You can damage Your valve seats and valves. - if the gap is too tight
2011/6/19 Austin Healey <pajtamuvek at gmail.com>
> If You use the car mild and never race it, You can close the gap a bit. I
> dont have experience with Healeys, but on the Mini, factory clearance is
> 0.35mms, and on my road cars I used 0.25 without any long term effect.
> Bt if You push the car (more power-more heat), You can damage Your valve
> seats and valves.
> I dont think that there is any measureable power gain from tighter valve
> clearance.
> Too big gap can damage valve tips/rockers.
>
>
> 2011/6/19 Greg Lemon <glemon at neb.rr.com>
>
>> You get a little more valve lift (like having a slightly hotter cam) if
>> you tighten the gap. However, as things heat up and the metal expands you
>> may not get the valve to close all the way, and hot gas will get by and burn
>> the valve. I have never read anything suggesting you should tighten the
>> clearances up for a little more performance, the very limited benefit is no
>> doubt not worth the very real risk of the burned valve.
>>
>> Greg Lemon
>>
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