Oil Well Baffle on a C85 PA11

[Ken Kennedy]

I bought a Piper oil well baffle from Univair (pn 11491-00) to get our oil temps a little lower this summer but I am not sure how the darn thing fits.Does anyone have a picture they could post.This part is originally for a 90 hp Supercub.

[tempdoug]

Ken, sorry i cant help you out with a picture, but its something ive messed with quite a few hours. When you put that baffle on it drops the indicated temp on the gauge quite a bit. In the winter, i stick a foam ball back in the intake hole, to bring the temp back up. But basically if the oil temp bulb is cooler it has to be lowering the oil temp some. If its cooling all the oil like the gauge says after the baffle install, i dont know. Someone here was going to put a scott oil temp bulb in the bottom of the kidney tank and see what the temp difference actually was before and after the baffle install, but i never did see any more on it. I just ran a 1 1/2 inch hose originating from the left rear baffle over the housing, blowing over it and that really brang the indicated temp down. I think i could have got by with just 1 inch. One of the more experienced guys up here calls it the oil fooler instead of the oil cooler. On One i seen the hole was installed under the temp bulb nut with the gasket and another hole on the side where the hose hooks onto. doug

[cruiser]

http://www.nfauto.co.uk/oil_filter_cooler.htm I used one of these on my 0200 J3 with a 18-95 engine cowl, silicone grease between it and the filter for heat transfer. It made about 8-10 degrees difference. FWIW. Jim

[RanchPilot]

http://www.nfauto.co.uk/oil_filter_cooler.htm I used one of these on my 0200 J3 with a 18-95 engine cowl, silicone grease between it and the filter for heat transfer. It made about 8-10 degrees difference. FWIW. Jim

Brilliant! Like a beer cozy for your oil filter...

[tempdoug]

Ken, is there anyway you could post a picture of that piper baffle?

[supercub]

I don't know what you have........but go look at a Cessna 150. There's a pan that bolts to the bottom of the engine and directs air from the nose cowl back to the oil tank. On the PA-11 or PA18-90 it will run from the rectangular opening, just below the prop in the nose cowl, back to the oil tank. You'll have to build a small channel that connects the nose bowl opening to the C-150 baffle (channel) that I'm talking about.

[Ruffair]

Hey Ken,
If you didn't live in such a HOT darn place in the summer you wouldn't have that problem..!
Kem

[cruiser]

http://www.cessna120-140.org/forum/f...k_baff_247.pdf Here is a link on the C120-140 site about baffling a small Continental showing a poor description of the belly pan/oil tank baffle. Airforms does not have this pattern last time I checked. Be sure all of the inter-cylinders parts are tight and secure. Jim

[cruiser]

http://www.aircraftspruce.com/catalo...oilchiller.php Just a few airplane fun units. Jim

[tempdoug]

i dont think with the baffle he mentioned, he has a oil filter. -8 engine.

[T. Parsons]

Thanks Cruiser, excellent information on the baffling.

[cubdriver2]

I made my own belly baffle. Theory is that hot oil lays in bottom of case so cool case bottom with air and help pull heat from oil. Works on -8 or -12







On my -12 I use this on the oil filter, good for 8 to 10F off temp,


AA40T

http://www.aircraftspruce.com/catalo...estShrouds.php - 1.0kb



Glenn

[Steve Pierce]

I thought the idea was to funnel air down to the oil sump to help cool it and the oil in it.

The baffle Ken was asking about goes around the oil screen housing/oil temperature probe housing. We have always wondered if the oil temperature probe was fooled by air blowing on it using one of these baffles or did it actually cool the oil. Jerry Burr did some testing of this with some interesting results.
Grabbed Frame 1 (1).jpg Picture 004.jpg Picture 006.jpg


Oil Temperature Test. 26 Jan 2010

OAT. 37deg F. Alt. 1000’ MP. 23.5 MPH. 92.

A two inch scat tube was used between the outside ram air and the oil screen shroud. It was modified with an air shutoff for the tests.
The oil galley on the left rear of the engine where the oil cooler mounts was modified to accept a temperature probe.
Two cameras were used to monitor the screen oil temp and the galley oil temp.
These were fed to a common screen on tape and uploaded to computer to do the final comparison.
10 minute runs were used as the temps seemed to normalize at that point.

Time. ----------Galley temp ---------Screen temp --------Cold ram air
10 min ---------207 ----------------183 -----------------Off
10 min ---------207 ----------------152 -----------------On
10 min ---------207 ----------------180 -----------------Off
10 min ---------207 ----------------152 -----------------On

Land approach -202 ----------------150 -----------------On
Touchdown ----195 ----------------152 -----------------On
Park -----------193 ----------------162 -----------------On

Slow flight
1 notch flaps --200 -----------------180 ----------------On

Oil temp in the galley seems to be affected mainly by power setting and not much else. The cooling of the screen had no effect what so ever on the galley oil temp.

Jerry Burr

[cubdriver2]

" I thought the idea was to funnel air down to the oil sump to help cool it and the oil in it."


Steve the belly baffle directs the cooler air from the front and keeps it close to the bottom case and then blows into the front of the sump, I,m just trying to keep the air in contact for as long as possible. I had the screen housing shroud on my Pa11 and this works better.





And this on the oil filter, but PN# 10-02797



Glenn

[Ken Kennedy]

I did buy the Piper oil screen baffle (Shroud) to lower my oil temps slightly, but after reading Jerry Burr's test data that Steve Pierce supplied, it looks like the baffle is more of an oil fooler than an oil cooler like I thought it might be. Lots of other great ideas however, showed up on this thread. Ken