Sorry for the long delay since the last update, life has been busy and expensive recently, so haven’t had much time to progress. Still here we go with some updates.
The original Spitfire radiator was all sorted via a third party well over a year ago now so it’s all pressure tested and ready for use. I need to make some new fixings and mounts for a cooling fan as the fitment will be nothing like the original setup and mounted into the chassis in a totally different position location. The fan itself is seriously overkill for the application, however I got it a good while back from a mate for only £25 and will certainly be sufficient for the job… and I have learnt from my Cobra build it is better to be over effective rather than under. I started off making four brackets, from 2mm alloy that will wrap round the side of the radiator, these will be held with some cotton/rubber bobbins through the original side m6 fixings. These rubber mounts will also act as vibration absorbing for the radiator on the chassis brackets (that still need welding on) so reduce the risk of fracturing the radiator.
The four brackets are fairly straightforward to fabricate and we’re all made in a cardboard template first. Once in the metal they fitted perfectly and have been painted up to look good. I am a tad concerned about the size off the cooling fan and the lack of natural air flow getting restricted through the radiator.. however with me converting to a thermostatic switch control this should allow hours of stationary running the engine (without natural air flow) and the fan will kick in and out accordingly.. and as mentioned before, it’s pushing significantly more air than required as it really is much bigger than requirements for the job in hand.
Next I have to carefully plan the side fixing plate which will be welded to the front of the chassis leg. This is simply drilled to accept the other stud of the rubber M6 mounts and then bolted on with some nylock bolts. Once I had both sides mounted I had to start planning and measuring up the fixing point on the front of the chassis legs. When I was happy with the positioning I marked up where the right angles of the brackets located. So first off I intended to weld these brackets on, however this would not allow future removal of the radiator for whatever reason. I considered fitting a few rivnuts either side so I could bolt the brackets to the chassis legs….. however access for the drill and setting tool for the rivnuts was impossible so a new plan was needed.
I used some off cuts of 6mm steel bar to create a plate that could be welded onto the chassis legs, however these plates would have two M8 studs welded on to then allow me to bolt the brackets on from the front nose cone. You can see pictured below one of the new stud brackets fitted to the radiator bracket for the offside.
With these two stud brackets fitted it was back to marking and measuring up the welding position on then chassis. I started to weld them into place, however I ran out of gas for my welder so I just did a few tack welds to hold as opposed to lots of pigeon shit welds that would not hold. I’ll have to come back and finish these welds off along with tarting it all up and making it look pretty, however the plan of removal for maintenance was working fairly well.
I was able to pop the full radiator and fan application into position now, and I’m fairly pleased with how it all looks. Access from behind to fit the coolant pipes will be straightforward and access to the front bolts for the brackets is also fairly easy. I will have to revise my front grill idea now as I also need to make this removable to access all of this should I need too.
I intend to get a header/expansion tank that will be fitted to the bulkhead which will now be the high point within the cooling system to help it bleed and circulate nicely. This will be fitted with a pressure cap of the correct value and also a cap on the original radiator with a higher pressure release value as a reserve contingency just in case.
Im happy with how this has gone and although the radiator is fixed extremely well I’m also considering adding a support bar from the top of the radiator side brackets back onto the chassis tower mounts just to belt and braces everything really, when the system is full it could be a little top heavy on the fixing studs so they will beef everything up. I have some metal bits ready but will have to wait for welding gas again now.
I have a few other bits on the go, but cant update you on those bits until they are done and again they will need gas for the welder… sit tight for another update soon!
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