Mythbuster: continuing project thread of my 1303 '75

[70Turbobug]

NOooo, with an additional collector before the turbo, I would totally KILL the twin-scroll principle/advantage/idea!!
So, the pipes will remain seperate. I just have to hammer them both into a rectangle at the end

Not necessarily..depends on the collector size and length.If you don´t use a common collector,then the 2-1 collectors should be the appropriate size,to minimize pulses and backpressure.I´m not saying that is the case with your system,just speaking out generally.I´can´t remember where,but I saw a collector that someone made from a Burns collector,it was a 4-1 system with a 4-1 collector that then divided into 2 rectangular pipes to the twin scroll flange.As far as heat retention and minimizing back pressure,I think that would be pretty effective.

[Wally]

Originally Posted by 70Turbobug

...,it was a 4-1 system with a 4-1 collector that then divided into 2 rectangular pipes to the twin scroll flange. ...

Ah, yes, that would work too, but it does mean you are keeping all 4 primaries seperate untill at the divided turbine flange and only then merge 2 into 1, twice. Its still a twin scroll header then, only you keep 4 primaries all the way untill the turbine, resulting in much longer primary lengths, thus reducing spool time imo.
My turbo location is already rather far away, so I will do anything fysically possible to keep pipe lengths to a minimum, hence this construction/lay-out