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Old 07-30-2014, 09:47 PM   #1 (permalink)
Cyborg ECU
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Join Date: Mar 2011
Location: Coastal Southern California
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Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
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Question Adjusting valve clearances

Adjusting valve clearances on my D16y7 Honda Civic 1998 Engine. Following the Honda FSM's directions, I measured the clearances with a feeler gauge tonight.

Three questions about the below "data."
QUESTION 1: How badly do you think such clearances effect emissions and/or FE?
QUESTION 2: When I go to adjusting can I leave #2 and #3 alone?
QUESTION 3: Should I be adjusting the valves for an optimum "feel" at 8 for the intakes and 10 for the exhaust, in other words right in the middle of spec?

Here is what I measured (numbers in parenthesis mean it seems tight or loose):

Cylinder #1
intake spec 7-9
left 6 right 7(6)
exhaust spec (9-11)
left 9 right 7(6)

Cylinder #2
left 7 right 7
left 9 right 9

Cylinder #3
left 7 right 7
left 9 right 9

Cylinder #4
left 7(6) right 7
left 9(10) right 9(10)

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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