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-----Mensaje original----- De: Robert Miles <rmzalbar@hotmail.com> Para: gregorhalenda@yahoo.com <gregorhalenda@yahoo.com>; turbobike@natvideo.com <turbobike@natvideo.com> Fecha: Martes 16 de Junio de 1998 16:09 PM Asunto: Re: [turbobike] BMW question >Hi Gregor, > >I would guess that what you are having is an ignition misfire rather >than a fuel delivery problem. First look at your plugs. If you are >running lean, you will see signs of detonation on the plugs (rounded >electrodes, little black specks on the center ceramic insulator) as you >go lean under boost. Ignition misfire seems more likely from your >symptoms. It's harder to put a spark through the denser air/fuel >mixture that you get when you load up the throttle and generate high >boost, and as your RPMs climb the coils have less time to recharge >between firings, exacerbating the problem. (Rob loses a coolness point >for frivolous use of "exacerbating.") An weakening ignition system that >does fine under normal conditions can begin to experience problems when >put under such loads as a boosted air/fuel charge. You may have a weak >coil or a leak to ground through a bad plug wire. If your bike has a >breaker point system, check out the points, dwell, etc. as well. Bad >points can cause a weak spark too. Another cause might be a short in >the electrical system that grounds out intermittently when the bike is >thrust forward by acceleration, but I think weak ignition is your >answer. Hope this helps some. Good luck! > >-Rob Miles > >'73 CB750K >'85 Dodge Omni GLH Turbo > >Wish I had a turbo BIKE! > >>I have a 1985 BMW K100RS with a kit manufactured by RB Racing and sold >>by Luftmeister (both of California). It's a fairly well sorted system. >>The bike has an intercooler and nonvariable boost set at about 8lbs >>for (I'm told) about 150hp at the rear wheel. Luftmeister has gone on >>to bigger and british things and isn't very interested in helping >>someone with a 10year old kit on their bike. RB Racing is nice but >>they just aren't helpful - I'm always getting the "Let me get your >>number" routine. I bought the bike used and it has about 40,000 miles >>- at least half of it with the turbo I'm guessing as I don't know any >>history for the first 20k. >> >>The bike runs strong but as I become less fearful of the boost I'm >>finding that the engine won't run clean in first or second gear. In >>first it's a bit slow to get going (no poppet valve) and when boost >>hits at 5000 it rockets really hard but then starts to miss and cut >>out at 7000-8500 (redline). Once you shift your back in the low boost >>and it's great until 7500-8000 or so and the same thing happens again. >>In third it's great and 4th and 5th are fine as well. I believe (but >>have no way of knowing) that these bikes had different chips put in >>for the mapping of the injection (they'd have to wouldn't they?) but I >>don't know. I also don't think that this was a problem when I got the >>bike but I can't be sure as I generally didn't wind it up in first or >>second as the thought of wheelie-ing a big sport tourer over was (is) >>a bit scary. I'm starting to enjoy the power wheelies and would love >>to solve this. >> >>Could it be old injectors? Could new (different) ones help? Not enough >>fuel pressure? Clogged fuel filter? It seems to do with the _rate_ of >>acceleration rather than with rpms alone. >> >>My mechanic rode it, got it up to 160mph, out ran a cop and loved the >>bike but had no real thoughts on the matter. >> >>Ideas anyone? >> >> >> >> >>== >>Gregor Halenda >>Team Incomplet - NYC >> >>"Everyone that goes faster than you is an idiot >>and everyone that goes slower than you is a jerk" >> >> >>_________________________________________________________ >>DO YOU YAHOO!? >>Get your free @yahoo.com address at http://mail.yahoo.com >> >> > > >______________________________________________________ >Get Your Private, Free Email at http://www.hotmail.com >