[Diy_efi] Tapping Metric Injector Threads

[Mike]

At 06:34 PM 1/8/03 +1300, you wrote:
>Haha... Alloy over here is short or Aluminium.

I think you mean 'Ally', the aluminium alloy in the
heads for my VL for example has traces of magnesium and
I think calcium... I've never heard anyone say 'Alloy' as
a euphemysim for Aluminium', its always been 'Ally' unless
the 'strine' is way way off !

>Tapping size for a 12 x 1.5 is 10.5mm.
>Try slightly smaller.. 1 13/32" maybe (which is 10.3mm - off top of my head)

I've noticed that on many occasions the recommended drill size for
doing a tapered seems to very often result in larger threads and hence
deeper ingres, sometimes the thread gives out before there's enough
torque/depth. So use some of that white teflon plumbers tape, very thin
and works well at underbody manifold temperatures, I have one on the
manifold relief valve plug - damn 1" plug.
Keeping the drill and the tap perfectly perpendicular makes a big
difference to the 'slack' in the resulting thread especially for Tapered
in 'Ally'.

>Use Kero as a cutting fluid.

But definitely not when honing bores...

rgds

mike



>-- 
>Matt Porritt
>RC Race Cars and Supplies
>ICQ #22776813
>
>
>On 8/1/03 3:18 AM Brian Michalk wrote
>
>> Alloy?  My scrap metl is 6061 aluminum.  I use way oil to lubricate; very
>> sticky stuff.
>> 
>> The 1.5 pitch is specifically for pipe threads which is why I thought it
>> would be tapered.
>> 
>> Will try a smaller bit tonight.
>
>
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