Is the first gen compression ratio versus the second really that far apart? is compression ratio important is his calculation? this is an interesting way to look at it, using his method though i have some questions... i'm not sure what part of the engine he is comparing? technology? looking at only peak hp at its specific rpm, is it sustainable? i know honda can run at 7400 rpm, but are you going to be at 7400 rpm all the time? not that comparing different engines at the same rpm is the solution, but if you could add peak torque at its rpm, and number of cylinders to that equation, i think it would make truer sense of engines. not sure how to do it, mathematically speaking..

i also cannot make sense of what the 1200 multiplier stands for, how did he come up with that number?


but using his equation:

hayabusa :

1.3l with 145 kw at 9500 rpm = 16.03 bmep

an audi tt 225 engine:

1.8l with 165kw at 5900 rpm = 18.64 bmep

vxr corsa:

1.6l with 141kw at 5850 rpm = 18.07 bmep

i put the vxr here because according to my research the ecotec aveo uses the same block, and head. its just a detuned engine.. non turbo, naturally aspirated us emissions design...

the new aveo versus the old is ecotec: 105 ft/lbs @ 3800 rpm and the etecII: 107 ft/lbs @ 3600 rpm so the etec is a slightly torquey motor compared to the ecotec, but with less peak hp.. i believe (not sure honestly) with the variable vale timing change, that the ecotec has more hp and torque through the power curve overall?

i dont think either engine is better than the other.. and that most of the fuel economy is from a slight change in gearing..