After taking a couple of days off due to bad weather (I am stripping the discovery outside), I was straight back to it. I intended to remove the radiator at the same time as the heater box since they are part of the same system, but it seems the radiator also cools the engine and the transmission oil, evidenced by the oils feed lines on either side of the radiator. It is really quite an interesting system, I’ll take some photos of it when I remove it. I noticed that the vanes on the rear of the radiator are badly corroded or missing, so unfortunately I will have to throw the radiator away.
Anyway, it was a relatively simple job to remove the heater box as the Disco’ doesn’t have air-conditioning (or the associated piping/systems). After draining the radiator and the header tank of coolant (I left as much coolant in the engine as I could as it prevents corrosion), I disconnected the heater pipes that travel through the firewall, removed 5 bolts and some drain tubes from the heater box and it pulled free with a bit of a tug. Here is a picture, without the heater box:
And a picture of the box on my floor:
If anyone wants a heater box and blower unit from a non-air conditioned 1998 Discovery, get in touch.
I also took time to go and see how Tomcat were getting on with my frame. It turns out that they are quite busy so thus far have only stripped the parts from the chassis and they have cut 10 inches or so from the rear (as well as some extraneous bracketry). They have also been busy fabricating the pipework for my frame, I thought there would be more progress than this, but I’m glad that there isn’t as it gives me more time to get things ready before the frame comes back. I took the opportunity whilst I was there to discuss with Paul which springs and dampers would be best. I settled on Pro-comp ES9000 dampers front and rear (because they are cheap, I can upgrade to Fox dampers at a later date) and some dual-rate springs that Tomcat themselves use. The spring rates are roughly centred around 175lbf/inch (or 79.4kg/inch), which is pretty low for a car that will eventually weigh 1300-1400kg.
As a quick comparison, a typical eco-boost Formula Ford might have 700lbf/inch (317.5kg/inch) springs on the rear of the car, with 500lbf/inch (227.5kg/inch) springs on the front (total car weight is around 475kg). What this tells you is the suspension will have a very high frequency, i.e. it will react very quickly to any given input (road bump). and the suspension travel will be very small. In real world terms the ride will be very firm and jarring.
Given the same bump, the Tomcat will have to use more suspension travel to equilibrate the input than the formula ford will. But this extra travel allows the unsprung mass (everything that is not suspended by the spring; wheels, brake disc, brake caliper etc.) to accelerate at a slower rate and hence reduces the force that is transmitted into the car. Therefore, the Tomcat will have a softer ride than a Formula Ford. Obviously this is a very simplified explanation, vehicle dynamics is the second most complicated thing to mathematically model (aerodynamics being the most complicated thing), and no-one reading this will probably want to see that.
Anyway, side track over, here are some pictures I took whilst at Tomcat:
A pile of spare parts, which includes; brake calipers, axles, diffs, radius arms and half shafts.
The bare chassis and start of the frame.
The sawn off (torched off) rear section of the chassis.
Next time, Electrics.
(Also I will produce a longer update with more pictures.)