Blocking off the Oil Injector 582

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Posted

My experience has been that there are good and bad folks in every profession. Judging any one of them as great, or horrible, rarely yield results with high accuracy.

 

That being said, I wish engineering school included designing, assembling and maintaining one's own creation as part of their final exam. Of course, I also wish every technician would be evaluated on their diagnostic skills. Too many 'parts changers' out there that only know the shotgun approach to repairs.

 

Just my two one hundredths of a dollar.

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Posted

Great thread guys! I just recently started flying a powered parachute that has injection. I found myself watching the oil tank like a hawk. It also makes me really nervous when it doesn't smoke when it's cold. Neither of my Avid's have injection but I'm tempted to add it back on to my MK4 that has the Poly tanks because there's really no way to mix oil in the tanks while X-country like I do with my B model. Granted I only do that a couple times a year so I'm also just thinking about getting a collapsible 5 gallon jug and mixing and pouring like usual. 

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Posted

Great thread guys! I just recently started flying a powered parachute that has injection. I found myself watching the oil tank like a hawk. It also makes me really nervous when it doesn't smoke when it's cold. Neither of my Avid's have injection but I'm tempted to add it back on to my MK4 that has the Poly tanks because there's really no way to mix oil in the tanks while X-country like I do with my B model. Granted I only do that a couple times a year so I'm also just thinking about getting a collapsible 5 gallon jug and mixing and pouring like usual. 

I still have the complete oil injection kit from my mkIV . Has the pump and gigantic oil tank . 

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Posted

Nope just the system itself . All I did with mine was remove the tank ,cable and hoses . I left my injection in because of it being a pain in the ass because of the position.

I too removed the oil injection, lines, pump and gear.

fabricated a block off plate. took about 2 hours, but I'm slow.

rotax rick suggested to remove everything.

Jim

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Posted

So how many welders, machinists, mechanics etc. would it take to design something like a Boeing 787 and make it successful economically?  Build it, heck yeah, but design is a completely different endeavor.  Hey, as an engineer myself I have also seen my share of dumb engineers, and face it: we all make mistakes from time to time.  But I also have met and worked with true geniuses and have been awed with their intellectual prowess.  People are people, however, Nlappos makes a good point.  There are instances in which only detailed understanding of the physics, and an ability to accurately model same mathematically are absolutely critical for a design concept to be successful.  It's easy to nip at our heels, but can you really claim to walk in our shoes?  For relatively simple things, sure, no stress, thermodynamic, heat transfer or aerodynamic analyses required.  By the way, the engineering specialist on challenger said don't fly; it was the politicians who overrode him.  

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Posted

All kinds of engines running without oil pumps. I removed mine years ago. Unbolt the pump from the recoil and take the nylon gear off and you are good to go. Doesn't take a rocket scientist to premix fuel.  It was designed to work either way. Why then would one take a 582 and make it into a 670 ? Far more risks than premixing fuel I think, but then I am not a engineer.

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Posted

Is there a drive gear or shaft that gets removed?

Yes

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Posted

The early oil injection pumps on snow machines in Alaska had a metal drive gear and those would wear out and quit turning. YOu only found out after the engine seized!!

Rotax uses a nylon drive gear and there has been no further problems....I too removed my oil injection system for this reason..

There are already too many single point failure systems on these Avids and Kitfoxes....IF you loose your coolant, stick a fork in it, because you are done!! Rotax 503 dont have this issue..dont have the power the 582 has either....

582 has rotary drive shaft and if any part of that fails guess what? your done again!! stick another fork in it..

 

If the cable to the oil pump breaks you wont figure it out til it seizes....Hell it might seize anyway if you dont warm it up enough.....

 

If a person was doing a lot of cross countries, oil injection would be nice because when you land, you never really know how much fuel is left in the tank so you dont really know how much to mix and dump in unless you take collapsible fuel tank.

I am a firm believer in removing all the "single point failure" systems you can or add redundancy to the plane to make it more robust and reliable

I would venture to say that most use these kitfoxs and avids for local flying and so long cross countries are not the normal flight plan.

The RV in the back corner of the hangar is for that!!

 

 

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Posted

So maybe those Rotax engineers used a plastic gear to drive the oil injection pump in anticipation of users failing to remove it when reverting to premix mode.  When the oil injection's piston pump eventually seizes due to lack of lubrication, the plastic gear acts as a mechanical fuse, failing, but allowing the engine to continue to run!  Smart, eh?

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