Greg
Scoot Enthusiast
Posts: 218
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Valves
Apr 18, 2012 19:07:50 GMT -5
Post by Greg on Apr 18, 2012 19:07:50 GMT -5
I have seen many posts that say "Adjust the valve lash", and it works.
I'm trying to wrap my head around why?
Why does it work?
What is happening?
Are the valves becoming more "seated" so the gaps get tighter (and valves are staying open)?
Or is it the opposite and the gaps get bigger (and valves are no longer opening far enough)?
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Deleted
Deleted Member
Posts: 0
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Valves
Apr 18, 2012 19:14:46 GMT -5
Post by Deleted on Apr 18, 2012 19:14:46 GMT -5
Its your final valve timing adjustment. 'In four-stroke cycle engines and some two-stroke cycle engines, the valve timing is controlled by the camshaft. It can be varied by modifying the camshaft, or it can be varied during engine operation by the relatively new technology of variable valve timing. It is also affected by the adjustment of the valve mechanism, and particularly by the tappet clearance.'en.wikipedia.org/wiki/Valve_timing |
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Deleted
Deleted Member
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Valves
Apr 18, 2012 19:18:29 GMT -5
Post by Deleted on Apr 18, 2012 19:18:29 GMT -5
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Deleted
Deleted Member
Posts: 0
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Valves
Apr 18, 2012 19:20:10 GMT -5
Post by Deleted on Apr 18, 2012 19:20:10 GMT -5
lash=clearance
tappet=lifter
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Greg
Scoot Enthusiast
Posts: 218
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Valves
Apr 18, 2012 19:28:09 GMT -5
Post by Greg on Apr 18, 2012 19:28:09 GMT -5
Wow!
I was thinking in terms of clearance such as, "valve not opening far enough" and "valve staying open".
I wasn't thinking at all in terms of "valve opening at the right time".
So a larger gap is a valve that opens later.
Let's say you have an engine that was never adjusted since new and now has 1000 miles on it.
When going to adjust valves, will they most likely be too tight or too loose?
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Deleted
Deleted Member
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Valves
Apr 18, 2012 19:35:35 GMT -5
Post by Deleted on Apr 18, 2012 19:35:35 GMT -5
in that case...and in my experience...they are always tight.
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Valves
Apr 18, 2012 20:00:18 GMT -5
Post by Fox on Apr 18, 2012 20:00:18 GMT -5
A valve with no clearance, (tight) is a valve that isn't closing all the way and that means compression loss, hard starting, stalling etc...
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Valves
Apr 18, 2012 20:41:15 GMT -5
Post by skuttadawg on Apr 18, 2012 20:41:15 GMT -5
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Deleted
Deleted Member
Posts: 0
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Valves
Apr 18, 2012 20:48:12 GMT -5
Post by Deleted on Apr 18, 2012 20:48:12 GMT -5
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Valves
Apr 18, 2012 20:50:38 GMT -5
Post by skuttadawg on Apr 18, 2012 20:50:38 GMT -5
Duh its in English maybe you need Adobe Acrobat or its plug in for your browser
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Deleted
Deleted Member
Posts: 0
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Valves
Apr 18, 2012 20:52:55 GMT -5
Post by Deleted on Apr 18, 2012 20:52:55 GMT -5
oh i see that .pdf full of broken chinese engrish just fine Sir.
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Greg
Scoot Enthusiast
Posts: 218
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Valves
Apr 19, 2012 6:34:43 GMT -5
Post by Greg on Apr 19, 2012 6:34:43 GMT -5
I have had that Chinese manual for a long time. It is somewhat helpful at times.
The Haynes manual is out of stock. I wonder if it will come back in stock again?
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Deleted
Deleted Member
Posts: 0
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Valves
Apr 19, 2012 6:53:10 GMT -5
Post by Deleted on Apr 19, 2012 6:53:10 GMT -5
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Greg
Scoot Enthusiast
Posts: 218
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Valves
Apr 19, 2012 17:59:50 GMT -5
Post by Greg on Apr 19, 2012 17:59:50 GMT -5
And poof, there it is! LOL
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