The ROCKET POWER MUFFLER
Proving itself against other leading brand names
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 CONSUMPTION
Typically. Land Rover V8 From I9 Ltrs. per 100km - TO - 13
Ltrs. per 1OOkm.
STREAMLINE DESIGN allows easy gas flow with LOW TURBULANCE.
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
First we needed a muffler without square colliers inside so
that moisture and pollutants would not accumulate.
Secondly we didn't want exhaust gases to reverse flow causing
turbulence & creating unnecessary back pressure
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 pulses and
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 process.
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 design.
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
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 MUFFLER to
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 February 1996.
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 to grey.
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 consumed.
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 more.
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
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 the highway.
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 power
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 arrangement.
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
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 alternative.
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 in practice.
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 muffler.
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
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
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
The vanes may be helical or spiral and there may be two,
three or four vanes around the periphery of the elongated
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 vanes.
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
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
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.