That was all done before driving it

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1970 MK2 Cooper S

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"Show me the Mini!"

Would you like to explain more

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1970 MK2 Cooper S

Did you get the radiator stripped and cleaned? My radiator is a stock Mini K/ Cooper S one, never overheats. With or without the Minimatic heater. Runs an 82C thermostat.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

The car wasnt getting hot before the engine work
I did find 2 little chunks of rubbish in the cores and back flushed it all before i fitted it all back
I wonder if some rubbish has come out of the block/ head and into the radiator
I also have a new temp sender here so i might fit it and see if it changes things

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1970 MK2 Cooper S

Use an infrared thermometer to check temp of thermostat housing at running temp.
Backflush will not clear blocked cores, I'd take it to a rad shop for a tank off cleanout. Expensive but works.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

So the timing or the mixture may not be right...both can cause overheating....distributors can be worn and wander around, and carbies can be worn or not set up properly (e.g. main jet not centred correctly)..

Just saying, OK?

Once you have fully overhauled the cooling system and you still have a problem then it might become clear (maybe)

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"Show me the Mini!"

First step is check your gauge. Put a kettle close enough to the car that you can put the sender in. Then boil the kettle and watch your gauge. If you have a thermometer in the kettle even better. You may as well test both senders while you are at it. (Remember to disconnect your coil).

As Doc mentioned an infrared thermometer is a handy tool too. You can get cheap ones on eBay.

The other think to consider is the old original voltage regulators can play up effect the standard gauge. This could be causing a false reading.

Mine is 1330 with a stock original radiator. I had the top and bottom tanks removed and the core cleaned out. Still gets quite hot on a hot day if stuck in traffic but has never boiled. Temp also rises a little climbing a long hill. Always returns to normal once moving.


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68 Morris Cooper S Mk1 (*ex 78 1275 LS 4th last built, 70 Morris 1500 OHC & 70 MiniMatic)

well i tested the thermostat and it works fine
changed the temp sender and it still reads high
Checked air flow through the radiator and there is plenty
I checked the carbs mixture and it was a little rich if anything
I also looked at the PCV valve and felt it was letting too much air into the manifold
So it looks like a radiator clean
Was quoted $160 to do this
not much dearer for a whole new radiator
But i might do it myself as i am familiar with soldering in this fashion

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1970 MK2 Cooper S

Not all new radiators are created equal.
The original Oz Mini one with 3 cores and 16 fins (gills)/inch is pretty good. UK super 2 core cools about the same. Some UK 3 cores- not so good.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

What temp is "high"?

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68 Morris Cooper S Mk1 (*ex 78 1275 LS 4th last built, 70 Morris 1500 OHC & 70 MiniMatic)

about 2/3 to 3/4 on the gauge
When it used to run just under 1/2
So something has changed
I wounder if after fitting the 266ss cam i might need to change the needle size to richen it up at high speed

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1970 MK2 Cooper S

"I wounder if after fitting the 266ss cam i might need to change the needle size to richen it up at high speed"

I wonder if you have wound it up too much.

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The bitterness of poor quality (or Crappy Workmanship) remains LONG AFTER the Sweet Taste of Low Price is forgotten.

If it used to run "just under half" that means it used to run "below normal" which is not ideal.

It now is just above normal.

Whatever the reason for the change my preference would be for the temp to be above normal rather than below. It's not good for a motor and oil to be running too cool.

If you still haven't tested how the gauge reads you are still guessing. The difference may be less than 10deg?

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68 Morris Cooper S Mk1 (*ex 78 1275 LS 4th last built, 70 Morris 1500 OHC & 70 MiniMatic)

Anything over 70C is fine. I d be more worried if it's running too hot.
Try another thermostat....

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.