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#11
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Only problem w/ running an engine w/out a thermostat is you may never warm
the engine to proper temp and you may find the engine running rich all the time. This will cost you in fuel but won't hurt the engine (except for possibly carbon buildup over a long time). Won't hurt in terms of overheat as the max coolant is flowing all the time. If the engine overheats and warps something in this condition it would really overheat w/ a thermostat installed as a fully open thermostat adds a certain amount of restriction just due to the metal parts being there. -- Tony my boats and cars at http://t.thomas.home.mchsi.com - "Bowgus" wrote in message ... A suggestion ... don't run the engine very long without a thermostat ... even better, don't run without a thermostat at all. One of the thermostat's function I've been told is to ensure a relatively consistent engine temperature preventing parts warp etc.. Having said that, I had a thermostat fail closed on a Toyota. I removed it and drove home from ... interestingly enough Johnstown near where you're at ... to Ottawa without any apparent problems. I am going to try it this weekend with no thermostat and see what happens. Stay tuned ... |
#12
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You can run the engine without a thermostat, but it never gets up to normal
operating temperature and you get lots more wear, and worse fuel economy. I have had a thermostat stick open, winter time returning from Tahoe. No car problem, except for ice on the inside the windows, and we and the daughters, had on most of out heavy ski clothes. "Bowgus" wrote in message ... A suggestion ... don't run the engine very long without a thermostat ... even better, don't run without a thermostat at all. One of the thermostat's function I've been told is to ensure a relatively consistent engine temperature preventing parts warp etc.. Having said that, I had a thermostat fail closed on a Toyota. I removed it and drove home from ... interestingly enough Johnstown near where you're at ... to Ottawa without any apparent problems. I am going to try it this weekend with no thermostat and see what happens. Stay tuned ... |
#13
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It's not "overheat" or "underheat" ... it's "uneven heat" that (I was told)
may cause a problem ... it's ... one part of the engine is hot and one part of the engine is cold(er) than it should be because of the lack of temperature regulation provided by the thermostat. I myself will run my engines with the thermostat installed ... you guys can do (obviously) as you like :-) OT: My mercruiser thermostat is 140 F ... I myself find that unususual compared to an auto thermostat. My understanding ... an auto engine is most efficient around 235 F (achievable because the sytem is pressurized). So ... why the low temp for the marine (version) engine? "tony thomas" wrote in message newsz5qe.31276$x96.130@attbi_s72... Only problem w/ running an engine w/out a thermostat is you may never warm the engine to proper temp and you may find the engine running rich all the time. This will cost you in fuel but won't hurt the engine (except for possibly carbon buildup over a long time). Won't hurt in terms of overheat as the max coolant is flowing all the time. If the engine overheats and warps something in this condition it would really overheat w/ a thermostat installed as a fully open thermostat adds a certain amount of restriction just due to the metal parts being there. -- Tony my boats and cars at http://t.thomas.home.mchsi.com - "Bowgus" wrote in message ... A suggestion ... don't run the engine very long without a thermostat ... even better, don't run without a thermostat at all. One of the thermostat's function I've been told is to ensure a relatively consistent engine temperature preventing parts warp etc.. Having said that, I had a thermostat fail closed on a Toyota. I removed it and drove home from ... interestingly enough Johnstown near where you're at ... to Ottawa without any apparent problems. I am going to try it this weekend with no thermostat and see what happens. Stay tuned ... |
#14
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About the 140 F ... could it be because the manufacturer realizes that a
lotta boaters run their boats at WOT (= heat) ... whereas most :-) auto drivers don't? OT: had the boat out first time this year ... ran just fine ... an excellent day out. Too bad the weekend is not looking good ... we're looking forward to trailering down to Ivy Lea for the up to Gananoque, across and down the US side, around the castle, back to Ivy Lea loop ... and the islands just off Gananoque ... very nice. "Bowgus" wrote in message ... It's not "overheat" or "underheat" ... it's "uneven heat" that (I was told) may cause a problem ... it's ... one part of the engine is hot and one part of the engine is cold(er) than it should be because of the lack of temperature regulation provided by the thermostat. I myself will run my engines with the thermostat installed ... you guys can do (obviously) as you like :-) OT: My mercruiser thermostat is 140 F ... I myself find that unususual compared to an auto thermostat. My understanding ... an auto engine is most efficient around 235 F (achievable because the sytem is pressurized). So .... why the low temp for the marine (version) engine? "tony thomas" wrote in message newsz5qe.31276$x96.130@attbi_s72... Only problem w/ running an engine w/out a thermostat is you may never warm the engine to proper temp and you may find the engine running rich all the time. This will cost you in fuel but won't hurt the engine (except for possibly carbon buildup over a long time). Won't hurt in terms of overheat as the max coolant is flowing all the time. If the engine overheats and warps something in this condition it would really overheat w/ a thermostat installed as a fully open thermostat adds a certain amount of restriction just due to the metal parts being there. -- Tony my boats and cars at http://t.thomas.home.mchsi.com - "Bowgus" wrote in message ... A suggestion ... don't run the engine very long without a thermostat .... even better, don't run without a thermostat at all. One of the thermostat's function I've been told is to ensure a relatively consistent engine temperature preventing parts warp etc.. Having said that, I had a thermostat fail closed on a Toyota. I removed it and drove home from ... interestingly enough Johnstown near where you're at ... to Ottawa without any apparent problems. I am going to try it this weekend with no thermostat and see what happens. Stay tuned ... |
#15
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Just remembered ... here's my old beater under "Bowgus"
http://thebayguide.com/rec.boats/ ... if you should spot me down there in the 1000 Islands, gimme a shout :-) |
#16
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Don't forget on a closed (rad) system with antifreeze the boiling point is
substantially higher then raw water and no pressure. Also, most carb based cars ran 165's, wasn't until injection and pollution controls that the higher 185's etc came in. One trick to make more power from an injected engine is to run a 165 thermo and reprogram the computer to except that as 'closed loop' meaning fully warmed up. But it raises pollution. A boat could run as high as a 165, but to go to a 185 (with typical 10% variance) pushes it way to close to that magic 212 . Also, in an engine with a 165, areas around the heads can run up another 20d without the thermostat seeing that, thus the safety range. Mark, if the thermostat proves to be the culprit, don't run without it, replace it, they are only 8 bucks for a Chev and help not just mileage but lubrication and so on. Also pistons and other critical parts are sized to work best at a certain temperature.. Don't skip looking at the engine pump as I suggested a while back. If it is worn, the added restriction of a thermostat will cause your problem, removing that restriction isn't a fix, getting a pump that circulates the water correctly is. Look to the automotive side for the pump, same part (don't do so for starters, alternators etc, but pump is the same).. Greg "Bowgus" wrote in message news About the 140 F ... could it be because the manufacturer realizes that a lotta boaters run their boats at WOT (= heat) ... whereas most :-) auto drivers don't? OT: had the boat out first time this year ... ran just fine ... an excellent day out. Too bad the weekend is not looking good ... we're looking forward to trailering down to Ivy Lea for the up to Gananoque, across and down the US side, around the castle, back to Ivy Lea loop ... and the islands just off Gananoque ... very nice. "Bowgus" wrote in message ... It's not "overheat" or "underheat" ... it's "uneven heat" that (I was told) may cause a problem ... it's ... one part of the engine is hot and one part of the engine is cold(er) than it should be because of the lack of temperature regulation provided by the thermostat. I myself will run my engines with the thermostat installed ... you guys can do (obviously) as you like :-) OT: My mercruiser thermostat is 140 F ... I myself find that unususual compared to an auto thermostat. My understanding ... an auto engine is most efficient around 235 F (achievable because the sytem is pressurized). So ... why the low temp for the marine (version) engine? "tony thomas" wrote in message newsz5qe.31276$x96.130@attbi_s72... Only problem w/ running an engine w/out a thermostat is you may never warm the engine to proper temp and you may find the engine running rich all the time. This will cost you in fuel but won't hurt the engine (except for possibly carbon buildup over a long time). Won't hurt in terms of overheat as the max coolant is flowing all the time. If the engine overheats and warps something in this condition it would really overheat w/ a thermostat installed as a fully open thermostat adds a certain amount of restriction just due to the metal parts being there. -- Tony my boats and cars at http://t.thomas.home.mchsi.com - "Bowgus" wrote in message ... A suggestion ... don't run the engine very long without a thermostat ... even better, don't run without a thermostat at all. One of the thermostat's function I've been told is to ensure a relatively consistent engine temperature preventing parts warp etc.. Having said that, I had a thermostat fail closed on a Toyota. I removed it and drove home from ... interestingly enough Johnstown near where you're at ... to Ottawa without any apparent problems. I am going to try it this weekend with no thermostat and see what happens. Stay tuned ... |
#17
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"Bowgus" wrote in message ... It's not "overheat" or "underheat" ... it's "uneven heat" that (I was told) may cause a problem ... it's ... one part of the engine is hot and one part of the engine is cold(er) than it should be because of the lack of temperature regulation provided by the thermostat. I myself will run my engines with the thermostat installed ... you guys can do (obviously) as you like :-) OT: My mercruiser thermostat is 140 F ... I myself find that unususual compared to an auto thermostat. My understanding ... an auto engine is most efficient around 235 F (achievable because the sytem is pressurized). So ... why the low temp for the marine (version) engine? Because if a raw water cooled boat engine is run in salt water, then the salt will precipitate out and plug up the engine cooling passages at about 160 degrees. So they run a 140 as standard. My carbed 351W closed cooling ran a 160 thermostat. Do not know what the new 350 mpi runs. |
#18
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Yes ... just after I posted, the light went on that my raw water cooled boat
system is not a closed (pressurized) cooling system ... Don't forget on a closed (rad) system with antifreeze the boiling point is substantially higher then raw water and no pressure. Also, most carb based cars ran 165's, wasn't until injection and pollution controls that the higher 185's etc came in. |
#19
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Good info ... thanks
OT: My mercruiser thermostat is 140 F Because if a raw water cooled boat engine is run in salt water, then the salt will precipitate out and plug up the engine cooling passages at about 160 degrees. So they run a 140 as standard. My carbed 351W closed cooling ran a 160 thermostat. Do not know what the new 350 mpi runs. |
#20
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Contrary to some (and maybe good) recommendations, I ran for a bit with no
t'stat. Temperature varied upwards to 130 max depending on the rpm's, load, etc. Given I used to run normally from 145 to 165 (various conditions) I made an executive decision and bought a new t'stat and installed it. The engine temperature is now varying from 145 to 170. It is maybe 5 degrees higher than what I normally run/range (and the water is still quite cold, too cold for swimming (for me)), but I can now pull into a dock without the temperature going 200 (gauge limit) and having to go into neutral to rev. it up and cool it back down. I think the problem is now (hopefully or sort of) fixed, but I will be keeping a very close eye on it. There was a bit of crud laying on the old t'stat when I pulled it out, so maybe dirt was impeding the reliability of it opening, and/or maybe there is still another problem such as the outdrive water pump getting weak. Some great feedback and suggestions again everyone. Thank you. Should any new news develop, I will make sure I let everyone know. Bowgus, If you are doing the run from Boldt Castle back to Gan, make sure you do the Riff. It is a very samll passage between the Lake o' the Isle, going under the bridge between the US and Canadian Customs, and exiting into the Cdn channel near Ivy Lea. Other than the one boat width passage in some areas, the only other area you need to be careful around is the bottom end just off Lake o the Isle. I have a 268 Searay (YesDear) and can manouvre it through no problem, but would not take much larger of a boat through though. Mark (the rail & canopy hook guy) www.ripnet.com/vtf/prod03.htm "Bowgus" wrote in message news About the 140 F ... could it be because the manufacturer realizes that a lotta boaters run their boats at WOT (= heat) ... whereas most :-) auto drivers don't? OT: had the boat out first time this year ... ran just fine ... an excellent day out. Too bad the weekend is not looking good ... we're looking forward to trailering down to Ivy Lea for the up to Gananoque, across and down the US side, around the castle, back to Ivy Lea loop ... and the islands just off Gananoque ... very nice. "Bowgus" wrote in message ... It's not "overheat" or "underheat" ... it's "uneven heat" that (I was told) may cause a problem ... it's ... one part of the engine is hot and one part of the engine is cold(er) than it should be because of the lack of temperature regulation provided by the thermostat. I myself will run my engines with the thermostat installed ... you guys can do (obviously) as you like :-) OT: My mercruiser thermostat is 140 F ... I myself find that unususual compared to an auto thermostat. My understanding ... an auto engine is most efficient around 235 F (achievable because the sytem is pressurized). So ... why the low temp for the marine (version) engine? "tony thomas" wrote in message newsz5qe.31276$x96.130@attbi_s72... Only problem w/ running an engine w/out a thermostat is you may never warm the engine to proper temp and you may find the engine running rich all the time. This will cost you in fuel but won't hurt the engine (except for possibly carbon buildup over a long time). Won't hurt in terms of overheat as the max coolant is flowing all the time. If the engine overheats and warps something in this condition it would really overheat w/ a thermostat installed as a fully open thermostat adds a certain amount of restriction just due to the metal parts being there. -- Tony my boats and cars at http://t.thomas.home.mchsi.com - "Bowgus" wrote in message ... A suggestion ... don't run the engine very long without a thermostat ... even better, don't run without a thermostat at all. One of the thermostat's function I've been told is to ensure a relatively consistent engine temperature preventing parts warp etc.. Having said that, I had a thermostat fail closed on a Toyota. I removed it and drove home from ... interestingly enough Johnstown near where you're at ... to Ottawa without any apparent problems. I am going to try it this weekend with no thermostat and see what happens. Stay tuned ... |
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