I am after making some stainless header tanks for cars BUT i need to find somwhere that will be able to supply me with the screw lids.
I dont know where to even start looking
To give people an idea
i want the thredded part and the blue screw top
Aalco do ss pipe fittings, also Axium process do that sort of stuff...
Allstainless aswell.
Quite a few places id expect to do something lkike what you want, dairy fittings etc.
You could get anyone with a lathe that has a leadscrew to singlepoint cut a thread onto a tube to form the filler neck for you if they have the right changewheels to generate the thread you need.
Doesnt need to be cnc, if you have someone living near you with a lathe in his shed who needs some beer tolkens...
I asume initially that you will not be making many.
Wouldnt bother with a cnc places, too costly bear in mind they will have to recoup the setup and proggy for the quantity required.
Same with an auto or capstan lathe but should be cheaper.
Find a nice threaded cap (blue) then see what thread it is.
There is a very cheap and simple way plus easy to weld on.
Knocked up a couple of catch tanks last year one in cf, minimum of 2 1/2 mpg better fuel consumption.
Got me thinking now beardy, the piccy looks around 22 to 25mm dia, these fillers are usually in the region of 1 3/4" with a male stub and female cap thread.
Nothing stopping you reversing the arrangement, should be easier.
Specials or one off caps could be done and still come in less than a Bailey. These two parts only need to thread together and create a suitable sealing pressure, there are different methods.
Will need to have a presure release valve too. Its normaly part of the cap but if you are replacing it with a nut / bolt then you will need one. What about having the existing platic one plated with some sort of steel coloured coating?
Not positive whether it has to have a valve and would need checking. Unless they have an ultra fine hole somewhere all the cars i have had i have never noticed. Usually like a diaphram seal that seals when tightened on to the plastic expansion tank, got me intrigued now might have a look.
This has an inbuilt valve, not the best http://pic20.picturetrail.com/VOL15/728921/6962373/304110555.jpg