09-11-2020, 08:42 PM
Being concerned about the extra pressure of the blower, I opted to make the central pair of pipes separate with just enough space down the middle to get an Allen head bolt / Cap screw which has been machined down on the sides. In addition I heated up #2&3 exhaust pipes and gently pressed a shallow dent in each one so that my very skinny Allen head bolt will just fit between them. I have a long Allen key with a ball end to tighten it up. All the bolts are dipped in Stag steam pipe jointing compound which has proved to be rather effective at sealing the threads and stopping things falling off.
Yes I know I should have made 1-4 & 2-3, but I didn't and the bonnet has been cut and there's no going back.... it's force fed, so hopefully I'm not loosing too many Shetland ponies.
This picture shows the offset motor as well as the blower drive, a Yamaha 650cc shaft drive which my incredibly talented Engineering friend Steven made. The coupling at the blower end is flanged & bolted together with 4 shoulder bolts with a 1mm tolerance taken up by small O rings so in theory I have a 1mm expansion allowance on the blower drive.
I made up a blunt square with a tapered end out of scrap steel which I hammered into the red hot ends of the mandrel bends to make them the same shape as the holes in the manifold plate - you can see the ends have a square just where they are tack welded to the flange. I did the same with the intake feed pipes from the blower, but made those rectangular to match the plate. Having square sides helps with clearance for the Allen head manifold bolts. The pipes required careful trimming to get the angle of the bends to suit the tapered location of the offset motor, in the block Jig picture you can see the line of the 'body' on the steel plate below the block as well as a cardboard template next to it. Dad had a few manifold flanges lazer cut from a gasket in case I made a hash of something, but in the end, I only used the one.
It was a fun project and very rewarding to build & drive
Aye
Greig
Yes I know I should have made 1-4 & 2-3, but I didn't and the bonnet has been cut and there's no going back.... it's force fed, so hopefully I'm not loosing too many Shetland ponies.
This picture shows the offset motor as well as the blower drive, a Yamaha 650cc shaft drive which my incredibly talented Engineering friend Steven made. The coupling at the blower end is flanged & bolted together with 4 shoulder bolts with a 1mm tolerance taken up by small O rings so in theory I have a 1mm expansion allowance on the blower drive.
I made up a blunt square with a tapered end out of scrap steel which I hammered into the red hot ends of the mandrel bends to make them the same shape as the holes in the manifold plate - you can see the ends have a square just where they are tack welded to the flange. I did the same with the intake feed pipes from the blower, but made those rectangular to match the plate. Having square sides helps with clearance for the Allen head manifold bolts. The pipes required careful trimming to get the angle of the bends to suit the tapered location of the offset motor, in the block Jig picture you can see the line of the 'body' on the steel plate below the block as well as a cardboard template next to it. Dad had a few manifold flanges lazer cut from a gasket in case I made a hash of something, but in the end, I only used the one.
It was a fun project and very rewarding to build & drive
Aye
Greig