Tunnel Vision

It's been about a million years since I've posted an update. To be fair, I've started a few posts (like this one), but not finished that section so held off posting. As a general update, progress has been very slow. I've been waiting for bits and generally stumped. There was soooo much I wanted to get done over the Xmas break, but in reality pretty much nothing happened. As a way to get things moving again, I visited the Road Track Race factory to check out a 99% complete Mevabusa that they had there. It was a very useful trip, and as always the staff there were very helpful (thanks Harry and Pete), who patiently answered my raft of imbecilic questions and let me take about a petabyte of photos. Anyway, work has started again...

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I thought I'd start work on the tunnel/centre console today while I was waiting for other bits. As per most things, I hadn't really a clue about what to do or where to start so I started with listing everything that I thought needed to go in the tunnel, so far I've come up with.

• Hot and cold water pipes
• Small pipe (don't know what this is for yet)
• Wiring loom
• Handbrake & cables
• Rear brake cables
• Clutch cable
• Throttle cable

That's quite a bit of stuff to cram in. There were a couple of pieces of criteria that I wanted to adhere to also. Firstly I wanted the tunnel to be easily removable, so nothing should be attached to the outer tunnel shell. Secondly, I wanted the tunnel to be flush with the floor. This might sound obvious but looking at pictures of other people's builds and some have it raised off the floor sitting on top the chassis. Having it raised is easier, you don't have to cut it around the chassis and you get 2.5cm more space in there.

The lower shelf

Part 1
I had a good think about how to approach it, what brackets to make and so forth. I decided to cut out a shelf which sits on the centre part of the chassis, this would allow me to fix other brackets and also attach the pipes to it directly.

The mock tunnel. I was careful to watch out for X-Wings

I had some off cuts of aluminium from the floor, so I made a 100cm long strip. I had some P-clips to fasten the pipes but I was wary that when the tunnel cover was in place that it wouldn't fit over the pipes so I made a mock up.

This showed that even without flexing the tunnel the pipes and P-clips would fit, held by a single bolt in the centre. Now it was time to put it in place.

The hot and cold pipes in place (sort of, they need to
move forward a little bit, but good enough for now)

It was easier than expected, I thought that I'd need octopus fingers to get the P-clips and the pipes together via a single screw but it wasn't too bad. This way I could use the same screws that I used to hold the shelf in place to hold the P-clips also (I don't know why I'm insisting on capitalising P-clips, the P is the same shape whether it's caps or not!).

Part 2
I held off doing any more work until I had the handbrake as depending on how that fitted, things might have to change. It's a good job I did as things need to change.

The problem was that the handbrake is about 2mm too wide to fit between the pipes. I thought about modifying the handbrake but it wasn't ideal and there was great scope for me needing to buy a new handbrake if I did that. I can't really move the pipes a little bit either way either because the frame is quite narrow, so a rethink was on the cards.

The solution was to mount the pipes vertically rather than horizontally, so I needed a bracket to do this. I settled on some 70mm right-angled brackets and then boggled on how best to fit the 3 P-clips together to fit in the space without crossing the centre line.

The mock bracket showing the P-Clip layout. The middle
hole on the bottom of the bracket is what attaches to the
middle of the shelf.

The solution was to attach one large P-clip and the smaller one to the bracket and the third would be attached to the shelf, but at different intervals so that the bits of rubber weren't fighting for space against each other.

This worked well when it was assembled and there was just enough room. The only adjustment I need to make is to get smaller bolts as the 15mm ones I was using stick out too far and foul the tunnel housing, so I'll get some 5mm ones which should do the trick.

The three pipes in place with the handbrake.

I tried the handbrake in place and it fits along the centreline also which is ideal, although it's not in it's final resting place, it proves that it'll fit there.

So that's one side of the tunnel done, the other side will use the same angle brackets but as it's 'softer' cables running there, it'll cope with going around the handbrake a bit easier.