Paul,

I measured the 2-pack injectors on the primary fuel rail when I got home
tonight, Best I can tell, it is 1.0" center to center.

Mark S.


Well I guess it is a die cast housing which might be needed
to feed the injectors. That makes it hard to make one with
an ordinary mill. Here are some old dwgs and pictures of the
fat injector holder. I made this one (one inch center to center)
on my my cheap Chinese mill. Took lots of time.

Paul Lamar


Paul,

Attached is a pic of the part of the fuel rail that I would like to cut
off
and use.  That may turn out to be a non-option, depending on whether or
not
I can find a spare fuel rail.

If push comes to shove, I can always buy some Siemens injectors and use
your
injector blocks.  Or, go with some of the sdsefi.com injector holders and
use my old injectors.

Mark


Those $40 sdsefi injector holders are pretty nice. Looks like you plumb
each one separately. Will the fat one fit your injectors? It looks
like a top feed. Any idea what the Kinsler injector holders cost?

Do you have access to a mill? I have an idea that might work for you.

--------------------------------------------------------

The low cost trick is to buy 3 by 1 and 1/2 inch bar stock from
McMaster so you don't have to do any milling on the outside.
Have them cut it to about 4 inche long blocks.
The hard part is setting it up in the mill at 30 degrees
and using a fly cutter to cut the radius for the 2 inch tube.
Everything else is straight forward drilling.

The three blocks can be welded together with 1/2 inch OD
3/8 ID aluminum tubing to form the fuel rail.  You may have
to drill 1/2 inch rod unless you can find tubing that size.
You could also bond it together with JB Weld like Tracy does :)

Measure that injector for me and I will put some dimensions
on the hole positions.


Paul Lamar

Paul,

Yes, the sdsefi holdders are nice.  They don't appear to work with the
 side
feed injectors, but I also have 6 of the normal 13b/20b 550cc injectors
that
I could use.

Let me run this by my machinist and I'll get back with you.

Mark

BTw Mark if you use those side feed injectors and go to all the
trouble to making a custom holder and fuel rail you could pay
the piper down the road if one fails. I would not be a bit surprised
if Mazda charged well over $100 while just about any other
injector can be had for $50.

Paul Lamar




 Good point... But I'm already running 3 of them in my current engine.
 Besides, Bob Mears gives great discounts.  ;-)

 Mark

 Your up early and I am up late :)

 Only three? They must be throttle body injectors. That means
 they are used in something else.

 Paul Lamar

Paul,
The 20b uses 3 side feed and three regular thru-feed injectors.  These are
the same injectors that I'm running in my Lancair.

With that said, I think I've decided to go ahead and order a set of the
Siemen's injectors so I can use your injector blocks.  Going by ebay prices,
it would run $300 for the injecots, plus your injector blocks.  All in all,
that's a pretty straight forward approach.

Mark S.
Austin

Too bad I just found a couple of those side feed injectors
up at the hangar :)

The injector blocks will be done this coming week Allah willing :)