Fuel Mix / Spark Plug Choice

[klickitatsacket]

After the OIL discussion I have been seriously looking into the switching to 40:1. In researching it though I have come up with a whole new set of questions 1- When going to a thicker mix ratio do you have to go to a hotter spark plug to get a more complete burn? 2- Will going to a thicker mix increase torque? 3-Is the burn rate slowed down and thus give a full stroke burn?4-How far can you take the mix before a loss in power if all things are kept equal and only the mix ratio changes? 5-Do compression rates have to be changed? 6-On a thick mix of lets say 32:1 Would preheating the fuel with a series of strategically plumbed metallic fuel lines help aid in combustion? Has any played with this and are you willing to share your observations?

 

[sedanman]

NO! You are over thinking it. In a "gallon" of 50:1 there is a gallon of fuel and 2.6 oz of fuel, when you go to 40:1 you are only adding .6 oz of oil, you do not need to re-design your saw to handle the extra oil.

 

[klickitatsacket]

I know that. I wanting to know about taking it to extremes and if advantages can be gained. I build modified saws for the woods and am concidering things in here and was thinking out loud ina public place hoping that some one would reply to this sick demented man

 

[sedanman]

Seriously, How 'thick' do you think 4oz of relatively thin oil is going to make a gallon of gasoline. I don't think anyone with possible exception of Ben Walker has put that much thought into this. Good luck with your pursuit of knowledge and welcome aboard.

 

[klickitatsacket]

Sedanman, I have been meaning to ask you about your picture of the muffler; did you do that? It looks good. Do you have any pictures of this muffler off the saw? If it is you design do you mind if I copy it?

 

[premix]

1 No
2 Yes because of ring seal. But only if air/gasoline ratio is restored to the same level.

If oil mix ratio is changed much. For example going from 50:1 to 20:1 you will lose power because of a leaner condition. (Assuming jetting was right to begin with). Unless gasoline flow is increased (fatter jetting). Because oil is now displacing more gasoline volume being ran through the same size jet. But if you increase jet size to bring air/gasoline mixture back up to obtain proper combustion temperature. Than you will end up with more power because of better ring seal.

A 2 stroke will keep making more power (although minimal from 32:1) all the way down to 14:1 - 15:1 oil ratio as long as jetting is corrected. Oil has little to do with the combustion flame front, its just along for the ride. The proper atomize gasoline / air mixture is the key to a good combustion burn.

Cooler gasoline is better than preheated gasoline.

 

[sedanman]

klickitatsacket, Here's a link to an eariler thread on the subject, by all means copy away.

http://arborist.lawnsite.com/showth...pp=15&highlight=double+barrel+shotgun+muffler

 

[GeorgeWLogger]

Great post :Eye:

 

[klickitatsacket]

Thanks, I used to work the gun shows and still have a lot of friends in there and have access to a lot of junk barrels. I love the look of it. If I put any on a modified saw I sell I will give you credit for the design. Could you send me your name so that you are credited. I have been porting the other side with a wedge deflector. This works really well but leaves a little to be desired for aesthetics

 

[LJS]

klickitatsacket......Ace Morgon was building double barrell 2100 Husky mufflers years before Sedanman made his. LJS

 

[Crofter]

Keep the weight of the pipe(s) to the minimum or it will crack out of the thin shell of the muffler. Any actual section of a gun barrel would be too heavy. They must flex together with the vibrations.

 

[klickitatsacket]

cool just as long as I can give credit due to the right man. All I know is that; it was not my idea, but I like it

 

[sedanman]

For the record I never claimed to have invented it, merely to be the first in this group to do it and shared my results with the group.

 

[bwalker]

A 2 stroke will keep making more power (although minimal from 32:1) all the way down to 14:1 - 15:1 oil ratio as long as jetting is corrected. Oil has little to do with the combustion flame front, its just along for the ride. The proper atomize gasoline / air mixture is the key to a good combustion burn.

BINGO! We got a winner.