JimDay Posted December 17, 2014 Share Posted December 17, 2014 Hi my son is trying to purchase a radiator for his 200Tdi Disco & the motor factors need to know if a single or double pass anyone any idea what this means ???? Quote Link to comment Share on other sites More sharing options...
Team Idris Posted December 17, 2014 Share Posted December 17, 2014 Yes, single pass means the water goes into one tank, through the tubes to the other. Each tank has a hose connection. Double pass has two tanks, but one tank has both the pipes. (this tank is divided in two by a soldered in plate) Why? The double pass behaves like a radiator half as wide, but twice as long. The water has to go twice as fast so it is naturally more turbulent in the tubes and passes its heat energy to the tubes easier. Down side is that it takes more pumping. I guess they tested and found the benefits of double pass worked well with a landy engine Quote Link to comment Share on other sites More sharing options...
miketomcat Posted December 17, 2014 Share Posted December 17, 2014 I fairly sure 200tdi (89 to 94) is single pass though there is only one radiator for the 200tdi. The 300tdi (94 to I think 98) is double pass though again there is only one radiator for the 300tdi but 200 and 300 are definitely different. Mike Quote Link to comment Share on other sites More sharing options...
JimDay Posted December 17, 2014 Author Share Posted December 17, 2014 Cheers guy's. The guy in the motor factors said the double pass is no longer available anyway. Just had a look & the top hose is passengers side and bottom hose is on the opposite sides of the rad so guess that's a single pass rad then where as my 300Tdi the hoses are both on the passengers side making it a double pass rad have I got that right Quote Link to comment Share on other sites More sharing options...
miketomcat Posted December 17, 2014 Share Posted December 17, 2014 Yes that's right mind i've never seen a double pass on a 200tdi so I don't know what radiator has been discontinued. Mike Quote Link to comment Share on other sites More sharing options...
JimDay Posted December 17, 2014 Author Share Posted December 17, 2014 Cheers Mike unless it was a double pass on the early V8 engines I don't know not been into Disco's that long was always into Fords originally Jim Quote Link to comment Share on other sites More sharing options...
miketomcat Posted December 18, 2014 Share Posted December 18, 2014 Good point forgot about V8 though that's a different radiator to the diesels as it's bigger anyway (no intercooler). Mike Quote Link to comment Share on other sites More sharing options...
qwakers Posted December 19, 2014 Share Posted December 19, 2014 I 'think' its a double pass on the 2.0 mpi Quote Link to comment Share on other sites More sharing options...
rrr47 Posted December 19, 2014 Share Posted December 19, 2014 2.0 Mpi, I have only ever seen one of those. Quote Link to comment Share on other sites More sharing options...
miketomcat Posted December 19, 2014 Share Posted December 19, 2014 I'm really not doing well forgot the mpi as well though I've never seen one let alone been under the bonnet. Mike Quote Link to comment Share on other sites More sharing options...
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