Fwd from Dave Elliott (Dave UK) [EMAIL PROTECTED]
Take alook at www.zoche.de and www.dair.co.uk These are aircraft engines so for maximum reliability, are more heavily built and deliver less power than a road engine of similar design could easily manage. The big advantages are... Simple parts: No camshaft No poppet valves cam followers etc Single throw crankshaft cheap to make Simple cylinder design cheap to make Small size - No top end valve gear and separate sump can go anywhere convenient. No need for separate cooling system. Zoche use air, but sump oil would easily do the job. No more emissions than a 4 stroke because it does not draw air through the crankcase. Blowers make sure cylinders are well purged diluting NOx and we even arrange a measure of exhaust recirculation. Far more power as we get 4 power pulses per turn of the crank. I thought for bit Use roller bearings on crank big ends and small ends then a low pressure oil pump would serve everything. It could even be lubricated with biodiesel, the fuel being drawn from the hot oil sump return (via filter) and topped up from the tank. - No need for sump oil changes. This goes further - as fuel is the lubricant no need for oil control rings on pistons so less friction losses. Use Elsbett piston anmd injector design and efficiency goes up further. They spin the air inside combustion chamber so that the flame does not touch metal until fully fuel is burnt. They used to hand make some excellent engines but they were too expensive to survive. They also had a clever 2 part pistion which allowed much closer cylinder clearances. Without electronics road power may be around 70bhp per litre (50 in similar capacity electronic controlled 4 str turbo). But with electronics I could see it easily giving up to 100bhp per litre. The Alfa Romeo 156 2.4 litre can be rechipped to give 170bhp and better economy than standard. I think a radial 2 stroke with similar electronic and injection equipment could deliver that from half the capacity. The big snag is that car makers are geared up to mass produce inline 4 pot 4 stroke engines. They are most unlikely to totally rejig their plants to suit a different configuration. Again (like biodiesel) it would be down to home engineers but who can afford to build their own engines. D -------------------------- eGroups Sponsor -------------------------~-~> eLerts It's Easy. It's Fun. Best of All, it's Free! http://click.egroups.com/1/9699/0/_/837408/_/977239363/ ---------------------------------------------------------------------_-> Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html To unsubscribe, send an email to: [EMAIL PROTECTED]
