Complete Engines for Sale

WW Corvair Engines For Sale

Completely Rebuilt And Test Run At Our Shop

 Over the years, we’ve built more than 100 high quality production engines for builders who opted to buy the  finished product from us. As a policy, every one  of these engines are test run and broken in on our run stand. A review of our and Web sites will show photos of dozens of engines we’ve built that are now flying. Our great experience with Corvairs, our use of only the highest quality parts and the test runs have given us a spotless track record with production engines. This record makes it easy to stand behind engines we’ve built. These engines are fully remanufactured, and converted for aircraft duty. People who have selected our engines, installed them on their aircraft and operated them as we recommend have had to do no work other than regular oil changes and spark plug replacement at 200 hour intervals. The TBO on the engines is 1,500 hrs.

Many people who have selected a production engine still opt to attend the Colleges to get to know the inside of their Corvair engine. I  encourage this because education has always been our primary work, and an educated Corvair pilot will be a better owner and operator.




To get started, please review this story, as it has the most up to date information on the process of ordering a complete engine for your plane:


Outlook 2016, Ordering a Completed Engine.




All of the engines we build are completely overhauled and modified with state of the art components made in the USA.  Our engines are built on the readily available Weseman 5th bearing. There are other options like a Weseman billet crank, which adds about $1,500 to the cost of an engine. We are glad to include any proven option on your engine.

All of the engines have forged pistons, and the larger displacements have new cylinders.  (The 2775 cylinders are re-bored GM originals.) They have forged rods with ARP bolts, harmonic balancers and  high volume oil pumps. Each engine has dual ignition and  electric start with a 22 amp alternator. The engines have  our gold oil system and the builder’s choice of billet or welded oil pan.


 The engines can be used on airframes as different as a KR-2S to a Zenith 750, so the carb must be a good  match for the airframe. For example, aircraft with low wings and fuel pumps require MA-3 or Ellison carbs, while  gravity feed airframes can use a wide array of carbs, including the affordable Stromberg. The Corvair has flown on  more than 15 different carbs, and we will be glad to assist you in choosing the correct one for your airframe.



Above, an engine we assembled for a builder. The engine is on our run stand outside our hangar. Every engine we assemble is test run and broken in on our run stand. The engine’s performance is carefully evaluated against dozens of others we have built. This test run allows even fine details such as the hot idle regulated oil pressure to be preset before the engine is delivered.

Above, a picture of a 3,000 cc dished “Dual Fuel” forged piston. These are made in the USA to our exact specification. These pistons are the heart of  Corvair engines. They allow these engines to run equally well on 100LL or high grade automotive fuel. The design maintains a very tight quench area to the head while keeping a moderate static compression ratio. Many alternative engines have electronic elements and valve designs that are not compatible with the high levels of lead in aircraft fuel. Others have excessive compression ratios that make operation on fuel below 100 octane a serious detonation risk.  No such issues exist with our Corvair conversions. When Corvairs were built, all automotive fuel was leaded; in the past 30 years they have proven to operate on unleaded fuel.  Corvair engines are not bothered by ethanol in fuel. The head in the picture was remanufactured by Mark at Falcon Machine.

Above, a look inside an engine during assembly in our hangar. As a direct drive, horizontally opposed, air cooled engine fed with a single carb, the Corvair engine is a model of simplicity and reliability. It has been powering experimental aircraft since 1960, and we have been continuously working with them since 1989. Many people new to homebuilding are taught by magazines to look at things which are “new and exciting.” All of my work has been aimed at testing and developing proven methods and systems that builders can count on. “Old And Flight Proven” is the opposite end of the spectrum. It is my personal philosophy that many more homebuilders have been served by “Old And Proven.” Builders who understand this fundamental truth of aviation naturally gravitate to our work with the Corvair.


Below are three example of assembled engines:

2,700 cc Engine, Weseman 5th bearing, 100hp continuous.

Above, Zenith 650 builder Becky Shipman and myself observe a break in run of her 2,700 cc engine at  Corvair College #22 in Texas. This engine was assembled in my hangar before the event.  Attending the event gave Becky a good look at what was inside her powerplant, and familiarized her with the  operational procedures. We encourage builders purchasing an assembled engine from us to attend  our Colleges. Read the whole story on Becky’s engine at this link: Shipman Engine at CC#22


2,850 cc Engine, Weseman 5th bearing, 110hp continuous.

Above, Roger Grable and his grandson Graham stand by their new 2,850 cc engine during its break-in run at  Corvair College #23 in Florida. This engine is now flying in their Zenith.  I assembled the engine in our hangar before the event.  Roger and his wife had attened CC#22 four months earlier, and had elected to have us build an  engine for his fast moving project. We have a fairly short lead time on complete engines, and Roger drove to CC#23 and  took delivery on the engine.  To read the complete story on Roger’s Zenith 750 engine, follow this link: Corvair College #23 – 2850cc Engine, Roger Grable, CH-750 Builder


3,000 cc Engine, Weseman 5th bearing, 120hp continuous.

Above, a 3,000 cc engine we built for the Zenith 750 project of Lary Hatfield and sons. We met Lary at the  Zenith open house at the factory, which he followed up by attending Corvair College #21.  In person, Lary is an easygoing guy with a laid back approach on the surface. When you learn more about his experience, you understand that he and his sons have worked very hard and had outstanding success in very competitive levels of automotive racing. They are equally accomplished in aviation. They have worked hard enough to afford to put any piston engine they choose on the front of their Zenith, yet they selected a Corvair after careful consideration. I take it as a compliment to our work with the Corvair when men of their mechanical experience carefully evaluate and choose Corvair power. A longer story on their project can be found on at:

A long time ago, I realized that a builder buying an engine from us was really purchasing more than a powerplant. He is making an investment in our judgement. Builders are looking for a good value in an engine, not the cheapest price. Airplanes are a lot of fun, but airworthiness is serious business. I appreciate this and cut no corners on engines that we build.

The single most important thing a builder can understand about our engine program is very simple, but often overlooked. Completed engines are a small portion of our efforts with the Corvair. Most of our work goes into teaching builders how to build their own engine and supplying the conversion and installation components. Carefully and correctly built engines actually are not a particularly lucrative part of our operation. We build them for several reasons beyond the bottom line: They are excellent demonstrators of the potential of the Corvair as we convert it; They provide a blueprint for builders assembling their own engines; and we often use them as assembly or test run demonstrators at Colleges. To serve the above purposes, they must be carefully built of the finest parts. Moral issues aside, there is absolutely no incentive in any form for me to cut any corner on any engine. A single issue in the field would undo the larger purpose of building the engines in the first place. We have been here for a long time, and every time I turn a wrench in the shop I am aware that I will be doing this in another 20 years also. There is no short cut to long term success.

Conversely, any company that makes its living just on complete engines, especially if it is an LLC, has an enormous incentive to cut corners on every part inside their engines. The only way they make money is by charging more, lowering their cost, or both. In tight economic times, price has a ceiling, so lowering the cost and cutting a few corners is the way to go. They can do the math, and every dollar they will ever make is based solely on this differential. They know that 9 out of 10 engines they sell will not go flying in the next 3 years. Organized as an LLC, they can walk away from the business without any financial obligation to their customers. If you’re new to aviation this may sound far fetched, but it is actually how the majority of alternative engine companies have been started, operated and dissolved in the past 20 years.

Our income is not based on the finite possibilities of the cost versus price equation. Our potential is directly related to the reputation that the Corvair enjoys as an affordable and reliable powerplant. The engines we assemble for builders enhance this reputation by being excellent examples of the conversion. Even the most cynical person who is yet to know my personal morality against poor products in experimental aviation can understand how we are only incentivized to build excellent engines.

If you are a builder interested in discussing an assembled Corvair for your project, let me suggest the following; take the time to read the stories in the links above. Also get a look at our main reference page, At the bottom of the main page is a search box that allows you to find any subject. The site has well over 1,000 pages of text. You don’t have to read it all (some of it is historical or dated), but you will find an excellent introduction to the engine. Then, write me with any questions you may have. Please include your phone number, and a good time to call you. We keep all the information confidential, but I find the phone a much faster way to cover builders’ questions. Understand that we get many emails every week asking about buying an engine. Some are scams, others are from 15-year-olds, some are from people asking if the engine will power a Lancair IVP, others asking what type of antifreeze goes in the engine. There may be one real builder in the group. In my experience, the real builder appreciates 30 minutes on the phone, and all the others want to have long protracted email exchanges. Set yourself apart, send your phone number.

Thank you.

William Wynne

7 Replies to “Complete Engines for Sale”

  1. I wish someone would tell me a ball park price on one of these engines without being told to buy a 75 dollar manual if i want to find out

    1. Cameron, no one has to buy a manual to ask any question. There are a number of different options on output, crankshafts, kit or fully assembled etc. The fastest way to get fully up to date pricing is simply call Rachel at 904 626 7777 extension #1, and she will be glad to share the exact information.

      1. Well I called Rachael, she said if I want that information on what model of engine I need for a core, then I would have to buy a manual. Ill leave it at that.

      2. Cameron, it says in many places on my site a core motor costs 100-300 bucks on condition. When I read your comment I first thought you were speaking of complete engine costs, that’s an easy phone question. To hunt a core motor effectively you do need a manual, there are over 50 letter codes on engines, and you need to see pictures of where to look, that cannot be effectively covered on phone.

  2. So, As I understand it , I need a core to buy a complete engine? i’m looking for the largest HP engine that you’all would build,and I need a price , from the firewall foreword.Thank You.

    1. Donald, the largest engine is the 3.3L engine , which is available as a kit from SPA, 904- 626-7777. There is a discount if you have a core, but you can also buy the kit outright. Parts to install it are on my shopping page here. You didn’t mention which airframe you are building, if you like, I encourage you to call me 904-806-8143

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