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There were several generations of bonnet used. Initially two were supplied depending on the choice of engine. Lotus Twin Cam powered cars had a flat bonnet with a bulge on the left hand side ( [link] ) to accommodate the twin Weber carburetors and the associated air box ( [link] ). Cars fitted with the Ford 1300 cc or 1600 cc crossflow Kent motors used a single down draft Weber carburetor, and their bonnets needed a bulge on top for clearance of the air filter ( [link] ). Later on a generic bonnet was designed that allowed either type of engine to be used.

A later left hand drive S4 (designated by the front indicator lights integrated into the front wings) fitted with a Lotus Twin Cam as evidenced from the lack of a bulge on top of the bonnet. Unusually, the steel chassis side panels are body colored rather than being painted black.
A later model right hand drive Ford 1600 GT crossflow powered S4 with the front indicator lights integrated with the front wings and a bonnet bulge to clear the downdraft Weber’s air filter.

While the Series 4 Seven’s front wings were of the clamshell type first seen on the Seven America, as opposed to the cycle wing style favored by the Series 1 and 2 cars, the front wings extended all the way to the rear. The advantage of this design was that the passenger on right hand drive cars (see [link] ) or the driver on left hand cars (see [link] ) did not risk burning their ankles on the hot exhaust while entering or exiting the car. The front wings were attached via bolts to the steel side panels. Support for the wings was by a curved steel stay.

The body panels were originally made from self-colored (pigmented) resin fiberglass composite. The color pigment was mixed with the gel coat. While this resulted in a simple finish it did limit the available colors and meant that many S4 Sevens were (or have been) repainted. The original colors included: white, red, light blue, yellow, bright orange, and the very seventies lime green. It should be noted that the self-coloring route predated the use of the technique in the Lotus Esprit of 1976.

The overall look of the Alan Barrett designed body was a cross between the traditional seven look and the type of beach buggy that was in vogue in the 1970’s. Traditionalist bemoaned that the Seven had gone soft. However, one positive result of the new body was that the truly horrible aerodynamic efficiency of the Seven was improved. For example, the rear wings (fenders) were elongated giving a more egg-shape profile. The Series 2 and 3 Sevens (and the subsequent Caterham derivatives) are among the cars with the highest drag coefficients (C D = 0.6). To put this in perspective, a family saloon routinely achieves a C D of 0.3. While exact numbers are not known for the S4 it is considered a significant step in the right direction.

The suspension and steering

The front suspension

The front suspension of the Seven S4 uses the links, anti-roll (sway) bar, and bushes from the Lotus Europa. This had two advantages:

  1. The parts were cheaper and readily available in the factory parts bin.
  2. Abandoning the Lotus 12 type front suspension (in which the upper wishbone was actually comprised of a single top link and the anti-roll bar) meant that the Seven had a true double wishbone front suspension for the first time.

Questions & Answers

How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
How can I make nanorobot?
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
how can I make nanorobot?
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
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Source:  OpenStax, Lotus seven s4 (type 60): design, restoration, and maintenance. OpenStax CNX. Jun 07, 2013 Download for free at http://cnx.org/content/col11418/1.19
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