Mixture Control..... Glow to gas - RCCanada - Canada Radio Controlled Hobby Forum
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Old 01-14-2022, 08:23 AM   #1
Cat 1
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Mixture Control..... Glow to gas


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Hey all,

I have stumbled across this neat project by a couple of modellers and I am going to give it a try. It involves using a Stihl chainsaw modulating solenoid from their newer electronically controlled carbs to "modulate" the fuel flow for our gas powered model engines - this allows for precise mixture curve tuning from the transmitter using a simple circuit and very few parts...

A small MPU reads a RC signal from separate "curve" channel slaved to the throttle output - it converts it to a PWM output to the solenoid at about 30HZ - this can vary the fuel flow through the solenoid from full flow to shut off. By setting the "curve" on the transmitter the fuel curve supplied to the engine is modulated.

In most cases this will allow you to convert using the original glow carb and then allow total control of the mixture curve - it even has ambient temp and pressure correction.

Parts have been ordered and will keep you all posted..

here is a link and I will be adding other info as I dig it up..

https://github.com/raleighcopter/mix...ontroller/wiki

Last edited by Cat 1; 01-14-2022 at 08:44 AM.
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Old 01-14-2022, 08:35 AM   #2
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Re: Mixture Control..... Glow to gas

here is a quick video showing the results...
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Old 01-14-2022, 11:25 AM   #3
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Sorry I kinda mis Understand, but I hope you’re nor buying a 500i just to get some parts for an engine!!!
They are building the same type of controller that Sthil is using?
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Old 01-14-2022, 05:20 PM   #4
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Re: Mixture Control..... Glow to gas

No Nathan. Just need the small solenoid valve used on the Stihl saws. About 40 bucks. It gets put in a simple small housing and goes inline in the fuel feed line…added picture of solenoid in housing
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Last edited by Cat 1; 01-14-2022 at 05:33 PM.
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Old 01-14-2022, 05:32 PM   #5
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Re: Mixture Control..... Glow to gas

So, assuming this runs off the same voltage as your flight pack?
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Old 01-14-2022, 05:34 PM   #6
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Re: Mixture Control..... Glow to gas

Yep. Up to 6 volts - higher and you have to use a regulator to supply the mpu- up to 2s LiFe it just feeds off the connection to the receiver
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Old 01-17-2022, 08:57 AM   #7
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Re: Mixture Control..... Glow to gas

I’ve seen Bert’s work in this before, it seems like a neat solution. Normally I’m keen to play with microcontrollers and electronics, however, the “KISS” side of me has steered clear of this one….so far.

Up till now, my gas conversions have been happy with the stock glow carb after some needle adjustment. Haven’t even resorted to slowing the throttle channel; though I do purposefully use older/cheaper servos that are slower to avoid banging the throttle open and blowing the mixture ratio. Overall, throttle response is still good, maybe not as great as a top notch tuned walbro carb, but better than most glow engine spool ups.

Where did you end up getting the solenoid Chris? And how much was it?
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Old 01-18-2022, 09:30 PM   #8
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Re: Mixture Control..... Glow to gas

David, Got the solenoid from a Canadian Ebay seller - $40 USD .. Can be had cheaper from Bert if you can wait for it.. The rest of the "kit" is reasonable.. About $25 for the components. most parts are almost here so I hope to have a workable one soon to test.
Im going to set it up on a big Supertigre 2 stroke to try it - They are usually an easy conversion but it will give me a chance to play.. and see how flexible it is.

Chris
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