OK, thanks for those explanations, I understand what you are saying but I have a question. I have been wondering why the actual volume of that left chamber is so important, and why the increase in volume gained by the addition of the larger PV cover has the effect that it does. I have made a 10mm spacer, and found it made no difference. The aftermarket covers all seem to be about 20mm. What's the significance of this volume and why don't the engine designers get it "right"? How did they come up with the volume that they did?
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Barry
07 EC250
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