We all have to appreciate, there must have been many study and research hours invested in this event. You have developed a substantial (experience-based) knowledge pool on these engines.

Loving the transparency of all the work you do and the little problems you get . Really helps the next builder for sure. Great content as always

“Turbo” can’t wait for the build.

The good old "sprag" clutch is a marvellous piece of engineering. For the most part they are trouble free. I have never had to replace one on all the motorcycles that I have owned. Glad to see that you resolved all the sync errors. We used to have carburettors years ago. Now everything is fuel injected and you just about need a science degree to understand the blasted ECU's. Ugh!

Purchased two of the Varlas, Had them for a year. Love them!

Most engines that I work on ,without active valve timing, only use the cam sensor during starting. I have noticed that some will start after extended cranking when you let off the starter, and then run fine until you shut them down.

This is a good lesson that all anomalies to expected operation should be investigated. Good troubleshooting.

It really is amazing what can be learned from reviewing engine data with these new engine monitors. I’m sure there have been volumes written on interpretation of the data

Casey Hauck and Bryan Dacus do great work, nice airplane and install on your part, too!

Great info. Love the in depth video and root cause finding.

If I had the same sort of problem on my 912 I would be able to fix it that easily either. On my aircraft I would have to pull the engine

As always, great stuff. Keep it up Bryan

I think you should put the new parts in the airplane; not an engine on a bench.... .. a spare engine of unknown condition; glade you finally put the parts in the airplane. Did you notice that the battery voltage with 200k errors was 11.7 and ran better at 12.3, but no errors at 13.2v

A+ Content ... only learn from problems /and difficulties

I ran into a issue that was somewhat similar on the Older GE CT Scanners, where a screw would loosen and you'd loose position sense on the moving carriage that held the X Ray tube

Not sure about the AEM ECU's but most ECU's on the automotive side and also on John Deere products will eventually start with just the cam or crank sensor reading correctly. You just have to spin the engine over longer for the ECU to figure out the correct timing

@sleepyta

Жыл бұрын

I should elaborate: I am a Deere technician

@BowenAero

Жыл бұрын

I'll have to ask Bryan Dacus about that.

Let us know what the fuel burn is. I bet it improves.

That turbo apex is gonna be a monster. There's a guy on KZread putting a 998T in an S-21. Have you looked at that engine at all?

@BowenAero

Жыл бұрын

Still has issues to be worked out. I am keeping a close eye on the sidewinder engine, but I'm going to let others prove that set up while I enjoy the APEX.

Weird... Wonder how it was hooked up in the Snow mobile that allowed it work correctly? Wouldn't it be hooked up the same way in the plane? Glad you are back up and running........ fly safe.

@BowenAero

Жыл бұрын

We use a different wire harness and ECU.

@Kitfoxj

Жыл бұрын

@@BowenAero Ahhh.....Still a weird issue.... I wonder if something in the sensor changed? Loss of a ground? Either way, sounds, like you have it dialed in now.

@BowenAero

Жыл бұрын

@@Kitfoxj Well I tried two different sensors.

Might be with just this motors crank posion sensor but not with the original.

Bryan, i did not hear or catch the jist of the clutch issues..........Am I correct to assume this was a installation caused problem? I mean it begs why the engine ran with the wires crossed so that did not help but why wouldn't this have been noticed with the detailed engine logs from AEM device readouts..............I really like that setup. I don't currently have a method for seeing such detailed logs from my RX1 installation. But then it just runs and runs over 5 yrs. with no problems with the engine. Great video's. Thanks for the updates regardless. Great diagnostics Too!

@BowenAero

Жыл бұрын

The clutch issue was caused by the continuous long cranking to get it to start. The starting system isn't really designed to spin the gearbox and the propellor weight, so my theory is that the hard starting caused the starter clutch to fail. The hard starting was caused by the crank sensor polarity being wired backwards. It was discovered in the engine data logs, but we had to be looking for it. It isn't really something you would normally check I suppose. Of course we will be now.

@bertruttan129

Жыл бұрын

@@BowenAero Thankx for the response. My conclusion than would be the hard starting which lead to the clutch failure was precipitated by the repeatedly unnecessary long starts as opposed to instant starts with the wiring in a correct state. I do remember the other Bryan mentioning this in his writings during discovery engine testing. It's always the lil glitches that rear it's ugly lil head! So really the Apex is still a reliable platform in spite of the glitches that pop up! Good! Many happy flying hours to you and for me to enjoy watching! Blue Skies!!!

I’m curious when we’ll go hybrid on planes where the boost electric motor will also be the starter and alternator.

Impressive troubleshooting!

Great information! So much work for a reversed wire. Off this topic, and I apologize bc I did not see this in another video but are you running only car gas or do you run 100ll sometimes on xcs?

@BowenAero

10 ай бұрын

Only car gas so far, if I have to run 100LL I will use the declin additive

@CFII1974

9 ай бұрын

@@BowenAero thanks!

I'm here so early the engine isn't even started

As others have said thanks for the transparency. I don't see how your hard starting would be linked to that. The flywheel is keyed to the crank so they have to be in agreement. I would think more likely a bad Hal sensor, maybe one that work intermittently? Or with it slipping was it not turning it over fast enough?

@alanswanson5642

Жыл бұрын

I guess I should have watched the whole video before replying lol glad you found the problem

Brian really needs to add some monitoring to the ECU and show some warning if the system is seeing crank sensor errors. The idea that you flew this around for hundreds of hours without knowing that your crank/cam was having a timing issue is pretty humbling. I wonder what other errors are logged but not showing up on the screen.

@BowenAero

Жыл бұрын

He can add warnings for any data point. Over the development of this system he has added many additional features and warnings. If we felt like it was a common issue that effected the performance, then it could be added.

@akschu1

Жыл бұрын

@@BowenAero good deal. Sounds like it's improving quickly thanks to all of those that are leading the way.

Transparency is great. Is yamaha still making parts or are you buying used parts?

@BowenAero

Жыл бұрын

You can still get brand new parts.

Really

Bryan, sorry if I missed this earlier but what muffler did you end up using for this build?

@BowenAero

Жыл бұрын

KTM 1290 Adventure muffler

A old fashioned Lycoming engine with magnetos, is starting to look pretty good about now

@BowenAero

Жыл бұрын

Been there done that and I am much happier with this set up. Easy to trouble shoot, easy to fix.

@Agislife1960

Жыл бұрын

@@BowenAero An 0-320 as used on a super cub, is about as simple and rugged as you can get

@BowenAero

Жыл бұрын

@@Agislife1960 And underpowered for the weight, burns way more fuel and is very expensive new. But everything is a trade off.

@Agislife1960

Жыл бұрын

@@BowenAero Back when I lived in AK and around a bunch of Cub Drivers, I always thought somebody should've developed a turbocharged fuel injected 0-320 for the super cub

Does this mean that you will be looking at your engine logs a little more?

@BowenAero

Жыл бұрын

Not really more often, we already look at them a lot, but what you are looking for in a log changes depending on symptoms that you are trying to diagnose.

*But will the Varla go up Market St full power? Lol*