Re: Hardened valve seats or lead additive...
Posted by Craig Hendrickson On 2012/11/28 14:49:33
Owen_Dyneto Quote:
I don't know if this is the same chart that Craig and JW are referring to, it's been around the hobby for years and I know I've posted it here before.
That's the chart. The gray line from 60 to 90MPH at 19 Spec-Wt is my 1955 Patrician. You can see that sustained driving at 85MPH is "Very likely" to cause valve recession. I can vouch for the accuracy of that! Of course, this chart only applies to non-hardened (original) exhaust seats.
Craig
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