Editing Ford CVH engine (section)

===Noise, vibration, harshness===
Throughout its 20-year production life, the CVH had a reputation for excessive [[noise, vibration, and harshness]] (NVH). [[Jeremy Clarkson]] said of the CVH-powered Escort that "''it was powered by engines so rough, even [[Moulinex]] wouldn't use them''".<ref name="gomog-hist"/> This harshness is mostly due to the cylinder head and valvetrain design.{{citation needed|date=December 2024}} At {{cvt|220|lb|abbr=on}} at full lift, the valve springs in the CVH are considerably stiffer than is typical in other engines. The stiff springs are needed to overcome the weight of the rocker arms and hydraulic self-adjusting tappets used and thereby prevent valve float, which they do up to around 6700 rpm. The stiff valve springs add more friction and pressure to the already high-friction "flat tappet" design.