Jim, the guru is trapped in Urop by the evil Icelandic dust so I have time to try and plan the engine exhaust system. From the measurements, I will need a 20"dry insulated riser, with the cooling water injected on the down side.
These are the measurements on TIH.
These are the recommendations from the Vernalift website;
(diagram courtesy of Centek Ind.)
Obviously I have to watch out for excessive back pressure. Any advice welcome.