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Message
From the discussion so
far, it sounds like I need some more continuous flow through the vent system so
I have attached a drawing of my proposed changes, submitted for your
[dis]approval.
Hi Dave. The proposed
scheme is much better. In fact, it's EXACTLY what I had in rev-1
(big low mounted rad, same vent port, etc), and also the way
it's done in a 3rd gen car. Mazda refers to
the pressurized can as an AST (air separator tank). Mine flowed
just dandy with and without a thermostat. The only problem was that it was
a pain to fill, since my pressure cap wasn't the high
point.
During my rev-2 upgrade, I
simplified the system further, and got rid of the AST. I was able to mount
a pressurized cap at the high point where the water outlet is, and
only have a plastic jug for overflow now. So far, this is working even better.
Lastly, I
want to take a poll. I know there is no right answer so I am looking for
everybody’s opinion. While I have the engine apart I am considering
replacing the 9.0:1 turbo rotors with the higher compression 9.7:1 n.a. rotors,
even thought I still plan to run the turbo.
I ran as much as 10 psi on
mine, with 9.7 rotors, but I was using 100LL fuel, and had the timing retarded a
bit. From everything I've heard, you won't really be able to tell the diff
between 9.0, and 9.7. That being said, when I upgraded my 8.5 rotors, I
insisted on 9.7, rather than the 9.4 rotors. The 8.5's are still in the
attic. They only have Mazda's test run time on them. I'll make you a
good deal :-)
Cheers,
Rusty (off to test a pitch
setting that's probably too low)
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