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  1. #1
    Join Date
    Nov 2006
    Location
    lakewood, ca, usa
    Posts
    352

    Default Proper size raw water inlet hose

    Twin 350 crusaders 1966. My boat is raw water cooled 100% the thermostats have been bypassed for decades because they are no longer available. Currently the thermostat housings being used has a 1-1/4 inch hose from the raw water pump. The correct thermostat housing for my intake manifold has been found and arrived. The raw water hose is 1 inch. Will the 1/4 inch reduction in hose size cause an issue. Itís about a 15 inch long run.

  2. #2
    Join Date
    Mar 2009
    Location
    Dresden, Maine, United States
    Posts
    353

    Default Re: Proper size raw water inlet hose

    I can't answer the question but have one of my own. What temps are you running without the thermostats? Thanks in advance and have a very merry Christmas season.

  3. #3
    Join Date
    Mar 2009
    Location
    Portland, Oregon,
    Posts
    10,997

    Default Re: Proper size raw water inlet hose

    A few pictures would be very helpful.

    FYI...... you should be running with a proper temperature range thermostat installed as to control operating temperature.
    Too cold is not good!
    Rick ... aka Ricardo..... AQ series Volvo Penta repair
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP drives

    "Intellectual growth should commence at birth and cease only at death." Albert Einstein

    Please... no PMs! Post your questions on the forum.

  4. #4
    Join Date
    Sep 2008
    Location
    Maryland - USA
    Posts
    7,771

    Default Re: Proper size raw water inlet hose

    Unless you plan to run WOT a lot, you should be fine with 15" of the smaller hose...

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