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facade wrote:
Best I can come up with is somehow the steel was different, and more rust prone. Certainly we have paper thin "high strength" steel in Modern Cars.
It is a good point. It was a well known claim the the steel in 1972 (or was it '94?? ) was the highest quality for years before and after.
I had a 6 yr old '75 Datsun with a rotten subframe (no surprise there I here you say) and '78 Escort van, again 6 yrs old with a rotten chassis, the front leafspring mount had come through the floor on the rear suspension :woohoo:
The good ol' 70's, imagine that on a 59 /09 reg car now
well metallurgy of steel is better understood now than it ever has been, so the basic product processing gets better and better, but....... a lot of steel produced these days has ever higher percentages of recycled metal in it.
separate story, but a university once proved that steel "learns" how to rust.
two blocks of steel, both new, both from same batch.
one is sand blasted and then allowed to rust.
once rusty, it is brought with the other unrusted bit, to the sand blaster, and both are then blasted,
which one rusted first?
the steel which had already rusted once had gone through a small but significant metallurgic change, and as a result, had learned how to rust, and rusted much quicker in subsequent tests.
and one I've used before for both their rust converter Fe123 and epoxy mastic primer is
www.rust.co.uk/
They also sell Dinotrol underbody waxes which can in some reviews come out better than Waxoyl
Paul
Have you used most of them and which works the best?
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) was the highest quality for years before and after.