"what was wrong with a sprung loaded pulley ??? "
simple answer really , production cost ££££ .
In any production industry the manufactures are always looking at ways to reduce production cost without effecting the product quality or function.
The numbers in car production are massive so the smallest gains add up quickly.
lets say Ford Produce 150,000 1.4 16V power unit per year. Each belt tensioner cost Ford £6.
That's £900,000 saving just by fitting a stretch belt.
cost cutting is a on going process , that's why we see so much plastic used on engines. Much cheaper than Steel or Die cast alloy.
It's like the spare tyre situation look at the cost saving per car , tyre , wheel , jack & tools fixtures and fittings.
weight saving and cost saving , win win situation.
just put a can of tyre weld in the boot and 3 years road side cover.
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