rptruman Posted May 31, 2019 Share Posted May 31, 2019 Apologies if this subject has been done to death however, I’m struggling to visualise the fitment of the QED thermostat into my R300.Despite a third of my rad being covered and unless ambient temp is 15 degrees or above and I drive it like I stole it, I never achieve the 82 degrees my rad fan kicks in at.I decided that a QED thermostat housing would be a good idea as the car is without a thermostat at the moment and I’m concerned about the constant heat cycling going on when not achieving a stable running temp.So, thermostat in hand I’m looking at the metal water rail running over the primaries and parallel to the rocker cover, wondering how on earth is this going to fit.The clearance of the rail to the rocker cover looks too small, the length of the rail available looks too short to accommodate the housing and QED suggested additional hose lengths due to the rail fixture to the head. Also is a it a good idea to run the additional lengths of flexible hose over the primaries?Has anybody fitted a QED thermostat to an R300 that could share pictures and wisdom with me?Thank you. Link to comment Share on other sites More sharing options...
CageyH Posted May 31, 2019 Share Posted May 31, 2019 I thought it went in the coolant hose from the water rail to the radiator top inlet. Link to comment Share on other sites More sharing options...
CageyH Posted May 31, 2019 Share Posted May 31, 2019 Fitting instructions are here - https://qedmotorsport.co.uk/files/k-series_qed_remote_thermostat_fitting.pdf Link to comment Share on other sites More sharing options...
CageyH Posted May 31, 2019 Share Posted May 31, 2019 More info here - https://www.lotus7.club/forum/techtalk/qed-remote-thermostat-install Link to comment Share on other sites More sharing options...
rptruman Posted May 31, 2019 Author Share Posted May 31, 2019 Thank you CageyH, this sheet was included in the parcel from QED, but does not clear up my questions! Link to comment Share on other sites More sharing options...
rptruman Posted May 31, 2019 Author Share Posted May 31, 2019 I think you may be correct and that does make more sense. That would mean that the enclosed instructions and picture of thermostat placement is utter rubbish! Link to comment Share on other sites More sharing options...
Paul Mason Posted May 31, 2019 Share Posted May 31, 2019 Mine is definitely the n the middle of the hose from water rail to rad. About parallel with the centre line of the n/s/f wheel Link to comment Share on other sites More sharing options...
CageyH Posted May 31, 2019 Share Posted May 31, 2019 The picture is of an engine in either something like a Rover 200 or an Elise/MGF that have a bulkhead. Link to comment Share on other sites More sharing options...
CageyH Posted May 31, 2019 Share Posted May 31, 2019 This may help - https://www.lotus7.club/forum/techtalk/top-hose-thermostat-housing-k-series Link to comment Share on other sites More sharing options...
Englishmaninwales Posted June 2, 2019 Share Posted June 2, 2019 The last post in the link above suggests modifying a submarine pipe to have two outlets, with the bypass from the remote stat connected - no need to do that, just fit a T in the header tank to submarine hose (not header tank to inlet manifold) and connect the bypass to that. Works fine on mine for the last 10 years. (I made the T up from copper plumbing components).Malcolm Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted June 2, 2019 Leadership Team Share Posted June 2, 2019 "I decided that a QED thermostat housing would be a good idea as the car is without a thermostat at the moment"Why not just fit a thermostat in the existing thermostat housing?Stu. Link to comment Share on other sites More sharing options...
Area Representative Golf Juliet Tango Posted June 2, 2019 Area Representative Share Posted June 2, 2019 An indirect response, trying to look at any cooling issues rather than answering your question (apologies for that).One option is to go to the archive and read "Modifying the K Series Coolant Circuit" by Ian Blakeman in Low Flying September 2012 Link to comment Share on other sites More sharing options...
samsul Posted July 19 Share Posted July 19 Hi, did you solve the overcooling? What was the issue? Link to comment Share on other sites More sharing options...
jackb_ms Posted July 27 Share Posted July 27 In my case of over cooling, fitting the QED unit sorted the over cooling. I want to test an external remote thermostat; I have one you can borough. It has a slight weep this is why I changed it to a QED one. Jack Link to comment Share on other sites More sharing options...
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