The current cooling solution is the (hopefully!) final evolution of lots of experimentation with various different ways.

This uses a pair of modified second hand mini radiators as you can see below, An aftermarket fan was used on the left radiator due to the limited clearance as it is close to the oil filter, the original Alfa one is a perfect fit for the radiator on the right hand side.

The left radiator has had a bleed point installed on a blanking plate that I soldered on after I cut off the filler neck. This was bought from a plumbing supplier for £1.

The right radiator also had the filler neck cut off and replaced with a blanking plate with an upper connection for the header tank.

I then repainted them with some Hammerite I had lying around.

Brackets were made out of 2" aluminium L-section on either side of the rads, bolted onto the bulkhead and the engine compartment frame at the top and the ends of the framehead on each inner bottom edge.

The radiators are connected in series using 28mm copper pipe, this is convenient to use as elbows are readily available from plumbing suppliers. I have used the standard 1" bore inlets and outlets on the radiators and mini rubber hose on these to connect to the copper pipe, the end result is a neat and cost effective system!

I was going to just try this system to see how effective it was, fully expecting to have to fit some ducting in afterwards and maybe use the fans until then. In fact, the radiators have proved more than up to the job of cooling this engine and I haven't even used the fans yet!

The fans are controlled with an aftermarket switch which is a probe that is fitted between the tubes of the matrix, I have fitted this at the inlet to the first radiator (hottest part), the switch is set to close the contacts within it at 82 degrees, there is also an override switch that I can operate manually on the dash.

I also recently moved the radiator fan switch. It is an aftermarket one designed to fit between the fins in the radiator and activates the fans once it reaches 82 degrees, the problem was that at speed the wind was cooling the switch too much and I was seeing the temperature rise up to 95 degrees on one occasion without the fans turning on. My solution was to solder the switch into one of the cooling pipes, this now works much better and I can forget about it now.