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Originally Posted by Pacman
Doesn't the hemispherical combustion chamber of the DOHC get any credit for better MPG? I know the burn patter for a Hemispherical chamber is better then the others.
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i know this post is really old but i cant believe noone flamed him for this! how would you ever fit four valves in a half a sphere? it would be nearly impossible to engineer a head with those kind of angles. every modern motor uses a pentroof configuration, with the exception of the new hemi motors which are less effecient. in addition to having less valves than the pent roof the hemisperical combustion chamber is also bigger in general. with the bigger chamber, you lose much more heat during combustion and also increase the distance the flame has to travel during ingnition. do some reaserch before saying something as ridiculous as that!
also having nearly identical motors but w diff heads, the dohc will always win out because its engineered better. tech progresses and so does effecency.
my question is would the dual cam motor be cheaper to run on crap gas or 91? how much does 91 increase mpg compaired to the cost of it?