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The Wife and the Car
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Discussion Starter #1
We had an old fox as our Chief Mechanic.
He was getting some pretty amazing results just by playing with the Valve Clearances.

How does minute changes to the Valve clearances effect the engine's output.
Its easy to say run what the manufacturer of the cam recommends. Its easy to say less clearance gives your more power.

But in actual fact things are a bit more complicated. Can somebody explain this.
What I did notice was that playing with the valve clearances seemed to move the power band around a bit.
 

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99 Hatch
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Changing valve clearances slight (very slightly) effects the timing events of the cam and the duration/overlap. It is generally not recommended to go too tight, especially on the exhaust side.
This is true.

You can also run one valve tighter then the second one, this will have one valve open before the other.
 

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same
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dont forget the small change in valve lift based on lash... less lash more lift higher peak power, more lash less lift more low end torque peak horsepower at a lower rpm.....

this is really stretching for the last 1/10th of a HP though alot of circle track V8 guys will adjust lash to suit their needs (more power at the end of the straigth or better torque out the corner.
 
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