Barry,
How's your memory on where you found that pdf copy of the BL booklet - any
chance of directing me to it?
Thanks,
Rod. '70 TR6 CC55899L
At 06:10 AM 16/11/99 -0800, Barry Schwartz wrote:
>
>I was reading a PDF copy of the British Leyland Motor Inc., service
>division, dealer training booklet, concerning 1970 emissions data and on
>page 7, it states:
>
>To conform with the emission control standards, imposed by the federal
>authorities, the following engine modifications are incorporated.
>
>1. Exhaust Valves
>Stellite faced exhaust valves are fitted to maintain effective valve
>seating between servicing intervals.
> < snip >
>
>What this means for those of you with 1970 and later vehicles is that you
>needn't worry about using unleaded fuel in your vehicle. From what I
>remember (which is becoming cloudier with age :-}) this is one of those
>changes made to preclude valve wear when unleaded was introduced. Stellite
>(trademark) for those of you who might be interested, is a cobalt-base
>alloy with chromium and other metals; very hard; used to make cutting tools
>and for surfaces subject to heavy wear
>
>I seriously doubt that heads destined only for the USA were the only ones
>fitted with these valves, as I imagine the logistics of determining which
>heads/engines are destined for what country would be more expensive than
>fitting them to all cars. And I'm sure hardened seats would also be
>fitted, as what would be the point of fitting harder valves just to let the
>valves beat the seat to pieces, although I could be mistaken here
>
>Just thought that might clear up a few things (or maybe muddy the waters
>even more ;-0 ??)
>
>
>Barry Schwartz (San Diego) bschwart@pacbell.net
>
>72 PI, V6 Spitfire (daily driver)
>70 GT6+ (when I don't drive the Spit)
>70 Spitfire (long term project)
>
>
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