See if others can give you more on this site. But I really think you'll find the best answers on d-series.org and honda-tech.com ... there are some people there with very exact knowledge of these specific engines--people who have forgotten more than I know. If you can get past the haters, the real experts will steer you right. Anyone else here at EM have an answer?
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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