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Thread: Clutch Stall

  1. #31
    4 Cycle Advanced User
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    Quote Originally Posted by flattop1 View Post
    Clutch dyno.
    Plenty around .
    Someone knows.
    The premis (of the clutch holds it at peak torque)
    Has merit although it does not address the lost amount to slippage.
    This is true, but I think all clutches have the exact same conditions that they're working with. I proved to myself that a real kart engine, K78, was faster with direct drive.
    From the desk of Al Nunley 512-630-6215
    Comments compliments criticisms and questions always welcome.
    If the data does not support the theory, get a new theory. (Al Nunley)

  2. #32
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    Quote Originally Posted by flattop1 View Post
    it does not address the lost amount to slippage.
    I think that would be the interesting part about it. You might be able to claim that a clutch can catch, hold, deliver all these awesome numbers, but how long does it take to get there and how long can it hold it without much slippage.
    Any reason why that wouldn't be addressed? Not a big enough significance to worry about?

  3. #33
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    Quote Originally Posted by alvin l nunley View Post
    This is true, but I think all clutches have the exact same conditions that they're working with. I proved to myself that a real kart engine, K78, was faster with direct drive.
    Why was it faster? It wasn't slipping or holding at max torque?

  4. #34
    Some of the reasons to use diffrent Clutch Brands depends on class and equipment difference. Some drums use the Bully type clutch sprockets both available in 35 pitch and 219. Mid summer there was considerable discussion on 219 and 35 pitch and Flash was doing some test also some discussion on clutch size and.weight and tests by Jimbo .Don't recall reading the results . Point I'm making is there are a number of reasons to use diffrent types of clutches . I'm thinking the lighter the clutch the better for the Adult Classes as long as you can get hooked up at peak torque. Remember there are two venues here Speedway and Sprint Road course . Two diffrent venues and quit possibly diffrent methods .

  5. #35
    4 Cycle Advanced User Jimbo's Avatar
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    I want to compare lap times comparing a heavy clutch to a light clutch. I have not had an opportunity to get good data. I'm not holding anything back from anyone. I just haven't been able to convince a driver that runs consistent enough laps to help me get the data.
    I will tell you that just today i did some back to back dyno testing comparing a light flywheel to a stock flywheel and after the testing was done i put the heavy flywheel back on this particular engine.

  6. #36
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    My only question, brake, or inertia dyno? I know you may have posted that somewhere that I missed. Sorry if that is the case.

    Should also post if your reasoning is based on sprint or oval racing. I know different factors apply. I also feel the weight of flywheel and clutch can be class and track dependant.
    The struggle will always remain to get all we want done in a timely manner. I applaud anyone who is getting their own hands dirty trying to solve some mystery.

  7. #37
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    Here are a few things I've found from my testing and from a few close friends.
    1. DO NOT run a large driver unless you are on a momentum track. I have been quicker on a momentum track with an 18 driver compared to a 16 driver. On same track but using a longer back straight with a very slow corner leading on to the straight the 16 driver works better. That was on same track but two different configurations, different length straights.
    2. Only difference found between 35 chain and 219 chain is that 219 chain and sprockets cost more.
    I have nothing more to offer on the subject. Best way to get faster in a kart: SEAT TIME !!

  8. #38
    Your 100 % right on the cost LOL

  9. #39
    Callen, The k78 rotary had a sprocket on the crankshaft to the rear sprocket. no clutch. push and hop in to start it, open the needles up once going and hang on. fast stuff.

  10. #40
    4 Cycle Advanced User Jimbo's Avatar
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    That makes sense, Bernie

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