--- In [email protected], Steve Wood <st...@...> wrote: > > I have a custom-made heat exchanger fitted onto the exhaust of the > air-cooled Lister HR2 on Bream, used to produce domestic hot water. The > heat exchanger has 11 pipes of 1/2" or 1" diameter and the rest of the > exhaust is the standard 2" diameter so the total cross-section area is > actually greater in the heat exchanger but clearly there is resistance > caused by the baffle where the pipes start (if this description isn't > clear think of a steam train, it's quite a similar concept.) > > It has been suggested that problems we are seeing with the engine are > caused by back pressure due to reduced effective diameter. There is loss > of oil from pretty much every orifice of the engine, typically a pint a > day. Its not labouring or losing power, though the engine room is very > hot as the cooling air is not ducted out. Oil pressure is steady at > 20psi, which is normal. > > The question is, is it the heat exchanger causing the problem, or the > lack of ducting, or is more likely to be something else altogether? > Thoughts anyone? > > Steve > NB Bream
Steve, I trust you have already had a good go at any crankcase breather(s) the engine may have. Tony Brooks
