Thanks for the comments guys, means a lot to me.
February update
This month I have been mostly focusing on getting the engine and its ancillaries in place. All the little adjustments I need to do to get it to fit. As I mentioned in my previous post the main culprits were the oil sump and the throttle body position. Before I started on them though I finished off the gearbox mount/cross brace.
Im quite happy with how this turned out, I done it pretty much free-hand, not really following a plan. I added 2 curved pieces of box to what I had done in the previous update then put in a couple more box for strength.
Once I box the chassis rails I will be adding gussets to make it a bit stronger, should do the trick though.
I was still juggling in my head with what to do to the air manifold. In my last update I mentioned about making an extension piece. That opened up a bit of discussion with others about how it would effect the engine. The main thing I would have felt was a very slight delay in response, which logically it would but I don't think it would have been so noticeable, probably more so if I was building a race car or track car. Anyway, in the end, after some more measuring and laying out of the seat plan I found out that even the extension coming out of the side would still interfere with some bits so that hit a brick wall.
As I was thinking of how to overcome the problem I made a start on the sump. The steering centre link was interfering with the front of the sump so I removed the sump then measured how far back the centre link came and found I needed to take 44mm off the front of the sump. It was also pretty close to the top of the sump flange so I had to bring the cut out off the sump right to the top.
Here is how it looked when I took it off the van.
(some of the more astute of you will notice I have actually already cut it
๐ )
I marked a line across, 44mm from the centre of the front bolt hole and cut it with the grinded then used a piece of thin card to make a template for the new metal.
I put the sump in the caustic tank at work to help remove the remaining oil and give it a bit of a clean. Then I removed the paint from around the edge of where I will be welding and neatend the cut up. I cut out my templated piece of steel and tacked it into position.
I also tacked the sump to the work table to try and minimise distortion.
Then I got around to welding it. I used my Tig for this one. The benefits were good penetration meaning it would be sealed and a bit of a neater weld to tidy up. Also because I haven't used the Tig in a while and thought it would be fun.
Gave it a nice bit of a tidy with the flap disc in the grinder and it turned out quite nice.
I also filled it up with water and left it over night to see if anything would leak out and by jove, it all remained in the sump with no leaks, good stuff.
I temporarily put it bank in place.
And attached the centre link, right now at the minimum it has given me 15mm clearance above and 30mm clearance behind, should do the trick.
Ok, so, the next hurdle that I had to overcome was the air manifold. As I said already, the extension piece was a no starter. The only real alternative was to block the old throttle body flange and make a new one on the top. I done a fair bit of research and looked up how to weld aluminium as I haven't actually done that before. Unfortunately my Tig is DC only which means I would have to use my Mig for it.
I came up with a plan of making a new flange out of aluminium, welding that to the top of the manifold. Drill a new hole through it then use one of my 90 degree stainless bends with 2 flanges cut from stainless and attach the whole thing together. Oh, and a blanking plate for the old hole.
First up was to remove the manifold from the engine, easy enough job to do.
Then I needed a piece of aluminium. I was about to go to a few local fabricators and scrounge a piece when I remembered that my garage used to be a fabricators shop years ago and I was sure I saw some plate in the attic. Luckily I found it again and cut a piece out of 10mm thick aluminium, lucky or what eh!.
I may get heckled at this point for my lack of real engineering style but I don't have access to a milling machine and I don't want to pay some one else to do this process so I improvised. I needed to smooth down the groves in the manifold so I get a better seat of the plate. I scribed the edges then used a flap disc to remove the most of the material and then a file to get it flatter. Turned out not too bad, wasnted perfectly flat but it allowed a closer contact for the welding.
I then neatend up the plate I was using and cut it to suit. I drilled 4 small holes that I would use to clamp it down whilst welding. I drilled 4 holes in the manifold then tapped them to bolt it on.
Right, bit of a lecture coming up now. I checked out a few books and websites about Mig welding aluminium and I found it quite tricky to set up so I will share my findings here. I was told id need Aluminium welding wire, which I got from machine mart (0.8mm) . As the wire expands much more than steel wire I would need a tip the next size up (1mm) so I got some of those. I was also told id NEED a Teflon liner, which I made me think "psssh, nah I don't need that". Also, you need pure argon or an argon/helium mix, as I use a Tig aswell I already had some pureshield Argon. The length of the liner can also play an important part of the process. As aluminium is much softer it tends to snag on tight bends so you want it to be as short and as straight as possible. I didn't want to shorten my lead for a small job so I got a piece of 25mm Angle and cable tied it to the torch and lead, like so:
Then I made my first attempt at it on a scrap piece of aluminium. First go it melted the tip straight away. Next go it done the same, its so different from welding steel. I swear I went through atleast 15 tips trying a whole range of amps, wire speed combos. I just could nto get it right and ofcourse everytime it jammed it would "bird-nest" the wire and id have to pull it all through again. I was getting so frustrated with it. Then I thought, "maybe a Teflon liner would help out" so I went back along to machine mart, got a liner and some more tips. I put the new liner in and wow, what a fool I felt. It made all the difference and I could now get a proper weld going. So, after messing about again with amp and wire speed I felt comfortable enough to make a go of the manifold.
I followed another bit of advice of pre-heating the manifold to help the welding process.
If I could give some basic advice with the welding I would say to definitely get a Teflon liner, try to keep the cable as straight as possible and I found myself welding with the torch much further away from the weld than normal and moving it a lot faster. I was lucky that what I was welding was reasonably thick so I never got any blow-through but I think it would be very easy to do with thinner metal.
I was so engrossed with the welding I never took any photos of the process, but here it is after I tidied it up a little.
The manifold attaches to 4, dual port flanges with 3 bolts on each flange. I knew the manifold would distort slightly with that much heat going through it. The reason for the paper being in there was I wanted to bolt the manifold on with 4 bolts tight down and I thought if it traps the paper tight enough then it should seal back up nicely when I come to re-attach it. The pieces of paper wouldn't budge so that was good.
I had to drill a 3 inch hole in the top of the new flange so I went and bought a 76mm hole saw from tool-station and done that, to help take a bit of stress off the hole saw I also drilled small holes around. Then I drilled out the 4 holes and threaded them out to M8. That way not only is the weld holding the flange on but so will the bolts. When cutting through I noticed I but out a section of a piece of pipe that im assuming has something to do with the EGR system so I put another little blob of weld back on to seal it.
Using some 6mm stainless sheet I cut out 3 flanges, one for the new hole I just added on top, one to attach the throttle body and one to act as a blanking plate. I put the bend in the hole which recesses down about 10 mm, should give a better seal . Here is the blanking plate I cut out.
Then I tacked on the 2 other flanges.
I haven't Tig'd stainless in a very long time but I was getting the hang of it again. Once finished welding I put it in place to see how it looked.
Not the neatest welding but I can live with it,
That's pretty much it for now. It still needs a little tidying up but its a big thing done. Im hoping I can get away with out having to get anything milled down. What I shall be doing is making up some crappy blanking plates for the whole manifold to seal everything I have done so far then fit a valve and do a pressure test to make sure none of my welds are leaking or that there is any distortion that will effect things later. If there is then I will need to take it somewhere to mill the faces, fingers crossed.
The garage is turning into a bit of a pig-sty so I am doing my early spring clean. I spent today pretty much making a floor in the attic where I can hide some my******and clear some space. Next month, mmmhmm, not sure what to start on next. I think I will attempt the seating area, get that back in , I think I need to raise it a couple o f inches and make a new frame to support it all.
Oh, almost forgot, i did have a little fun project to do. My desk chair at home was looking abit tatty and i was going to buy a new one when i thought i could maek an evern better and comfier one than store bought.
I got an old desk chair and removed the seat which left me with the base.
Then i got my passanger seat from the old lexus.
Made a qucik little frame to go underneath it and join them both together.
And voila, a new xomputer desk chair. First thing my darling wife said "it doesnt match anything else in the house...." Ohwell, i think it looks good so its staying.