Mastermind Revisits The MS261CM Type II

[MustangMike]

Looks great Scott, that is a strong little Tiger!

 

[MustangMike]

The MTronic system limits the RPMs of a saw by retarding timing at a certain RPM, so I don't think there is a need for the coil itself to be limited.

 

[Redbull661]

The MTronic system limits the RPMs of a saw by retarding timing at a certain RPM, so I don't think there is a need for the coil itself to be limited.

yep... well timing gets changed quite often.

and this stuff isn't new. it's all right here in the 441 tech manual from 2010.

 

[MustangMike]

That specifically says "by monitoring engine temperature and speed", so at a minimum, there must be a temp sensor built in there.

It is also specific that it just remembers the most recent settings, so I was wrong on that one.

 

[blsnelling]

and hence better fuel economy as fuel is used only for the burn and not the pushing, only fresh air is.

Has anyone ever tested this theory? I've seen it mentioned a lot, but never seen it tested. You're pulling the same air and fuel through the carb. You're just distributing it differently in the engine.

The MTronic system limits the RPMs of a saw by retarding timing at a certain RPM, so I don't think there is a need for the coil itself to be limited.

And with fuel. Yes, they are rev limited. You can clearly hear it in the video of your saw at WOT.

 

[blsnelling]

I was taking about the 261.

 

[Mastermind]

Lots of good info in this thread guys.

Thanks for that. A lot of is over my head, but I think in the end we can all learn more from these discussions.

 

[breese]

Big t is about an hr away and I am looking to drive out there as soon as I can....
Cannot wait to get my hands on a coil or 2.....

 

[bryanr2]

Lots of good info in this thread guys.

Thanks for that. A lot of is over my head, but I think in the end we can all learn more from these discussions.

It's all over my head, only thing I understood was the video.

 

[big t double]

Big t is about an hr away and I am looking to drive out there as soon as I can....
Cannot wait to get my hands on a coil or 2.....

Yea I probably have one or two in my box of junk 261 *s-word.

 

[big t double]

Well he's off with three coils and a carb. Dude's some sort of a mad scientist.

 

[paragonbuilder]

That specifically says "by monitoring engine temperature and speed", so at a minimum, there must be a temp sensor built in there.

It is also specific that it just remembers the most recent settings, so I was wrong on that one.

Mike is a temp sensor the only way to know engine temp?
[emoji6]

 

[tree monkey]

Has anyone ever tested this theory? I've seen it mentioned a lot, but never seen it tested. You're pulling the same air and fuel through the carb. You're just distributing it differently in the engine.


And with fuel. Yes, they are rev limited. You can clearly hear it in the video of your saw at WOT.

I was taking about the 261.

your not a very sharp stick are ya brad

 

[Lightning Performance]

the set fuel values for each model saw/coil... (sorry don't have 241 #s)

there is a good difference between fuel value of 261 and 661. So I don't think it's a viable option. We just put it on to see if it would even start. It did not.

"too low" = when the coil is considered bad and replaced

462 needs to added

Mike is a temp sensor the only way to know engine temp?
[emoji6]

I believe air temp is the quest there.

 

[Adirondackstihl]

Well he's off with three coils and a carb. Dude's some sort of a mad scientist.

 

[paragonbuilder]

462 needs to added


I believe air temp is the quest there.

There is no temp sensors on these saws at all Ken. But they still monitor it... [emoji6]

 

[breese]

Dude's some sort of a mad scientist.

LOL!!! Just like technologies I have not had my hands on yet... Besides, if I can pull this off, it will be one of my contributions to these great people... And that includes You!!!

 

[Redbull661]

can't wait to see what the mad scientist uncovers when he dissects ted err I mean the coils ted gave him.

 

[big t double]

contributions to these great people... And that includes You!!!

Nah...I'm just a jaggoff that stands behind a parts counter all day.

 

[breese]

There is no temp sensors on these saws at all Ken. But they still monitor it

We will see.... Once I get access to the CPU / ECU area of this coil, who knows what I will find.
I also have a Carb to go with this and will be looking into the Connectors that are on it for this coil...
hmmmmm......