I like your thoughts on the CBR, I think it may be lacking a bit in power and slightly loud for the application? I'm not familiar with "miller cycle", I'll check it out!
I value your opinion too.
I'm NOT an advocate for E85, here's why. It takes more energy to produce E85 than it does regular unleaded and/or diesel fuel and it's less efficient. Yes, there is a marketing value to saying your car runs on E85 but it's an overall bad idea out of the gaits. One of my farmer friends in Indiana set up his own ethanol plant and is producing...he and I go round and round on the topic. However, his goal was to drive capital in other was than just farming. My goal is to protect the planet and help others to do so as well. Personally, I think the E85 craze will fizzle out as government funding does. Why not a small diesel motor running on Veg oil? Low RPM's, quiet, hit torque to weight ratio, etc... Just my thoughts, not saying I'm all right here though.
Wayne
SC
Quote:
Originally Posted by serialk11r
That's a cool idea too, although the reason I mention the CBR motor is because it probably weighs next to nothing, and has very good power to weight ratio. The compression ratio is high and the rod stroke ratio is high so that offsets the "inherent" inefficiency of running at higher speed, I don't know what the cam specs are but I imagine regrinding the exhaust cam for say 5krpm rather than 10k, and then retarding the intake cam position to reduce volumetric efficiency should give a small bump in efficiency. Since it's a bike motor it probably has stupid long duration, so this might allow stoichiometric air fuel ratios at full throttle. At 5000rpm you could probably make 15hp? which is probably adequate for high speed highway cruising. If not, a turbocharger might be appropriate, with "miller cycle" operation.
The only thing is, if you use say E85 for renewableness, the port injection kinda wastes some of the charge cooling. Perhaps moving the injector upstream would be good, if more of the alcohol is vaporized before it hits the valves then less heat will be transferred to them. Also the compression ratio would need another bump to utilize the alcohol effectively, which is hard to do with the short stroke messing up in cylinder flow and combustion chamber geometry. I guess that's another argument for a turbo?
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