Editing Quad 4 engine (section)

====Feuling BE engine====
[[File:Quad4-1000.JPG|thumb|right|Twin-turbo Feuling BE engine with one external port per valve]]
In Ventura, California, Feuling Engineering undertook development of an experimental engine subject to the same set of restrictions set by Oldsmobile. Feuling's design focused on thermal efficiency and heat rejection. Like the Batten engine, Feuling's BE is an all-aluminum design, with an alloy sump able to handle structural loads. The Feuling block was developed by Keith Black Racing Engines, who produced a Y-block with deep skirts. This engine was also linered — in this case by a set of aluminum/[[Nikasil]] liners courtesy of [[Mahle GmbH|Mahle]].<ref name="hrm-apr1987b"/>

The engine's camshaft profiles were the result of a collaboration between Feuling, Engle Manufacturing Company, and Dick Jones Camshafts. In the BE, the camshafts are driven by timing belts rather than chains. Each intake and exhaust valve has its own external port. External manifolding connects each exhaust port to one of two different turbochargers.<ref name="hrm-apr1987b"/>

Feuling later used a similar cylinder head design on what is reported to be a Cosworth block to create a Feuling/Oldsmobile V8 engine intended for Indianapolis.<ref name="mas-fov8"/> This was a different engine than Oldsmobile's own Aurora IMSA/IRL racing V8.

Output of the Feuling BE engine is estimated to have been approximately {{cvt|1000|hp|kW}}. It was used in the long-tail Aerotech car.<ref name="oo-aerotech"/>

Applications:
[[Oldsmobile Aerotech]] long-tail