VO wrote:

Paul,

The drawing looks good so far. Do you want to add the dimensions
or will you make a 1/8 inch thick Lexan template and send it to me?

I did in DXF compatible software and probably DXF file will be
suitable. What kind of process are you using? CNC? or Laser?
What associate cost could be? Should I find local shop, any
hints on that in NC, RTP area?

I am not sure about that yet. A DXF would be fine but keep it simple.
No layers. If I cannot load it into ACAD 11 you can send it as a gif or
in the worst case a bmp and I can convert that to a gif. PL

You will not need the holes where I have marked them with red X's.

Bottom holes for water returns, heating of intake, prevent icing in
high altitude. Are you sure it is extra which I do not need?
Additional plumbing?

If you are using fuel injection icing will not be a problem. PL

Top ones it is additional air jet stream for spreading fuel from injector.
It helps for cooling bottom of injector and improve spreading fuel,
make even fuel distribution over volume. In theory of internal
combustion a lot of undiscovered spots. But definitely was
proven as much as possible even fuel and air mixture distribution
will help for pressure distribution, economy, prevent early wearing
of piston/rotor seals, etc. You have expertise. Do you think
this part could be simplify? Perhaps it good idea drill small
holes in top of intake holes to make some air stream to the
injectors chambers? Suggestions?

Well if you don't mind the extra complexity it is worth a try to improve
the fuel burn. Is it high pressure air that is injected? If so where does
that come from? If a pump is used the pump will absorb HP of course.

Jon, got any idea what Mazda is doing with those small holes
over the intake ports on this engine. Some sort of smog function perhaps? PL

It would be a good idea to bolt the Lexan template on Rob's engine
to make sure it will fit his as well.

I will express this suggestion to him, and send copy to him
for practical measurement.

By observing photo of my engine, could you tell me
(or guess) which model of 20B it is? In correspondence
with your subscribers, you and others using some time
specific determinations, such as 89, Cosmo, etc.
Please explain. Thanks.

You got me there Vlad. From the size of the ports I would guess it is 
a late model. Jon, got any idea what Mazda is doing with those small holes
over the intake ports on this engine. Some sort of smog perhaps? PL

Thank you for suggestions and help!

Sincerely,
Vlad
N1UT

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