Hi , yes very pleased with repower
conversion ford 418 xld 60HP@4400rpm - used at 3400rpm max 50HP) water
lock used for two reasons- on sterndrives conversion the exhaust
normally would go down about 3ft into water
through prop which is good silencer but lowers HP as restriction to flow and as it replaced a Mercruise v8 the riser height wasnt sufficient as conversion of cow horn exhaust
tubes removes the non return valves (2" outlet into welded plate on a 4" outlet) and as boat on tidal moorings on english
channel the tidal flow pretty fast and could back flow into engine
the original cow horn exhaust have been blanked off and the internal water pump removed from leg drive as new repower has jabsco
pump fitted to engine
The water lock has advantage of two things.
1 . visable exhaust water flow outlet with very low back pressure
2 . easy maintenance
for winter drain down or replacements
without boat removal
i used vetus 2" unit with vetus 2" exhaust hose no back pressure or flow problems.
have lots of tech data on project - in uk -sorry for delay in replies as time difference.