MS441 R C-M M-Tronic Review and Mods

[Anthony_Va.]

I'm simply amazed at how many people make that mistake. I work at a service/gas station. Over the years, I've heard it so many times, I just shake my head.

I agree! And people just keep refusing to believe that.

 

[mdavlee]

Get that old muffler modded and then later on I can mod the new muffler if I want to or just run that old one. We need to see the husky out cutting the stihl.

 

[blsnelling]

Get that old muffler modded and then later on I can mod the new muffler if I want to or just run that old one. We need to see the husky out cutting the stihl.

I'm all for a fair showdown. I've always tried to be unbiased in my testing, letting the saws stand on their own. Thats why a Stihl guy like me owns a couple Huskies.

 

[j.williams]

brad what are your plans for the 441? i see u havnt added it to your sig yet. maybe auction it off too, for another charity.

 

[blsnelling]

brad what are your plans for the 441? i see u havnt added it to your sig yet. maybe auction it off too, for another charity.

It will be modded and then likely sold later this fall.

 

[Wild Knight]

I addressed the octane issue in the other thread, but I'll reiterate the fact octane has nothing to do with power. Octane is simply the fuels resistance to knock, without the proper compression ratio you will loose some power. A saw will need over 200 psi to require anything other than normal pump fuel.

A lot of the time the use of AV gas or others has nothing to do with octane need, but is desired because of the additives package for storage life once mixed and sitting in your garage. It is also nice to know that if your ported saw with a pop-up leans out in the cut that you are using a fuel that will protect to higher temps and pressures. Just cheap insurance for an expensive saw IMO.

 

[MCW]

A lot of the time the use of AV gas or others has nothing to do with octane need, but is desired because of the additives package for storage life once mixed and sitting in your garage. It is also nice to know that if your ported saw with a pop-up leans out in the cut that you are using a fuel that will protect to higher temps and pressures. Just cheap insurance for an expensive saw IMO.

I agree. I use 98 RON Premium Unleaded in all my saws as it is not only a higher quality fuel, but provides a buffer in the event of any lean out scenario. I've mentioned this before on AS regarding extra protection offered by higher octane fuel, not necessarily higher power.

 

[blsnelling]

How does higher octane fuel give protection against a lean condition, assuming it's tuned properly for either fuel?

 

[CR500]

I think the higher the octane the less volitile it is right? 87 has a higher chance of pre dentnating than 93 octane right?

 

[FATGUY]

IIRC testing was done at Eric Jeeper's GTG a couple years back and cut times were the same regardless of the fuel used.

 

[blsnelling]

I think the higher the octane the less volitile it is right? 87 has a higher chance of pre dentnating than 93 octane right?

But if you're not pre-detonating with 87 octane, how can 110 octane provide any kind of protection against a lean seizure?

 

[slangegger]

But if you're not pre-detonating with 87 octane, how can 110 octane provide any kind of protection against a lean seizure?

Brad,

I dont think he is reffering to damage caused by a lean seizure. I think he is talking about damage cause by pre-det.

 

[blsnelling]

Brad,

I dont think he is reffering to damage caused by a lean seizure. I think he is talking about damage cause by pre-det.

But thats not an issue with a work saw. My 440/460 has 195PSI compression and turns >15K RPMs, and it's totally fine on pump gas.

 

[slangegger]

I agree. I believe the thinking is, as the gas sits in storage, some octane is lost. It seems people feel that if they have the extra "buffer" of added octane, and a fuel that has a better shelf life, it adds a saftey factor.

 

[Tzed250]

Once again, there is no such thing as pre- detonation. It is either pre-ignition or detonation. Two completely different things.

 

[blsnelling]

Once again, there is no such thing as pre- detonation. It is either pre-ignition or detonation. Two completely different things.

But when it pre-ignites it also pre-detonates

 

[Trx250r180]

if theres no detonation no need for higher octane fuel

 

[Hoytster]

But when it pre-ignites it also pre-detonates

Engine Basics: Detonation and Pre-Ignition: Streetrod Stuff


Detonation Detonation is the spontaneous combustion of the end-gas (remaining fuel/air mixture) in the chamber. It always occurs after normal combustion is initiated by the spark plug. The initial combustion at the spark plug is followed by a normal combustion burn. For some reason, likely heat and pressure, the end gas in the chamber spontaneously combusts. The key point here is that detonation occurs after you have initiated the normal combustion with the spark plug.

Pre-ignition Pre-ignition is defined as the ignition of the mixture prior to the spark plug firing. Anytime something causes the mixture in the chamber to ignite prior to the spark plug event it is classified as pre-ignition. The two are completely different and abnormal phenomenon.

 

[Tzed250]

But when it pre-ignites it also pre-detonates

Ignition and detonation are mutually exclusive of each other. Ignition in an internal combustion engine is desireable as long as it is timed correctly. Detonation is never desirable, therefore it can't be premature. I don't know though, maybe you get backed up and call it pre-constipation.

 

[Stihlman441]

I agree. I believe the thinking is, as the gas sits in storage, some octane is lost. It seems people feel that if they have the extra "buffer" of added octane, and a fuel that has a better shelf life, it adds a saftey factor.[/QUOTE]

This is the way i see it and allways use 95 or 98 Octane.
When you get it how old is it ?
When you add oil you loose Octane
When you undo the fuel cotainer lid and it goes shissss you loose Octane
The longer you store it you loose Octane

Depend on where you live how the Octane is rated ?

http://en.wikipedia.org/wiki/Octane_rating