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Home > Help Needed / General Tech Chat > Valve seat width

Turbo Phil

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My sister is so fit I won't show anyone her picture

Lake District

1st Dec, 2007 at 06:00:27pm

Doing some modifications to a head at the moment, i'm just wondering what width i should leave the valve seat ? Obviously it should be a bit wider to deal with the heat, but what width is safe ?
I guess the inlet can go down to 0.040" or so without any real probs ?

Phil. :)

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BENROSS

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Resident Cylinder Head Modifier

Mitsi Evo 7, 911, Cossie. & all the chavs ...... won no problem

2nd Dec, 2007 at 10:53:54am

yes phil 0.040" inlets
exhausts 0.060"

95% +... heat is conducted up the stem

Vegard

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Chief ancient post excavator

Norway

2nd Dec, 2007 at 11:28:21am

I think you've got your results bacwards there Ben. Most of the head is conducted by the valve seats. I'm using .040" exhaust as well. That suffices. I'm on .020" inlets.

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.

Turbo Phil

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4641 Posts
Member #: 20
My sister is so fit I won't show anyone her picture

Lake District

2nd Dec, 2007 at 11:23:44pm

I thought 0.060" may have been to thin, but i guess it should be fine then, especially as you've gone even thinner V with no trouble !
I thought there was little or no advantage of going thinner than about 0.040" though ?

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