Mythbuster: continuing project thread of my 1303 '75

[Wally]

Originally Posted by paul_f

I'd like to cut and move slightly backwards the pipe that runs near the pulley as it is very close, but I think it will be quite difficult to do nicely without remaking that section.

Problem with that part is that it is the 180 degree section that curves right behind the rear apron. If you move it further away from the pulley, it gets close to the apron... You may get away with that, but I have less room as you know

Thanks for the measurement, though I wanted the one at the other end of the collector. I think it is 54mm OD but I am not certain.

Cheers
Paul

Sorry...but you're correct. That part is OD 54mm.

[Wally]

Made some nice progress this weekend:



Trial fitting the too big of a turbo.
Looks like it might even sort-of fit Be aware that I have a bit more room there as my engine is moved a few cm further backards.
The 4" (!..) air inlet will however collide with the Cup strebe so will need to make s/th for that, for which I already have an idea

[70Turbobug]

Looks good Wally! I see space is now even more limited...
If you don´t need your BAS header,I´ll buy it from you Or did you cut it up to make this one?

[Wally]

Originally Posted by 70Turbobug

Or did you cut it up to make this one?

Yes, I hoped the pictured showed that..

[Xellex]

you will be punished by the aircooled gods for cutting up a BAS header like that! I hate you just a little right now :P

[70Turbobug]

Don´t worry,Wally knows what he´s doing...I think... Wally, are you going to have a collector before the turbo or will the pipes remain seperate up to the flange?

[Wally]

Originally Posted by 70Turbobug

Don´t worry,Wally knows what he´s doing...I think...

I dunno, but surely hope so

Wally, are you going to have a collector before the turbo or will the pipes remain seperate up to the flange?

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

[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

[70Turbobug]

Yeah,I hear ya Wally - space is a big problem.I´m hoping my GT3071R will fit in your old location.I won´t find out until I have the engine in the car.Hopefully my case will finally be back on friday so I can put it together.I will be putting the car together this winter -finally.

[TSAF]

Winter time is the best for car projects!

[70Turbobug]

Yeah,finding time and motivation can be tough.Thanks to threads like this it keeps the fire going.So if my car never gets finished it´s Wally´s fault for not posting enough videos and pics

[TSAF]

Wally we need more videos, pictures, everything you have to keep us going!!!!!!!!!!!

[Wally]

Haha! well, not spectaculair news, but some small steps are sometimes needed as well to complete a job.
So, I now finally have the oil feed for the Borg turbo complete
This was quite a hassle. Why? see for yourself:





Left to right: 1/4" NPT is the thread size into the turbo, so I needed a 1/4" NPT to 1/8"NPT adapter, 1/8"NPT male to 1/8"NPT with 0.165" restrictor (1.5mm), 1/8"NPT to inverted flare female connection and M10x1.0 inner thread, M10x1.0 male and inverted flare 'copper' 5mm (~3/16") brake line.
This connects then to a goodyear braided oil line (with M10x1.0 ends) that feeds of the oil pressure connection on the engine case (with a 'T' for a oil pressure sensor)

Next job will be the oil drainage adapter, which will have to be made from scratch (from hi-grade alu) for my -12 line... (all adapters for sale are -10...)

[70Turbobug]

Why the 1.5mm restrictor?