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I've had a look at the Turbo exhaust on the 13B and the overlap is quite a
bit more, as the extra area is in hight, compared to that of the NA
housing.
The Turbo actually opens at the same time as the NA housing but closes
later, as you alluded to.
So the Turbo housing is 'OUT' for the single
PP.
( Hope your taking notes here Rusty).
Interesting
observation, but are you sure your turbo housing hasn't been ported? I
just set an 87-88 6-port housing on top of an REW housing, and the exhaust ports
are identical in side, shape, and location. The only difference
is the 6-port has the splitter. Take a look at Paul Yaw's article on
port timing basics- http://www.yawpower.com/techindx.html
He gives the timing for intake and exhaust on lots of different housings,
and he shows the timing to be the same also.
For fun, check
out the Picture Gallery. Start at picture number 25, and you'll see his PP
modification.
If those reading this are confused or not considering PP take no
notice - this is mainly for Rusty's information for when he converts
to PP.
I still want to
do a test one day, with junk housings, but I've got a lot better things to
do with my time at the moment. I did spend a whole morning reading PP
posts on the RX-7 Club list the other day, and it just reinforced what I've been
told about this being a bad idea. There were some nice pics of people
boring their own ports though.
Cheers,
Rusty (thumbing
my nose at the "experts" with my NPG-R coolant)
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