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!!Replace carburator with fuel injection!!

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Old 05-09-2004, 10:56 PM
  #26  
gunny11
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Default RE: !!Replace carburator with fuel injection!!

Now your talking. A mid range needle valve, just like the old os max .61 FSR engines.

Good point/ suggestion.

Gunny
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Old 05-11-2004, 10:46 AM
  #27  
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Default RE: !!Replace carburator with fuel injection!!

Awesome: I sent you a PM. Please contact me directly at ssk320@yahoo.com regarding fuel injection for small engines.

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ORIGINAL: awesome

Gunny11 , I have already developed 2 distinct EFI systems for model use. One uses pulse width modulated needles for fuel control on Walbro series carburettors and the other uses pulse width modulated injectors and a 7 bar electric fuel pump. Both systems work flawlessly. Throttle position , RPM , crankshaft position ,manifold air pressure , exhaust gas temperature , barometric pressure and fuel pressure are some of the sensed inputs. I did this as an experiment in my spare time about a year ago. I also posted on RCU to see if there was any interest in EFI for model use. The consensus of opinion was that it would be a waste of time because no one would be prepared to pay for such a device. As such i canned any plans for a commercial device. I have the goods but i doubt anyone has the bucks! [&o] I am going to fit this system to a giant scale biplane i am building (when i decide on an engine) If you can hang out for a bit ,as i'm a notoriously slow builder , i'll post some pics of the system with some before and after EFI test data. I personally think there would be a market for such a system , but unless someone wants to bankroll a commercial item i will just keep this for my own personal use.I have worked in the engine management / software development business since 1989 and have specialised in Delco /Delphi ECU's . We have custom software which has taken years to develop for use in highly modified street driven vehicles and as such i'm no novice in this area , but i have to tell you that most peoples understanding of these systems is based upon fiction rather than fact. We see this every day from so called technical experts in the field , who have no idea as to how the software or CPU works telling us and others how it "really" works , i always get a giggle when someone makes it up as they go along! Anyhow , this thread seems rather familiar to me , so don't be too upset with any negative attitudes to new technology , just enjoy the banter.[8D] Leon
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Old 05-11-2004, 11:38 AM
  #28  
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Default RE: !!Replace carburator with fuel injection!!

ORIGINAL: Volfy
In fact, most here in this forum consider computer controlled ignition (e.g. CH elec ign) a must and scoff at clunky old magneto points ignitions. Why is that? Well, it's because newer and more sophisticated technology quite often SIMPLIFIES operations rather than complicates it.
Actually, I think most prefer the weight savings of the electronic ignitions compared to the magneto, for aerobatic type aircraft. In applications where weight is not a huge issue, like the nose of a warbird, I am not sure the preference leans away from the reliable magneto engines.
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Old 05-15-2004, 04:18 PM
  #29  
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Default RE: !!Replace carburator with fuel injection!!

I hope, I really hope some factory will makes a commercial available EFI for model airplane gassers.
I hate, I really hate Walbro carburators, they are designed for other applications except model flying gassers.
There are a lot of gasser model engine factorys in the world.
I really don't understand why there is not a factory that whant's to design a good gassers carburator instead of the terrible Walbro carbrator.
Is it not possible to design a carburator like the glow engines, they are much better then the Walbro's!!!!!!!
In my opion the glow engine manufacturer are much more proffesional, they design there own carbs.
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Old 05-15-2004, 08:08 PM
  #30  
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Default RE: !!Replace carburator with fuel injection!!

Walbros solve some very basic problems inherant in glow engine carbs.
been both places - the demand regulator feature of the Walbro is used to "fix " many glow carb problems .
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Old 05-16-2004, 02:31 AM
  #31  
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Default RE: !!Replace carburator with fuel injection!!

ORIGINAL: dick Hanson

Walbros solve some very basic problems inherant in glow engine carbs.
been both places - the demand regulator feature of the Walbro is used to "fix " many glow carb problems .

That is just what I don't like, it gives me frustrations, headache, bad sleeps instead of a good running engine.
If this device is so sensitive then I always will flying the engine in my mind instead of the airplane.
No, I am willing to pay a lot of money for a good reliable engine with a EFI then for a cheap engine with such a bad unreliable Walbro carb.
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Old 06-11-2004, 05:51 PM
  #32  
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Default RE: !!Replace carburator with fuel injection!!

dose any one make a bigger virsion of a YS injector. my YS motors are the most reliable motors I have ever had in an rc aircraft. iI would love to convert my DA 100 to glow with one. I am sick of seeing
3000.00 plus aircraft destroied because a motor got lean in a hover. the methanol wouldd give you 20% more power the motor would run much cooler and as long as there is fule in the tank it will not stop runing.
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Old 06-11-2004, 06:36 PM
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Default RE: !!Replace carburator with fuel injection!!

The problem is not the Walbro or the fuel, it's the way the user adjusts the needle valves..An engine can be converted to glow fuel by drilling all the fuel passages to twice the area used for gas..You will now require twice as much $20 a gallon fuel as you use now...
I got 600 more rpm from a G26 using glow fuel, from 9000 to 9600...
And the engine WILL stop if the glow plug goes bad from running the engine just as lean as it was run with gas...
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Old 06-12-2004, 04:15 PM
  #34  
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Default RE: !!Replace carburator with fuel injection!!

$20.00?????????!!!!!!!!!! We buy 55 Gal. drums of meth for $100.00 less than a 2 bucks a gal. that is less than Regular gas at 2.25 per gal. in chi town unless gas is still $1.00 per gal. in AZ. any race track will sell it by the gal. for less than $3.00a gal. and its the same oil so it is not the expence that is the problem. yes you consume twice the fuel. and if memory serves me right 2 stroke's are netoriuse for fouling sparkplugs so I don't buy that argument eather. I just think the ys preshureized fuel system was vary reliable. that was the only point I was trying tto make. and yes the tune up is useualy the problem but not allwase I have seen a gas moter run flawlessly right up to the point were it sucks air and gose leen in a hover.
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Old 06-12-2004, 04:40 PM
  #35  
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Default RE: !!Replace carburator with fuel injection!!

The glow fuel I was talking about is model airplane glow...Last drum of methanol I bought was $65(long ago), nitro was $40 a gallon from Johnny West..We ended up trying all different fuel mixtures, more nitro, less nitro, Klotz, Amsoil, etc...came to the conclusion that buying Red Max glow fuel by the case was easier and almost as cheap.....Not everyone can buy and store a drum of methanol and mix up fuel in the garage...
I can't remember the last time I fouled a spark plug in a gasser two stroke sport plane....
I'm sure someone will come up with FI for gassers, but most modelers won't spend the money...TKG and I both had ignition specials, he sold 2 or 3 and so did I...$$$$ rules....[8D]
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Old 06-13-2004, 12:46 PM
  #36  
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Default RE: !!Replace carburator with fuel injection!!

I was not planing on running any Nitro from my experience with big glow 2 strokes like moki's or big supertigers once the motor is bigger than 1.2 CI they prefer 0% which is just meth. and oil. on the other hand the big 4strokes can't get enough Nitro $$$$$$$. best good guy bulk price I can get is 800.00 per 55gal. and single one time purchase is 1200.00 so west was not soaking you for the nitro I also looked in to mixing my own for my YS's because I have drums laying around the shop. It is not worth it if you are going to run nitro in the mix. My YS motors run on heli mix. some time I will get out the old 0-50% hydrometer and heat up some 20-20% if the local hobby shop runs out of 35% lo vis power master.
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