RV-8 oil cooler recommendations

[Onewinglo]

Originally Posted by elev666

JP , would you happen to remember were you sourced the butterfly valve you used , I’m using a FW mounted 13 row and there will be days I need to close off cooling air flow here , yours looks nice and light and will save me reinventing one here !

Aircraft Spruce 3". The flange on the baffle came from Spruce also.
https://www.aircraftspruce.com/catal...?clickkey=7368

A better view.
https://photos.app.goo.gl/d9FPhN24KVj4NZgz6

[scsmith]

Originally Posted by elev666

JP , would you happen to remember were you sourced the butterfly valve you used , I?m using a FW mounted 13 row and there will be days I need to close off cooling air flow here , yours looks nice and light and will save me reinventing one here !

I made my own 3.5" butterfly valve that mounted to the rear baffle and then attached a 3.5" scat tube to run to the cooler. I am now in the process of increasing to 4" scat and a 4" butterfly valve -- I think the 3.5" is a little too small for the large oil cooler for the angle valve engine.

[DanH]

Originally Posted by Danny King

I am currently using the 10599 on my I0360A1B6 and cruise around 200F-205F. I know that is within limits, but would love to cruise closer to 190F. Would swapping my 10599 for a 10611 accomplish that?

Probably, depending on upper and lower cowl pressure. I can tell you how to measure it if you wish to have assurance before doing the swap.

I have some cowl pressures for RV-8's. I'll look at the numbers. Remind me if I forget.

Will the 10611 mount in the foot print of the 10599? My 10599 is mounted behind #4 on the aft baffle.

No, it is physically larger, and will probably need to be remote mounted.

[FlyGood]

For Dan: For your converging oil cooler exit duct, what is the ratio of the duct exit area at the bottom of the cowl to the area at the exit of the cooler?

[DanH]

Originally Posted by FlyGood

For Dan: For your converging oil cooler exit duct, what is the ratio of the duct exit area at the bottom of the cowl to the area at the exit of the cooler?

It does not extend all the way to the freestream, but rather to the top of a converging exit bell exhausting all the cowl air. Oil cooler mass flow meets the majority mass flow at a right angle, more or less, so I didn't want significant velocity. So, if the duct exit is smaller than the cooler face area, it is not by much. The area was set by the available space between engine mount tubes. I do not know the exact area.

[FlyGood]

Thanks, Dan. This will be another fun aspect of the build!

[RV Jerry]

Another consideration for oil cooler size is type ,drawn cup vs bar and plate, the bar and plate will typically be more efficient for heat dissipation due to fin design and area. I think before deciding on size alone the type of cooler should be considered.

[Rallylancer122]

I just redid the oil cooler install in my Dad's RV8. IO390, Sam James cowl, and it had an 11 row Niagra on the left side that just wasn't cutting it. I was regularly seeing temps in the 210-220 range, and that was babying the engine.

So I bought an airflow-systems 13 row cooler and installed it on the right side. Basically I copied the showplanes installation. I would have just bought theirs but I have non-standard baffling so I built my own. In hindsight I probably should have just bought the showplanes kit and modified it. I looked at some more exotic coolers, but the 2006x appears to be a form/fit replacement for a 13 row Harrison which is pretty common. So if I'm ever somewhere and it fails odds are I can get a replacement quickly to get me home.

So far I'm quite happy with the results. Temps are consistently in the 180's, however our ambients in Wisconsin are cool right now so we'll see how it handles summer.

DEM

[chaskuss]

Originally Posted by RV Jerry

Another consideration for oil cooler size is type ,drawn cup vs bar and plate, the bar and plate will typically be more efficient for heat dissipation due to fin design and area. I think before deciding on size alone the type of cooler should be considered.

Jerry could you please provide links to examples of each of the two styles of oil cooler you have spoken about? Would I surmise correctly to think that the old Harrison is an example of one style and that is Stewart Warner would be an example of the other?

Charlie

[RV Jerry]

You ca tell by looking at cooler the bar and plate has what looks like a tank at ends of cooler a drawn cup looks like the individual row of fins extend all the way to end of cooler.
Hope this helps