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Closed circuit cooling of Interceptor 289 |
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grant1266 
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Joined: March-31-2014 Location: Auckland New Ze Status: Offline Points: 6 |
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 Topic: Closed circuit cooling of Interceptor 289Posted: June-16-2014 at 1:52am |
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I am wanting some info on converting 289 interceptor to a closed circuit cooling system with a heat exchanger does any one have any info or photos of this set up or tech manuals particularly with water pumps.
Thanks Grant |
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G McCauley
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: June-16-2014 at 10:03pm |
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Grant,
You are going to do some engineering on this one. Manufacturers make the kits but they do not supply a schematic specific to the engine. The first thing I'd check is to see if your engine has a circ pump. That's used to pump through the secondary circuit. The RWP pumps through the primary circuit. |
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grant1266
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Posted: June-16-2014 at 10:18pm |
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Hi thanks for response, there is no circulation pump but can get one from what I have seen on web, the plumbing to the exhaust seems interesting as there are two ports on each exhaust!
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G McCauley
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JoeinNY
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Joined: October-19-2005 Location: United States Status: Offline Points: 5698 |
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Posted: June-19-2014 at 4:53pm |
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You might want to consider converting the engine over to a different marinzation package in whole or in part. Even with closed cooling the salt water runs through the exhaust manifolds and the aluminum interceptors don't like it very much.
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: June-19-2014 at 9:54pm |
There are actually two systems available. The complete system includes the exhaust manifolds. The only problem with this is the tube and shell heat exchanger is pretty big. If I were doing it, I'd not go with the tube and shell but rather with a brazed plate since they are so compact. A fine strainer on the raw water is needed. |
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TRBenj
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Posted: June-19-2014 at 10:19pm |
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Even the full systems dump salt water back into the risers/elbows, no? Last I checked, the interceptor elbows were made of some alloy consisting of aluminum and unobtainium.
I too, would convert to a different marinization package if running in salt. |
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: June-19-2014 at 10:39pm |
Yes, the raw water is dumped into the risers/elbows but at least the manifolds themselves are protected. There are problems with closed cooling with the heat exchange. Running a glycol, the heat exchange can be 30% less efficient. On a older engine, this may be a problem since they were never designed for it. I too feel a different engine may be the best option. |
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grant1266
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Posted: June-19-2014 at 11:13pm |
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I am properly only going to run it in salt once or twice a year all other running is in fresh water, I would thought putting a heat exchanger on it would stabilise the temperature fluctuations which help with running when I ran it briefly before stripping it down then engine temperature was ranging up and down from 100-170 with raw cooling.
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G McCauley
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8122pbrainard
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Posted: June-20-2014 at 7:34am |
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Grant,
If you are only going to run it in salt once or twice a year, the mods are not wort the effort. Just flush it on the hose after you run the salt. I wish you had mentioned the frequency from the start of the thread!  The temp variance does need some looking into. Keep in mind these older marininized engine took some time to warm up. Do check out your T stat. Is there one in the engine? |
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grant1266
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Posted: June-20-2014 at 7:40am |
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Really don't like salt water through the motor, and yes has a T stat but haven't check it yet only driven it once before starting reno
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G McCauley
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ArtCozier
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Joined: April-25-2012 Location: Orlando FL Status: Offline Points: 1023 |
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Posted: June-20-2014 at 12:00pm |
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Better yet than flushing the engine with a freshwater hose, if possible, drop by a freshwater lake on your way home from the saltwater trip and run it around a few laps. Much more thorough flush than with a hose. Also let some water in the boat to rinse out the bilges.
What think you, Pete? |
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"Art"
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grant1266
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Posted: June-20-2014 at 4:55pm |
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Unfortunately closet lake over an hour away!
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G McCauley
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JoeinNY wrote: