Strato chainsaw good & bad

[CoreyB]

To me where I think they went backwards on is, in the case of husqvarna went from a quad port design to a dual port transfer and dual fresh air ports. If they could go back and have quads fuel mix transfers and dual fresh charge transfers there could be lots of gains had. but that's just my uninformed opinion.

I wonder if that is why Dolmar went with the reeds? Or does that even make a difference on the transfers?

 

[idiotwithasaw]

I just got my first makita the other day, so I'm not real familiar with them. When you say reeds what do you mean?

 

[CoreyB]

I just got my first makita the other day, so I'm not real familiar with them. When you say reeds what do you mean?

I am probably the worst person to try and answer. But the 6100 is their only strato, and the clean air charge is handled by reeds vs piston porting. Hopefully someone like @Miller Mod Saws can explain it better.

 

[Miller Mod Saws]

I am probably the worst person to try and answer. But the 6100 is their only strato, and the clean air charge is handled by reeds vs piston porting. Hopefully someone like @Miller Mod Saws can explain it better.

I'll try to make sense. Lol. One of the biggest downs to the Stratos is the piston port. This adds weight to the piston. If you read a lot they say it tends to take out your crank bearings faster pushing the extra weight around. I won't confirm or deny this. The 6100 uses a reed system which essentially is just a peice of plastic over the strato holes. When the case pressure is low it draws fresh air straight into the transfers as your piston travels down and shuts the intake the building of case pressure shuts reeds and pushes the mix threw the transfers. So right ahead of the mix is that fresh air wall. Allowing the piston to be light like the non strato saws. Hope that makes sense.

 

[Simondo]

Dolmar 6100 intake and piston set up...see the reeds.

 

[bwalker]

I think that helps me wrap my head around it better. Thanks.

Keep thinking because that's far from correct.
In a properly running two cycle motor premix in droplet form goes through the carb and enters the hot motor where the fuel evaporates dropping the oil out of suspension. This oil then coats the internal parts while the evaporated fuel goes into the combustion chamber here it is combusted. Because of this oil dropping out of suspension in the crank case it matters not how much charge is lost out the exhaust of a strato or non strato engine as it has no effect on internal lubrication. The simple fact is a strato engine uses much less fuel and hence has less oil moving through the motor.
The other thing is in regards to CAT equipped saws. They will never be able to have the fuel economy of a strato saw as they don't control the amount of unburnt charge in the exhaust at all.

 

[T.Roller]

Mr. Knowit all is here to correct us all.

 

[wcorey]

I wonder if that is why Dolmar went with the reeds? Or does that even make a difference on the transfers?

Another reason for the reeds besides the piston weight issue is that Husqvarna owns the patent for piston port strato...

 

[Miller Mod Saws]

Another reason for the reeds besides the piston weight issue is that Husqvarna owns the patent for piston port strato...

Stihl has piston ports as well!

 

[CoreyB]

Another reason for the reeds besides the piston weight issue is that Husqvarna owns the patent for piston port strato...

Could it be that Dolmar did it this way to get the characteristics out of the 6100 they do? It really seems very effective not like a work around. But I don't want to get into a brand x does it better. I think it is interesting to get a better understanding of how it works on our chainsaws. Like the effects of power, fuel economy, exhaust, ect

 

[wcorey]

Stihl has piston ports as well!

Afaik licenced from Husqvarna... who may have aquired Redmax primarily to obtain rights to this particular technology...

 

[Miller Mod Saws]

Afaik licenced from Husqvarna... who may have aquired Redmax primarily to obtain rights to this particular technology...

Well idk about all that. Lol. I just know the Stratos run threw the piston on a stihl as well.

 

[bwalker]

Mr. Knowit all is here to correct us all.

Don't you ever get sick of the same stupidity repeated over and over?

 

[bwalker]

Could it be that Dolmar did it this way to get the characteristics out of the 6100 they do? It really seems very effective not like a work around. But I don't want to get into a brand x does it better. I think it is interesting to get a better understanding of how it works on our chainsaws. Like the effects of power, fuel economy, exhaust, ect

In this case brand X does do it better. Husky via its purxhase of Redmax has the best and most mature technology. It's also true that Stihl licenses some tech from Husky.

 

[T.Roller]

Don't you ever get sick of the same stupidity repeated over and over?

I was giving you a hard time no reason to be a keyboard cowboy