Tubular inlet manifold

[redhatman]

Can anybody recomend a company to fabricate a 4 cylinder tubular inlet manifold..?

[zefarelly]

I made a jig and make my own but they're in pairs with laser cut flnges, the tapered tubes are the hard bit, especially if they're not straight

maniflow do something long those lines for the A series . . .worth a call perhaps, or any decent ex manifold fabricator

[XKRacer]

I made my own, I could make some for you depends on what it is for I would need dimensions, centres etc



These were obviously for my V8 but I could just do half

[R59]

'ere Gordon - they don't half look like Wal Phillips Fuel Injectors!!

[GORDON STREETER]

Wal Phillips ! Christ you go back a fair way. They were the business on bikes years ago and a mate had 4 on his Hot Rod

[R59]

Somewhere in my workshop I have one..... it was once on an Austin 1100 oil burning grot box.

[eamonn ledwidge]

Try David Dorrington at Maniflow in Salisbury.

Originally Posted by redhatman

Can anybody recomend a company to fabricate a 4 cylinder tubular inlet manifold..?

[redturner37]

Try Gran-Fabrications in Bulwell, Nottingham, a real craftsman in stainless or ally. Ask for Andy on 0115 9761864

[zefarelly]

Wal Philips, I always wanted one for my Lambretta

[phoenix]

You could try Prospeed Motorsport - they are making an inlet manifold for me at the moment.

olly@prospeed-motorsport.co.uk

[greenamex2]

If it's a normal round hole, even if if tapered then any decent fabricator could make it.

If it is a hideously complicated round hole tapered to an oval hole like on mine, after 9 months of searching and £250 wasted on a complete pile of junk, I managed to find an ex-F1 engineering company to make one. The runners were made on a 5 axis CNC mill.

And it was hideously expensive. But I could always get my money back selling cast copies!

Let me know if you need their details.

[XKRacer]

Originally Posted by Denis Bassom

If it's a normal round hole, even if if tapered then any decent fabricator could make it.

If it is a hideously complicated round hole tapered to an oval hole like on mine, after 9 months of searching and £250 wasted on a complete pile of junk, I managed to find an ex-F1 engineering company to make one. The runners were made on a 5 axis CNC mill.

Thats how mine were, 50 x 26, the way I did it....I taper turned from 50 to 26 mm over the length of the manifold I wanted, then got a 25mm long series end mill and slotted the bottom out to 50mm and opened out the width to clean.
I also had the joy my jenvey's were on a slightly different centres to my ports so I had to compensate and angle the tubes and then machine flat once I welded them up, I spose in hind sight individual TBs rather than twins might of been a better way to go.....You live and learn

[greenamex2]

Mine is worse.

The 'oval' is so short and wide that is significantly overlaps the circle.

And they both have the same surface area (hence all the cobblers on the 4AGE engine about the later head being better, people just understand what happens to a gas in a reverse taper followed by a normal taper when they fit too small a throttle body).

So you end up 'tapering' in all directions.


I spent about 9 months of -

Can you make some inlet manifold runners?

Yes, no problem.

They go from circle to a flattened oval.

Of course, piece of cake.

Here is the CAD drawings.

........Oh.......Sorry........Ha Ha Ha, that will cost you a fortune, good luck finding someone.


Eventually I ended with an F1 engineering company that had just lost their contract and had a bunch of 5 axis (or better) mills lying around don't nothing.

The normal manifold for the engine has offsets all over the place and unequal runner lengths and volumes. Still not totally sure if it was worth the effort and expense though, should know in a couple of weeks.