[Redmerlin]

Steve 0 / rogerspeed

Thanks for your advice , Yes I do understand that the 2600 spider is massively overcooled, designed to run hours on end at 100mph in 100F plus temperatures. The oustide temp here in the UK is about 50 -60F (10-15C) - So clearly well cooled - after a run I can put my hand flat on the rocker cover and hold it there with no burning ! which suggests no more than 140F (60C).

The only problem with this is if I fully cover the radiator there is no obvious change in indicated temperature.

I too suspect the thermostat - the car has been stored for 10 years and it may have failed open - so far I have been unable to remove it , till I can find a 1 9/16 inch ( or 40mm ) socket

Just for the record

Temp senders give the following

On bench

Water temp sender at 50F (10C) gives 2.20 Kohms , in close to boiling water 200F gives .492 kohms

In car

Water temp sender in stone cold car gives 2.55 kohms in warm car 1.54 kohms - on a linear scale this is approx 120F - so the gauge is probably working

Voltage to gauges is only 11.3 volts that seems low

Thanks for your help

I'll report back on the thermostat swap. If this fails its on to the pyrometer ( my hand was cheaper)

Cheers

Ian