Lycoming 0-340

N1264D · Post by **N1264D** » Mon Sep 25, 2006 2:33 pm

Has anyone flown a 170 with lycoming 0-340? What did you think. I recently saw one for sale and thought it might be a good plane with 170 hp and cs prop. How difficult is it to get parts for the engine, and are there many available? I saw the club offers an the stc paperwork for the engine.

A couple of years ago I owned a 170A. I sold it when I moved to where the weather isn't so good and there is lots of salt water. I am now looking for a B model as I am moving back to the dry interior of AK away from all this wetness and corrosion!

I am very happy to be hunting for a 170 again!

Post by **Bruce Fenstermacher** » Mon Sep 25, 2006 3:11 pm

I think these engine converstions are pretty rare. Most went with the 180 when doing the conversion.

We did have a fellow at the last convention with one and he seemed pleased with it overall except of course for finding engine parts and anyone who new anything of the conversion.

If the paperwork isn't in order and with the plane you looking at it could prove to e very difficult to get and clear it up.

While the Associations does offer copies of many STCs as well as samples of 337s, just buying someones copy of their STC paperwork DOES NOT make the plane you own with the modification legal.

spiro · Post by **spiro** » Mon Sep 25, 2006 9:52 pm

these days they're a pretty rare engine and parts will be hard to come by. They were originally used in APU's, so were cheap on the salvage market. The O-360 superceded this engine but the engine mounts and STC are different, so you don't save anything when the O-340 craps out and you need to replace it with something else. Twice I've looked at buying an O-340 powered C170, and twice I've passed.

- paul

Post by **GAHorn** » Mon Sep 25, 2006 10:42 pm

I'd like to re-iterate Bruce's comment....
The Assoc'n may offer copies of "stc" paperwork...but that is not the same as buying an STC.
The only STC I know that TIC170A sells directly is the O-300-C/D installation that past president Ron Massicot donated.
Otherwise, if you purchase the copies of STC's, Form 337's, (field approvals, etc) that reflect the paperwork of someone else's modified airplane.... ALL YOU ARE GETTING IS EXAMPLES OF PAPERWORK which you might find useful in convincing the FAA that YOUR airplane is a suitable candidate for approval of similar modifications.

Bottom Line: You must purchase STC paperwork directly from the owner of that STC if you wish to have a legal installation/approval for your airplane.

blueldr · Post by **blueldr** » Tue Sep 26, 2006 3:24 am

The Lycoming O-340 was a certified engine and was used in the "Doyn" (Sp.) conversion on the Cessna 170.

It is a rather oddball engine size and I have never made any real effort to determine what airplane used them as original equipment. Someone told me it was used on some model of a Beech airplane.

Post by **GAHorn** » Tue Sep 26, 2006 3:36 am

Lots of anecdotal information makes the rounds, but generic statements about most aircraft engines are based on lack of information.
Example: http://www.lycoming.textron.com/main.js ... /myth.html

or170B · Post by **or170B** » Fri Sep 29, 2006 3:30 pm

I owned a 170B with this engine and C/S prop for 6 years. I sold it in 2005 and bought a 180hp 170B. The 0340 was a good perfomer but dificulty in finding parts, crankshafts and camshafts were non existant for this motor. Also the prop was very dificult to find parts for. It took my prop shop almost six months to find a serviceable hub. I would recomend staying away from this conversion.

28Charlie · Post by **28Charlie** » Sat Oct 07, 2006 12:33 am

If it's the one in Palmer, the plane has sat for a number of years, and the cs prop can only be had from Hatzell for $19,000, that's not a typo. I understand there is an effort to find a fixed pitched prop to get it back in the air? Otherwise it's a very nice 170 with factory float kit.