Another oil cooler question

[alpinelakespilot2000]

Originally Posted by bret

Also, with the Classic Aero oil coolers, is there a major difference in the standard cooler and the HE cooler, the price is twice for the HE?

Bret-
You might call Pacific Oil Coolers. They have a good reputation on this forum for helping solve problems and have a version of a HE that they could comment on I'm sure.

I'm about to explore a similar issue and that's my next step.

[PerfTech]

Originally Posted by bret

Also, with the Classic Aero oil coolers, is there a major difference in the standard cooler and the HE cooler, the price is twice for the HE?

.
....Yes! The HE unit gets rid on considerably more heat. Call pacific, ask for Wayne, and tell him to give you the part number for the HE double pass cooler Anti-Splat-Aero tested and found to be the best of all of them on out RVs. Thanks, Allan..

[Tbone]

There is a huge difference between the 7 and the 7A mount as far as oil cooler fitment is concerned. What may fit well on the 7A could be a pain on the 7 because of the additional brace midway. I have a brand new SW8432R cooler that will NOT fit the 7 area without major fab work. It may work on the 7A but not very well on a 7.

[DanH]

Be aware the double pass coolers, although about 10% more efficient, exhibit considerably greater oil flow restriction, which translates into more pressure against the vernatherm tip. Until the vernatherm is fully seated, some oil is bypassing the cooler.

Look at the SW "Oil Side Pressure Drop" chart for an 8432. Lycoming 4 cyl oil flow is about 7 gallons per minute, or 56 lbs, which makes the deltaP at the vernatherm more than 15 psi. A single pass cooler of the same dimensions (10599R) is about 5 psi. Same mass airflow rate.

For an angle valve, given its head finning, I'd pick a much larger single pass, in order to bias mass airflow to the cooler.

[pecanflyboy]

I'm considering the replacement of my SW 8406 (6-row/Single pass) with the SW 8432 (8-row/Dual pass). The SW 8432 is 1" wider, with the other dimensions the same, and both fittings are on one end.

I have an RV6 with a IO-360, James cowl, oil cooler mounted behind #4 on the baffle.

Has anyone had a good or bad experience with this replacement?

By the way, I spoke with Wayne this morning at Pacific, explaining my situation. He recommended the Aero Classics 8001689 which is the same at the SW 8432 (8-row/dual pass). The 8-row/single pass version is the Aero Classics 8001599 or SW 10599. He recommends the dual pass as it has slight better efficiency, same size.

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[rjcthree]

Are you trying to solve a known issue? With baffling being almost free to fix, have you looked at improvements there first?

[pecanflyboy]

Originally Posted by rjcthree

Are you trying to solve a known issue? With baffling being almost free to fix, have you looked at improvements there first?

I have been way down the rabbit hole to reduce CHT's and oil temperature. I've had good results as a result of the advice in these forums, but I want about 15 degrees of oil temperature, CHT's are good.

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[rapid_ascent]

Bret,

I have an 11 row HE oil cooler that I used the Vans firewall mount to mount on my 7A firewall. Yes I dig glup when they told me the price. I did this as a new build but I think it worked out pretty well as far as fitting and the location. Vans support got me pretty close with some information they provided.

Having said that I was able to optimize the position since I didn't have any else in that area of the firewall. That might not be the case for plane that is already flying. I'd be happy to send some pics of where I positioned it. Not to say other locations wouldn't work though.

[DanH]

Jimmy, is your IO360 parallel valve or angle valve?

[pecanflyboy]

Parellel valve, IO-360, 10:1, EIS, CS prop, James cowl, vernatherm removed, by-pass valve, oil to cooler controlled with ball valve. The SW 8406 puts me at 225F low altitude in Texas, this time of the year. I've seen it get close to 240F high altitude Colorado this time of year. If I cruise rich of peak, my oil temp will climb above 200F at 10,000'. LOP it will cool to 180-190F. I've done most of the stuff suggested on the forums. If I can squeeze a bigger cooler on the baffle, I'll be good in the summer time.