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tuning the KE10

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    #1

    tuning the KE10

    today i gave the rolla a tune, and i seem to have it running sweet as.

    got the butterflies on the carbs to open in sync, new point, rotor button etc.

    question is, when u back off, it pops an backfires out the exhaust, now what would be the most likely cause?

    Carbs out of whack? one still open on deceleration?

    air leak?

    fuck all mufflers on short exhaust system??? ( oh its loud! )

    too much overlap in cam? ( its a HUGE cam )
    a metrosexual is only a virgin homosexual.
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    #2
    leak in exhaust?
    yep

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      #3
      id say the jazz may be leaking onto the corolla when you park the two next to each other..

      its that old saying, if two live long enough together, they become alike :p





















      ...yeah yeah i know..im fired and what not...
      '67 Volkswagen Beetle 1300cc
      '09 VE SS


      Originally posted by Scrad
      You are like some sort of car rapist, Sticking things where they don't belong, and often don't fit nicely

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        #4
        just sounds like the cam to me, a large overlap will do that as unburnt fuel gets sucked down the exhaust during the said overlap.

        unless it bothers you, leave it as it is. though i suggest you get the mixtures the best they can be.

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          #5
          exhaust leak for mine.. ... even massively cammed, high comp, webered rally car engines don't backfire on trailing throttle unless air is getting in somewhere... :p..

          Rowds

          1998 MX5 - Ohlins DFV coilovers, Roll bar,15 x7.5 Konig Litespeeds, Mania Intake
          2014 Colorado LT - Oversized Whitegoods. Kid/bike/track hack/horse hauler.

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            #6
            ^ ????? marcinek

            Air leak between the exhaust manifold to head, or some really funky idle setting on one carb that is dribbling fuel in on closed throttle. but that would probably mean it doesn't idle well either. Check if a carb floods or if the fuel even weeps out of the venturi. Check the float levels as well.

            A big cam has more overlap from standard, ie at the top of the exhaust stroke the exhaust valve and the inlet valve are both open at the same time. That means that at low rpm a bit of exhaust ends up out the inlet, and/or a bit of fresh air and fuel ends up out the exhaust. Closed throttle means none of that matters, and the engine should have mixtures so weak that it barely fires anyways. Air leak in the exhaust can recombine with the small amounts of fuel and set it off in the manifold or front section of exhaust (or out the back if it is a rotary..)

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              #7
              which cam? :D
              "I'm a retarded Doctor, not a retarded Mechanic"

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