To shorten the time required from ignition to completion of the combustion cycle, the traditional method of gasoline engine combustion uses acceleration of the gas flow by squish and swirl. As most engine types have only a single ignition plug that produces a spark and causes flame to spread to the entire combustion chamber, the speed of combustion is limited. However, in order to use multiple sources of ignition in the limited space of the combustion chamber, the optimum layout of the intake and exhaust valves must be compromised.
The Miyama Multispark Multiple Point Ignition System solves this design problem by placing multiple ignition gaps around the perimeter of the engine cylinders. The Multispark system allows for customization of the layout and the number of ignition points with no trade-off for rapid combustion.
The Multispark system at first appears as little more than a slightly thicker cylinder head gasket. As such, there are no significant modifications or special equipment needed to implement it. Thanks to this configuration, simply replacing the existing head gasket with the Multispark unit provides the advantages or rapid combustion. Both the number and location of the ignition points can be easily changed and adapted to fit many engine designs.
KTM390 DUKE MOTORCYCLE ENGINE
Multispark System installed on the KTM390 single cylinder engine.
Multispark System installed and tested on a high-speed race engine.
OPENED OUR NEW RESEARCH & DEVELOPMENT CENTER (“Miyama R&D center”)
Opened our new engine research and testing facility “R&D center” in Nagano, Japan. Established a new engine bench room there.
PRESENTATION AT INTERNATIONAL CONFERENCE
Presented Multispark System at the “3rd International Conference on Ignition Systems for Gasoline Engines” in Berlin, Germany.
TEST PLUG-IN MULTISPARK SYSTEM ON ORIGINAL ENGINE “M224”
Started trial to demonstrate plug-in Multispark System with self-developed engine “M224”. M224 has characteristics of high compression ratio and conrod stroke ratio.
NEW TYPE OF MULTISPARK SYSTEM
Launched test for new plug-in Multispark System. This new device is inserted into the lower part of the intake and exhaust port and makes plug replacement and maintenance easier.
Multispark.net English Website Launch
Launched a new English website and English video for the Multispark Ignition Project
Multispark System Fitted to Subaru BRZ
Multispark System successfully fitted and tested in a new Subaru BRZ 2.0 liter boxer engine
03 jun 2014
System Installed in a Daihatsu Mira
Multispark System fitted and installed in a Daihatsu Mira - a Japanese lightweight compact car - 660cc engine.
Multispark System installed on a motorscooter
Multispark System successfully installed on a Yamaha Majesty motorscooter
Multispark System Installed and Tested on a Chevrolet V8 Engine
2 Cycle Enduro Motorcycle Engine
Installed the Multispark System on a 2-stroke SHERCO Enduro Motorcycle Engine.
We recorded the 2-stroke Engine cycle with Hi-speed Videos for analysis and demonstration.
Multispark.net Website Opened
The first version of the Multispark.net website is released and available to the public.
Subaru BRZ Boxer Engine
Started Development for the Subaru BRZ 4-cylinder Boxer Engine setup
Ducati 748 Motorcycle Engine
Researched and tested the application of the Multispark System on a Ducati 748 Motorcycle Engine
Kawasaki D-Tracker Motorcycle Engine
Researched and tested the application of the Multispark System on a Kawasaki D-Tracker Motorcycle Engine
Nissan SR20DET Turbo Engine Setup
Multispark System successfully installed into a Nissan Silvia SR20DET 4-Cylinder Turbo Engine
Test Data Update
New test results show Thermal Efficiency greater than 44%.
Birkin Super 7 Installation and Test
Multispark System installed in a Birkin Super 7 Kit Car
Thermal Efficiency Data Update
Extensive testing results in thermal efficiency improvements of over 40%.
Test Car Milage Update
As of June 2009, our three test cars have driven over 5000km.
Started work on Nissan SR20DE installation
Began Research and Development for the Nissan SR20DE (nomally aspirated engine)
Installed the Multispark System in a Honda S2000.
NEW Testing & Research Facility
Began construction of our new engine research and testing facility in Nagano, Japan.
Toyota Altezza Installation
Multispark System installed in a Toyota Altezza (normally aspirated engine)
Multispark System first installation and test
Multispark System installed in a Mitsubishi Lancer Evolution's 4-cylinder 4G63 Turbo Engine with impressive results
In the Otto cycle, the following three conditions need to be achieved to increase thermal efficiency: rapid combustion, high compression ration, and a lean burn.
The multiple ignition points, each of which consists of the electrode pair of ceramic insulator and heat resistant alloy, form discharge gaps in series. The ignition process is simple and similar to ordinary spark plugs: application of high voltage to one terminal from the coil. The new ignition points fire simultaneously with the existing spark plug and this results in much faster combustion and higher thermal efficiency.
The flames generated in the center and on the perimeter of the combustion chamber promptly and steadily burn the gas mixture. According to our test results, in the constant volume combustion chamber, the time period from initiation of ignition to completion of combustion throughout the chamber was reduced by half - only 15ms when using the Multispark setup compared to 30ms with a standard single point spark plug setup. These results indicate that the Multispark System can largely retard the ignition timing when compared to single point ignition systems. As the gas mixture is compressed and gets much denser when combustion starts, loss of time is significantly reduced.
The realization of rapid combustion can avoid the engine knocking problems which are the largest hurdle to a high compression ration. Furthermore, efficient combustion resulting from the Multispark system improves combustion stability under lean mixture conditions. Thus, higher thermal efficiency than standard gasoline engines can be achieved.
We have verified a maximum thermal efficiency of up to 44% during our tests.
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