BillK2632
Well-Known Member
My Cobalt has a Volvo Penta V8-300 (GM 5.7), it's a 2014 and has catalytic converters in the risers. I have also gone by the old school thought that risers temp should be 110-120deg and you can generally lay your hand on them - my old Mercruiser they were down right cool sometimes, but those were not catalyst engines. My Volvo Penta, the risers run a good bit hotter, not burning hot, but hot to the touch - 135-140deg at idle - engine temp 160. I am assuming risers with a catalytic converter run hotter?