Tom Kendall wrote:

<Snip>

Looks good Perry.

Tom Kendall should have some intake manifold castings anyday now.

Tom Kendall replied:

Good guess Paul!  Got a call from the foundry today (Thursday).  The

trial

casting is poured, "looks good", and I'll pick it up tomorrow morning.

I'll

take it over to the machine shop and get it all cleaned up for photos &
dimensional checks.  Should have something posted within the week.

Don't know if I mentioned it before, but the guys at the foundry are

kind of

interested in this project.  Seems the Pattern Shop foreman owns an

RX-7.

Has he seen your three rotor yet?

Paul Lamar

Tom Kendall responded:

I'm lugging the stock 3 rotor manifold with me to the foundry for them to
eye-ball.  I don't think they (or 99.9999% of anybody in this country) knows
3 rotor engines exist.

I was looking it (the 20B manifold) over tonight, and noticed that although
the ports on the block are different sizes (the same as the various 13B
ports), the runners all transition to identically sized diameters.  Is this
the case with the 13B stock manifold?  On our version, the smaller ports
will have proportionally smaller runners.  This should keep intake
velocities uniform throughout the runner length.  Just a curious deviation.
I doubt it will make any difference whatsoever.

Due to the nature of the three rotor it is not possible to do a dynamic
chamber manifold so a simple tuned manifold was used. Same goes for the
new RX8.

Paul Lamar
 
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