Effect Of The Engine Speed And Loading On The Heat Transfer Within Exhaust Valves Mahfoudh Cerdoun, Bouziane Farsaoui, Smail Khalfallah, Rafik Lankri and Carlo Carcasci E3S Web Conf., 128 (2019) 01001 Published online: 08 November 2019 DOI: 10.1051/e3sconf/201912801001