[Healeys] 100 carb balance pipe

[Curtis Arndt]

Hi Bob,

The studs you linked to are not correct as they are Cycle threads (CEI -
Cycle Engineer Institute) on one end.  CEI threads are NOT Whitworth even
though they are British threads as they have a 60 degree pitch angle of the
threads versus the 55 degree pitch angle for ALL Whitworth form fasteners.

One solution I've seen that is easy is to just remove the studs and replace
them with four short 1/4" BSF hex bolts in order to attach the balance
pipe.   Not Concours but it works well.

Curt.

On Sat, Apr 25, 2015 at 4:19 AM, Bob Haskell <rchaskell at earthlink.net>
wrote:

> Thanks for the info.  The ones that I took off the manifold were brass
> threaded rod and the threads had stripped under the nuts.  I made some by
> cutting the heads off steel cheese head screws. It looks like British
> Fastener's may have the stud -
> http://britishfasteners.com/studs/bsf-bsf-studs/bsf-cei-1-4-x-1-long-stud-26-26-tpi-36.html
>
> Cheers,
>
> Bob Haskell
> AHCA 3000 Mk I registrar
> http://www.ciahc.org/registry_3000mk1.php
>
> On 04/24/2015 05:37 PM, Michael wrote:
>
>> Curt is correct...what's new...
>> BSF both ends.
>>
>> Michael S
>> BN1 #174
>> ------------------------------------------------------------------------
>> From: Curtis Arndt <mailto:cnaarndt at gmail.com>
>> Sent: ‎24/‎04/‎2015 2:23 p.m.
>> To: Bob Haskell <mailto:rchaskell at earthlink.net>
>> Cc: Healey List <mailto:healeys at autox.team.net>
>> Subject: Re: [Healeys] 100 carb balance pipe
>>
>> Hi All,
>>
>> I believe (almost certain) that the 1/4" studs on the manifold are BSF
>> on BOTH ends.  IF they were coarse threaded into the aluminum they would
>> be BSW, to match the BSF Whitworth threads on the other end.
>>
>> Cheers,
>>
>> Curt
>>
>> On Thu, Apr 23, 2015 at 4:09 AM, Bob Haskell <rchaskell at earthlink.net
>> <mailto:rchaskell at earthlink.net>> wrote:
>>
>>     Alan,
>>
>>     The threads are definitely BSF in these manifolds, but you're right
>>     - coarse thread is usually the case in aluminum.
>>
>>     Thanks,
>>
>>     Bob Haskell
>>     AHCA 3000 Mk I registrar
>>     http://www.ciahc.org/registry_3000mk1.php
>>
>>     On 04/23/2015 06:21 AM, Alan Seigrist wrote:
>>
>>         Bob -
>>
>>           From memory I believe they have a section that isn't threaded
>>         in the
>>         middle, with coarse thread to go in the manifold and fine thread
>>         for the
>>         nut.
>>
>>         Then again I probably have no clue what I'm talking about.
>>
>>         Alan
>>
>>         On Thu, Apr 23, 2015 at 6:01 PM, Bob Haskell
>>         <rchaskell at earthlink.net <mailto:rchaskell at earthlink.net>
>>         <mailto:rchaskell at earthlink.net
>>         <mailto:rchaskell at earthlink.net>>> wrote:
>>
>>              Listers,
>>
>>              The balance pipe is attached to each intake manifold with
>>         two studs.
>>              Are the studs just threaded rod, or is there a non-threaded
>>         section in
>>              the middle?  Assume that they're steel and overall length
>>         an inch.
>>              Threads are 1/4-26 (BSF/BSC).
>>
>>              Cheers,
>>
>>              Bob Haskell
>>              AHCA 3000 Mk I registrar
>>         http://www.ciahc.org/registry_3000mk1.php
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