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Inside the Stihl MS500i - SNELLERIZED Style

EngineNoO9

EngineNoO9

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Wonder if you could put a micro squirt stand alone ECU on that for kicks. I'm sure it'd run it and you'd gain full control

For $1700 though plus the ECU, I'll stick with my cheap carbs and used saws though.


Does the ECU use any kind of battery to turn it on prior to starting the saw or does it run only off of the voltage of the stator?
 
Huskvarna hotellgäst

Huskvarna hotellgäst

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The more saws that go high tech will run hotter, the heat has to go somewhere. With no way to keep it cooler longevity could be a problem. I don’t see them pushing the envelope any farther.
High tech ≠ high heat. It's because saws are still relatively low tech that this correlation remains valid.
If, and it's a big if, you could electronically control a saw engine so that it could seamlessly transition between traditional spark ignition when under low-load and spark-augmented (shock wave triggered) compression ignition when under high load, far less latent heat at full power would be produced due to the almost instantaneous combustion.
But...electric saws may come to the fore before then ;)
 
Andyshine77

Andyshine77

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Wonder if you could put a micro squirt stand alone ECU on that for kicks. I'm sure it'd run it and you'd gain full control

For $1700 though plus the ECU, I'll stick with my cheap carbs and used saws though.


Does the ECU use any kind of battery to turn it on prior to starting the saw or does it run only off of the voltage of the stator?

I'm not an electronic technician or engineer, but I would guess the capacitors store some energy, ran off the flywheel stator.
 
Andyshine77

Andyshine77

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High tech ≠ high heat. It's because saws are still relatively low tech that this correlation remains valid.
If, and it's a big if, you could electronically control a saw engine so that it could seamlessly transition between traditional spark ignition when under low-load and spark-augmented (shock wave triggered) compression ignition when under high load, far less latent heat at full power would be produced due to the almost instantaneous combustion.
But...electric saws may come to the fore before then ;)
Exactly. Saws do not make enough power stock or woods ported for heat to be an issue, you see that on saws with pipes and saws ran on alcohol and other fuels. Water cooling will never happen on a saw, way too much added weight and bulk.
 
EngineNoO9

EngineNoO9

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I'm not an electronic technician your engineer, but I would guess the capacitors store some energy, ran off the flywheel stator.

Well I'm not sure how the auto tune ones operate either. Assume there's some basic battery for the ECU that keeps things stores but it's powered off of the saws motor once running. Never seen one up close to study it.
 
Andyshine77

Andyshine77

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Well I'm not sure how the auto tune ones operate either. Assume there's some basic battery for the ECU that keeps things stores but it's powered off of the saws motor once running. Never seen one up close to study it.
Everything is sealed/potted in the coil, and the module on the carb. It's been decades since I worked for an electrical engineer. I think everything is stored on a rewritable chip, don't know if a battery is nessairy wonce the perimeters are set, my guess is not. But I really don't know.
 
epicklein22

epicklein22

One tree at a time
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I bought a ms500i earlier this summer and use it doing tree work ~3 days a week. It’s been an absolute tank. Not one single hiccup from it. Lightweight, instant throttle response, good power and it handles very nicely. Starts easily when cold and then it’s one pull once it’s hot. Stays primed for a long time. Filtration has been good too.
 
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