flatback90 Posted November 23, 2009 Share Posted November 23, 2009 quite a few(me incuded) of us out here run our caburated 2 stroke outboards without thermostats and that got me wondering if it would do any harm to the general running of my 200tdi?? i think it doesnt matter on the two strokes because of the way they are lubricated but i have a suspicion that the oil in my 200tdi needs to be at a certain temperature to work properly? Quote Link to comment Share on other sites More sharing options...
western Posted November 23, 2009 Share Posted November 23, 2009 it will run far to cool, leave the stat in place it should be a 88degree stat. tdi's run cool anyway, but without a stat it won't get to full working temp. Quote Link to comment Share on other sites More sharing options...
flatback90 Posted November 23, 2009 Author Share Posted November 23, 2009 thats got me thinking now western.. my landy parts supplier here says that i should have an 83deg stat so thats what i fitted. but after reading this thread and the one in the defender forum i'm notsure i have the right one Quote Link to comment Share on other sites More sharing options...
western Posted November 23, 2009 Share Posted November 23, 2009 all 200tdi should be fitted with a 88, the older TD engine could have a 82, matbe he's getting the engines mixed up. Quote Link to comment Share on other sites More sharing options...
flatback90 Posted November 23, 2009 Author Share Posted November 23, 2009 possible he is so i 'll talk to him tommorrow. that might make the heater a little warmer Quote Link to comment Share on other sites More sharing options...
landkeeper Posted November 23, 2009 Share Posted November 23, 2009 6 degrees Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted November 23, 2009 Share Posted November 23, 2009 I've heard it said that the head needs the restriction of the stat to achieve water pressure in the head & prevent steam pockets forming. This can lead to hot spots and possibly cavitation damage. When I've suffered a dead stat and had to run without I've cut the centre out and refitted the remains to at least provide some restriction. Quote Link to comment Share on other sites More sharing options...
oddballrovers Posted November 23, 2009 Share Posted November 23, 2009 I've heard it said that the head needs the restriction of the stat to achieve water pressure in the head & prevent steam pockets forming. This can lead to hot spots and possibly cavitation damage. When I've suffered a dead stat and had to run without I've cut the centre out and refitted the remains to at least provide some restriction. Hi Fridge You are spot on, thats why F1 engines are restricted to ( at one time) 3,5 bar coling system presure. So one puts in the stat and make shure the system runs the right presure or more than recommended never less. Kind regards Ole Quote Link to comment Share on other sites More sharing options...
****inthemud Posted November 24, 2009 Share Posted November 24, 2009 I ran my defender 200 without a stat for a few months, i think i was experiencing other problems anyway at the time. However it doesnt prove to be a good idea as you end up recirculating hot water round a hot engine. particularly when working it real hard. It gets a chance to cool in the rad when the stat closes up. Quote Link to comment Share on other sites More sharing options...
Troddenmasses Posted November 24, 2009 Share Posted November 24, 2009 I ran my defender 200 without a stat for a few months, i think i was experiencing other problems anyway at the time. However it doesnt prove to be a good idea as you end up recirculating hot water round a hot engine. particularly when working it real hard. It gets a chance to cool in the rad when the stat closes up. I thought that it was the other way around. It starts closed, so circulates the water around the engine until it is up to temperature - when it opens and releases the water to the radiator - allowing it to be cooled. Without a thermostat at all, it is just uncontrolled wide open, so will never really get up to a proper working temperature. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted November 24, 2009 Share Posted November 24, 2009 I think the issue is that with no restriction, the water flows so quickly through the rad it doesn't get enough time to dump heat and hence, although it will be overcooled to start with, you have less cooling available if you manage to work it hard, at which point it may actually overheat faster. Quote Link to comment Share on other sites More sharing options...
Daan Posted November 24, 2009 Share Posted November 24, 2009 In my very humble opinion, I reckon that removing the thermostat will provide a choice to the waterflow, through the rad or recirculating through the engine (as if the thermostat were closed), so the waterflow will choose the easyest way, with overheating as a result. Quote Link to comment Share on other sites More sharing options...
Ex Member Posted November 24, 2009 Share Posted November 24, 2009 Yes, keep in mind that on THESE engines, the thermostat also CLOSES flow to the bypass line when open, forcing flow through the radiator. Without a thermostat the water won't be forced through the rad. Quote Link to comment Share on other sites More sharing options...
flatback90 Posted November 24, 2009 Author Share Posted November 24, 2009 thanks for the replies lads looks like i will be leaving it in then! Quote Link to comment Share on other sites More sharing options...
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