|
advancing the timing is limeted by your octane rating, shortning the cam duration and lowering the lift will increase low rpm torque without the preingnition problems of advancing cam timing. the milage cams for v-8,s all have low lift and duration it just moves the engines powerband down lower and kills high rpm power, toyota could make an echo that got way more mpg ,,but it would be way slower and they could not sell enough of them, they compromise when designing the engine i want to make it a mpg specific engine and am looking at increasing the length of the primary tubes and the collector on the exaust, maybe a slight reduction in tube diameter and adding length to the intake side as well, a cam change will fit into the design as well all of these things work on v-8,s i know first hand, will they work on my 1.5 4 echo it should! i can do most of the fabricating myself making the mods cheap enough for me to try,,, i will be working on this over a long timeline as i plan on keeping this car until a battery powered one is a viable choice for me 5-7 years maybe ? i commute 105 miles a day for work. i could be totally wrong about all of this ,but i am suprised there is not more going on with you hypermilers on engine internals,, im not talking about not doing all the other mods im talking about adding these to it, having smaller valves installed,smaller tube, longer primary hedder tubes, lowering cam lift ,duration,lengthing intake runner length, all worth a try i think.
|