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Injector stacks


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K&S aluminum tubing , you can try to flare it with an awl or similar tool by placing it in a slightly larger tube and rotating the awl then cutting to size. but it is hard to get consistent results . frankly the AMT set isn't that pricey when you think about the time spent making them . also there are some on ebay that are slightly cheaper than the AMT set you just have to search a little bit .you can also check out the jewelry section at Michaels ,Jo ann or other craft stores for items that may capture the look you want . hope this is helpful.

Edited by randx0
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Good tip Bill.

Thanks.

These ferrules are available in Australia from RS Components at $12 for 100.

https://australia.rs-online.com/web/p/crimp-bootlace-ferrules/2114325/?searchTerm=211-4325&relevancy-data=636F3D3126696E3D4931384E525353746F636B4E756D6265724D504E266C753D656E266D6D3D6D61746368616C6C26706D3D5E5C647B337D5B5C732D2F255C2E2C5D5C647B332C347D2426706F3D313426736E3D592673743D52535F53544F434B5F4E554D424552267573743D3231312D343332352677633D4E4F4E4526

One thing though. If you follow Bills link it takes you to the page for 18 AWG ferrules. These are just over 1mm in diameter (1" in 1/25) which seems small to me.

For 2mm (scale 2") diameter stacks order 12 AWG ferrules or for 2 1/2mm (scale 2 1/2") order 10 AWG.

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Good tip Bill.

One thing though. If you follow Bills link it takes you to the page for 18 AWG ferrules. These are just over 1mm in diameter (1" in 1/25) which seems small to me.

For 2mm (scale 2") diameter stacks order 12 AWG ferrules or for 2 1/2mm (scale 2 1/2") order 10 AWG.

Correct, but the same website has a wide variety of sizes for various scales and applications.

Scroll down that page for more sizes.

Edited by Ace-Garageguy
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Best way to cut them down is to find a rod that will fit snugly inside them and then using a block so as not to crush the flare roll a knife backwards and forwards at the point where you want to cut.

I knew there were other sizes Bill. I just didn't want someone to click and order without checking the size.

I just got a bag of 10AWG delivered and they are 3mm internal diameter not 2 1/2 as I state above (which I calculated from a wire sizing chart that gave the cross sectional area of various size wire). Obviously there's a bit of slack allowed for an easy fit over the wire.

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Probably 12 or 14 AWG but without actually having had any in my hands to measure I couldn't be absolutely sure.

I'd guess those stacks would be 2 1/2 inch diameter meaning you want 2 1/2mm inside diameter ferrules.

If you can get them from an actual store (rather than the interweb) then you have the luxury of being able to take a ruler with you to measure them before you buy them.

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One thing to bear in mind when building a model is what kind of engine it has and what kind of racing it would actually do. If you go beyond building for a 'look' and not caring about how things work, just remember that injector stacks are tuned to a particular rev range on a particular engine, and show up in the real world in any length imaginable.

Short stacks will usually be on an engine that winds tight and makes its peak power at high RPM, like the small-displacement Cosworth Ford V8. Longer stacks help low-end torque, so you'll tend to see them more on drag-racing engines that need grunt off the line. BUT...that's not always true. Just do a google image search for "hilborn injection".

You might also notice that some racing engines use staggered stacks, to broaden the torque curve.

1176244071_8410.f_magi_grs.jpg

Edited by Ace-Garageguy
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