Quote:
Originally Posted by lloyd123
Non hybrid engines use what's called the Otto Cycle which I think produces better power from the fuel. Hybrid engines use the Atkinson Cycle (like the diet I guess) which produces better ecomomy/emissions. It all has something to do with crankshaft position, ignition timing, valve timing and two timing - scratch that last one - a feeble attempt at humor.
http://en.wikipedia.org/wiki/Atkinson_cycle
I would assume Consumer Reports findings were for cars using the otto cycle. Perhaps hybrid engines can take advantage of higher octane but if they could you would think manufacturers would let you know about it. I'm sure it wouldn't be something they'd try to hide. |
The Atkinson Cycle is really just a 4 cycle engine with the timing of ignition and valves that enable a longer power (combustion stroke) to extract more energy from the power event. The longer time for the combustion to complete (related to eariler ignition and later opening of the exhaust valve) lends it's self to the use of hight octane rather well. I think that the reason it is not stressed is that the manufactures want to say uses Regular gas very badly. I give a comparasion test run but need to wait until I am finished with the break in period. If any of you have completed that a well controlled test. Same rout in both directions at same temperature winds etc would be very valuable to the entire community. Google Atkinson Cycle for additional information. I had a previous engine with this setup it had a scroll belt driven supercharger and produced smooth power and goor economy which is why they use it.