I decided after my adapter broke, I might as well just build a manifold. So I started thinking about a design. I'm studying engineering but a degree wont just build a good manifold. Its more experience and lots of testing that will get a good manifold. So I started looking at F1 manifolds and other race cars to see what they do. I think BMW has it figured out on this engine
Its a 1.5liter that can make 1300hp. I noticed most manifolds have cylinders that are 180 degrees apart in firing order equal length, they're staright as possible and have a short collector. One thing I did learn from school though is that you want to have the largest temperature difference as possible across the turbine (change in enthalpy) so shorter is better in terms of spool up but once its spooled and there is energy beeing bypassed the heat issue is much less important. I know there is so much more that goes into manifold design but since this is the first one I'm building, I'm just going to build it. From planning it out, its going to be equal length in 1+4 and 2+3, short as possible and probably a top mount flange. I'll be posting some pictures of the progress.
sweet, exited to see some results jon! oh and since you are so worried about spool you should focus on short runners to take advantage of the enthalpy change. we know it will keep spooling up top.
but really i would just try to make it as reliable as possible as my #1.
got most of it done today. 3 runners and the collector. The collector was definately the hardest part. A bandsaw would have been reallly nice. I spent lots of time grinding but it came out decent. The runners werent too hard. It took alot of testing and breaking it apart to get it right. And I only welded the flange upside down one time. Pictures.
started with this
ended up with this
collector: slightly off
And it came out to be exactly enough pipe and bends. I took my last piece of pipe, cut it in half and it fit perfect (kinda)
EMO4life
. Pictures.
