Pip,
I did it anyway. Cheers, "Bob".
Brooklands Silencer.
1) An ordinary touring car or cycle must be fitted with an ordinary touring
silencer if and when used on the Track for private and touring purposes as
distinct from competitions.
2) Except as above mentioned all cars and motor-cycles when running on the
Track shall be fitted with the type of silencer hereinafter described.
3) Construction.-
(a) A pipe leading from the exhaust valve or valves shall be led into a
receiver which shall be situated as close as possible to the engine.
(b) This pipe shall penetrate into the receiver to a distance of two
inches, and no more.
(c) The capacity of the receiver mentioned in paragraph (a) shall not be
less than six times the volume swept by one piston of one cylinder of the
engine, and such receiver, if cylindrical, shall not be of greater length
than four times its maximum diameter, and if of irregular shape of
equivalent proportions.
(d) An exit pipe shall lead from this cylinder as far back as the back
axle. This exit pipe shall protrude into the receiver specified in
paragraph (a) to a depth of two inches, and no part of this exit pipe shall
be of greater cross-sectional area than the minimal area of the exhaust port
of any one cylinder.
(e) The pipes leading into and out of the receiver shall not be opposite
each other in the receiver, but shall be out of line to the extent of
one-and-a-half inches measured at points on the circumference, and not
between pipe centres, so that if the pipes were continued there would be a
space between the pipes where they overlapped sufficient to allow of the
passage of a one-and-a-half-inch gauge.
(f) No device may be employed in the receiver which would tend to produce
a straight- through flow of the exhaust gases between the inlet and outlet
pipes.
(g) The exhaust gases must not pass direct from the exit pipe to the
atmosphere but must all be finally emitted from what is commonly known as a
"fish-tail" on the end of the exit pipe. The orifice of such "fish-tail"
shall be approximately rectangular in shape, and of the following
dimensions:-
For engines with a capacity up to
and including two litres
Small dimension : Not more than 1/4 inch
Large dimension : Not less than 6 inches
For engines with a capacity over two litres
Small dimension : Not more than 1/2 inch
Large dimension : Not less than 12 inches
The length of the fish-tail when fitted shall be measured from the end
of the exit pipe to a point situated at the centre of the orifice, and the
length of the fish-tail shall be equal to the large dimension of the
orifice. Thus, if the orifice of the fish-tail is 9" by 1/4 inch, the
distance from the end of the exit pipe (where the tail commences) to the
centre of the orifice shall be 9 inches.
The surfaces of the fish-tail shall be flattened as far as possible, and
shall taper from the end of the exit pipe to the orifice.
(h) The after-half of the sides of the fish-tail, that is to say, the
half of the fish-tail nearer the orifice, may be perforated with holes not
greater than 3/32 inch in diam.
The number of holes is not limited.
4) In spite of the fact that a competitor may have complied with the
above regulations the Brooklands Automobile Racing Club, through its
official or duly appointed representative, shall have the right at any time
to exclude from the Track or grounds within its jurisdiction if in the
opinion of such official or representative such vehicle has made or might
make undue noise.
5) If while any vehicle is using the Track during the progress of a race,
record-breaking attempt or test, or for any purpose whatever, its silencer
should become detached, deranged or broken in such a manner as to allow of
the emission of the exhaust gases through any other place than the orifice
of the fish-tail, such vehicle shall, if competing in any race,
record-breaking attempt or test, be liable from that moment to be
disqualified from taking any further part in any such event, and shall in
any case throttle down and leave theTrack forthwith.
6) The Brooklands Automobile Racing Club by its official or duly
appointed representative reserves the right to examine the interior of any
silencing apparatus fitted on competing vehicles, and may disqualify any
competitor whose apparatus in the opinion of such official or representative
does not comply with these regulations, and may withhold, withdraw or deal
with as it thinks fit, any prize, certificate or other award to which such
competitor would otherwise have become entitled as a result of the use of
the offending vehicle.
Great stuff !
Cheers, "Bob".
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