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Bill,
Your right as usual, the proof is in the pudding. I understand what your
saying about tube length and pumping losses. One of the needs of the smaller dia
runner is the higher inlet velocity to give best VE. I believe Lynn suggested as
much, but what is best for our needs is still guesstimating IMHO, however I take
on board your suggestion of 1.75" - yes! wouldn't it be great to make more power
than one expected.
I for one appreciate your efforts to contact Larry!
If someone was willing to manufacture the suggested PP, would you help with
a drawing that shows what we had discussed?
George ( down under)
George and
Jerry,
I believe that a properly contoured 1-3/4" port will work fine, but
I believe that the tube length is far more important. My logic is that
smaller ports do incur more pumping losses. Another thing to remember is that
if your engine makes more power than you expect at a predetermined RPM that is
OK too. I completely understand why you want to go with 1-3/4" (44.5 mm
George) to keep the gas flow speeds up. The thing to remember is a badly
contoured or poorly timed small port will insure nither power or tractability.
What really needs to happen is we need to build some of these things and test
them.
George,
I have e-mailed Larry through the other list. I can't help him
unless he contacts me. So far no joy. I have some ideas for products which I
would contribute just for the parts if he is willing to cooperate I'm
in.
Bill Jepson
Jerry,
I am totally in agreement with your on this subject Jerry and
I would dearly
love to get Larry (on the other list) who is an engineer
with his own CNC
engineering business, on this list as well. Now
Larry gave a really good
evaluation/assessment on the port sizing which
was in line with all that I'd
see before and he concluded a smaller
Diameter PP which someone didn't agree
with - Jerry and I have both asked
for his e-mail address and it never found
the group ( funny
that).
I was hoping Bill J. would be able to arrange this ( hint,
hint).
BTW Larry is intending to manufacture Mazda components, to
service the
Aviation Industry. Just reading his suggestions, convinces me
he knows what
he's about in relation to the rotary and is in a position to
be a great
contributor. However I did suggest he make single cranks but I
got no
response from that one.
Now the suggestion of welding a SS
tube to the steel liner ( on the inside)
and my suggestion to Bill J. of
an O ring on the outside, would seem to me
to be the ideal PP
configuration, now the only other thing to decide is the
Diameter. I
believe 1.5" ( 38mm) is adequate, but with any restriction
maybe 1.6 ( 40
to 41mm) to 1.7 ( 43mm) would be necessary. I think the
suggested Al 2" (
51mm) has an ID of 1.8 ( 45-46mm) - we really are
splitting hairs at this
stage.
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