Design
The car was a classic Chapman design, being extremely light and simple; the body was made up of lightweight panels bolted to heavily-triangulated tube frame (almost spaceframe) chassis. Thus the car was rigid and strong, maintaining the 16's forward weight distribution despite the engine moving behind the driver.
It was powered initially by a 2,494.93 cc Coventry Climax (3.70 x 3.54 in) four cylinder engine inherited from the Lotus 16 which produced 239 hp (178 kW) at 6,750 rpm from a weight of only 290 lbs (132 kg) and had a wide torque range. In order to capitalize on this weight advantage, Chapman designed a light, sleek machine only 28 inches (71 cm) high (excluding windscreen) and weighing just 980 lbs (440 kg). To help facilitate this, the driver was placed in a semi-reclining position, pioneered about a decade before by Gustav Baumm of NSU.
Read more about this topic: Lotus 18
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