Post pics of what your exhaust ports look like
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Rotary Freak
Joined: Feb 2001
Posts: 2,524
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From: MN
Post pics of what your exhaust ports look like
I just got my cosmo engine and took the turbo assy off to see some strange looking ports. They look like a "D" ( damn it I wish I has my dig camera
) and have edges in them. They don't look smooth like the exh ports I've seen or like this 
Do the FD ports look like a "D"?
) and have edges in them. They don't look smooth like the exh ports I've seen or like this Do the FD ports look like a "D"?
Weird Cat Man
Joined: Aug 2001
Posts: 2,868
Likes: 3
From: A pale blue dot
Here are some pics.
The shiny housing is a new 1993 housing that I street ported
The middle housing is a used 1993 housing that is stock
The other end housing is a 1987 turbo housing that is stock
Enjoy.
Brian
The shiny housing is a new 1993 housing that I street ported
The middle housing is a used 1993 housing that is stock
The other end housing is a 1987 turbo housing that is stock
Enjoy.
Brian
The reason behind the D shape was to aid in efficiency with the turbos.
The ports should also look like they flow towards the rear and are not straight in and out. I dunno how the flow really is but supposedly it aids in spooling the stock twins.
I used to work at a rotary shop and have seen some really odd looking port sizes on the Jap stuff from 10A's to 20B's.
If you have that RE intake manifold I'd use it as well. It's like a ported
stock manifold plus there isn't any emmission BS on it.
The ports should also look like they flow towards the rear and are not straight in and out. I dunno how the flow really is but supposedly it aids in spooling the stock twins.
I used to work at a rotary shop and have seen some really odd looking port sizes on the Jap stuff from 10A's to 20B's.
If you have that RE intake manifold I'd use it as well. It's like a ported
stock manifold plus there isn't any emmission BS on it.
Eats, Sleeps, Dreams Rotary
iTrader: (1)
Joined: Jul 2001
Posts: 3,383
Likes: 3
From: Stinson Beach, Ca
Maybe we could start a collection of pictures and diagrams and measurements for best levels of street ports, bridge ports, peripheral ports, exhaust ports and combinations of the kinds.
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Eats, Sleeps, Dreams Rotary
iTrader: (1)
Joined: Jul 2001
Posts: 3,383
Likes: 3
From: Stinson Beach, Ca
we have any cad men?
get some graphs and scale drawings and whatnot.
hmmm, hopefully we can work out a way and find people willing to donate
copyright em for RX-7 Forum or make em free to use privately but not to mass produce.
Kinda like the Linux of porting ;-)
get some graphs and scale drawings and whatnot.
hmmm, hopefully we can work out a way and find people willing to donate
copyright em for RX-7 Forum or make em free to use privately but not to mass produce.
Kinda like the Linux of porting ;-)
Thread Starter
Rotary Freak
Joined: Feb 2001
Posts: 2,524
Likes: 0
From: MN
Originally posted by Otay
The reason behind the D shape was to aid in efficiency with the turbos.
The ports should also look like they flow towards the rear and are not straight in and out. I dunno how the flow really is but supposedly it aids in spooling the stock twins.
I used to work at a rotary shop and have seen some really odd looking port sizes on the Jap stuff from 10A's to 20B's.
If you have that RE intake manifold I'd use it as well. It's like a ported
stock manifold plus there isn't any emmission BS on it.
The reason behind the D shape was to aid in efficiency with the turbos.
The ports should also look like they flow towards the rear and are not straight in and out. I dunno how the flow really is but supposedly it aids in spooling the stock twins.
I used to work at a rotary shop and have seen some really odd looking port sizes on the Jap stuff from 10A's to 20B's.
If you have that RE intake manifold I'd use it as well. It's like a ported
stock manifold plus there isn't any emmission BS on it.
thanks for the pic's wargasm!
now lets see some more!
)
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