RS Motorsport :: Classic Speed Restored

After signs of overheating I...
Pulled the head apart and cleaned it all again, the head gasket showed no signs of having leaked etc. Performed a valve regrind and installed new valve stem seals. I think I actually did the rockers up properly this time but time will tell.

Replaced the water pump, plumbed the heater back into the back of the block, blocked off the inlet manifold though Im thinking this will provide a dead spot for hot water and the efi sensor will be affected??

Had a 3 core made up with a thermo fan switch welded in. its all painted a nice colour of black, which is a change compared to the black and copper it was. The tanks had to be streached a bit to suit the new core but all is fine. And by shopping around and pulling a few favours all the cooling system done for less than 200 bucks.


Tested it with a new thermometer, "calibrated on the stove", to determine if the temp gauge works. It idles at 91 degrees, thermo kicks in at 86 but doesnt seem to turn off unless power is removed once it is cooler than 86???
Gauge works well and acurate up to 180 degreen F but after that gets a bit wayward, can be about 20 degrees off at points. It does read hot at the top end which confirms your suspicions regarding the overheating.
Any suggestions on a brand of gauge to replace it with??

However the whole lot seems to idle hotter than it did before despite everything being new. What timing should it be set at idle?

Well to the track to test it all.

JP

Hi,

Have just registered so need time to check how everything works, but ;

also had overheating and found several things. 1 - thermostat in back to front (oops). 2. - corrosion in block reducing heat transfer. fixed with Nulon cooling system flush.

3. RUNNING LEAN on 1 cylinder. I could not pick it, but I have some very interesting thermographic images that show up to 50C variation in exh temps @ 3500rpm with no load, and the variation increased with revs. Would overheat even at idle with bonnet open and aluminium radiator and 12" thermo fan. I tried best to eliminate leak even though I could not pick it up by ear, balance gauge, or rev change AND FAILED. Using mates $100000 (yes thats right) camera we fixed the balance and temp dropped below 180F and stayed there no matter what.

Will try to post when I have time.