THE BREAKDOWN Hydromax set a class record at Bonneville with a 368.347 mph two-run average. The JCB Hydromax was not supposed to rewrite the Bonneville record books before its world record shot, but that is exactly what happened. The SCTA result gives JCB a verified benchmark before the Fédération Internationale de l’Automobile (FIA) world record attempt that is coming next. Gallery: JCB Hydromax 14 Source: JCBSCTA RecordJCB’s Hydromax streamliner now holds the SCTA Blown Gas Streamliner (AA/BGS, 500-plus cubic inches) class record at Bonneville with an average of 368.347 mph. Hydrogen Engines And The FIA bidUnder the bodywork, Hydromax is driven by two production-based JCB hydrogen internal combustion engines tuned toward a combined 1,600 horsepower.