https://www.trucknews.com/equipment...with-diesel-like-performance/1003141339/Sample quote
Saradhi Rengarajan, technical project leader with Cummins, said the most exciting aspect of the project was the torque the designers were able to achieve. Peak torque is 900 lb.-ft., far exceeding propane engines already in the market.
The efficiency of the engine has also led to favorable emissions performance, with CO2 emissions 11% less than a diesel, Rengarajan noted, while traditionally LPG engines had greater CO2 output than diesels. He said the 6.7L LPG offers a 28% improvement in CO2 output compared to propane engines in the market today.
Part of that CO2 improvement came from optimization of the combustion system, which allowed Cummins to avoid exhaust gas recirculation (EGR). The biggest challenge designers had to overcome when testing the engine was related to injector failures, which caused the company to adopt a vapour phase injection (VPI) system, sacrificing up to 1% in thermal efficiency in exchange for greater reliability.
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