custom exhaust sleeves explained
Senior Member
Joined: Apr 2007
Posts: 308
Likes: 4
From: WA state
Its too bad the pics are gone...
RG: It seems u were right on the money, the 1980 "Mazda Rx-7 Competition Prep and Service Manual"
(p.51) shows that they recommended exhaust headers as follows: SS304, 42mm dia (1.65") x 1.5mm wall (.059"), I can't imagine they'd use exhaust ports w/larger openings than the headers!
This is on a NA PP 12A, w/270 ps @ 9k rpm...48mm DDW..(Weber IDA)!!
RG: It seems u were right on the money, the 1980 "Mazda Rx-7 Competition Prep and Service Manual"
(p.51) shows that they recommended exhaust headers as follows: SS304, 42mm dia (1.65") x 1.5mm wall (.059"), I can't imagine they'd use exhaust ports w/larger openings than the headers!
This is on a NA PP 12A, w/270 ps @ 9k rpm...48mm DDW..(Weber IDA)!!
Joined: Mar 2001
Posts: 31,833
Likes: 3,232
From: https://www2.mazda.com/en/100th/
yeah the theory is sound, there is a paper from 1990 about the P port design and they only spec 43mm headers. a stock FC block exhaust exit is 48mm.
actually as an aside i looked under the factory GTU SA, and 42mm looks TEENY, it looks like its using a pair of drinking straws.
actually as an aside i looked under the factory GTU SA, and 42mm looks TEENY, it looks like its using a pair of drinking straws.
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