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Old 05-26-2020, 11:49 AM
flybywire flybywire is offline
Join Date: Feb 2010
Location: Santa Barbara, CA
Posts: 8
Default Oil cooler mod from . . any luck?

My RV-7 oil temp consistently runs hot IO-360 (around 230* on hot days). This company has a mod which uses a bigger cooler and angle mounts it near the engine mounts with an air baffle. Anyone see lower temps with this mod?
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Old 05-26-2020, 12:19 PM
rapid_ascent rapid_ascent is online now
Join Date: Mar 2008
Location: Dublin, CA
Posts: 1,212

I installed the Van's firewall mount in preparation of getting my IO-370 running. I liked that approach.
Ray Tonks
2020 Donation Paid
Titan IOX-370, Dual PMAGs, 9.6:1 Pistons, FM-150
RV-7 Fuselage in progress
* Cabin Interior - In progress
RV-7 SB Wings
* Both Wings fully skinned
* Fuel Tanks Complete - No leaks finally
* Ailerons Complete
* Flaps Complete
RV-7 Empennage - Complete (a little fiberglass work left)
Vans Training Kit # 2 - Complete
RV-7 Preview Plans
Vans Training Kit #1 - Complete
EAA Sheet Metal Class - Complete
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Old 05-27-2020, 05:43 AM
KatanaPilot KatanaPilot is offline
Join Date: Feb 2015
Location: Locust Grove, GA
Posts: 616
Default Airflow Systems

We installed an Airflow Systems oil cooler on our RV-7A. I believe it was a 2006X and we mounted it on the firewall using the AFS mounting kit. We have too much oil cooling (hard to get to 180 on a slightly cool day), so we just installed a butterfly valve with a linear actuator to modulate the valve.

Since you have a 7 and not a 7A, I don't know if this would work given the differences in the motor mount. Bill at Airflow is very helpful and knowledgeable.

The picture is from last year before we installed the butterfly valve.

Krea Ellis

Locust Grove, GA
DA20-A1 "Princess Amelia" - gone home to Amelia Island
RV-7A Phase 2
RV-10 under construction at Synergy Air South
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Old 05-27-2020, 10:01 AM
flybywire flybywire is offline
Join Date: Feb 2010
Location: Santa Barbara, CA
Posts: 8

Brilliant. Thank you!
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Old 05-27-2020, 09:45 PM
wnplt wnplt is offline
Join Date: Feb 2013
Location: Idaho
Posts: 170

Check your vernatherm. My buddy had very hot oil temps. Replaced the Vern and all was normal.
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Old 05-28-2020, 06:46 AM
Avengerboss Avengerboss is offline
Join Date: Dec 2008
Location: Ramona, Calif.
Posts: 297
Default Oil cooling.

Iím doing the show planes oil cooler system on a recently completed 7 with the IO 360 in a couple weeks . Got the kit, looking fwd to see how well it does.
Finished and flying our 10
finished & flying 14A assist build SOLD
Building another 7 !!! Finished
Started another 14A assist build, Done
Built: two 7s, two 8's, two 9As,10,12, assisted in 2 RV14As ,RANS S7
RV Jackpoints mfg'r ""
Dues paid, And an ADD
Didn't know retirement was such hard work!!!!!
When does a repeat offender stop????
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Old 05-28-2020, 08:45 AM
ultimate10201 ultimate10201 is offline
Join Date: Feb 2006
Location: McKinney, TX
Posts: 26
Default Oil cooler for RV7

I have an IO360 A1B angle valve on my RV7. CS prop. No inverted oil system. Oil cooling was managed sort of adequately with a 7 cell cooler mounted on the baffle behind #4 cylinder. I was running Shell 100W Plus. Last year on a particularly hot day at full gross and an extended taxi after picking up a passenger, I saw oil temp go up to 228į. It settled at about 220į at cruise with OAT around 86į. Engine compartment was plenty hot because fuel was vaporizing during the taxi out, giving a rough idle but which cleared with full power. Been flying the plane for 6 years, but I didnít worry about oil temps because even though Iím in Texas, I donít fly much in high OAT. Upshot is I didnít have enough cooling capacity for that engine if I wanted to really work it during a climb or in hot weather.

Problem with adding a bigger cooler is the gear leg tube welded integral with the the motor mount for the taildragger version reduces open space behind and below the engine. With careful planning I suppose the bigger cooler can be managed during construction, but finding a place for it after the plane is built was a real issue for me.

I opted to add a second cooler on the baffle behind Cylinder #3 with oil lines in series. While I was at it, I made the little baffle channel to make sure air flows around the aft fins of #3 cylinder. I did a little minor Ďcaulkingí with red RTV, too, but I didnít have too many gaps.

Now, my oil temps are right around 183 to 186 on very warm days - pretty close to vernatherm operating specs. Max Iíve seen on a non stop aggressive climb to 9kí was 191 which settled back at cruise. On taxi back from landing, Iíve seen 190 due to limited airflow through the cowl.

It was one of those rare fixes that really worked well.
Daryle L. Grounds
McKinney, TX Based @ T31
RV-7, N33DG, IO-360-A1B, Hartzell C/S, Flying since 12/15/12; Swick TCraft under construction
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Old 05-28-2020, 07:53 PM
treetopin treetopin is offline
Join Date: Jan 2012
Location: Longwood Fl
Posts: 4

I'm installing that mod as we speak. Have an IO360A1B6 with CS and a James cowl. Summer temps on climb as high as 235 with 220-225 as cruise down low. Just getting started in conjunction with the condition inspection so it will probably be 10 days or so before I can test it. So far it's pretty straight forward, will report findings when I can
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Old 05-31-2020, 09:19 AM
flybywire flybywire is offline
Join Date: Feb 2010
Location: Santa Barbara, CA
Posts: 8

Great! I would really appreciate that! Thanks!
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Old 05-31-2020, 10:16 AM
PilotjohnS PilotjohnS is offline
Join Date: Jan 2016
Location: Southwest
Posts: 1,007
Default Chts and 2 coolers

So with two coolers are you seeing higher CHTs since more air is flowing thru the coolers?
John S

WARNING! Information presented in this post is my opinion. All users of info have sole responsibility for determining accuracy or suitability for their use.

Dues paid 2020, worth every penny

RV9A- Status:
Tail 98% done
Wings 98% done
Fuselage Kit 98% done
Finishing Kit 10% working canopy
Electrical 5%
Engine In Stock
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