Four blade fan?

[Steve Jones]

My SWB Saloon with a very clean period type core runs a bit hot. It only ever boils the water in quite extreme conditions but it boils the petrol in the FZ float chamber at every opportunity. In contrast, my competition Ulster with a modern film core runs cool to the point that I run it without a fan belt but it still doesn't get as hot as I'd like. The Saloon does what it does whatever engine is in it (including an engine that runs cool in the Ulster) leading me to conclude that it's a radiator issue and, in addition, it can't cope with modern petrol. The modern core in the Ulster holds more water than the period type core in the Saloon so that has to be a factor as well.

Steve