Inlet Manifold

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Re: Inlet Manifold

Postby Martin Kemp » Sat Feb 20, 2021 10:40 pm

It's working for me

Martin
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Re: Inlet Manifold

Postby F1300Tony » Mon Feb 22, 2021 12:08 pm

Nice job, Dave. Starting with the CAD, that is a lot of work. According to 750F myth it should have been cast from empty beer cans.
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Re: Inlet Manifold

Postby Dave Robson » Mon Feb 22, 2021 2:39 pm

Thanks Tony. Yes the CAD design took me ages with lots of re-work. It was a steep learning curve. Whether it results in a better product is to be seen. In some ways it was an ideal project whilst I was locked in. The furnace design and construction was another development project that has eventually works and seems to be reliable. The source of aluminium is from broken up A Series gearbox castings. (I don't drink enough beer!)
Dave

Manifold Body.jpg
CAD screenshot of manifold pattern
Manifold Body.jpg (72.84 KiB) Viewed 85 times
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Re: Inlet Manifold

Postby Martin Kemp » Mon Feb 22, 2021 3:50 pm

Did you shell the inside or are the airways a separate model subtracted from the outside,

Martin
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Re: Inlet Manifold

Postby Dave Robson » Mon Feb 22, 2021 5:31 pm

Martin,
I developed the 'airways' and then shelled externally to create the mould for the core. This was split horizontally. See picture.

The pattern for the manifold body came from the same 'airway' and was also shelled externally, flanges added, core imprints added, made solid and then split horizontally.

This is why my beard is grey !!

Dave

Core mould.jpg
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Re: Inlet Manifold

Postby Martin Kemp » Mon Feb 22, 2021 10:07 pm

That's the way I would do it too.
It would interesting to rapid prototype a manifold with SLS Polyamide. It might be difficult to get it to support the mass of a Weber but a Tillotsen would be no problem. The cost for such a large item might rather higher than for a steel fabrication though,

Martin
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Re: Inlet Manifold

Postby F1300Tony » Tue Feb 23, 2021 12:20 pm

For 2013 we had a very long manifold made in nylon 6 with an internal coating to make it resistant to fuel. It didn't work due to fuel pooling, not because of the material. When the throttle was closed the pool evaporated and wet the plugs, and then it took out the head gasket. The weight of the 45DCOE was taken by a strut from the engine.
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