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Stainless Cones ?
T66 - 18/1/13 at 01:03 PM

I am after 4 stainless cones, my plan is to cut the head ends off a stainless Blackbird manifold and weld cones onto the stock pipes, and open the pipe out to 50mm for my manifold.

The ones Ive found on the net are about £10 each, any better suppliers ? or anyone with a roller able to make some up for me ?



Stainless Steel Reducer Cone 2.5"' to 1.5"' 304 Exhaust grade adapter 63mm - 38mm

liam.mccaffrey - 18/1/13 at 01:19 PM

Personally I don't think thats a bad price. IMHO

matt_gsxr - 18/1/13 at 02:45 PM

You could make cones from straight tube, cut out a triangle, bend up with a ratchet strap and weld. That works for acute cones, but maybe not for the ones you want. You could embellish the approach by trimming out a triangle from both sides but I haven't tried that.

tilly819 - 18/1/13 at 02:51 PM

they look nice, correct me if im wrong but i seem to recall when making my blackbird manifold you standard pipes are 1.5 but you can just go straight onto the ring gasket with 1.75" dont know if this is any help to you, but might be worth looking into

Tilly

SPYDER - 18/1/13 at 03:32 PM

Have you considered a "stepped header" arrangement where the the step up in diameter is abrupt. No cones to buy or make.

Talon Motorsport - 18/1/13 at 06:47 PM

Do you know any body with a set of gas bottles and a lathe? Get the right size tube heat it untill it's red hot, spin the lathe with moderate rpm and expand with round piece of stock. A little tip have the ends of the round bar well rounded off and make sure it clears the bed guides in case it grabs, a bloke with 2 fingers missing told me that.

T66 - 18/1/13 at 08:15 PM

quote:
Originally posted by Talon Motorsport
Do you know any body with a set of gas bottles and a lathe? Get the right size tube heat it untill it's red hot, spin the lathe with moderate rpm and expand with round piece of stock. A little tip have the ends of the round bar well rounded off and make sure it clears the bed guides in case it grabs, a bloke with 2 fingers missing told me that.





MMMmmmmm - Have lathe and have decided to give this one a miss



What I have worked out is, there is the option to make them myself, bugger about for a day throwing sheet stainless in the bin, or just buy x4 for £40.....


Quality Locost posts as always, we cut corners together.....

bi22le - 18/1/13 at 08:43 PM

quote:
Originally posted by matt_gsxr
You could make cones from straight tube, cut out a triangle, bend up with a ratchet strap and weld. That works for acute cones, but maybe not for the ones you want. You could embellish the approach by trimming out a triangle from both sides but I haven't tried that.


Thats a great shout.

Me and the wife (chartered engineer) chucked maths around for a whole weekend working out the shape of a sheet that needs to be cut for a cone off angle that was required.

We got it in the end and made it up, realised the air flow was awful!!!!

I would go for £40 depending how urgent I wanted on the road, with the snow coming down, waste some metal!!

T66 - 18/1/13 at 10:01 PM

quote:
Originally posted by bi22le
quote:
Originally posted by matt_gsxr
You could make cones from straight tube, cut out a triangle, bend up with a ratchet strap and weld. That works for acute cones, but maybe not for the ones you want. You could embellish the approach by trimming out a triangle from both sides but I haven't tried that.


Thats a great shout.

Me and the wife (chartered engineer) chucked maths around for a whole weekend working out the shape of a sheet that needs to be cut for a cone off angle that was required.

We got it in the end and made it up, realised the air flow was awful!!!!

I would go for £40 depending how urgent I wanted on the road, with the snow coming down, waste some metal!!





Im sitting thinking homemade wooden cones to size , wrapped in paper for templates, then waste lots of stainless sheet trying to get a cone....


£40 is now looking a bargain .....withdraw my earlier post

dave r - 19/1/13 at 07:45 AM

anyone who can remember their tech drawing classes from school would be able to develop that for you

i could have in the 80's but not done it since!

welderman - 19/1/13 at 08:00 AM

What sizes are you after, I can sewage a pipe up to approx 100 long

T66 - 19/1/13 at 08:16 AM

Morning Joe



4x - to mate the 33mm OD Blackbird pipe, to the 50mm pipes I intend using on the manifold?


welderman - 19/1/13 at 08:58 AM

Will check tube on Monday and see if former will stretch tube

mark chandler - 19/1/13 at 09:18 AM

quote:
Originally posted by matt_gsxr
You could make cones from straight tube, cut out a triangle, bend up with a ratchet strap and weld. That works for acute cones, but maybe not for the ones you want. You could embellish the approach by trimming out a triangle from both sides but I haven't tried that.


I split the tube into 2 segments and added triangles, see below, it needed polishing afterwards.

No reason not to split into 4 segments for a 4 into 1.

You make a star for the inside entry and weld the pipes to this then sleeve with the new cone, you can also get the correct angles with ease like this.

For the triangle fillers I used the same tube, just split and flattened for some sheet stainless

NS_engine_exhaust_7oct2006
NS_engine_exhaust_7oct2006

[Edited on 19/1/13 by mark chandler]

T66 - 19/1/13 at 09:32 AM

quote:
Originally posted by welderman
Will check tube on Monday and see if former will stretch tube





Cheers Joe......






That manifold looks fine, is there a closer in picture? Cheers

coozer - 19/1/13 at 12:39 PM

These what your after mate?

http://www.dairybits.co.uk/Mechanical_and_Tools/Piping_Fittings_and_Couplings/Stainless_Steel_Fittings/p-5.html

T66 - 19/1/13 at 06:01 PM

quote:
Originally posted by coozer
These what your after mate?

http://www.dairybits.co.uk/Mechanical_and_Tools/Piping_Fittings_and_Couplings/Stainless_Steel_Fittings/p-5.html





MrCoozer good find......