Here we go again with the sky is falling!!! How do you bend a valve in a stock EFI that has a rev limiter? Missed or extra down shift, learn how to downshift. I would not like to see a modified 600cc class, too much power for the class. Burnt valves? I've raced these bikes for years, I've never seen a burnt valve. Cam timing? again, stock motors. Valve seats? A good Serdi valve job on one of these motors is less than a rebuild on a Rotax, way less. CR
Chuck Voboril <[EMAIL PROTECTED]> wrote: Bike motors Bent valves from overrevving Burnt pistons from malfunctions in EFI adjustment for a modified motor -or just an EFI malfunction from ignition noise or a defective sensor Burnt valves from airbox problems Difficult cam timing with chain and tensioners Lots of valve seats (16 to 20) to grind and valves to replace to keep motor at its peak. Tranny Missed shifts possible Bent forks Overrevvs with bent valves from shifting mafunctions Popping out of gear due to wear or just older designs (Kaw 900cc Ninja very bad) Clutch replacements Finally, The annoying dentist drill sound of a mosquito-like high revving motor. (compared to the steady music of a fine 2-stroke) :-> Chuck Chuck >From: "Jay Novak" >Reply-To: [email protected] >To: >Subject: RE: [F500] Bike motors >Date: Wed, 14 Mar 2007 22:48:24 -0400 > >I think that in general you may be right about the simplicity issue >Charlie, >particularly with respect to the very high revving 4 cyl bike engines. > >However there may be relatively simple or even simpler engine installations >with certain modern bike motors. > >Look at it this way. > >1. Fuel injection - no adjustments >2. No primary or secondary clutch maintainance >3. No constant playing with the clutchs EVER >4. Perhaps NO RADIATORS, there are a couple of modern aircooled engines >that might work. Careful duct work required though >5. No piston seizures > >Now I could be wrong about this but it is my opinion that F500 cars are >quite high maintainance race cars. All my friends in FFords or FCs are >amazed at how much time we spend at the track working on our cars. Most of >the work is just tweeking the clutches, jetting, suspension settings etc. >Endless playing with the car but still a pain. > >I suspect that a modern FI MC engine will require less maintainance between >rebuilds. However I am sure that rebuilds will cost more for a bike >engine. >We completly rebuild our F500 engine once a year just before the Runoffs >(assuming we do not stick it) so rebuilds are pretty cheap. However if you >have a bad seizure or a crank failure you are looking at an entire engine. > >When our crank failed 3 years ago at the Runoffs that cost a lot of $$$ to >repair bucause EVERYTHING in the bottom end was scrap. I think that engine >maintainance is fairly high in F500. Look at how many guys had engine >problems at Topeka, pistons, bottom ends etc. > >My suggestions are that we go VERY SLOWLY on this entire issue & make solid >judgements on how to keep F500 as low cost as it is. It may very well be >that the 500cc 2 stroke is the best answer but let's look at other >possibilities. > >In the meantime LET'S ALL RACE AS MANY NATIONALS AS POSSIBLE. > >PS: How do we get the regional guys to come to Nationals? > >Thanks ... Jay Novak > > >-----Original Message----- >From: [EMAIL PROTECTED] >[mailto:[EMAIL PROTECTED] Behalf Of >Charlie Schlismann, 71 MiDiv >Sent: Wednesday, March 14, 2007 9:57 PM >To: [email protected] >Subject: [F500] Bike motors > > >Chris, >Regardless of where one stands on this issue, I can't believe anybody on >this list is naiive enough to believe in that statement. >Good luck, >Charlie Schlismann > > > -------------- Original message ---------------------- >From: Chris Reinhardt > > Why would they not be as simple with bike motors? > >-- >No virus found in this incoming message. >Checked by AVG Free Edition. >Version: 7.5.446 / Virus Database: 268.18.11/721 - Release Date: 3/13/2007 >4:51 PM > >-- >No virus found in this outgoing message. >Checked by AVG Free Edition. >Version: 7.5.446 / Virus Database: 268.18.11/721 - Release Date: 3/13/2007 >4:51 PM --------------------------------- Don't get soaked. Take a quick peek at the forecast with theYahoo! Search weather shortcut. ________________________________ 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! ***
