Its been a while since the last update but i have been chipping away at this project. I finished the weldathon on that bus and it was picked up the next day. The owner is really happy with my work and it turns out he has quite a collection of classics. He now wants to bring me some of the cars, including a mk1 mini cooper, for some rust work. Cool!
While the bus was taking up space I had been sneaking in some work on the wee Imp. I fitted the engine up to the transaxle, weighing the engine first. 87kg with the flywheel in place. Not too bad at all. Not super light like the standard Imp all alloy unit however I have moved so much stuff to the front that it should still be well balanced. I do love the idea of an all alloy Nissan cg13 twink from a K11 Micra- however that would require a full re-certification. I prefer the idea of a Goldwing engine engine more!
I digress. So anyway- I had slung the engine in place using a lump of timber and a ratchet strap. Worked fine. Then started making new engine mounts and cross member. I was not happy with the state or look of the old one and knew it could be far better. Not really a lot to say about making fabricating it all- the usual story of lining the engine up exactly central and building things to connect. I wanted to make sure that the exhaust manifold and starter could be easily removed without touching the cradle. I probably over built it with extra bracing (I even ended up adding extra gussets just before painting it, because ocd paranoia) but all up it still only weighed in at around 7-8kg.
In photos. I didn't take many as work progressed on this bit really quickly..
Clearance under the car was still really good, considering how low the sump looks from the back. I think an optical illusion due to the rear panel not being in place.
Then painted in black epoxy..
Next up was the exhaust. The manifold that came fitted was running really close to the drive shaft! Enough that it would contact when the car was lifted off the ground.
There was quite a bit of damage, dents, poor welds and other bits that needed attention so I chopped it all back and carefully shortened the bottom pipes then systematically pieced it back together. I required quite a bit of forward thinking because the access to weld to pipes all the way round was really tight. No photos of work though as I was so immersed in the
process I forgot to take some. Really happy with the result though. Fits perfectly, cleaner runs and still equal length (as if a Datsun A12 with a carb the size of a small cup would care. But hey, every little helps )
Later on I painted it and then wrapped the upper pipes to ward off heat from the inlet and coolant pipe. I know some don't like heat wrap but I think its great! Its worked well on my last several car builds. Luckily I live in a dry enough area to get away with it and not worry about potential corrosion.
With that sorted I moved onto the rest of the system. I have always had a picture in my mind of what I wanted it to look like and I wanted it to be rear slung with a side exit to avoid the car filling with exhaust fumes. Apparantly these early Imps with the roof vents can suffer from fumes being pulled into the car by the vacuum. I also had a rough idea on how I would build my own silencer and there wasnt anything available that fitted my ideas with a price I liked.
I had built one for the Mazda Rx3 and it worked well. Money is tight (I'm too tight..), time is plenty and I love making things so I started building. Using the pipe from the original straight through muffler..
Then fabricating my silencer using some ideas I nicked from Google along with extensive coffee fueled airflow thinking in my mind. I have no idea on what it will sound like but it was a fun process and looks neat. The stainless pads worked well in my last muffler along with some glass matting I got from the neighbour. I'll report back
In photos...
I had a pipe bent to 90 degrees and added mount points to the muffler so it slings up under the rear valance. I made a stainless heat shield to deflect heat away from paint and bottom pulley. You'll see that later. I have yet to decide on the length of the exhaust tip, cut it and then weld it on to finish.
Then the inlet. Because the Datsun engine sits flat in this Imp, unlike the rear sloping angle in its usual Datsun 1200 home, the carb is not level. I chopped off the mounting face and milled the manifold at angle to suit. Then I welded it back in place. Carb is now level. I filled in an unused vac hole, cut off the extra unused lugs and gave the whole thing a clean up till it was nice and smooth.
While I was playing with alloy I made a new alternator bracket...
and had to rebuild a very corroded thermostat outlet. it was knackered...
I was given a better spare by a nice fella with a Datsun 1200 ute but it pointed upwards. My outlet, most likely from a van, points down and suits the pipework routing I wanted to do. So I had to fix it. I found a suitable piece of alloy pipe on an old scooter handle I had rescued from the local scrap metal pile at the dump...
Much better!
Then onto the pipe work in the back...
Just a case of sussing out a neat route to suit my tastes, remain easy to work on and remove and allowing for a potential Davies Craig electric water pump just in case the Datsun pump is not up to the task (and also because I do rather fancy the geekiness of the little display unit not to mention how much better it could work)
With the pipes sorted I replaced the transaxle output seals because well, for $20 it made sense to do them now. I machined up a stepped tool to make sure they went in straight and to the correct depth. New seals..
Then mounted the brand new BMW couplings I bought from Rockauto. I had to make some spacers to suit as they are narrower then the stock Rotoflex couplings. With the car on the ground the driveshafts sit almost bang on parallel to the ground which is good for their longevity. I didn't fancy reusing the red Nolathane couplings that came with the race car because whilst strong in shear and rotation they didn't have much flex in and out which would impose quite large stress on the transaxle casing as the rear suspension went through its motion I felt.
I then did some fun little jobs (but its all fun really..) like cleaning and painting the starter and alternator...
I dug out my old art oil paints and mixed up a suitable orange to paint the inside of a very faded rear indicator lens. It'll do for now but I do look forward to locating and buying some better ones when I go to Blighty in July!
Then began the wiring! Like all my other previous car projects, I enjoy this part immensely. I love the challenge of hiding as much of the wires away, re-configuring the circuits to suit add ons or just to make them better. In the case of the Imp, which has no fuses fitted at all (until the later mk3 Imps came along) this was an essential item to address.
It also has a terrible dash wiring layout whereby you have to unplug everything to remove the instruments. Almost everything seems to run off just one piddly feed wire coming from the key. I'll sort that lot out with some plugs.
Add in some relays for the lights, fan. Wires for a potential electric pump, sound system, high stop lamp (I have a neat idea floating about in my head for that) and making sure its future proof because later on I would like to inject this engine. I have also added in a tail to attach a trailer plug to. Because that will be a thing
So I had two extra looms going spare which I pulled apart. I now had a large amount of extra wires for my project. Wiring isn't the most exciting thing to take photos of. I have now finished the engine bay wiring and I'm pretty happy with it. Now I've refitted the rear valance panel and exhaust and can lower the car down and start on the interior wiring. I'll be making a removable fuse box/relay unit and fit it under the dash if all goes well.
Some photos of where I'm at now...log burner in use as the nights get colder.
Sofa wheeled over to middle of workshop for max stereo imaging whilst I drink beer and play with wires...
Wires hanging from engine bay..
Engine bay completed (missing hose clip noted..) but for an over flow tank from header tank to fit. I will build a better two part tank in the future I think. Exhaust tip length yet to be decided and cut. Note stainless heat shield. Bumper also to go back on, with bottom mounted rego plate.
