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"Oh nearly forgot one other fact .......
The engines are not bench tested when they are made, the first time they are started is at the end of production line when the drivers take them out for an hour test drive round the purpose built circuit."

Bench testing of mass production engines I think are almost unheard of in the last 30 years or so (cannot remember when they were phased out).

A lot of the complex component parts are built and tested, to say less than 1 in 10,000 failure rates, consistant quality is very high.

Also if you bench test you automatically accept you will have failures. Knowing an engine has to be 'right-first-time' concentrates everyones attention on building them to a high standard.
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