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My apologies Geebee, I'm not a native English speaker and didn't understood your words correctly. You are right, the grooved head made less power at WOT in this experiment.
Did you also see that the grooved head made more power, with better thermal efficiency and better brake specific fuel consumption, at partial loads? Also the EGTs were lower at all conditions.
I'd like to remark that in this test the grooved head was standard compression ratio. To maximize their effects the grooves should be accompanied with a raise in CR.
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