... carried out by supplying biogas through filtering chamber which contains rust of iron or diatomite 1.3 Biogas engines In Vietnam, the engine which uses biogas as a fuel can be the biogas engines imported ... composition in biogas fuel changes, cross section of biogas supplying pipe should be changed - For ZH1115 biogas engine with original air supply pipe, the equivalent diameter of biogas supplying ... diesel engine to a spark ignition biogas engine 3 - Manufacturing the biogas fuel system - Doing experiments on the Froude dynamometer to access influence of biogas composition, compression ratio...