Mopar M1 Manifold Injector Bosses, Not Drilled Out
Re: the bungs, the hard part is done. I have only just recently picked up where i left off.
The injector bungs in the magnum manifold have an opening of 11mm, that is the hole which the injector actually squirts through. An 11mm transfer punch is a firm fit in this hole with no slop at all so can be used as the basis for alignment of the jig during fabrication.
The entire jig bolts onto the face of the manifold where it bolts to the cylinder head.
The 6mm thick top plate with the tubes will be able to be removed/replaced while the manifold is setup on the drillpress. I currently still have it tack welded together since that is the best way to make sure nothing moves while drilling the bolt holes, the bolts will have a countersink to ensure correct alignment upon reassembly.
Using this design I can use the same 11mm transfer punch in the drillpress chuck to align the drillpress with the tubes in the plate and then when everything is aligned I simply remove the top plate and replace the 11mm transfer punch with the "injector bung drill" which I bought from Ross machine racing.
This is the jig as it sits now, it doesn't have to be pretty it just has to work.
The rough looking tabs at the ends are just tacked there for stability, they will be removed.
Unfortunately, there were some setbacks and it's not completed yet. There was a fire in the workshop and it's been under construction for about 12 months.
Re: the bungs, the hard part is done. I have only just recently picked up where i left off.
The injector bungs in the magnum manifold have an opening of 11mm, that is the hole which the injector actually squirts through. An 11mm transfer punch is a firm fit in this hole with no slop at all so can be used as the basis for alignment of the jig during fabrication.
The entire jig bolts onto the face of the manifold where it bolts to the cylinder head.
The 6mm thick top plate with the tubes will be able to be removed/replaced while the manifold is setup on the drillpress. I currently still have it tack welded together since that is the best way to make sure nothing moves while drilling the bolt holes, the bolts will have a countersink to ensure correct alignment upon reassembly.
Using this design I can use the same 11mm transfer punch in the drillpress chuck to align the drillpress with the tubes in the plate and then when everything is aligned I simply remove the top plate and replace the 11mm transfer punch with the "injector bung drill" which I bought from Ross machine racing.
This is the jig as it sits now, it doesn't have to be pretty it just has to work.
The rough looking tabs at the ends are just tacked there for stability, they will be removed.