Chuck, they have to have 2 different triggers to fire. I assume they are 180 motors and not twingles, so they fire 2x every crank rev, or every TDC and BDC for each piston. If they were twingles, they would both rotate in sync with each other, kinda like a big single and fire once per crank rev. So there has to be 2 different pickups on the motor, one @ zero degrees, (for example purpose) and another 180 out from that. One pickup will fire one cylinder, and the other the other cylinder, that's where I would look first. Is there timing marks on the flywheel? Bring the bad cylinder up to TDC and and roll it counter clockwise till it lines up with the pickup coil, and bingo, that's your sucker!!! CR
Chuck Voboril <[EMAIL PROTECTED]> wrote: This is a simple 2 cylinder wasted spark system and both plugs always fire at once. The fixed (stator) ignitor coil is a single winding if I recall so one cylinder cannot have different spark timing from the electrical end of things. Could look at the rotating magnet end of things in the flywheel, I suppose. Could have a bit of metal stuck in there extending one magnet's field forward. The only other things that can make one side detonate and not the other is unique leaner mixture, different squish angle in head, more compression or more actual advance from the crank throws having shifted from each other. I have heard of the last one happening in a very few rare cases. Chuck >From: Chris Reinhardt >Reply-To: [email protected] >To: [email protected] >Subject: Re: [F500] Help I don't know what to do anymore >Date: Sun, 24 Sep 2006 14:45:14 -0700 (PDT) > > John, I'm very familiar with 2 strokes and ignitions, not very much so >with the F500 plants, but all applies, and I'm sure I will be corrected, >but... > How does that ignition layout, is there anything that's separate from >one cylinder to the other? I'm thinking more like a bad CDI unit or stator >coil... > > CR > >John Vriesinga wrote: > > John, if you're melting electrodes, I would sugest ignition woes... > >Are you thinking there is a spike in the current? What should I change? > >JV > Get on board. You're invited to try the new Yahoo! Mail. ________________________________ FormulaCar Magazine - A Proud Supporter of Formula 500 The Official Publication of Junior Formula Car Racing Subscribe Today! www.formulacarmag.com or 519-624-2003 _________________________________ _______________________________________________ F500 mailing list - [email protected] To unsubscribe or change options please visit: http://f500.org/mailman/listinfo/f500 *** Please, DO NOT send unsubscribe requests to the mailing list! ***
