[TELVM]

I put grooves in the chambers of my Calibra 2.0i 8V engine seeking not better fuel mileage, but resistance to detonation and more horsepower (I raised CR from 9.2:1 to 11.0:1, plus several other pinging-prone mods).

Then to my amusement I found that the fuel consumption had decreased at partial throttle. To me, more HP at WOT and more mpg at partial is a fine deal. But that's just me.


This forum is also about lower fuel consumption ...

mpg Research • Index page

... and they have a sub-forum dedicated to the grooves:

mpg Research • View forum - Somender's Grooves


Here's a thread on the subject at the TeamSwift forum (Suzuki Swift = Geo Metro):

TeamSwift • View topic - Combustion chamber grooves=better economy??