[Healeys] Carb Adjustment Help Requested - BJ8 MkIII

Engl engl at accesscomm.ca
Sun Aug 13 21:39:43 MDT 2017


I did not confirm the needles, but should be able to tomorrow night. Thanks. 

Bob England

> On Aug 13, 2017, at 7:05 PM, Bob Haskell <rchaskell at earthlink.net> wrote:
> Bob,
> When you had the carbs apart, did you confirm that the needles were correct? The needle part number is normally stamped on the base of the needle.
> Cheers,
> Bob Haskell
> AHCA 3000 MkI registrar
> http://www.ciahc.org/registry_3000mk1.php
>> On 08/13/2017 05:23 PM, Bob England wrote:
>> I've had a rough idle in the car since we picked it up in May and it seems
>> to have gotten worse ever so slightly since then.
>> I've putzed around trying the easy stuff and finally got the bullet and
>> pulled the carbs yesterday (that was fun!) as one of the carb pistons was
>> sticking ever so slightly.  Stripped the carbs except for the throttle shaft
>> and found the floats were set a bit low.  Put it all back together and still
>> having an issue as she is running quite rich, hence the call for help.
>> Car: late '64 build BJ8 MkIII
>> Carbs : HD8 (I think they were new about 15 years ago - not original to
>> car).
>> Cam : Dennis Welch DWR-1 (installed about 15 years ago).
>> Distributor : stock with Petronix Ignitor (Petronix installed last weekend
>> in the hopes it would help).  New rotor.
>> Coil : Lucas Sportcoil
>> Plugs : new Autolite gapped at 25 (installed a couple of weekends ago)
>> Timing : 15 degrees with strobe (my attempt at static timing was a dismal
>> failure!).
>> I set the carbs as per the manual - 3.5 turns open on the idle trim screws
>> and 2.5 turn rich on the jet adjusting screw.  Fast idle adjusting screw
>> completely off of the cam lobe.
>> The best I can get it is with the jets totally lean (i.e. not sitting on the
>> cam lobe) and the fast idle screws setting the idle speed.  Idle trim screws
>> backed way out with little impact on idle.  Carbs are still running rich.
>> I think I have memorized the adjustment procedure from the manuals I read
>> them so many time - (Bentley, BMC, and Haynes), and Norman Nock's wonderful
>> collection of papers.
>> Should I be going to a leaner needle in the carbs?  Or am I just screwing up
>> somewhere?  This is my first attempt at adjusting SU's and I'm not too happy
>> with what I have done so far.
>> Any and all suggestions appreciated (except maybe if I have to yank the
>> carbs again).
>> Thanks in advance.
>> Bob England
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