new Rad, cool running

[david nelson]

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? 

[Wrightpayne]

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.

[SLR No.77]

David, good to see you on Saturday.

Is it the same spec rad or upgraded? Anything else changed?

Stu.

[timb2117]

That IS cool David, is the thermostat in and working?

 

[OldAndrewE]

Also where is the oil temperature measured?

[Jonathan Kay]

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?

Thanks

Jonathan

[Jonathan Kay]

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

[Amos91]

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?

[TomB]

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.    

[Golf Juliet Tango]

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.

[Englishmaninwales]

What is the correct temperature thermostat for k series please? (Apologies for the thread hijack, David!)

Malcolm

[SLR No.77]

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.

[Jonathan Kay]

And Ratrace put an 82° thermostat in my 1800 K for road and occasional trackdays.

Jonathan

[Englishmaninwales]

Thanks

[david nelson]

I will try to answer your questions 

1. Original rad kept water temp in the 80's and oil temp was similar iirc

With a sigma rad temp dropped to water 70ish oil in the mid 60s

New k series rad from coolexperts

There have been no other changes. 

Thermalstat is what ever has been in for 18 years. No idea of the temp. 

[Nigel Riches]

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.

[ScottR400D]

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.