Which means, if they are allowed, all seats will need to be replaced with a seat with a higher Copper contents.
This is not true I have been using ti valves since 1969 they was on Ford cast iron heads with no seat inserts the seat were not even Induction hardened at that time (they were released by Ford then for use in Tran's Am Boss 302 and 351 C), we used the first as Intakes as there was no Ti for Exhaust, it would not work according to TRW who was the first to supply. I have run the intakes till the margin was thin and started to chip (small V shapped cracks) we then took these valves and turned them down and made exhaust with a much thicker margin and lasted another couple years.
I WOULD NOT be in favor of the change!
Just trying to set the record straight.
Quote:
Originally Posted by SSDiv6
This craziness has to stop.
At the end, it is not worth the extreme cost for marginal gains.
First, unless they are Physical Vapor Deposition or Chromium Nitride coated, Titanium valves will wear at a faster rate than a SS valve.
Although they have OEM applications such as the Corvette and many motorcycles makes, the valves they use are coated and they use valve seats with a higher Copper contents. Which means, if they are allowed, all seats will need to be replaced with a seat with a higher Copper contents.
When NHRA allowed the use of Titanium valves on the 427 Fords, is due to the fact that at the time it was difficult to obtain hollow stem valves. Weight wise, the Titanium and hollow-stem valves are the same. Also, due to valve train dynamics, the RPM gains are not as much as many may believe.
Today, you can buy good hollow stem SS valves from companies such as Ferrea.
It also makes me wonder how many racers out there are using them.
If the rule change is approved, I can see racers, later on, asking the valve stem size rule be deleted so they can run 7mm valve stems.
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