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From: Albrecht via MotorcycleKB.com on 14 Jun 2007 20:18 Stephen! wrote: > So not only are they terribly under powered, they're also horrible >inefficient... Seems if there's that much burnable material left in the >exhaust you'd want to burn it off in the power stroke. An internal combustion engine only converts 30% of the energy in the fuel into mechanical power at best. But the reason motorcycle engines have traditionally used a coil that fires one useful spark and one waste spark is to simplify the ignition sytem by reducing the number of ignition point sets or pulser coils and reduce the number of solid state components in the ignition control unit. If the engineers want to burn off excess hydrocarbons in the exhaust system, they can use a catalytic converter or inject excess air in an afterburner. -- Message posted via MotorcycleKB.com http://www.motorcyclekb.com/Uwe/Forums.aspx/bike/200706/1
From: Albrecht via MotorcycleKB.com on 14 Jun 2007 21:12 Rayvan wrote: >Close, but wrong. A piston fires the next piston fires at 315 degrees >there is a 405 degree gap a piston fires the next piston fires at 315 >degrees there is a 405 degree gap and so on... There are two ways to fire a V-twin. One way is just as you said. But dirt trackers have been running their V-Twins as "big bang" engines for years. They get better traction. Some people confuse the concept by calling the re-cammed engine a "twingle" but it isn't a twingle in the sense that both pistons come to TDC and fire at the same time. Tuners re-install the cams so the cylinders fire 45 degrees apart (Harley XR750) or 90 degrees apart (Suzuki TL1000). The sound of a pack of big bang engines going by the gransdtand is awesome. -- Message posted via MotorcycleKB.com http://www.motorcyclekb.com/Uwe/Forums.aspx/bike/200706/1
From: Road Glidin' Don on 14 Jun 2007 21:17 On Thu, 14 Jun 2007 18:50:40 -0500, "Stephen!" <NO(a)spam.com> wrote: >Road Glidin' Don <d.langkd(a)gmail.com> wrote in >news:1181862319.074352.322440(a)j4g2000prf.googlegroups.com: > >> I can read too *and* I've owned non-Harleys *and* Harleys *and* can >> work on both. You're the typical clown who comes in here, thinking he >> knows so much, but has no actual experience of what he's talking >> about. > >(Hey everybody, watch this) > <snip bait> Notice how restrained I was? My lip hurts... >(You know I'm only funnin' you, Mate... Yer Hog is welcome in my garage >any time.) I might take you up on that invite someday! -- Home page: http://xidos.ca
From: Road Glidin' Don on 14 Jun 2007 21:18 On Thu, 14 Jun 2007 11:59:09 -0700, Rayvan <rvannuland(a)cachevision.com> wrote: >Harley with 80,000 is barely broken in! And almost paid off! -- Home page: http://xidos.ca
From: Road Glidin' Don on 14 Jun 2007 21:19
On Thu, 14 Jun 2007 18:54:08 -0500, "Stephen!" <NO(a)spam.com> wrote: >"Albrecht via MotorcycleKB.com" <u33665(a)uwe> wrote in >news:73b2d13860b1e(a)uwe: > >> The coil fires a "waste spark" when the exhaust valve is open and that >> ignites any mixture left in the exhaust pipe which is rich enough to >> burn. > > So not only are they terribly under powered, they're also horrible >inefficient... Seems if there's that much burnable material left in the >exhaust you'd want to burn it off in the power stroke. But, with that extra spark, I thought we were just doing our part to reduce greenhouse gasses... -- Home page: http://xidos.ca |