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Valve clearance/lash
https://auszookers.com/forum/viewtopic.php?f=5&t=5005		 Page 1 of 1
Author:  Hybrid [ Fri May 29, 2009 7:00 pm ]
Post subject:  Valve clearance/lash
I know this is done as part of a tune. I know it reduces engine noise too (tapity-tapity). But does it have any bearing on engine performance apart from damage caused by it being adjusted too tight?
Author:  Scrawny [ Fri May 29, 2009 7:02 pm ]
Post subject:  Re: Valve clearance/lash
Yes, it does. If the valves are too loose they won't open enough which will cause an airflow restriction through the cylinder.
Author:  JrZook [ Fri May 29, 2009 7:07 pm ]
Post subject:  Re: Valve clearance/lash
Well too tight and the valves don't close fully, loss of performance. Mmmmmm too loose, increased tappet noise, extremely loose i don't know why you'd adjust them like that, but would result in valve opening stroke loss and hence performance losses. Id say likely hood of extreme damage would be very slim unless you are wayyy of the ballpark.

Anyone else?
Dan
Author:  Scrawny [ Fri May 29, 2009 7:08 pm ]
Post subject:  Re: Valve clearance/lash
You pretty nuch summed it up Dan
Author:  shep [ Sat May 30, 2009 12:07 am ]
Post subject:  Re: Valve clearance/lash
a rattly tappet is a happy tappet :lol:
Author:  royce [ Sat May 30, 2009 12:17 am ]
Post subject:  Re: Valve clearance/lash
the big thing is also valve opening duration, this can drop heaps so you lose power

on certain small pommie engines :wink: they reccomend first setting the tappets with a degree wheel to get the cam timing the same on all cylinders, then note down the different gap settings for future adjustments
Author:  Damo [ Sat May 30, 2009 11:53 am ]
Post subject:  Re: Valve clearance/lash
JrZook wrote:
Well too tight and the valves don't close fully, loss of performance.


Won't this also burn out the valve seats?
Author:  Hybrid [ Sat May 30, 2009 12:32 pm ]
Post subject:  Re: Valve clearance/lash
Damo wrote:
JrZook wrote:
Well too tight and the valves don't close fully, loss of performance.


Won't this also burn out the valve seats?


Yeah that was the engine damage I was talking about. I thought I'd read too tight would burn them.

Though a degree wheel sounds fun I think it's probably slots into my "can't be farked" category. The old G16 is hardly a mini engine :P
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