different way to change fuel/air mix?

Discussion in 'Motorized Bicycle General Discussion' started by Prasinos, Dec 7, 2009.

  1. Prasinos

    Prasinos New Member

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    I know ethanol has a far higher octane rating as gasoline, i want to say its around 115.

    I thought there was someone at the death race that used e85.

    I lost the jet because like an idiot i put the old one on top of my engine and drove away.

    The reason i thought that e85 would be richer is because i believe Norm said to run on alchohol you have to drill your jet way smaller.

    by norman
    No! to run methanol you go way bigger in the hole size and across the board needle size and setting.
     
    #21 Prasinos, Dec 10, 2009
    Last edited by a moderator: Dec 14, 2009
  2. camlifter

    camlifter Active Member

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    e85 is 85% ethanol, the 85 refers to the ethanol content not the octane, e85 is 105 octane, thats why the turbo guys run it, you just need to tune for the leaner properties, to run on e85 you generally will need to go up 5 jet sizes, for methanol 10 sizes, thats a rule of thumb and you need to dial it in with spark plug color. i run an e85 mix in my srt4 works great for keeping it in high octane mode.
     
  3. george_n_texas

    george_n_texas New Member

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    I did exactly the same thing doin a brake job on a coworker's car only it was a Buliva railroad aprooved watch I had just paid off and had to have to be a transit bus driver...needless to say I lost money on that brake job.
     
  4. Prasinos

    Prasinos New Member

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    so ethanol would run leaner, is there anything that would run richer?
     
  5. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    No.
    ................
     
  6. Prasinos

    Prasinos New Member

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    how about methyl alcohol, it has a lower viscosity than ethanol

    or if one dared, acetone?
     
  7. tyrslider

    tyrslider New Member

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    Thanks for clarification on e85 admitedly not familiar w/ it.
     
  8. tyrslider

    tyrslider New Member

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    I heard moth balls can give you a boost. don't know whether they lean or richen, or if they work for that matter.
     
  9. camlifter

    camlifter Active Member

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    you can add xylean to gas to raise the octane, to richen a fuel mix the fuel your using would need to have a lighter specific gravity than gasoline. that would cause more fuel to flow through the same size jet making it richer, i don't know what that fuel would be, if you want to really play with your fuel go to this site, they have everything you need.
    https://pricechemical.com/
     
  10. xlite

    xlite New Member

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    LOL! I never did that! I specially didn't do it with my Garmin Rhino GPS on the back rack. And I didn't do it again with my best 10mm wrench a week later. :)

    You can make your jet leaner by putting tiny pieces of wire from stranded cable in the hole. At least til the new jet comes in. Would be much better to order a set of tiny drills than another jet. 3 minutes with a pin vise and bic lighter.
     
  11. Prasinos

    Prasinos New Member

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    idk i bought some tiny drill bits and my drill press broke all of them, they were cheap but the press just idint true enough, is there something im doing wrong?
     
  12. tyrslider

    tyrslider New Member

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    Just use a var. speed hand drill and hold the jet in your hand.
     
  13. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    Use a pin vise for those drill bits.
     
    #33 Bikeguy Joe, Dec 13, 2009
    Last edited: Dec 13, 2009
  14. xlite

    xlite New Member

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    In fact the easiest way to adjust mix is to bend the prongs in the float bowl.
     
  15. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

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    I'm sorry bro, but that's not good advice!!!
    Adjust the mixture the right way... RE-JET!
     
  16. xlite

    xlite New Member

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    Is there any reasoning behind that statement?

    Regardless of whether one believes adjusting float level is "virtuous" or not it is certainly easier than re-jetting.
     
  17. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    It does work. If you are close with the jet, you can fine tune your mixture with the float settings.
     
  18. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

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    My brother once blew up the engine in his truck by messing with the float level... (too lean!)

    There is supposed to be a adequate amount of fuel in the float bowl to feed enough fuel up through the jet tube in all conditions.
    The jet is what measures the fuel into the airstream, starving the the jet of gas is not the right way to lean out the mixture!

    When you figure in the fact that the carb will be tilted at different levels as you go up & down hills & race around corners, (dropping the fuel level even more), you don't want it ever getting too lean & hurting the engine.

    Why is it so hard to just jet it right in the first place & be done with it??
     
  19. xlite

    xlite New Member

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    You are just as like to screw up the mixture with a jet as playing with the float. More so if Joe is right. And I don't think it's as easy to blow up one of these engine as many think. I put 300 miles on a trip this summer with a half size jet and white/grey plug. Great gas mileage and no overheating or seizing. Out af several dozen motors I've never had one seize. Even with 50:1 marine oil. These are not truck motors.

    I commend you on your abilty to "jet it right in the first place & be done with it". Most are not so lucky. And if you think ordering jets or playing with solder and a pin vice are easier then feel free.

    I wonder why so many resist this easy way to adjust mixture. Even Barely seems to have come around. :)
     
  20. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    I will add that the float adjustment is as touchy as many other things and a heavy hand will do more harm than good. With the "float method" you are adjusting the overall level tipped, not tipped, ect. This changes the atmospheric pressure in the float chamber and changes the amount of fuel dispresed through the given size jet.

    I believe Mr. xlite has the best explanation as to why and how adjusting the overall float bowl level works....Mr. xlite
     

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