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handmade v12 exhaust manifold

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AdrianBurton:
I will get it out tomorrow

aeauto:
 Adrian,  The adapters are almost done, just need to cut the notches for the speedometer pickup.  I will be doing some exhaust flanges for an Audi engine soon so could have yours cut at the same time.  If you can send me a gasket that I could make a CAD drawing from that would work.

AdrianBurton:
Eric,

I can do that, I can make and sent you dawings and or files, what kind do you need?

I do still need to get those axle adapters from you

aeauto:
Adrian,  If you can find someone who has a CNC plasma or a water jet they should be able to cut your flanges.  I have found that water jet is rather expensive but was surprised how cheap laser was on some 1/4 inch thick plate parts I had cut.  Plasma is probably the cheapest if you can supply them a CAD drawing.  I can do the drawing if I had an exhaust manifold or head to measure.  A gasket might do too.

AdrianBurton:

--- Quote from: RT on February 09, 2014, 10:49:16 PM ---Jets303…
Very nice!
I noticed the 12 cyl. exhaust manifolds join three-into-one and join the other three-into-one at a two-into-one collector.  Is there a reason for this?
Again, nice work.

RT

--- End quote ---

RT

This is from Burns Stainless:
"It should be noted that six-cylinder and 12-cylinder engines are inherently balanced and even firing.  That is, for an inline-six (I-6) cylinder engine, the firing order is such that cylinders fire alternating between the front 3 and rear three cylinders with a separation of 120 degrees (720/6).  The cylinders of a V-6, engine, typically arranged in a 60 degree “V”, fire in an alternating fashion between banks also with 120 degree separation.  A V-12 is essentially two I-6s (or two V-6s) joined together at the hip, with cylinders firing in an alternating fashion from bank-to-bank separated by 60 crank degrees (720/12).  The melodical sound of a Ferrari V-12 is testimony to the even firing nature of these engines.  Typically, I-6 exhausts are setup as two 3-1 headers.  The front 3 cylinders are combined into one collector and the rear 3 into another.  A V-6 engine normally has a 3-1 collected system on each bank.  A V-12 typically has two such setups (4 x 3-1 headers).  In many cases, the 3-1’s are combined into a final 2-1 resulting in a single exhaust pipe from each bank of 6 cylinders.

With this exhaust setup, the exhaust pulses into each 3-1 collector for all these combinations are separated by 240 crank degrees.  The exhaust pulses are far apart and do not compete for flow area in the collector allowing for a relatively small collector outlet and resultant increased power band.  Also, unlike the 180 degree configuration necessary on the 90 degree V-8s, the header packaging is straight forward."

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