Mechanical Fuel Injection for Aircraft! - Airflow Performance Explains

[@kaweeka]

Nicely done and good topics so far. I have an older FM100 on my RV-9A. After 10 years, it was time to send it back and have him go through and replace old worn out components. Excellent service. FYI, there is a fuel injection class they put on every year. It's on my list and everyone that has attended says it was phenomenal.

[@CrystalCanyon100]

Great explanation of Fuel injection.

[@philbirk]

Don and his crew are the best!! He has my RSA5 now. I wonder if that was it?Good job on the video.

[@justinharrison9463]

Nice work, I have always been curious about mechanical injection.

[@ExperimentalAircraftChannel]

Thank You for taking the time to watch and support here. I appreciate you.

[@colebishoff1533]

Wow, this is genius! I had no idea you could be so accurate with rubber diaphragms and springs. Super interesting

[@yeagermcbipper9008]

They really are not accurate. An EFI setup would give better performance, but mechanical systems are fairly simple. Springs and diaphragms all have ranges as they are 'analog' devices. So while a spring may test spot on a 60% compression, at 50% it could give a non-linear result due to the metal/coil etc. That would negatively affect the accuracy of the entire system. It works, it's simple, but there are better ways to meter fuel.

[@v.e.7236]

My father use to race a '66 Chevelle that had a 327 w/ mechanical fuel injection and he always won his class at the strip. He said the key was getting the proper combo of vacuum diaphrams and the springs that actuate the valves, needles, etc. Every one at the strip thought my father was somehow cheating, as there were constant complaints from the other drivers. They could never find any violation and, of cousre, there was always the walk-off cursing. My father finally stopped going because of all the crap from the other drivers, which steered me away from ever going to a strip myself.

[@dantheman1998]

a Hillborn setup or a Rochester?

[@v.e.7236]

@@dantheman1998 Stock Rochester unit, as I recall.

[@geofferylibrom4730]

Thanks for this video which is not easy to find on the internet.

[@MrBlacks5]

Pretty cool. I know how to lock wire if you ever get too busy.

[@maheralazzawi7814]

good job

[@SmittySmithsonite]

That was pretty neat! Wish they made stuff like this for automotive and motorcycle applications. I hate computers - this would be right up my alley. Thanks for sharing, Bryan! 👍🍻

[@429thunderjet2]

Naw you really don't, EFI is way more precise. I don't think anyone would much like the starting, operation, economy and driveability of mechanical fuel injection on a ground vehicle. I think it sure is nice to just turn the key and go, you don't need to touch the throttle or anything with the EFI systems we have on our ground vehicles today. Aviation technology is decades behind in those respects, unless we talk about the computer controlled 900 series Rotax aircraft engines and they are more advanced and way more economical to run than the legacy aircraft engines. Just like the old mechanical Corvette fuel injection and GM didn't produce it for very long because it didn't work that good on the street. For an all out race car it's fine, like a mechanicaly injected engine on methanol in a Sprint car that has an injector stack for each cylinder and delivers mass quantities of fuel and air to make big power for the track, and they work best at wide open throttle for thirty or so laps on a half mile or shorter track. So you see no, not so much. In my opinion...

[@429thunderjet2]

Yes that was very interesting Bryan, despite what I said in my prior post, I as well would have liked to have heard more specifics but yeah it no doubt could have easily taken an hour or more. 👍

[@SmittySmithsonite]

@@429thunderjet2 - I hear that from everybody, but as a mechanic, I prefer carburetion. When tuned right, I can get a carbureted engine to perform very close to as good as FI as far as fuel economy goes, but with MUCH faster throttle response. Just takes a bit more effort to do so. Most of the issues with the 'Vette's mechanical FI were cold-start related (and a failure prone vacuum device used for a cranking signal), and I'm sure it cost GM quite a bit more than a carburetor. It was that and it's limited numbers that killed it. The system right here for aircraft is FAR superior to that system in every way. I'd rather have this on a modern car than failure prone electronics.

[@EatPezzzz]

@@SmittySmithsonite Don't know what you're talking about "failure prone to electronics". I've done LS swaps for the last 20 years. It's VERY rare to have an electrical failure, and if you do the whole engine doesn't shut down, it just runs bad until you plug in a scanner and check it out. So much easier than dealing with carbs, mixture issues, distributors, and generally, 70 year old engine designs.

[@Mrsournotes]

Very interesting. Thanks Bryan.

[@ExperimentalAircraftChannel]

YOU are VERY welcome! Thank You for taking the time to watch and support here. Very much appreciated!

[@michaelhille261]

Great video thanks for sharing 👍🏻

[@AZVIDS]

Love my fuel injected engine, nice video!

[@danah358]

Great subject! Good Q&A. Some other comments/questions that would have been nice.... - at the beginning ask him how he got started in this business, did he start it himself or did he purchase it. Great opportunity to ask questions like that and better undrrstand AirflowPerf Co. - while he described all the complex parts req’d for mech FI, would have been interesting to ask him to compare his product to an alternative like electronic fuel inj(EFI). - minor question I would have asked is if the supplied injectors/nozzles are balanced or confirmed they have even fuel flow. Thx for making these vids! -

[@ExperimentalAircraftChannel]

Thank You for watching! Honestly I would love to go longer and deeper into subject matter, but then most people will not CLICK on a video that is more than 20min long, and especially not 30min-60min. So I try to keep these short and to the point where possible. I would like to go back and do some "On Aircraft" tuning and see the installation on an Engine etc. .

[@jzawodn]

Agreed... those are questions I'd like answered too. :-)

[@3sgteleak]

Hey Dana H I’m not sure if your inquiry was answered by the poster or not but my two cents about the nozzles being balanced or analyzed for flow characteristics are that they have they understand the science behind fuel flow, and would verify the proper operation of each mechanical dynamic component for quality control especially because the process is as easy as assembling the system on a test bench and evaluating fuel flow against x fuel pressure at x vacuum. Even in the automotive world flow testing is essential to quality control

[@glikar1]

Nice injection set up! Did I miss something, is it like a waste spark system, it sprays all ports every compression stroke?

[@fabrymars]

Very happy to learn from Don how to overhaul a fuel system in my trip to Spartanbourg. See you soon Don & Colleen. Fabrizio

[@sierrajuliet7722]

Thanks for the great video!

[@stealhty1]

Thanks for the Explanation , so why is it so hard to start one of these engines ??

[@RaceMentally]

Start? Hell that’s the easy part. Try landing with it and the engine dies. Hate this bs set up.

[@HootisGarage]

I’m still confused about the flow divider. Does every cyl get fuel regardless of firing order?

[@MrWATCHthisWAY]

Bryan, Peter just put out a video explaining what he’ll be posting during flight testing. I think he was answering my question regarding videoing flight testing. I believe he was directing these answers to us both because he mentioned before that he wasn’t going to put out videos during the flight test and no one else asked this question or even mentioned it. So I guess the answer is that he is not interested in having you come down to video any of his flight testing. What if you just showed up to Cherokee Airport and started videoing his flight testing. Don’t know if you would need the airports permission?? Lol.. No I wouldn’t unless invited!!! I tried to get a answer but I guess in a round about way he gave us one. Sorry I tried. 😞

[@RaceMentally]

I sure am having issues with my system. Not sure if someone can come out and tune it but it’s been a headache to use and have.

[@paulslevinsky580]

How does the flow-divider prioritize fuel to the port that is in the intake phase? It can't possibly run like a slave spark.

[@CDB1952]

it doesn't these are continuous flow injection systems. There is NO timing of the flow to the individual cylinders.

[@Jake2670]

need to time ur ads better

[@ExperimentalAircraftChannel]

Thank You. I will look into that. Sorry if they are annoying. They help to make this channel possible for sure. I appreciate you taking the time to watch and also provide feedback so this channel is successful.

[@genecalkins4555]

Do you make a unit for the cont O-200 100hp??

[@ExperimentalAircraftChannel]

Good question. The link to their website, and email on their website, can be found in the link in the description here. Thank you for taking the time to watch and support here!

[@hansiepeens7024]

We’re do we get a prize on this injector carb

[@ExperimentalAircraftChannel]

Give Don a call and have a conversation with him. Link in the description of this video. Tell him you saw it here. :-)

[@hansiepeens7024]

Cant give a call no number to call to. Need a adress to reply to pls

[@jameswolkins7616]

Great video do they sell parts.

[@ExperimentalAircraftChannel]

Thank You! YES.... check out their link in the description here. They have an online store and of course you can call or email them with questions.

[@asiasmells71]

Because I'm no expert!!! I would have asked if there is or isn't a fix or change needed to the fuel flow calibration with regards to those that want to run 98 octane. The spacific gravity of 100LL is 68-74 API and 98oct is around 84 or maybe I'm just over thinking it haha

[@ExperimentalAircraftChannel]

Dan.... great questions. Honestly. Thank You. Over think away. Maybe in the future, as I work out better scheduling for interview, I can put a request out to everyone of the questions that they may have. Been a lot of times, based on their schedules, these interviews are VERY last minute. Thank You for watching and supporting here. I truly appreciate You!

[@bobwhite193]

Ask Airflow performance directly. I've adjusted for fuel, in a non aircraft application, but would rather not elaborate for fear of misrepresentation. You'll find Don Rivera and crew are quite attentive to your questions.

[@yeagermcbipper9008]

It really depends on what ratio you want to obtain. That would determine the jet size. The fuel is pressurized, so flow it not really a problem.

[@MetaView7]

You need a gimbal for your camera.

[@paulkearns8838]

The 3 biggest wants for my certified O-320 are: > TBI > EI > GAMI100UL. It’ll run like a new engine and be super reliable with those improvements. It’s shocking how the FAA has kept certified engines in the Stone Age for ‘safety’ 👎🏻

[@helicoptermanpradipmohite]

Plz send me this video in Hindi language

[@yeagermcbipper9008]

Good Video. Spend the $ for a lavalier mic. Seriously. Your videos are good, but the sound is just not great.

[@ExperimentalAircraftChannel]

Thank You for the input. YES... Now that this has become a Full Time job I definitely need to invest in some equipment. Baby steps. This is still in it's infancy and tight budgets. Have you any suggestions for quality products and a source? Wire and Wireless? Thanks again for your support. I truly appreciate you!

[@yeagermcbipper9008]

@@ExperimentalAircraftChannel KZbin have dozens of sound people that go way in depth about mics. just search on lavalier mic and you'll bet some very good reviews. We use one for team meetings at work and they are so much easier to use than a mic.

[@mmomsboy]

If he could just stop the wife on the vacuum cleaner for a little while

[@quidestnunc9238]

Clip-on microphone, puh-leeze! Room echo is simply unprofessional. You do good audio work on most of EAC videos; this is an (unfortunate) exception.

[@chippyjohn1]

Icing occurs in a carburettor due to the rapid pressure drop of the air travelling over the venturi, little to do with fuel entering. A carb requires a low pressure to pull fuel in as it is not supplied by a pump, it uses atmospheric pressure to push it in. This injection system uses what is essentially pitot tubes to reference pressure. 100% duty cycle fuel injection is very old, it serves little benefit over a carburettor. It is basically the same as having individuals carbs. Sequential injection is far better as it only injects fuel at the time of the intake valve being open, preventing fuel stand off. Mechanical sequential injection has been around since the 1930's which is more advanced than this, no different to diesel injection. EFI is far better than all of this, simpler, lighter, cheaper, better atomisation and far more accurate.