Building, racing, crashing race cars with the 750 Motor Club
As seems usual these days, I start with an apology. Since the last post I’ve been racing at both Cadwell and Doningon. It’s the usual excuse, I’ve just been too busy, although I did spend a welcome weekend tramping around the Peak District. All the same, despite the tardiness, I did go to Cadwell and Donington and completed four races without major mishap.
Wasn’t quick enough though…
Yet again, and extremely tiresomely, it’s time to set the car up for another race meeting. For some time now, I’ve been thinking about making it possible to mount a setup frame on the car, much like the one described in the Pashley book. Essentially this allows you to construct a rectangle around the car from which to take measurements to the wheels.
Time for the first track outing of the new season. I booked a track day with Bookatrack at the Rockingham circuit which isn’t too far away from us. I went to Rockingham many years ago in the Fury, when I was first learning to drive it. So, although I could just about remember the way round there wasn’t much in the way of knowledge; especially as the circuit we were using this time was different.
I managed to find a bit more time to get onto the car at the weekend. And, as you can see from the photo and jumping ahead a bit, I’ve got the car down on the ground and all the bodywork back on. Addmitedly I’ve now taken the bodywork off again but that’s in the nature of the racecar beast. Bloody hell, though, I’d forgotten how horrible the roll cage looks…
It’s Christmas Eve (I wish this time of year was still as magical as it was when I was a child) and I’m stretching out the time until Santa arrives by writing this post. Not that there’s much to write about to be honest.
With the engine in bits I could suspend my disappointment and get on with other things. First up is to sort the wishbones that I’ve been meaning to remake. This is to get rid of the Delrin bearings, which haven’t really worked, and hopefully to get a bit of weight out. So, making my usual MDF and bracket jigs I remade the rear upper wishbones, as seen here. You’re right, they’re awfully short (although you have to add a lot of length in the rod-ends to this photo) and this is what completely re-designing the rear of the car would have sorted. However, I just don’t have the time, especially as I’ve just got a new job. (As well as still teaching, this time to “Engineering Doctorate” students, up at York and my PhD viva being next week. Eeeek.)
I took the crank up to Andy yesterday to see what he thought. As I was beginning to suspect he reckoned that the #2 and #3 big end journals were toast. This is a real bugger, as you can’t get undersized shells and therefore can’t get the crank reground.
It’s getting perilously close to the next race but barring a bit of shouting, the car’s now done. I wonder if it will work properly?
I took it up to Andy’s last week and he modified the old exhaust system to fit to the new engine. I think it’s ended up being a bit of a bodge, to be honest, but with luck it will work well. I do keep wondering if I should have had a complete new system built.
Last weekend was the first of out visits to Snetterton this year. We were running on the 200 circuit which is pretty much the same sort of layout at the original circuit, albeit with the hairpin at Montreal which is huge shame after losing Sear and the left hander at Murray’s which is a replacement for the original Russell chicane. It’s a shame to lose the original Coram corner and, also, Jim Russell’s name from the circuit. The interesting bits of the new circuit are all on the 300 circuit, as I tested on earlier this year.
As discussed, I bit the bullet and remade some of the suspension components. First up is the rather short rear upper wishbone, as in the photo. It’s the iridescent white component. (I’ve got fed up using POR-15 which always goes a weird non-grey colour so I’ve decided to start spraying things like with rattle cans. As, oddly, Halfords don’t sell rattle cans for grey cars I settled on white as a decent light colour. Black would be nice but I’m paranoid about being able to see cracks appearing.