david nelson Posted May 16, 2022 Share Posted May 16, 2022 Change my Rad and now have lower water temp (70 degrees) and oil temp (60 degrees)For me its running too cool. what options do i have?I could blank off some of the noise cone , reducing flow and other thought? Link to comment Share on other sites More sharing options...
Wrightpayne Posted May 16, 2022 Share Posted May 16, 2022 I my youth (80's) I remember dad had a cut piece of hardboard that slotted into the end plates of his Marina radiator in the winter.Point is I think something attached to the rad will be more effective at blocking flow. Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted May 16, 2022 Leadership Team Share Posted May 16, 2022 David, good to see you on Saturday.Is it the same spec rad or upgraded? Anything else changed?Stu. Link to comment Share on other sites More sharing options...
timb2117 Posted May 16, 2022 Share Posted May 16, 2022 That IS cool David, is the thermostat in and working? Link to comment Share on other sites More sharing options...
OldAndrewE Posted May 16, 2022 Share Posted May 16, 2022 Also where is the oil temperature measured? Link to comment Share on other sites More sharing options...
Jonathan Kay Posted May 16, 2022 Share Posted May 16, 2022 Same questions and one more:What else has changed?What's the specified temperature of the thermostat?At what temperature does the fan cut in?ThanksJonathan Link to comment Share on other sites More sharing options...
Jonathan Kay Posted May 16, 2022 Share Posted May 16, 2022 I think that we're hearing of many more Sevens running cool than used to be the case. Especially K series, and including mine.There's a fair bit on blinds in the archives... and one Member has one that can be controlled from the cockpit.Jonathan Link to comment Share on other sites More sharing options...
Amos91 Posted May 16, 2022 Share Posted May 16, 2022 I've noticed this too with my Sigma, need to be either stationary or at motorway speeds to see the oil up to 80C whilst the coolant is lower, around 70C.From looking at the Caterham site, the thermostat is 74C, so if you have good airflow you're not going to see temps sit much above this when moving at pace. Might have to look at an 80C stat or something.Where is the thermostat located on the Sigma, is it in the coolant block near the waterpump? Link to comment Share on other sites More sharing options...
TomB Posted May 16, 2022 Share Posted May 16, 2022 Ive had this on my 1.8k when I went from an old copper Covrad triple pass to a new Radtec standard road radiator- the new rad was so much better at cooling than the old one, despite it not a being triple pass rad. in the end, I found some ali sheet and blanked off about a 1/3rd of the rad, secured with ali foil tape. Link to comment Share on other sites More sharing options...
Area Representative Golf Juliet Tango Posted May 16, 2022 Area Representative Share Posted May 16, 2022 David, in winter I use a sheet of plastic sheet behind the grille to keep the temperature of the Crossflow up (and make sure some heat comes through to the driver. Link to comment Share on other sites More sharing options...
Englishmaninwales Posted May 16, 2022 Share Posted May 16, 2022 What is the correct temperature thermostat for k series please? (Apologies for the thread hijack, David!)Malcolm Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted May 16, 2022 Leadership Team Share Posted May 16, 2022 Mine is fitted with an 82 deg stat which seems to suit the higher performance engines well especially when pressing on. When I bought the car it had a 74 deg stat which was plain bonkers and it just didn't get up to temperature. As standard they are 88 degs.Stu. Link to comment Share on other sites More sharing options...
Jonathan Kay Posted May 16, 2022 Share Posted May 16, 2022 And Ratrace put an 82° thermostat in my 1800 K for road and occasional trackdays.Jonathan Link to comment Share on other sites More sharing options...
Englishmaninwales Posted May 16, 2022 Share Posted May 16, 2022 Thanks Link to comment Share on other sites More sharing options...
david nelson Posted May 16, 2022 Author Share Posted May 16, 2022 I will try to answer your questions 1. Original rad kept water temp in the 80's and oil temp was similar iircWith a sigma rad temp dropped to water 70ish oil in the mid 60sNew k series rad from coolexpertsThere have been no other changes. Thermalstat is what ever has been in for 18 years. No idea of the temp. Link to comment Share on other sites More sharing options...
Nigel Riches Posted May 17, 2022 Share Posted May 17, 2022 The temp. of a thermostat is the "cracking" point, where it starts to open, the full open temp. will be 10 to 14 degrees higher, or should be on a properly functioning unit. Link to comment Share on other sites More sharing options...
ScottR400D Posted May 17, 2022 Share Posted May 17, 2022 Nigel, I would agree with that on a well designed system but, certainly in my experience, 7s have a system that will overcool and so the 'running temperature' is often close to the stat opening temperature. My car has an 82c stat and the car warms up to that then hovers around 81/82. Give it a good blast soon after warming up, or after a longish run at low revs, and it will drop to 75/80 before gradually climbing back up. Running fairly hard for a long period it stays around 81/82.It seems to me that during steady road running, the stat hovers around closed/slightly open and that gives the rad time to bring down the temperature in the rad and hoses giving this short term drop when next revved hard and the stat opens more. Link to comment Share on other sites More sharing options...
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