jad Posted November 9, 2010 Share Posted November 9, 2010 My dad and I have been building a 200tdi 80 inch trialler/possible winch vehicle from a disco 1. We have put the radiator right at the very back and we have extended the oil cooling pipes for the engine to it. It has been suggested that this may make it a very long time for the oil pressure to build up. Does anyone have any experience of this or knwo the how the oil circulates around the engine? I would have throught that engine oil would be picked up from the sump (obviously) and then used to lubricate the engine which would then be put through the filter to take out any carp picked up by it and and put through the oil cooler when it is hottest and fed back into the sump. This would make me think that there would not be any oil pressure problems, but i could always be wrong..... Basically I want to know if we are gonna bugger the engine? Thanks for your help Jad Quote Link to comment Share on other sites More sharing options...
LandyManLuke Posted November 9, 2010 Share Posted November 9, 2010 FWIW, a friend has been building a challenge truck with a 300tdi and a rear rad, and he's using the built in oil cooler. It has no problems at all getting, or maintaining, oil pressure. The radiator is on the low pressure (after the engine) side of the circuit, and isn't even in circuit all the time - the oil thermostate means the radiator is only in circuit when the oil is hot enough. Quote Link to comment Share on other sites More sharing options...
cackshifter Posted November 10, 2010 Share Posted November 10, 2010 And oil doesn't compress very much at all, so getting pressure generally shouldn't be a problem anyway, but you may find oil changes are a bit difficult; either the oil comes out and it takes an age to refill ('cause now it's full of air) or it doesn't drain and you have a load of dirty oil left.Having remote drain & fill points seems extreme but I can't think of another solution to that one. How would you get the oil after it had been in the engine, as normally it just drips back to the sump? Nigel Quote Link to comment Share on other sites More sharing options...
dirtyninety Posted November 10, 2010 Share Posted November 10, 2010 I have a 80 200tdi with rear radiator! i will watch this with interest!! Quote Link to comment Share on other sites More sharing options...
jad Posted November 10, 2010 Author Share Posted November 10, 2010 FWIW, a friend has been building a challenge truck with a 300tdi and a rear rad, and he's using the built in oil cooler. It has no problems at all getting, or maintaining, oil pressure. The radiator is on the low pressure (after the engine) side of the circuit, and isn't even in circuit all the time - the oil thermostate means the radiator is only in circuit when the oil is hot enough. Thats good to hear. thanks for the response And oil doesn't compress very much at all, so getting pressure generally shouldn't be a problem anyway, but you may find oil changes are a bit difficult; either the oil comes out and it takes an age to refill ('cause now it's full of air) or it doesn't drain and you have a load of dirty oil left.Having remote drain & fill points seems extreme but I can't think of another solution to that one. How would you get the oil after it had been in the engine, as normally it just drips back to the sump? Nigel thats isnt too much of a problem, its not a road going vehicle so it can be left to drain. I dont think we will worry about dirty oil being left in the pipes. we can move them about to help with the oil pipes around a bit to help it drain. I have a 80 200tdi with rear radiator! i will watch this with interest!! You say you are gonna watch this.... If you have one how long have you had it? what do you do with it? any had any problems? Also does anyone know if the 200 has a thermostat for the engine oil as standard? cheers Jad Quote Link to comment Share on other sites More sharing options...
LandyManLuke Posted November 10, 2010 Share Posted November 10, 2010 Also does anyone know if the 200 has a thermostat for the engine oil as standard? It does, in the Oil Filter housing, very close to where the oil pressure switch screws in. Quote Link to comment Share on other sites More sharing options...
Phil Hancock Posted November 10, 2010 Share Posted November 10, 2010 Std oil circuit is. Sump, oil pump, filter, cooler(if hot enough), engine brgs, sump. Quote Link to comment Share on other sites More sharing options...
jad Posted November 10, 2010 Author Share Posted November 10, 2010 Std oil circuit is. Sump, oil pump, filter, cooler(if hot enough), engine brgs, sump. so your saying that the oil goes through the cooler before it goes through the engine? so its in the high pressure side? and having the oil cooler in the rear could cause oil pressure problems? Quote Link to comment Share on other sites More sharing options...
western Posted November 10, 2010 Share Posted November 10, 2010 the oil thermostat will only open if the oil temp is above 74 degrees then it allows the flow to go via the oil cooler. Quote Link to comment Share on other sites More sharing options...
jil6939 Posted November 11, 2010 Share Posted November 11, 2010 I run a 300 tdi disco tray back with the water radiator in the back and i removed the engine oil cooler by using a short bypass hose by the oil filter. Never given me any problems in not having a cooler but it is a good motor. It might be different if your motor is well used. Quote Link to comment Share on other sites More sharing options...
Phil Hancock Posted November 11, 2010 Share Posted November 11, 2010 Yes the cooler is in the pressure side cos there is no piped non pressure. If you are worried that the length of the pipe runs will cause a pressure drop when the thermo opens to send the oil thro the cooler then up the hoses/pipes a size with reducers to connect at each end. I.E. replace the 1/2" hoses with 5/8", the oil pressure might take slightly longer to get to operating pressure at start up. Quote Link to comment Share on other sites More sharing options...
nicks90 Posted November 12, 2010 Share Posted November 12, 2010 if you are really concerned about it then dont use the oil cooler in the radiator and buy a small oil cooler for the engine bay. plenty of cheap used coolers on ebay from saabs and stuff. You could even fit a small leccy fan from a motorbike for if the oil gets to a certain temp - like 85C - to be doubly sure. Quote Link to comment Share on other sites More sharing options...
Phil Hancock Posted November 12, 2010 Share Posted November 12, 2010 if you are really concerned about it then dont use the oil cooler in the radiator and buy a small oil cooler for the engine bay. plenty of cheap used coolers on ebay from saabs and stuff. You could even fit a small leccy fan from a motorbike for if the oil gets to a certain temp - like 85C - to be doubly sure. A variation on that idea would be to fit a heat exchanger in the rad to water pump inlet at the engine end. Quote Link to comment Share on other sites More sharing options...
dirtyninety Posted November 12, 2010 Share Posted November 12, 2010 or run it without an oil cooler? Quote Link to comment Share on other sites More sharing options...
jil6939 Posted November 13, 2010 Share Posted November 13, 2010 KISS Quote Link to comment Share on other sites More sharing options...
FLR100 Posted November 13, 2010 Share Posted November 13, 2010 or run it without an oil cooler? I run without an oil cooler with no probs but if you are concearned simply plumb a small one in the engine bay(saves a load of pipework), also if running a rad in the rear you are better off not useing a tdi rad and going for something larger like a v8 one which is a full lenght jobby which is going to give you far more cooling efficiency as you will need as much as you can get due to restricted airflow, i'm currently running a ali freelander one as it saves a fair bit of weight if that's an issue for you, good luck with it Quote Link to comment Share on other sites More sharing options...
jad Posted November 13, 2010 Author Share Posted November 13, 2010 I run without an oil cooler with no probs but if you are concearned simply plumb a small one in the engine bay(saves a load of pipework), also if running a rad in the rear you are better off not useing a tdi rad and going for something larger like a v8 one which is a full lenght jobby which is going to give you far more cooling efficiency as you will need as much as you can get due to restricted airflow, i'm currently running a ali freelander one as it saves a fair bit of weight if that's an issue for you, good luck with it that wont be a problem. were using a tdi rad. there hugely overcooled anyway, there is gonna be so much water in the system as well. I think we will just leave the oil cooler plumbed into the back, its there now..... Quote Link to comment Share on other sites More sharing options...
FLR100 Posted November 14, 2010 Share Posted November 14, 2010 I thought that but it takes a little longer for it to get up to temprature but once it does it seems to take longer to cool it all you can do is suck it and see Quote Link to comment Share on other sites More sharing options...
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