The ROCKET POWER MUFFLER
Proving itself against other leading brand
The ROCKET POWER MUFFLER
Will change the way your car sounds.
Will increase your PETROL ECONOMY by up to 20%
While offering you - MORE POWER , Better TORQUE & RESPONSE
The unique design incorporates VORTEX MECHANICS,
which sets up a spin effect within the exhaust system DRAWING
THE GASES AWAY FROM YOUR
ENGINE creating true TURBINE EFFECT.
Creating more TORQUE and much LESS FUEL
Typically. Land Rover V8 From I9 Ltrs. per 100km
- TO - 13 Ltrs. per 1OOkm.
STREAMLINE DESIGN allows easy gas flow with LOW
Better heat dissipation and no water catchment
areas ensuring minimal corrosion and very long life.
The VORTEX created in the exhaust system
evacuates the combustion chamber more efficiently to a POINT
OF VACUUM on most vehicles allowing the engine to rev freely.
HOW THE MUFFLER CAME ABOUT
We have always been interested in engine and car
performance to enhance our drag racing capability when it was
1/8 mile & then rally track driving. While I was setting
up Engine performance, I always found exhaust systems to be of
vital importance. e.g. low down power, or top end revs needed
different size & length systems. Street cars with straight
through mufflers had top end power & rev's, while hollow
boxes with offset pipes, had low down power & no revs.
These were some of the options available in sports style
mufflers, which to my mind were inadequate.
After some years in the automotive game and
considerable experience with exhaust systems, I decided there
must be a better way.
First we needed a muffler without square
colliers inside so that moisture and pollutants would not
Secondly we didn't want exhaust gases to reverse
flow causing turbulence & creating unnecessary back
So eventually the Rocket Power concept was born
with its unique solid tubular construction and special conical
ends The inner cylinder has domed ends which absorb the gas
deflects the air flow through the swirl tubes.The SWIRL TUBES
rotate the exhaust gases into a powerful VORTEX.
Thus the name TURBINE EXHAUST SYSTEM. The gas
vortex generates a gas flow from the combustion chamber
through a suction process, rather than a back-pressure
The end result is a brand new Technology in
exhaust muffler systems providing excellent low-end torque
& snappy throttle response due to the streamline flow
In most cases simply replace the standard
muffler in the standard position. Preferred place is situated
before the diff, which also ensures sufficient heat to dry the
muffler from moisture.
It is recommended to install a resonator before
the muffler or at the rear, if this is not possible. ( RPM
resonators are available from this Shopping Trolley )
The Muffler has a nice sounding note a little
like the PORSCHE. I suggest that in some V8's, especially
short wheel base vehicles. install the DOUBLE INSULATED RPM
ensure the noise level is well down.
The RPM Muffler EXHAUST EXTRACTOR system can be
fitted to most PETROL - GAS AND DIESEL ENGINES. In fact we
have had superb results with diesels in the 4-wheel drive
market but there is an untapped market for tractors and earth
moving machinery where pulling power is premium. We are
looking forward to breaking into this market, as the results
to be quite remarkable based on all the data and experience
that we have gained so far.
Rocket Power Mufflers - Testamonials
1. Holden Commodore 1985, VK, 5 litre V8 Engine
is warmed up a little. Has extractors going into 2.5 inch
single pipe then into a Rocket Power Muffler. RPM fitted
Increased 7 bhp at rear wheels. Sounded very good, nice deep
note, excellent power and pick up. Kym was very happy.
2. Holden Commodore 1991, VN, V6 Engine always
pinged under load but when a Rocket Power Muffler was fitted
the pinging disappeared and the exhaust colour went from black
3. Holden Commodore 1987, VL, 3 litre V6
Replaced main muffler with a 2 inch Rocket Power Muffler. Good
power increase, nice sound, fuel savings of approximately 15
to 20 %. Graham was pleased.
4. Ford Fairmont 1972, XA, V8, auto Replaced
standard muffler with 2 inch Rocket Power Muffler. Sounded
good, more power, smoother gear change and 15% less fuel
5.Toyota Landcruiser, 3.5 litre diesel Has
extractors leading into a 2 1/2 inch system with a Walker
super turbo muffler. Once the muffler was replaced with a
Rocket Power Muffler the car has a great exhaust note, more
power low down and reaches maximum revs quicker. Experienced
15% fuel savings.
6. Ford Falcon Station Wagon, ED, 4 litre 6
cylinder motor. Once the standard muffler was replaced with a
Rocket Power Muffler the exhaust note measured 82 decibels
which was the same as the standard muffler. Fuel efficiency
increased by 5 mpg on trips. The power button is not used any
7. Mitsubishi Electroserve L 300 van, 2 litre 4
cylinder motor, auto. The van is on LP gas and is always
loaded with batteries and tools. After fitting a 2 inch Rocket
ower Muffler the van received a big increase in torque and
revs. The van is going faster on the same gas mileage.
8. Ford Falcon, XC, 4.9 litre V8, auto sedan
After the standard muffler was replaced with a Rocket Power
Muffler the car had a nice clear V8 sound. The throttler
response was amazing as it only required 1/2 the throttle
position to maintain the same cruising speed. It felt like the
car was going down hill all the time.
9. Holden Calais, 5 litre V8, The standard
exhaust system was replaced with a set of Genie extractors
with two 2 inch pipes leading into one 2 1/2 inch pipe and
then into a Rocket Power Muffler and resonator. The car
received a big increase in power and around town the mileage
increased from320 km per tank of fuel to 410 kms. His friends
thought he had the motor changed.
10. Mitsubishi Sigma, 2.6 litre 4 cylinder,
sedan After the standard muffler was replaced with a Rocket
Power Muffler the exhaust note changed to a nice note, the
power increased and 15% savings on fuel consumption.
11. Holden Torana, UC, 4.2 litre V8, sedan.
Craig Walkom fitted a 2 1/4 inch Rocket Power Muffler to his
car in October 1995. In November that year he reported that
with the car running a rich mixture it does a tanding quarter
mile in 14.06 seconds achieves 28 1/2 mpg and up to 32 mpg on
12. Volvo, 2.4 litre fuel injected 4 cylinder
station wagon. With the standard muffler the car would
complete 380 km on a full tank of fuel during short runs.
After fitting a Rocket Power Muffler the fuel mileage
increased to 450 kms and had more torque for easier passing.
13. Ford Bronco, 5.8 litre V8, auto The engine
has a 1/2 race camshaft and had a 2 1/2 inch sports exhaust.
The sports muffler was replaced with a Rocket Power Muffler.
The car was dynoed on the same day and gained 7 bhp on gas and
5.3 bhp on fuel. The RPM muffler does not give full increase
of power until the car has completed 200 to 250 kms.
14. Daihatsu Charade Evolution. 1.3 litre and
1.5 litre motors. Maughan Thiem tested a number of sports
mufflers to try and lift torque at low revs. There was very
little torque below 3,200 rpm but after a Rocket Power Muffler
was fitted the torque started at 2,500 rpm. Maughan Thiem was
so impressed with the result that RPM mufflers were fitted to
the Evolution Charades as standard equipment.
15. Holden Kingswood, HQ, 5 litre V8 A Mt Barker
mechanic handyman buys and sells cars. In September 1997 he
fitted a Rocket Power Muffler to a Holden 5 litre V8 and was
happily surprised with the increase in power and the sound and
it sold quickly. He removed a 308 V8 from a U Torana with dual
exhaust system and fitted it to an HQ Holden with a single 2
1/2 inch exhaust and Rocket Power Muffler. He claims that the
HQ has better performance now than the lighter Torana. He
highly recommends the RPM muffler and, has since fitted RPM
mufflers to each car he has bought.
16. Holden Utility, HJ, 5 litre V8 The engine
has a mild race camshaft with 9.6:1 compression. The Walker
Super Turbo was replaced with a Rocket Power Muffler and a
single 2 1/2 inch exhaust System. The ute was dynoed by Road
and Track Services and they recorded an increase in Brake
Horse Power from 229 to 235 at 3,500 rpm.
17. Chrysler Valiant, 1974, 5.2 litre V8 After
fitting a Rocket Power Muffler the fuel consumption has
increased from 14.5 mpg to 18 mpg. Barry feels the muffler
should be called the 'easy breathing muffler'.
18. Ford Falcon, XD, 4.1 litre 6 cylinder This
car has completed 390,000 kms without any major engine
overhauls. The dyno tune tests show an increase of 3 kW from
62 to 65 at 100 kph after fitting a Rocket Power Muffler. Ray
is very pleased with the increase on performance and excellent
fuel economy. Ray regularly travelled on a 137 km trip every
week which cost him $23 in fuel. After fitting the muffler his
fuel bill reduced to $13.
19. Ford Courier diesel utility, 1985, 2.2 litre
4 cylinder Low end torque has improved so that he now crests a
familiar hill at 80 kph which is an increase of 10 kph. Fuel
economy has increased by 10%.20. Kawasaki ZX6, 1996, 600cc, 4
cylinder 4 stroke This bike has been used for racing with a
straight through exhaust system tuned on a bike dyno (Dynojet
model 150). After fitting the bike with a Rocket Power Muffler
the brake horse power increased from 97 to 99 with a higher
21. MGC GT, 1969, 3 litre 6 cylinder The car was
fitted with two hot dog type mufflers and one was replaced
with a Rocket Power Muffler. The car has more low end torque
and revs more easily enabling it to accelerate up hills where
it previously had trouble maintaining the same speed. After a
minor tune by the owner fuel economy has increased be 10%.
22. Ford Falcon 'S', 1991, 4.1 litre 6 cylinder,
auto Fuel economy has increased around town from 500 to 525 km
per tank (65 litres) to 550 to 600 km and country driving from
575 to 600 km per tank to 700 to 725 km.
An Exhaust Muffler
Classification: - international: F01N1/10;
F01N1/12; F01N1/08; (IPC1-7): F01N1/12; F01N1/10
Also published as: AU691775 (B2)
This invention relates to an exhaust system for
an internal combustion engine and in particular to a muffler
The invention will be generally discussed in
relation to its application to a motor vehicle internal
combustion engine exhaust system but it will be realized that
it is equally applicable to other forms of engines such as
stationary engines. The invention may be applied to motor
cycles, motor cars or trucks.
Background of the Invention
An exhaust muffler for a motor vehicle has the
main function of reducing the sound of an engine while at the
same time not causing too much back pressure to the flow of
exhaust from the engine.
It is the object of this invention to provide an
exhaust muffler which has good sound absorbent qualities while
at the same time providing minimal back pressure thereby
enhancing the efficiency of a motor vehicle upon which it is
used or to at least provide the public with a useful
Brief Summary of the Invention
In one form therefore although this may not
necessarily be the only or broadest form, the invention is
said to reside in an exhaust muffler for an internal
combustion engine, the exhaust muffler comprising a casing,
the casing including a tapered outlet end terminating in an
outlet pipe and an inlet pipe at the inlet end, an elongate
cylindrical core having closed ends within the casing, the
elongate core being hollow and the cylindrical surface of the
core being perforated, the casing and the elongate core
defining between them an annular exhaust flow region through
which exhaust gases flow in use, and a plurality of vanes
extending between the core and the casing in the annular
exhaust flow region, the vanes being so shaped that they are
adapted to cause a swirling of the flow of exhaust in the
annular exhaust flow region in use.
It will be seen that by this invention therefore
there is provided an exhaust muffler which has an essentially
straight through flow path only interrupted by vanes which
cause a swirling or helical flow of exhaust through the
exhaust muffler thereby providing minimal back pressure. In
fact the helical flow of the exhaust appears to actually
encourage flow and draw exhaust through the exhaust muffler
and in fact considerable reduction in back pressure is found
Preferably the casing is cylindrical with
frusto-conical tapered outlet ends and inlet ends. This helps
to provide for a smooth flow of exhaust into and out of the
The inlet end may be domed rather than
frusto-conical in shape or may even have a stepped inlet end
between the inlet pipe and the casing because flow in this
region is not so critical.
The elongated core may be perforated so as to
have u[p to 50 percent surface area of apertures. In one
preferred embodiment the apertures amy be each holes of
approximately 3 millimeters diameter.
The elongated core may have domed ends to assist
with flow into and out of the annular exhaust flow region.
Alternatively one or both of the ends of the elongated core
may be tapered to a conical shape.
In one preferred embodiment the inlet end may be
domed and the outlet end tapered.
The elongated core may be filled with an
absorbent material so that some degree of sound absorption can
occur in the elongated core. In one preferred embodiment the
energy absorbent is long strand glass fiber although other
materials which of course would clearly have to be heat
resistant could be used.
The vanes may be helical or spiral and there may
be two, three or four vanes around the periphery of the
In one preferred embodiment of the invention
there may be a first set of four vanes at the inlet end of the
elongated core being helical in configuration and extending
approximately one-third of the length of the elongated core
and then a second set of four vanes terminating at the outlet
end of the elongated core again approximately one-third of the
length of the elongated core.
This has been found to be a sufficient number of
The vanes may be plates or tubes.
In a preferred embodiment the casing may
comprise an inner wall spaced apart from an outer wall
defining a space therebetween and with the inner wall being
perforated. The space between the inner wall and the outer
wall may be filled with fiber glass mat.
A typical exhaust muffler according to this
invention may have a casing with an outside diameter of 125
millimeters and 350 millimeters long and an elongated core 100
millimeters in outside diameter and 350 millimeters long. Each
of the vanes may be made from 12 mm diameter tube 110 mm long
which are curved and then welded to the surface of the
elongated core. The ends of the casing may be frusto-conical
approximately 124 mm long terminating in inlet or outlet pipes
50 mm or 75 mm in diameter.
Using an exhaust muffler of construction of the
present invention it has been found that there has been
increased torque available from an engine and increased
horsepower which has provided an improved fuel consumption for
the vehicle. Although no quantitative sound tests have been
done it does appear that the amount of sound absorption is at
least as good as existing types of mufflers.
This then describes the invention but to assist
with understanding references will now be made to the
accompanying drawings which show preferred embodiments
of the invention.
In the drawings
Fig. 1 shows a cross sectional view of a
first embodiment of an exhaust muffler of the invention;
Fig. 2 shows a cross sectional view of an
alternative embodiment of the invention;
Fig. 3 shows a cross sectional view of a
still further embodiment of the invention;
Fig. 4 shows a cross sectional view of
the embodiment of the exhaust muffler shown in Fig. 1; and
Fig. 5 shows a cross sectional view of a
part of the outer casing of an alternative embodiment of the
exhaust muffler according to this invention.
Now looking more closely at the drawings it will
seem that the exhaust muffler shown in the embodiment shown in
Fig. 1 comprises a casing 1 having a frusto-conical shaped
inlet end 2 and frusto-conical shaped outlet end 3. An inlet
pipe 4 enters the exhaust muffler and outlet pipe 5 exits the
muffler. Within the casing is an elongated core 6 which has
dome shaped inlet end 7 and a dome shaped outlet end 8. Pieces
of piping are bent with a substantially helical form to
provide vanes 9 at the inlet end of the elongated core and
vanes 10 at the outlet end of the elongated core.
In the embodiment shown in Fig 2 the
construction is essentially similar although there is a domed
inlet end 20 to the casing 22 and a conical outlet end 21 to
the elongated core 23.
In the embodiment shown in Fig 3 the vanes 25 of
a substantially helical configuration are comprised of plates
extending between the elongated core 26 and the casing 27.
In Fig 4 which is a cross section on the line
4-4’ in Fig 1 it will be seen that the elongated casing 6 is
filled with long strand glass fibers 27.
In Fig 5 it will be seen that in one embodiment
the outer casing is comprised of an outer layer 30 and an
inner layer 31 with the inner layer being perforated and
having perforations 32 to assist in the absorption of sound
emanating from the muffler. In the space between the inner and
outer wall may be a packing 33 comprised of a suitable
material such as fiber glass mat. Preferably the perforation
may provide up to 40% open spaces in the inner wall.
The construction of the muffler and in
particular defining the space between the inner and the outer
wall may be achieved by fitting by welding the inner wall on
the inside of the extremity of the end cone 34 and fitting by
welding the outer wall to the outside of the extremity of the
end cone 34.
The exhaust muffler of this present invention
may be constructed from steel or stainless steel or any other
suitable material and may be of welded or other suitable
construction. The inlet and outlet pipes may be constructed
for flange slip or welded joining to exhaust pipes of an
internal combustion engine.
Throughout this specification unless the context
requires otherwise, the words ‘comprise’ and ‘including’ will
be understood to imply the inclusion of a stated integer or
group of integers but not the exclusion of any other integer
or group of integers.