I have set up a heat exchanger
(Bowman brand, from the UK; you just have to like it - it feels so nice and solid and heavily built) to convert my 36HP Bukh diesel
from raw water
to fresh water cooling
. But I have to make a few choices - and welcome opinions on any or all of them.
A) Ideal Coolant
manufacturer's manual specifies the range of 160F - 200F for factory supplied cooling
system (mine is third party custom).
At first I thought, go for the middle of this range. But then, a warmer engine
is better for efficient and clean burning, so why not 200F? But is that a good idea in the long run (or for a long run) ... are there disadvantages to a higher engine temp setting?
B) Ideal Coolant
I also have to select a radiator cap for my coolant reservoir, and this cap will have a pressure relief rating. Manufacturer's manual is silent about this. Any recommendations for this rating?
(I am using an electrical
circulation pump - Johnson magnetic drive)
C) Ideal Sequencing of Impeller Pump and Heat Exchanger
I can place the heat exchanger before or after the raw water
impeller pump. I thought, better to place it AFTER the pump. That way, the heat exchanger is not on the suction side and so I avoid air leaks
, and it may be easier to spot water leaks
(trickling out). But, there could be negatives ...
All opinions appreciated.