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Ken,
It has already been done. The local Rotary
specialist has suggested a slight skim off the rotor sides otherwise
they bind-up with High RPM (over what we are seeing), but I will get mine done
anyway.
The biggest problem I see is that the side
compression seals are a little short compared to the RX8 - however I'm yet to
see it physically. It may be that the racing crowd want a really tight
compression seal - the normal side seals aren't that close.
There is an extra inside compression ( metal) seal
and the specialist felt that this was to minimize and blow-by of the gappy
side seals - that will do me.
There are 3 sizes of side seals to choose from, but
you can't use Rx7 seals - so I believe. Some have overcome this by using
oversized apex corner seals.
Your suggestion on apex seals is in line with the
local specialist.
I will check those measurement for you, but I would
suggest that these chaps racing have 'been there and done that' and are using
them, so they do 'fit the hole'!
George (down under)
Hi George,
I don't think we need to worry about apex seals in a non-turbo
motor. Tracy's or Hurley's 2mm seals will never break in a NA motor
since there is no problem with detonation. I just took some measurements
of a '88 13b rotor: width measurements around the outside of the rotor
showed 3.136 - 3.139 inches. Inside measurements from the gear face to
the opposite side of the rotor (measured inside the bearing shell) was 3.144
to 3.145 inches. I do not have micrometers large enough to measure from
an apex seal groove to the opposite curved face of the rotor. I don't
have CAD capability so I can't send a drawing; can someone draw this up for
us??? We need to compare these measurements to a RX8 rotor to see if the
RX8 rotor will fit in the 'hole' of the earlier 13b's.
Ken Powell
Bryant, Arkansas
501-847-4721
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Original message --------------
Ken,
That's very true, and what I plan on doing for
the single, do you think it's worth going to 3mm for a non - turbo single
rotor?
The RX8 rotors are dirt cheap ( compared to new
RX8 rotors) What dimensions do you want measured - I will do it for
you!
George ( down under)
I don't see the need for a 'bridged' intake port on the RX8
engine. The RX8 also uses a 2mm apex seal; I think we can grind the
RX8 rotor apex seal groove to the same depth as the older rotors then use
Tracy's or Hurley's 2mm spex seals in a peripheral ported Renesis.
You should be also be able to use the lighter 8.7 lb RX8 rotors in
the older engines if you get the rotating assembly balanced.
Wish I had a RX8 rotor so I could measure the critical dimensions (but not
bad enough to buy one!(grin)).
Ken Powell
Bryant, Arkansas
501-847-4721
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