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Topic Options
#301828 - 08/03/16 11:32 AM Maple leaf aviation exhaust fairing
Jim_1 Offline
Gold Pilot

Registered: 04/06/11
Posts: 2258
Loc: ON, Canada
Well i Finally installed the exhaust fairing on my 172. This little unit does what it is supposed to do. My cyl temp would always be just under 400 on climbout, now 375 or 380. in cruise it has dropped lower than i have ever seen with a definite 15-20 deg cooler than it used to be. One interesting tidbit is that my wife says the plane now sounds different when i fly over. smoother as she says. i can only assume that the interaction between the prop and exhaust pipe in flight is now slightly different with the smooth Fairing over it. here is a photo.



Edited by Jim_1 (08/03/16 11:44 AM)
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#301857 - 08/03/16 02:38 PM Re: Maple leaf aviation exhaust fairing [Re: Jim_1]
Curious1 Offline
Gold Pilot

Registered: 03/12/13
Posts: 1393
Loc: Pacific NW, USA
Congrats on a very good outcome.

What engine do you have on your aircraft? Is it an O-320 or an O-360? It looks like the fairing is just fastened on with screws. What kind? Machine or ? Do you have any theories about WHY you got such a large drop in CHT's after you installed the fairing?
_________________________
"Safety" simply means "the risk is acceptable" - no more, no less.

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#301881 - 08/03/16 05:13 PM Re: Maple leaf aviation exhaust fairing [Re: Curious1]
Kinhop Offline
Silver Pilot

Registered: 11/08/12
Posts: 819
Loc: Saskatchewan
The installation is for nut plates on the cowl surface that these screws then go into. The reason for cooler temps is because the fairing covers off the part of the exhaust opening in the cowl that would "scoop" air into the lower cowling, and instead makes it so the slipstream pulls cowl cooling air "out" of this opening, like a venturi effect. Well thought out, and works.
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Craig

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#301886 - 08/03/16 06:30 PM Re: Maple leaf aviation exhaust fairing [Re: Kinhop]
Pilawt Offline
Club Sponsor
Gold Pilot

Registered: 02/13/10
Posts: 1863
Loc: AZ
I have a 172N with O-360, long-stack Power Flow, and a Maple Leaf fairing. I fly a lot in the desert southwest, and I have never seen >380 degrees on any cylinder, even on the hottest days.

_________________________
Jeff Jacobs
C-172N-180
KGYR / Phoenix, AZ

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#301902 - 08/04/16 06:16 AM Re: Maple leaf aviation exhaust fairing [Re: Pilawt]
Ernani Offline
Pilot in Command

Registered: 01/16/16
Posts: 354
Loc: Itapeva SP Brazil
Great I will build one myself. Since I worked with composites part of my professional life and presently we are finishing a One Design aerobatic aircraft I believe is a piece of cake.
Indeed I built a new ruder fin where the beacon is located in carbon fiber and looks far superior to the ones I have seen, both aesthetically and structurally .
No FAA equivalent in my country checks that.

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#301908 - 08/04/16 07:20 AM Re: Maple leaf aviation exhaust fairing [Re: Ernani]
vettdvr Offline
Club Sponsor
Diamond Pilot

Registered: 06/24/10
Posts: 7724
Loc: Slidell La
The Maple leaf faring is the one I would use on my 172. I think? confirm?? it takes STC to add it? or will the 337 be enough. My AP told me he has installed them before and they WORK.
_________________________
Vettdvr

Single/Multi/instrument/type/commercial But then I am still learning.

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#301918 - 08/04/16 10:31 AM Re: Maple leaf aviation exhaust fairing [Re: vettdvr]
Jim_1 Offline
Gold Pilot

Registered: 04/06/11
Posts: 2258
Loc: ON, Canada
It comes with everything you need and comes with the STC for your aircraft when you order it.. Apparently it is a special fiberglass compound that resists heat much better. they indicate if it needs repair you cannot use regular fiberglass components for this reason. Took me a fair while to install. They send spacers/shims with it to ensure you have the spacing required to the pipe. you need more space on the copilot side as the engine torques. Taped it exactly in place, then drilled /removed cowl and installed all the nutpltes. Then primed and painted after done.
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#301953 - 08/04/16 06:18 PM Re: Maple leaf aviation exhaust fairing [Re: Jim_1]
Ernani Offline
Pilot in Command

Registered: 01/16/16
Posts: 354
Loc: Itapeva SP Brazil
Jim 1 how much did you pay for it?

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#301966 - 08/04/16 08:29 PM Re: Maple leaf aviation exhaust fairing [Re: Ernani]
Pilawt Offline
Club Sponsor
Gold Pilot

Registered: 02/13/10
Posts: 1863
Loc: AZ
Whatever they make them out of, the Maple Leaf fairings are tough. Mine has been on there 15+ years; no chips, cracks, etc. It's held up better than the fiberglass factory wheel fairings.
_________________________
Jeff Jacobs
C-172N-180
KGYR / Phoenix, AZ

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#301991 - 08/05/16 08:46 AM Re: Maple leaf aviation exhaust fairing [Re: Pilawt]
Jim_1 Offline
Gold Pilot

Registered: 04/06/11
Posts: 2258
Loc: ON, Canada
it was $250 plus shipping. Pretty reasonable i think considering you get all the required documentation... and very well made. i had some questions when installing and they hooked me up with an engineer and he was very good also.
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#342756 - 06/12/17 12:01 PM Re: Maple leaf aviation exhaust fairing [Re: Jim_1]
Pilot5107F Offline
Gold Pilot

Registered: 01/16/16
Posts: 1120
Loc: East Texas
So I was going to order it but I'll wait as with my other modifications to see what my current temps, times, speeds, distances, etc are before and after.
_________________________
Current:
172H-180hp, 800&600 tires, Hoerner Wingtips (Soon: Powerflow & maybe VG kit)
TA37 Vaca-Moo airport

Previous:
Seneca, Cherokee6, Grumman Tiger AG5B, Citabria 7ECA, Pilatus P3, Quicksilver (E-AB), Hiller 12C, R22 Mariner, PR53 Sabanera Heliport

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#345960 - 07/09/17 08:01 PM Re: Maple leaf aviation exhaust fairing [Re: Pilot5107F]
Bimota Offline
Second in Command

Registered: 05/19/16
Posts: 210
Loc: Tennessee
I just received my Maple Leaf exhaust fairing.

The reason I bought it was to lower the cylinder head temperature at peak exhaust temperature (yellow line).

According to the Lycoming chart the highest exhaust temperate is at the top end of the economy flight zone. As you fly further 'lean of peak' from maximum exhaust temperature the cylinder head temperatures go down, but so does the power. Yet the fuel economy remains the same.

I intend to fly at maximum exhaust temperature and have the Maple Leaf exhaust fairing keep my heads cool.

A word of warning: Do not fly 'rich of peak' as the cylinder head temperatures are even higher than at maximum exhaust temperatures.

Your thoughts and comments are welcome.


Edited by Bimota (07/09/17 08:05 PM)

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#345969 - 07/09/17 10:39 PM Re: Maple leaf aviation exhaust fairing [Re: Bimota]
Pilawt Offline
Club Sponsor
Gold Pilot

Registered: 02/13/10
Posts: 1863
Loc: AZ
Originally Posted By: Bimota
A word of warning: Do not fly 'rich of peak' as the cylinder head temperatures are even higher than at maximum exhaust temperatures.

Your thoughts and comments are welcome.

I think the Maple Leaf fairing is a good investment, for both improved cooling and reduced drag.

You are correct that the highest CHTs are right around 125-150 degrees rich of peak EGT, and that engines can run cooler lean of peak. I ran my K35 Bonanza lean of peak smoothly and economically, with cool CHTs.

The problem with this as it applies to our 172s, though, is that our carbureted engines generally have very uneven distribution of fuel among the cylinders. You might have one or two cylinders lean of peak, but two others right at the hottest ROP spot. Get them all lean of peak and they'll be so uneven that the engine will run very rough. My O-360-A4M won't get anywhere near LOP on the hottest cylinder before the engine runs alarmingly rough.

My Bonanza, on the other hand, was fuel-injected, with balanced GAMI injectors.

So the best I can do with my 172's carbureted engine is the good ol' "lean until it's rough then enrichen until smooth."
_________________________
Jeff Jacobs
C-172N-180
KGYR / Phoenix, AZ

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#345972 - 07/09/17 11:01 PM Re: Maple leaf aviation exhaust fairing [Re: Pilawt]
Joeman434 Online   content
Diamond Pilot

Registered: 02/19/14
Posts: 6240
Loc: Ocala, Florida
Originally Posted By: Pilawt
Originally Posted By: Bimota
A word of warning: Do not fly 'rich of peak' as the cylinder head temperatures are even higher than at maximum exhaust temperatures.

Your thoughts and comments are welcome.


So the best I can do with my 172's carbureted engine is the good ol' "lean until it's rough then enrichen until smooth."



I haven't found a better way....don't believe there is.

I still run slightly ROP...especially in my 210. If not, it eats valves and guides. 27 years and two engines, I've tried every combination in the world, and the best I can get results from is ROP. Running LOP in my 172 and 172RG, the oil temperature climbs too high for me, while the EGT and CHT are normal, so running ROP the oil temperature will run lower.


Edited by Joeman434 (07/09/17 11:01 PM)
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Do it right the first time.

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#345985 - 07/10/17 07:43 AM Re: Maple leaf aviation exhaust fairing [Re: Joeman434]
Bimota Offline
Second in Command

Registered: 05/19/16
Posts: 210
Loc: Tennessee
The graph I was looking at was for a Lycoming O-360 and showed the correlation between power and cylinder and exhaust temperatures and fuel burn.

Maybe my 150 horse power O-320 will be less stressful on an engine than a 180 horse power O-360.

To combat high oil temperature. I replaced the oil cooler during it's overhaul. I always drain the oil from the oil cooler at every oil change. I intend to learn how to flush the oil cooler at every 100 hour service and annual.

Currently I'm on a 25 hour oil change regiment since my engine is at 75 hours. Draining from drain plug, sump, screen, oil cooler and filter.
But since I know the owner of a oil distributor and can get oil at cost, which is far cheaper than even the wholesale price. I'm tempted to go to a 20 hour oil change just from the drain plug without removing the cowlings until every other time.

Has anybody thought about switching to Lucas Oil Synthetic SAE50 or Royal Purple Synthetic SAE50 or Amsoil Synthetic SAE60?
On my aircooled V-Twin motorcycle it helped cool the engine considerably during the not summer months.

I wish I had bought a full engine analyzer instead of a single probe EGT. But then it would only make me even more neurotic.


Edited by Bimota (07/10/17 07:52 AM)

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#345986 - 07/10/17 07:54 AM Re: Maple leaf aviation exhaust fairing [Re: Joeman434]
cadcap Offline
Gold Pilot

Registered: 11/17/11
Posts: 1546
Loc: NW Indiana
My engine shop says absolutely do not try running a carburetor engine like an O-300 lean of peak. Without balanced fuel injection it is a BAD IDEA ! So I do like some of you have already said lean till a bit rough and richen til smooth.
Thought about spending the money on a multi-cyl. analyzer but my IA says it won't make running LOP a possibility so maybe I'll save the money for a bigger Titan IO-370 conversion and THEN run LOP!

I'll prolly need to run LOP cause I won't have any money left to buy gas with!!!
_________________________
1967 172H "Bronze Lindy" OshKosh '13


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#345991 - 07/10/17 11:53 AM Re: Maple leaf aviation exhaust fairing [Re: cadcap]
scorwin Offline
Safety Pilot

Registered: 05/19/16
Posts: 50
Loc: DFW, TX
Another data point for the exhaust fairing. Just had it installed during my last annual. Temps now consistently 15-20 degrees cooler. Especially important in the DFW area during the summer!

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