I'll bite ... my mercruiser thermostat is 140 F ... lower than an automotive
thermostat ... the manifolds/risers/exhaust are water cooled ... much cooler
than an auto exhaust ... water pressures are no greater than in an auto
engine ... I would use automotive cooling lines on the fresh water side.
Salt water side ... no comment.

"Edward Greeley" wrote in message
...
Gentlemen (and ladies if you have any comments):

Does anyone know of any "real world" reasons why automotive-type,
corrugated flexible hoses should not be used to replace unavailable or
ridiculously expensive OEM molded hoses in marine engine cooling
applications, i.e.:

A. On the fresh water (antifreeze) side of a heat exchanger cooled engine?
B. On the sea water (salt water) side of the same cooling system?

Please, folks, I'm asking for VALID reasons why the automotive hoses
should NOT be used, not non-specific comments like: "Well, the XYZ
company must have had SOME reason for not using those hoses."

Your comments, advice, or experience with this will be appreciated!

Thank you,
Ed Greeley