Originally Posted by
Niels Abildgaard
Is it really important that header pipe is cirkular?
Exhaust leaving cylinder during blow down time is very rectangular.
Pressure in exhaust systems does not exeed 2 bar absolute.
To my eyes it can be made of four very funny shaped pieces of steel edge welded together and then blown with water.
Well history tells us flat sided two stroke exhausts do not handle the pressures present in a two stroke exhaust very well at all. The first TZ750s with all four pipes under the bike had flat sides so they would all fit, in the first Daytona 200 they raced in almost all of them cracked before the end of the race.
Compare Pornography now to 50 years ago.
Then extrapolate 50 years into the future.
. . . That shit's Nasty.
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