Marcos Maniacs

Steve,

I think we are at risk of getting our wires crossed.

There is little or no point in copying the Marcos 3L Volvo radiator if running a Ford V6 engine, even though the original Marcos radiator for the Ford 3L V6 was notoriously ineffective in keeping the coolant temperature down in hot conditions. The picture shows the engine bay of a wood chassis 3L V6.

There is no filler cap on the 3L Volvo radiator because

(a) there is not enough headroom between the top of the radiator and the underside of the bonnet and

(b) because on the Marcos 3L Volvo a header tank was fitted alongside the engine and the filler pressure cap was on the header tank.

The aluminium radiator works well.

It was made by Radtec in the UK;

http://www.radtec.co.uk/

The configuration of the chassis mounting framework on the 3L Volvo Marcos is totally different from the 3L V6 and on the Volvo engined car the radiator is held in place with four captive engineering screws that are built into the radiator framework. I have not worked on a 3L V6 Marcos so cannot comment on how the radiator is held in place.

I will send details of the radiator measurement later when I have the time to get in the garage and check.

If you are building your own cooling system then it would make sense to install a closed system.

On the early Marcos cars the cooling systems vented to air so if the pressure cap opened coolant would be lost through the overflow pipe rather than reclaimed as in a closed system.

Regards

David