Comments: 1-15, 16-17
Actually the second to last poster was only slightly wrong, the 2.5 V6 Mondeo engine does have an imrc controller that 'seals' shut 6 of the inlet valves until around 3.5k rpm.
This is sort of a vtec system as it restricts airflow to all 6 cylinders until the specified rpm so as to increase economy and smooth running.
I should know; I've stripped and rebuilt 5 of these engines in road and race trim.
This is a review of the ST220, which has the 3.0 V6, which has a fixed intake, no IMRC and all intake valves are fed via the same intake route at all rpm.
The 3.0V6 does not suffer from any of the 2.5V6 intake issues.
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