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Thread: My Kilo Motor

  1. #81
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    Quote Originally Posted by Tim Kurcz View Post
    Howdy y'all.

    While on the subject of beach racing, another popular tip was to undercut the inter-cylinder seals to keep the crank from dragging. I'd like to know see the data where that actually helps. Lemme see: increased clearance = decreased crankcase pressures due to internal leakage and a somewhat undersupported crank. What part of this makes sense?


    Tim
    Someone told you part of the story, as usual. Most wont tell you something that actually increases performance. That's why it's good entertainment to read questions and replys on these forums. If someone had a big secret for performance enhancement, do you think they would tell you???

  2. #82
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    Default Beach myths

    There's no doubt that alot of engine bull%$#& floats around the pits. But I'm continually shocked at the influence thereof. I've had no fewer than half a dozen stock and mod racers demand I bore .005-.006" from the ID of Merc reed cages despite my protest. Hey they heard this from so-and-so, so it must be right!

    BTW: You're right - builders like me keep the very best tricks for themselves. The difference is I choose to communicate enough solid information to keep the racers from frustrating themselves: The objective is to have fun driving and grow the sport.

  3. #83
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    Do you stuff reed cages Tim.

  4. #84
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    Quote Originally Posted by Mark75H View Post
    Merc recommended 18:1 for all the racing motors from the V-6's on down; Hot Rods were famous for using even more ... but then again they were using the crankshaft rotary valve set up that probably needed extra oil to help seal it.
    when I first started racing most everyone I knew used Ace-O-Speed. It came in two mixtures MAB (20:1) and CFX (16:1). Mercs ran MAB while Hot Rods ran CFX and I never knew why until now.

  5. #85
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    Default Cage stuffing

    For Seagull & others,

    I've been operating Bud Parker's machine shop for 10 years after having worked with him 11 years prior. He taught me pattern making; so castings are poured for complicated shapes. I use an aviation certified welder for fabricated structures; TIG, MIG, Heliarc, and gas if needed. A local plating shop is used for zinc or electroless nickel coatings. Powder coating is also available. A CNC machine shop is used for repetitive devices.

    I personally build 8-10 race engines per year (and numerous sub-assemblies), and specialize in one-offs to take advantage of windows in the rule books. So, you betcha, I can stuff cages - provided the architecture allows.
    Last edited by Tim Kurcz; 11-14-2009 at 03:47 AM. Reason: Addition

  6. #86
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    thanks for the great posts.

    So what we can take in is;
    as much oil as you can
    avgas all year
    race gas for the one off event

    Now we just need the BTU of the oil comparison,
    who use TCW -III and who uses API-TC?
    and
    Mineral
    Blends
    Synthetic

  7. #87
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    I'm not sure it's as clearcut as that, there's a whole lot of other factors that could affect your conclusion.

    Motor design, types of bearings, cylinder wall type/condition, number & style of rings/piston design, operating rev range, piston/rings/borefit, combustion pressure/temperature & exhaust style, & possibly a few more.

    What we all need is a dyno & a lot more testing.

    Thanks for that Tim, what I was after was your views on reed cage stuffing.
    Last edited by Seagull 170; 11-14-2009 at 12:27 PM. Reason: Missed thanks

  8. #88
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    Default BTU's for various fuels/oils

    No. 6 Fuel Oil (used motor oil) = 150,000 BTUs/gallon
    No. 2 Diesel Fuel = 140,000 BTUs/gallon
    Kerosene = 135,000 BTUs/gallon
    Jet Fuel = 130,000 BTUs/gallon
    Biodiesel (B20)= 128,000 BTUs/gallon
    Gasoline (mid grade) = 125,000 BTUs/gallon
    Aviation Fuel (Avgas) = 125,000 BTUs/gallon
    Ethanol = 85,000 BTUs/gallon
    Methanol = 63,000 BTUs/gallon

    This information was obtained from a 15 minute web search. I couldn't locate anything specific to 2-stroke oil - yet. It would appear that the heavier the oil, the more BTU capacity. Here's an interesting read:

    http://www.sea-doo.net/techarticles/oil/oil.htm

  9. #89
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    Default Cage stuffing

    "Cage stuffing" is use primaily as a transition device from a single barrel carb to a wide reed cage. They are common to snowmobiles and dirt bikes where one carb per cylinder enables the opportunity to use a range of venturi/throat sizes. The objective is to improve the flow through the cage.
    Indeed they work. Is this the type of stuffer you were thinking of?
    Attached Images Attached Images  

  10. #90
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    I am not really good with percentages. But in 39 yrs.of o/b and app. 25 yrs. of h/p work I have found that Maxima 927 in generous amounts works to increase longevity and a real top end increase in the same engine setup. A direct fuel increase is imperative in these situations.
    Hal Broomes
    PS: It only works good if you keep it wound up. Very little idle.

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