Engineering consultancy Hawtal Whiting Environmental has developed a simple emissions control device designed to be retrofitted to older cars and trucks.
Already patented in the US, the device – called Evec – substantially reduces carbon monoxide (by more than 50% in some independent tests) and hydrocarbon emissons in four-stroke petrol engines.
The patent application describes it as `an automatic bleed valve suitable for attachment to the inlet manifold’. In effect it is a mechanical valve that allows small amounts of air to bleed into the inlet manifold at periods of high vacuum present during deceleration or idling.
Basildon-based HWE is planning to license Evec production, and is already in talks with potential manufacturers. The device is about one-tenth cheaper to manufacture than a catalytic converter, and fits any car without an engine management system or closed loop catalytic converter.