PO Box 986, Randwick NSW 2031, Australia Ph: +(612) 9398 5544 Fax: +(612) 9398 5644

Negative Pressure Supercharging

July, 2005

Impulse Engine Technology introduces for the first time "Negative Pressure Supercharging" a revolutionary breakthrough in engine technology that supercharges the engine using a highly advanced thermo fluid dynamic process and NO air pump!

This remarkable new supercharging technology combines the performance advantages of 3 different engines into one engine.

1. Violent acceleration of a race car.
2. Smooth idle and fuel economy of a family car.
3. Massive towing power of a truck from idle.

Negative Pressure Supercharging also doubles the torque from idle to midrange or produces the same torque with an engine of half the capacity.
This allows smaller engines to cost-effectively produce the same acceleration and towing power as much larger engines using low rpm instead of high rpm while improving fuel economy and emissions.

Negative Pressure Supercharging is the most significant breakthrough in engine technology in over 100 years!
The magnitude of this technological breakthrough and the significance it has to the evolution of the 4-stroke engine is enormous. Not only does this new technology supercharge the engine using NO air pump it can also be cost-effectively applied in the form of bolt on Kits to,

1. the 700 million existing cars, pickups, RV's, trucks, buses, motorcycles, boats, farming equipment and propeller planes currently being used worldwide,
2. the 50 million new vehicles produced each year and
3. any 2, 4, 6, 8, 10, 12 cylinder 4-stroke engines produced over the past 100 years at a fraction of the cost of conventional supercharger or turbocharger air pumps.

Another advantage of Negative Pressure Supercharging is that it allows the engine to run on low octane fuel with NO pre-ignition and does not require high octane fuel like today's computerised performance or supercharged engines.

Instead of using mechanically complex parts, high rpm, computers or air pumps to improve the volumetric efficiency of the 4-stroke engine, Impulse Engine Technology focused on supercharging the engine using a highly advanced thermo fluid dynamic process, low rpm and mechanically simple parts.

This led Impulse Engine Technology to develop a number of unique components which include…

1. Compact hi-velocity Tri-Y megaphone headers that reduce the cylinder pressure to a much lower level than the piston does during the intake stroke due to the very low pressure created behind the high gas velocity in the header.
2. Synchronised valve timing that uses early closing intake and exhaust valves, less overlap duration, less exhaust duration and low exhaust valve lift to,
   a)trap the lower pressure in the cylinder during the overlap period produced by the compact hi-velocity Tri-Y megaphone header, and
   b)trap the larger volume of air pulled into the engine at the speed of sound by the substantially lower pressure in the cylinder.

The larger volume of air pulled into the engine by Negative Pressure Supercharging is more difficult to ignite.
This led Impulse Engine Technology to develop a…

1. Hot air induction system that makes the larger volume of air in the cylinder burn much faster, produce more combustion pressure and vapourise more of the fuel which produces more torque using less fuel.
2. Cold cooling system that reduces the combustion temperature to the optimum level required with hot air induction and ultra fast burn.
3. Unique ignition advance curve that uses less advance to prevent pre-ignition and optimise power with the ultra fast burn produced by combining the violent air turbulence of Negative Pressure Supercharging and the faster burn and higher combustion pressure of hot air induction.

Impulse Engine Technology developed the Negative Pressure Supercharging technology on a mechanically simple pushrod 360ci Chrysler V8 and 245ci Chrysler Hemi 6.
By using a mechanically simple pushrod engine with 2 valves per cylinder it allowed Impulse Engine Technology to go back to basics to develop this radical new supercharging process. After many years of development Impulse Engine Technology succeeded in making the Negative Pressure Supercharging process work and fitted the prototype 6cyl and V8 engines to vehicles to demonstrate the lightening acceleration, massive towing power and many other performance improvements it produces over today's mechanically complex engines.

Also, independent businesses in Australia and the USA were so impressed by the huge performance improvement, they are currently setting up 360ci Chrysler V8 engines with Negative Pressure Supercharging to also demonstrate this remarkable new technology.

Negative Pressure Supercharging works differently to the conventional operating principles of the 4-stroke engine which challenges today's automotive engineers to think outside the square.
For example,

A) Engineers have become so comfortable with the knowledge that exhaust headers cannot do any more than scavenge gases they fail to realise…

1. Compact small header pipes connected to a megaphone collector pipe, a) double the gas velocity in the header pipe which produces a very powerful vacuum (low pressure) behind the gas flow which reduces cylinder pressure at the end of the exhaust stroke and b) the megaphone collector eliminates back pressure to allow the small header pipes to maintain a high gas velocity.
2. The high pressure (300psi) exhaust gas exiting the engine can be compressed in a small pipe for only a short distance before it builds up back pressure and restricts the gas flow therefore the small header pipes need to be short and connected to a megaphone collector pipe.
3. A combination of unique valve timing events such as early closing exhaust valves, less overlap duration and low exhaust valve lift trap the low pressure (produced by the small header pipes) in the combustion chamber during the overlap period and with an early opening intake valve it allows the low pressure to pull more air into the engine before the piston moves down the bore during the intake stroke.

B) Engineers have become so comfortable with the knowledge that cold air produces more power than hot air because cold air is more dense they fail to realise…

1. Hot gas explodes with much greater pressure than cold gas.
2. The increase in power produced by the higher combustion pressure of hot gas is much greater than the loss produced by less dense hot air.
3. For hot air to produce more power than cold air, the water temperature needs to be reduced to a low level to maintain the correct combustion temperature with hot air induction.

Negative Pressure Supercharging is a highly advanced and complex supercharging process that is accomplished with a unique combination of mechanically simple parts and does NOT require computers to control it.

Also, due to the complex relationship between the 8 synchronised valve timing events that work together to control and enhance the Negative Pressure Supercharging process, only the relevant valve timing events are mentioned and their description has been simplified in order to help you understand how this new supercharging process works.

For a more detailed description of the operating principles of Negative Pressure Supercharging see How It Works.