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[Healeys] Tapping SUs for air filters.

To: "Healeys" <healeys@autox.team.net>
Subject: [Healeys] Tapping SUs for air filters.
From: <simon.lachlan@alexarevel.plus.com>
Date: Thu, 22 Nov 2018 14:15:10 -0000
Delivered-to: mharc@autox.team.net
Delivered-to: healeys@autox.team.net
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I'll be removing my carbs soon in order to achieve clearance for raising
(the front of) the engine. (Harmonic balancer installation).

So, it struck me that I may give my 3 HD6s another go. Swap them with the
current setup.

Thinking it through and looking at the big box of bits, I recalled what a
pain it is to get the nuts and two washers onto the bolts that hold on the
air filters. I have French manufactured K&N lookalikes. The bolt starts
inside the filter, goes through the carb and gets two washers and a nut.
Very awkward to deal with those nuts and washers. PITA.

I thought that I might put in helicoils then I thought "Why not tap the
holes?"

The holes on my HD6s are 11/32" or 8.8mm.

I am no engineer but it seems to me, from looking at tables on Google, that
I could use a 25/64" drill bit and tap them out to 7/16". I have both the
drill and the tap but would like some expertise applied to the issue before
I start drilling.

Any input would be much appreciated.

Thanks,

Simon


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link=3D"#0563C1" vlink=3D"#954F72"><div class=3DWordSection1><p =
class=3DMsoNormal>I&#8217;ll be removing my carbs soon in order to =
achieve clearance for raising (the front of) the engine. (Harmonic =
balancer installation).<o:p></o:p></p><p class=3DMsoNormal>So, it struck =
me that I may give my 3 HD6s another go. Swap them with the current =
setup.<o:p></o:p></p><p class=3DMsoNormal>Thinking it through and =
looking at the big box of bits, I recalled what a pain it is to get the =
nuts and two washers onto the bolts that hold on the air filters. I have =
French manufactured K&amp;N lookalikes. The bolt starts inside the =
filter, goes through the carb and gets two washers and a nut. Very =
awkward to deal with those nuts and washers. PITA.<o:p></o:p></p><p =
class=3DMsoNormal>I thought that I might put in helicoils then I thought =
&#8220;Why not tap the holes?&#8221;<o:p></o:p></p><p =
class=3DMsoNormal>The holes on my HD6s are 11/32&#8221; or =
8.8mm.<o:p></o:p></p><p class=3DMsoNormal>I am no engineer but it seems =
to me, from looking at tables on Google, that I could use a 25/64&#8221; =
drill bit and tap them out to 7/16&#8221;. I have both the drill and the =
tap but would like some expertise applied to the issue before I start =
drilling.<o:p></o:p></p><p class=3DMsoNormal>Any input would be much =
appreciated.<o:p></o:p></p><p class=3DMsoNormal>Thanks,<o:p></o:p></p><p =
class=3DMsoNormal>Simon<o:p></o:p></p></div></body></html>
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