass spring from 3 1/16" to 3 7/8", and peaked at 200F. I'm happy.

In the final analysis what do you attribute your improvements to? Are the oem springs worth trying? Did you have to modify them? Curious can you replace the springs without draining the oil? I've had the oil drained each time I've pulled the springs and plungers.
Peter