Mazdatrix dyno is still down but here is a picture
of the dual 2 inch runner injector holders and
fuel rail. Fuel rail is easy to make even on a drill press
if you can buy some 3/4 by one inch aluminum bar stock.
Uses off the shelf MSD 50 pound per hour injectors.
Ford and Mazda injectors shown for comparison.
Any day now we will be testing the engine.
Paul Lamar
Cutting these injector holders are a pain in the butt.
All MSD injector dimensions appear to be metric.
One of the major problems is you need a 20 degree taper
so you can insert the O-rings in the bore. MSD has a cutting tool
for sale but it is $200 and it does not fit the #50 pound
injectors. I could put out a couple of hundred dollars
and have a custom cutting tool made.
I think I finally found an easier and cheaper way to do it.
Here is an off the shelf tapered mill from AirGas
with a 20 degree angle each side that will work.
The crooked line in the 2D sketch is the out line of the injector
body. The bore in question is about 13 MM but a 33/64 (.516)
drill will work. I then plan to ream it with a hand 17/32
reamer. The same drills, mill and reamers will work on the
fuel rail.
This can now be done on a drill press if you have the right
drills. The .975 injector body hole could be done with a 31/64th
drill instead of 12 mm drill.
The aluminum blocks them selves can be cut lickity split from
Industrial Metal Supply in San Fernando CA mail order.
Saves a lot of milling and their high speed saws
can do this in no time. Helps if you order ten or
more at a time. You send them the dimensions and they cut
them to exact size. No milling machine or milling required.
Great surface finish as well.
The position of the O-rings are also shown on the 2D sketch.
I am leaning towards bonding these things on to the two inch
tube with epoxy. Perhaps one small tack weld on each side
after bonding for insurance.
Paul Lamar
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