How does Auto tune work?

[Stubby]

Electronic circuits needs power supply, both generated and stored. On a chainsaw, the needed power is magneto generated, rectified, stabilized and I suppose, stored in some kind of ackumulator.

 

Does this affect the starting behavior of a M-Tronic/AutoTune versus a traditionally equipped carburetor saw? Do these need some extra pull at start?

 

Nope same amount of pull .

[forest tink]

Sorry plus vat, less good customer discount maybe!

 

I got a brand new genuine one from the states,roughly £38 for carb,£10 post,£10 import fee,about £58 all in,put it on the saw and it runs sweet as a nut,well happy

[Garyjp]

To quote Douglas Adams "The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."

 

 

 

According to the post about the timing being controlled by magnets this says the autotune does not alter it it just reads it and alters the mixture accordingly. I personally have no problem with auto and do not wish to alter it in any way whatsoever adw and am just curious how it works and am convinced that someone will want to fiddle with it, that's just human nature like porting standard saws. If someone can get an extra .5 hp by adding a resistor or something as opposed to dismantling and grinding ports and drilling silencers and they have the ability to do it then they will probably go ahead and do it, like fitting a Power Commander on a Hayabusa, do you really need more power ? Probably not but men are just boys with more money.

 

 

Autotune does alter the advance / retard of the ignition.

The magnets are several degrees forward of where they would be on a non AT saw. The energy is discharged by the microprocessor depending on the engine speed and throttle position, behaviour, eg opened from idle to full throttle or indeed reverse.

 

When the stop switch is pressed, before the AT system stops the spark and thus stops the saw, it shuts down the fuel valve and places itself into 'start up mode'.

[Eddy_t]

Autotune does alter the advance / retard of the ignition.

The magnets are several degrees forward of where they would be on a non AT saw. The energy is discharged by the microprocessor depending on the engine speed and throttle position, behaviour, eg opened from idle to full throttle or indeed reverse.

 

When the stop switch is pressed, before the AT system stops the spark and thus stops the saw, it shuts down the fuel valve and places itself into 'start up mode'.

 

 

Not quite, the saw has a twin coil, the magnets on the throttle switch between the two coils (magnetically operated switch). This is also how each needle is powered (both do not tune simultaneously).

The autotune doesn't control the ignition, if you advance the timing, it's advanced, the saw doesn't counteract the work done to the saw. The reason the timing is more advanced than previous saws is simply because R&D at husky made it aggressive to gain more power on a heavily restricted saw.

[Eddy_t]

If you want Gary, I'll demonstrate by porting that 576 properly for you FOC of course!

[Garyjp]

If you want Gary, I'll demonstrate by porting that 576 properly for you FOC of course!

 

 

lol, thanks but will pass...a nice project when i get time! been busy all week doing R&D work on AT 😜

[Eddy_t]

lol, thanks but will pass...a nice project when i get time! been busy all week doing R&D work on AT 😜

 

 

Easier to do what I did, just google your patents, it gives you all the info and, most importantly, pictures!

[Jonesie]

Hi All

 

I'm in the middle of putting a load of clip on our website and have come across this one.

 

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