MogLite Posted September 29, 2006 Share Posted September 29, 2006 Well it isn't much of a system TBH As a reminder Transit radiator - rear mounted 2 x Cosworth fans - sucking X-eng 2-setting switch in the bottom rad hose tee from bottom rad hose to standard expansion tank No heater or associated hoses VDO sender in stock position on V8 intake manifold VDO gauge matched to sender Yes I know the rad could be considered a little on the small side Yes I know adding more water to the system by plumbing in a heater/2nd rad would help But before I re-design I'd like to make sense of what I've got. Whilst shaking down at Seven Sisters I was seeing a running temp of approx 100C - which in September is a little hot for my liking. When it went to 105 - the second fan would kick in from the x-eng switch I though 105 was too warm for the 2nd fan to be kicking in, and I'd like it to run much cooler than that. Fridge asked a pertinent question > Where is your fan switch fitted relative to your temp gauge sender? > Remember those switches have a 5-15deg hysteresis between off and > on so > it's not going to switch at exactly the same temp. > J _ Hysteresis - good word :-) The temperature sender is in the stock position in the V8 intake manifold - its VDO to match the gauge. The fan switch is an X-eng jobbie in the bottom radiator hose. I'm assuming that the water flow is pumped "out of the top of the water pump" into the top of the rad Out of the bottom of the rad Past the x-eng fan switch Back into the block Assuming the gauge and fan switch are accurate. The 2nd fan comes on at about 105C Yet the X-eng switch switches the fan on at 92C (13 degree difference across the rad with one fan on) I'm thinking it doesn't matter what temp the water comes out of the block (within reason) it's the temp that it goes back into the block - ie to show the rad is doing its job ? So I could re-position the temp gauge sender to the bottom of the rad pipe ? Or I could stop panicing about 105-110C on the temperature gauge because I know its in the wrong place and it is therefore reading at least 13degrees high (possibly more with the 2nd fan kicked in) True ? Quote Link to comment Share on other sites More sharing options...
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