Cummins has placed development of its 15-liter spark ignition engine on hold for at least six months

Cummins has placed development of its 15-liter spark ignition engine on hold for at least six months, having decided in December that it’s not sure when the market for the 450-horsepower dedicated natural gas product will materialize.

“Around mid-year we’ll take a look at it again,” says Roe East, on-highway natural gas business GM at Cummins, Inc. The firm remains committed to natural gas, he says.

The difference from the now commercial, 11.9-liter ISX12 G with Cummins Westport and the new engine – call it the ISX15 G – is the public infrastructure requirement, he says.

“Reality and Confidence in Reality’

“My gut feeling is that most of the people buying the 12-liter today have dedicated fueling,” East says – or run regular point-to-point routes. “The customer base demanding the 15-liter engine is more likely to run variable routes,” he says. “They need to be confident that they can stop at a public station.”

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