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Old 05-05-2018, 03:55 PM   #366 (permalink)
California98Civic
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Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,299

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 2,373
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Valve lash adjustment for FE or emissions?

With my head at the machinist through the weekend, I am working on two or three ecomods. Reinstalling a slightly rebuilt set of wheel skirts, removing and modestly redesigning the side skirts, and most importantly trying to learn if there is a way to do a "fuel economy" or low emmisions valve lash adjustment when I put the head back on and must adjust the valves.

I think tighter lash on both the exhaust and intake will produce longer, earlier, and later openings of the valves and increase overlap. What do you think? A reduced gap between the rocker and the valve stem means longer duration of the opening, with earlier opening and later closing, I think. Overlap is good for scavenging.
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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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