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#11220 - 08/21/10 10:54 AM How to convert Cessna 172N O-320-H2AD
andhi Offline
New Member

Registered: 07/30/10
Posts: 4
Loc: Indonesia
I own Cessna 172N (1978) with Lycoming O-320-H2AD. Due to AvGAs is getting hard to find I am considering to convert/ replace the engine with autogas STC'ed engine such O-320-D2J.

Does anyone can suggest me what is the best option that I have and which company give a best option in terms of support, cost, and performance ?

Thank's
Andy
andhig@yahoo.com

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#11230 - 08/21/10 05:20 PM Re: How to convert Cessna 172N O-320-H2AD [Re: andhi]
November X-ray Offline
Club Sponsor
Gold Pilot

Registered: 08/15/10
Posts: 1589
Loc: Brookshire, Texas, USA
Not only will the Engine require an STC, the airframe must be STC'd also to make it "legal", at least that is how it is here in the States. There are a couple of conversions in the works I found online that are using the General Motors LS series V-8 engines, perhaps if these obtain an STC soon, this might be a more efficient way to go. Vesta (www.vestav8.com) makes a chain driven re-drive and propellor system that fits on inline, V-6 and V-8 engines. I noticed you are located in Indonesia and since I am not aware of the flight rules for there, perhaps you can get a field approval for the auto engine. Also check out www.quietaviation.com


Edited by November X-Ray (08/21/10 06:13 PM)
_________________________
N. X.




www.cessna172club.com

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#11240 - 08/22/10 02:09 AM Re: How to convert Cessna 172N O-320-H2AD [Re: November X-ray]
Nightowl Offline
Club Sponsor/Speed Demon
Gold Pilot

Registered: 02/14/10
Posts: 1826
Loc: Northwest lower Michigan
According to Cessna Pilots Association, Penn Yan Aero Services and Air Plains Services Corp both hold STCs for installing an O-320-D2J or an O-320-D2G in a 172N.

Peterson Aircraft repair (Irving, TX) also holds an STC for "operation of airplane on leaded and unleaded automotive gasoline, 91 minimum antiknock index(RON+MON)/2" for the 172N.

John
_________________________
CP-ASEL-IA
'77 C172N, AirPlains 180 hp conversion

Our sigmap has been flown entirely using aircraft with capabilities at or below those of the C-172.


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#12788 - 10/03/10 04:54 PM Re: How to convert Cessna 172N O-320-H2AD [Re: Nightowl]
cgartly Offline
New Member

Registered: 10/03/10
Posts: 3
Loc: Kelowna, BC, Canada
Hi,

I am new to the forum but currently own a 172N with the O-320-H2AD. I have been looking for a mogas STC for a long time and have not been able to find one.

A search of the FAA STC website only reveals the following STC's:

Peterson Aircraft Repair, 1301 Wentwood Irving TX 75061 United States

SA1021SWSA1021SW Flap on switch on control wheel. Reissued 1977092009/20/1977
SA1042SWSA1042SW Hartzell-Wren beta control system. Reissued 1977092009/20/1977
SA513SWSA513SW Heavy duty brake kits. (Also eligible on Wren 460 and 460H aircraft). Reissued 1977092009/20/1977
SA626SWSA626SW Nose gear wheel and tire. Reissued 1977092009/20/1977
SA692SWSA692SW Reverse pitch propeller. Reissued 1977092009/20/1977
SA816SWSA816SW Hartzell BHC-A2VF-3/V8833 reversible pitch propeller. Reissued 1977092009/20/1977
SA874SWSA874SW Hartzell/Wren Beta System reverse pitch propeller. Reissued 1977092009/20/1977
SA901SWSA901SW Increased wing leading edge radius. Reissued 1977092009/20/1977
SA923SWSA923SW Droop ailerons. Reissued 1977092009/20/1977
SA930SWSA930SW Droop ailerons with flaps. Reissued 1977092009/20/1977
SA954SWSA954SW Installation of droop ailerons with flaps. Reissued 1977092009/20/1977

Do you have the STC number for the 172N with O-320-H2AD Mogas STC?

Thanks,

Chad


Edited by cgartly (10/03/10 04:58 PM)

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#12813 - 10/04/10 09:36 PM Re: How to convert Cessna 172N O-320-H2AD [Re: cgartly]
Don Tedrow Online   content
Gold Pilot

Registered: 07/16/10
Posts: 1759
Loc: Bastrop, TX
It appears you're out of luck. In any case, a lot of folks with MoGas STCs are having trouble right now finding fuel without ethanol in it. Some report luck at marinas, but fuel on the lake is often almost as expensive as 100LL.


From the Petersen MoGas FAQ page:

http://www.autofuelstc.com/autofuelstc/pa/Mogas_FAQ.html

Quote:
Q.I have an 0-320-H2AD, why isn't this engine approved?



A. This engine is slightly higher in compression than the other 160hp 0-320 models that were tested. Therefore a test program only applicable to the H model would be necessary. There are not enough of them to justify the cost of these tests.



Edited by Donald Tedrow (10/04/10 09:39 PM)
_________________________
1972 C172L



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#12846 - 10/06/10 03:18 AM Re: How to convert Cessna 172N O-320-H2AD [Re: Don Tedrow]
cgartly Offline
New Member

Registered: 10/03/10
Posts: 3
Loc: Kelowna, BC, Canada
I had done the research previously and found what you posted above. I had a glimmer of hope though when Nightowl posted. I'm hoping he jumps back on here and clarifies if there is something I am missing!

I was hoping that with the demise of the 100LL in the future that companies like Peterson would re-consider the detonation testing on the H2AD. I have no idea how many are left flying with that engine.

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#12861 - 10/06/10 05:02 PM Re: How to convert Cessna 172N O-320-H2AD [Re: cgartly]
Nightowl Offline
Club Sponsor/Speed Demon
Gold Pilot

Registered: 02/14/10
Posts: 1826
Loc: Northwest lower Michigan
The Peterson STC number as listed in the Cessna Pilots Association database is: SA2600CE

and is described thusly: Operation of airplane on leaded and unleaded automotive gasoline, 91 minimum antiknock index(RON+MON)/2. Intermixing aviation gasoline also approved.

It's listed in the CPA database as applying to the 172N, but does not mention the H2AD engine itself.

Here's the STC as listed in the FAA database:
http://rgl.faa.gov/Regulatory_and_Guidance_Library%5CrgPMA.nsf/0/AD3516EC889E73BE8525704A0061A215?OpenDocument

Hope this proves to include the H2AD engine, as it was the only engine the 172N was delivered with.

John
_________________________
CP-ASEL-IA
'77 C172N, AirPlains 180 hp conversion

Our sigmap has been flown entirely using aircraft with capabilities at or below those of the C-172.


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