Hoerbiger Expands VariSpark Digital Ignition Line

New products accommodate wider range of gas engine.


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Hoerbiger has launched two new sizes in its Altronic VariSpark ignition product line for modern gas-powered engines.

Besides the existing XL size for large-bore, slow-speed gas engines, especially for integral compressor applications, Hoerbiger has added the XS for small-bore, high-speed gas engines between 670 and 1340 hp (500 and 1000 kW) and the XM size for large-bore, medium-speed gas engines up to 13,410 hp (10 MW) and beyond.

In addition to realizing a maximum spark voltage of 50,000 V, the VariSpark system can shape the profile of the spark, thus adjusting the voltage to the specific engine gas mixture and application.

“Modern gas engines adopt several technologies to achieve a lean combustion,” said Gerhard Ranegger, head of Hoerbiger’s Business Unit Engine Solutions. “With higher boost pressures, two-stage turbocharging, high BEMP and very lean mixtures, conventional spark ignition systems are not able to ignite the mixture.

“VariSpark delivers an energy per spark event that can be as high as 20 times that provided in a conventional ignition system, thus assuring reliable combustion and eliminating the risk of misfiring.”

Ranegger said the use of a system as VariSpark is essential for the performance of the engine and also gives the engine manufacturer more freedom to shape and optimize the ignition.

VariSpark is electronically controlled and the optimization is ...

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