[Healeys] Tapping SUs for air filters.

Michael Salter michael.salter at gmail.com
Thu Nov 22 11:46:43 MST 2018

Better still get some of these:


On Thu, Nov 22, 2018, 12:48 PM Bob Spidell <bspidell at comcast.net wrote:

> I've not tried this, but my first thought is that the aluminium bodies of
> the SUs would be too soft; eventually, you might strip the threads (esp. if
> trying to get a good seal with the filter).  Why not do what you're likely
> to end up doing anyway: installing thread inserts (Helicoil or similar).  I
> think 5/16" bolts would be sufficient.
> Bob
> On 11/22/2018 6:15 AM, simon.lachlan at alexarevel.plus.com wrote:
> 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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