[Healeys] Carb Adjustment Help Requested - BJ8 MkIII
rchaskell at earthlink.net
Sun Aug 13 19:05:59 MDT 2017
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
AHCA 3000 MkI registrar
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
> 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
> 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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