Hot water temp..

[Paul bow]

Hi guys my freshly rebuilt S2 seems to run hotter than I would like .. it sits even when cruising on the L of normal.
It’s fitted with a Radtec ally rad and fans and water wetter so was hoping for a cooler cat.!
Tried 2 gauges and sensors so wondering if maybe an air lock in the system.. any ideas how to bleed that out?
Fans kick in at 90degrees, sounds a bit late to me I would have thought 85 might b better ?
Cheers guys

[mgcjag]

What temperature is the car actually running at...try an infared reader on the manifold...voltage stabiliser?..thermostat....have you checked its operating temperature and timing and mixture....Steve

[Paul bow]

Hi Steve.. so IR thermometer on the rubber top hose reads 70 and similar at the housing, it runs an ecu which controls the fan which cones in at 90 deg, this is a separate sensor to the one which reads to the temperature gauge in the dash..
Reading up on other posts it seems these gauges are unreliable.
I thought that the IR gun was faulty as when the fans come on at 90, the temperature at the housing reads low 70’s.. but confusing tbh

[Paul bow]

Forgot to say voltage stabiliser new..
An airlock I thought but I don’t really fully understand why that wouldn’t bleed itself out running with the rad cap off ?

[mgcjag]

Hi Paul....you need to work out is your car actually running hot...or is the guage not accurate....these guages as we know arnt accurate...they dont give an exact tempetature..they are just a guide really......a new voltage stabiser dosnt mean that its working correctly....and your thermostat what temp is it and is it opening/ closing at its rated temp.....air lock shouldnt be a problem really..heater set to hot....do you still have an air bleed from thermostat houseing to radiator as per standard S2......Steve

[Paul bow]

Yes still have the air bleed Steve .. had to modify as it’s a Jenvey manifold but it’s still there.. can’t remember the thermo rating have to check old receipts, but I’m with you on the only a guide issue, unreliable readings .. think I’ll get it checked out with some more professional diagnosis when it returns to Northampton motorsport .. cheers Steve

[mgcjag]

Jenvey manifold.....so have you fitted the S2 thermostat houseing and still have bypass and standard type S2 thermostat.....Steve

[Paul bow]

Hi Steve sorry for the late response ..
Yes I kept the original thermostat housing in a Jenvey manifold … I know what your thinking, that dont fit, well yes you’d be right but u didn’t realise that the Jenvey manifold is longer in length in the water rail and so the thermostat housing now sits so further forward that upon shutting the bonnet it left a nice new power bulge in the new freshly painted bonnet !!!
So I chopped off about 14mm from the top of the housing,welded the hole shut and tapped a thread into the side of the housing, tapped a thread onto the old outlet pipe and I’m pleased to say it works well.
It’s easier to see the pics below to see how I got around it, it now has a decent 10mm clearance.

[mgcjag]

Hi Paul....i thought with the Jenvey manifold you use the S1 houseing and thermostat?......Steve

[Paul bow]

Well that as maybe Steve.. barratt and Jenvey told me for the S2 there was no adaption but Jenvey and barratt were working on one together.
I sent Peter the tech guy at barrat the adaption as he had been most helpful in trying to come up with a solution, he reckoned that was a good and easy way to solve the issue on the clearence.
However..
Tbh at this stage of the build I was not about to embark on a different cooling system the S1 rad and s2 are completely different as you know, it was far easier to just adapt what I had, any air in the system bleeds out the same way as it would have before .. and took only a few hours to do, which for me was key ..

[politeperson]

Sorry to hear about the paint!

I am pretty sure you can just fit the thermostat without the center section?


Series 2 with a Jenvey manifold standard TBs and original style Rad

Series 2 with a Jenvey manifold standard TBs and a Radtec rad (much better)

Series One Jenvey Heritage throttle bodies with a Radtec Rad