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Flywheel

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    #1

    Flywheel

    - What does a standard CB-7 flywheel weigh? (I heard 20 tossed around?)

    - Reliability: Honda stuff is reliable/indestructible - are aftermarket flywheels the same?

    - With a lighter flywheel, is the necessary driving adjustment (to take off without stalling) to rev the engine a little higher and to pop the clutch quicker? If so, how does this affect clutch wear?
    (My dad taught me to be very smooth with a clutch, this would be a tough adjustment for me)

    -----------------------------------------------------------------------

    After reading another flywheel thread, I think I know why I stalled a friend's BMW 325i a few times... I'm guessing the Bimmer flywheel is lighter than my Honda's, and the car is heavier... so when I did the same revs and medium clutch letout speed that I'd use with my stock CB-7, I'd choke with the BMW, and I always thought that was kinda weird... obviously her car had more horses, why would it stall?... now I think I understand. My understanding up until 15 minutes ago was that the car forced me to drive more aggressively, I just thought that was something set up that way to bring out the macho in BMW drivers. Now I (think I) know it's an actual performance issue, and that makes much more sense

    -----------------------------------------------------------------------

    If you were driving two cars side by side at 70 mph with different weight flywheels, and both let off the gas at the same time, would the heavier flywheel car "coast" farther than the lighter?

    If so, it sounds counterintuitive, but I think my gas mileage would go down with a lighter flywheel... right now I try to watch traffic flow several cars ahead, and predict speeding up and slowing down to even out changes in speed more than drivers around me... using the energy of the coast is a big part of that, I'm thinking I'd have to keep my foot ON the gas a little more in situations where I can totally let off the gas now. Do I have this backwards? With weird paradoxical questions like this, it's easy to give bad information... so please don't answer unless you're positive
    Last edited by do2mind; 12-01-2006, 04:35 AM.
    Tags: None
    #2
    Some aftermarket flywheels are reliable and last a while, while some can explode (in extreme case). Depends on the company making the flywheel (materials used/design). But the majority of them are good.

    Yes, you would need to rev it higher to not stall since there is less rotational mass and the engine rev changes to drop/increase faster. I am not sure on clutch life because that will vary from someone who knows how to drive with a lighter flywheel vs someone who doesn't. It will get some use to but I'm sure you'll adjust.

    The 3 Series clutch should be in similar weight territory or even heavier. The way it engages differently is because the transmission for both car are different. The clutch used in the BMW are Dual Mass so that also contributes in the difference in shift/drive.

    Dual Mass Link

    Dual Mass vs Single Mass

    What do you mean don't answer unless its positive? I do not quite understand.

    Comment

      #3
      Hey, B18... Thanks for the info.

      What I was trying to say was "please don't guess, only answer if you know".

      You seem to know what you're talking about, for example knowing that the BMW has a dual mass flywheel.

      I'm guessing that with my driving habits, my heavy stock flywheel saves me gas in situations where I can slow down by coasting. But as I think about it more, I'm wondering if the "loss" from pushing that heavier flywheel on the subsequent speed-up is greater than the savings from the coasting slow-down? I'll bet a race-car driver knows the answer, and knows some tricks to make the most out of a gallon of gas under changing speeds.
      Last edited by do2mind; 12-02-2006, 12:15 PM.

      Comment

        #4
        Originally posted by do2mind
        Hey, B18... Thanks for the info.

        What I was trying to say was "please don't guess, only answer if you know".

        You seem to know what you're talking about, for example knowing that the BMW has a dual mass flywheel.

        I'm guessing that with my driving habits, my heavy stock flywheel saves me gas in situations where I can slow down by coasting. But as I think about it more, I'm wondering if the "loss" from pushing that heavier flywheel on the subsequent speed-up is greater than the savings from the coasting slow-down? I'll bet a race-car driver knows the answer, and knows some tricks to make the most out of a gallon of gas under changing speeds.
        No problem. I know a few things about the E46, thats because I have one for my DD I was thinking about the same thing a while ago between the shifting difference for a 325 and an Integra.

        If coasting I think the less friction you have the lighter the load which in turns gives better gas milage. Thats my guess. Race car driver care about speed and they use lots of gas lol.

        Comment

          #5
          I use and ACT streetlite flywheel. I think its around 13lbs. Its one piece. And made of chromoly...much stronger then most others... I cant say i can notice a difference in revs due to it being an auto before, but it revs fast as hell... One thing it did change was i have to rev to about 3k before letting out my clutch... Dont go too lite with your flywheel weight if you plan to dragrace...
          12.5 at 114.6mph 15psi
          11.7 and 11.5 20.5psi
          F22a1
          60-1 td06h turbo
          Darton mid sleeves
          85.5 wiseco 8.8:1 forged pistons
          Crower pro billet rods
          Custom ported head.
          KMS valves
          F23 headgasket
          ARP H23 headstuds
          H23 upper intake manifold
          F22a6 lower intake manifold
          Intake manifold is gutted
          AEM EMS 1040u
          FIC 850cc injectors
          Walbro 255 pump
          H23 manual trans
          Prelude shifter assembly
          Forbidden short throw
          Nitrous Express Kit installed, never used on this motor

          Comment

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