J1928_202002 Devices Providing Backfire Flame Control for Gasoline Engines in Marine Applications

Engine manufacturers reported that larger plastic intake plenum chambers on fuel injected engines were not able to withstand the pressure wave, nor did they consistently pass due to the high velocity gas flow, during the test explosion when tested on the engine. When SAE J1928 was written, engines used carburators and the entire intake manifold contained flammable mixture. In modern fuel injected engines, only a small portion of the intake assemble could contain a flammable mixture. After careful consideration of the evolution in engine design, the committee reversed the changes made to 5.4.5.2.1 in the June 2018 edition, and returned the language to the July 2005 edition.