A Real Fual Power Additive For Low Conpression Engines

Discussion in 'General Questions' started by NARLEY PEDALSON, Sep 23, 2011.

  1. NARLEY PEDALSON

    NARLEY PEDALSON New Member

    HEPTANE


    Heptane is the zero mark on the octane scale from witch ever other fuel is compared from. Lower octane fuels have more BTU's or energy per gram of fuel ,so the lower the octane the higher energy made when burning in a engine. Mixing heptane in your fuel will lower your octane content and give you more power and with having a vary close oxygen content to gasoline you will not need rejetting/tuning of your carb.

    87octane = max compression ratio of 9:1 or a max of 9.66 octane per 1 ratio point, so 9.66 times 6= 58, so the best octane to run in a happy time engine would be 58 octane.

    Your mixture for the perfect fuel for your bike would be.

    800ml of 87octane gasoline
    200ml of heptane
    32.5ml of caster or high grade 2 stoke oil
     

  2. I don't take any advise from people who use the metric system....sorry.:jester:
     
  3. NARLEY PEDALSON

    NARLEY PEDALSON New Member

    0.2113376416 gallons of 87octane gasoline
    0.0528344104 gallons of heptane
    0.008453505664 gallons of caster or high grade 2 stoke oil
    1 gallon of pee to make it taste better:ack2: lol
     
  4. NARLEY PEDALSON

    NARLEY PEDALSON New Member

    you guy don't understand

    im talking a 30% power increase with out engine work
     
  5. Skyliner70cc

    Skyliner70cc Active Member

    Sorry to burst your bubble but your theory is bunk. Lower octane fuels have more BTU's per gallon.....in theory you'll get better fuel economy with lower octane fuels not more power.
     
    Last edited: Sep 24, 2011
  6. NARLEY PEDALSON

    NARLEY PEDALSON New Member

    OK i want to hear this one

    how dose a carb know what liquid is being put throw it ?
    water,gas,nitro,pee...............

    as long as the SG is around the same it won't matter so how would it know to use less gas if the gas has lower octane ?

    btu's is a measurement of energy. the more energy your engine makes the more power you get from your motor

    if you tuned a ht for better fuel economy ie 13:1 it would blow

    you want to get your ht dinoed and o2 tested so it is running at 14.7:1
     
  7. Skyliner70cc

    Skyliner70cc Active Member

    Narley,
    Please go online and buy yourself a used thermodynamics text book and engine theory/design or wait until you go to college. There are many variables besides octane and its inverse relationship to BTU that govern the output an engine is capable of producing. You cannot simply ignore those other variables that affect engine power output.

    For example, using your logic:

    Gasoline US gallon = 115,000 Btu
    Diesel Fuel US galon = 130,500 Btu/gallon

    But for some reason my normally aspirated 1.3L gas engine produces more horsepower (180HP) than my 2.8L turbo diesel engine (160hp).
     
  8. NARLEY PEDALSON

    NARLEY PEDALSON New Member

    i build racing sled engine i understand

    how ever in this case with the happy time engine mixing heptane in the fuel will greatly increase power

    its not for ever engine

    i would not use it in my 19:1 race engine
    witch run's 127octane and even that pings some time so im in time going to bore the jets to run menthol
     
  9. happycheapskate

    happycheapskate Active Member

    It's cool you guys race these things like RC cars or something. I get 100-200mpg on mine with mid grade gas and 2 cycle oil from walmart. It's fast enough to ride with traffic on main street when I go get tacos or stir fry takeout. I think I'll leave mine alone. lol.
     
  10. Barnfresh

    Barnfresh Member

    Great info Narley one! In go-kart racing a lot of times you are required to run spec fuel. Often than not the spec fuel is race gas with a much higher octane than many of the lower compression (also spec) engines need to operate at their optimum performance levels. When we were racing little Italian 50cc 2 cycle engines with 7.5:1 compression ratio is where I first started experimenting with lowering the octane of the spec 98 octane leaded race gas using n-heptane. Adding just enough to lower the octane of the race gas down to 83-84 produced the best results, consistently yielding lower lap times by as much as 1/2 a second on 3/8 mile closed course. All thermodynamics and engine theory/design aside, the transponder timing/stopwatch doesn't lie. Back then I had access to neat n-heptane right from the tap. Where are you getting your heptane?
     
  11. Are us the same guy that always says t"tastes like sheet."
    Now you are an expert on pee too.

    I tried both and neither tastes good. I won't be adding heptane to my gas anytime soon.
     
  12. NARLEY PEDALSON

    NARLEY PEDALSON New Member

    i buy brake cleaner in bulk and ie 150-200cans at a time at 300-400$ or 2$ a can anyways the gunk pro series break cleaner is pure heptane and co2
    so you flip the can over in a vice and use a can opener to let the co2 out and then you cut the can open
     
  13. Barnfresh

    Barnfresh Member

    If your talking about Gunk's M705 Pro Series Brake Cleaner I don't think it's 100% Heptane - 45-50% maybe? You may want to check out Bestine Solvent & Thinner if it's available in your area.
     
  14. why?

    Why don't you just buy it in lab grade. Its about $19 in the states or is Canada worried that you are starting a meth lab?

    http://www.carolina.com/product/phy...+k+-+o/n-heptane,+laboratory+grade,+500+ml.do
     
  15. NARLEY PEDALSON

    NARLEY PEDALSON New Member

    Last edited: Sep 26, 2011
  16. I checked the msds

    The stuff you are buying has methanol and acetone in it. Heptane is probably less than 50% . Hey, its your motor . probably no harm and it probably will lower the octane like you wish , just not how I do things. I have used both methanol as a gas dryer (35 cent cans) and acetone nail polish remover to improve mileage , but not for what you are doing. At the low concentrations you are using it , it has no ill effects , but who knows which chemical is doing what.
    Water injection of browns gas would do the same thing.
     
  17. NARLEY PEDALSON

    NARLEY PEDALSON New Member

    the brake cleaner i buy is pure and i have done burn tests in science class

    its octane rating is 0
     
  18. I found one brake cleaner

    That is pure heptane. That was ac delco. Maybe Canada has more.
    Why don't you just use diesel fuel conditioner. It will raise the cetane levels , effectively lowering the octane levels ,but I'm sure a budding Cannuck Chemist knows all about that one.
    A lot cheaper and just as effective.
     
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