Hello Guy,
I read the 1rst book and found your recommendation for valve to piston clearance during overlap.
But what are the figures for the valve to valve clearance? I mean if you increase the intake valve size diameter you have this dimension decreasing so what is the limit to respect?
It is for the R5 Alpine engine built by a friend (the intake valve going from 38.5 to 41.5 mm) as we discussed previously concerning the head prep.
Thank you,
Robert
Valve to valve clearance during overlap
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Re: Valve to valve clearance during overlap
hi Rob
the minimum valve - valve I would tolerate at 'new build' is 0.020" (0.50mm) but much depends on valve-guide clearance, my figure is based on my work. The more loose the valve-guide fit the more you need.
I would generally try to achieve 0.040" (1mm) at new build.
I hope this helps,
G
the minimum valve - valve I would tolerate at 'new build' is 0.020" (0.50mm) but much depends on valve-guide clearance, my figure is based on my work. The more loose the valve-guide fit the more you need.
I would generally try to achieve 0.040" (1mm) at new build.
I hope this helps,
G
Guy Croft, owner
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