[Healeys] Carb Adjustment Help Requested - BJ8 MkIII

[Engl]

David 

Forgot to add the chokes were disconnected ... 

Bob England

> On Aug 13, 2017, at 6:53 PM, Engl <engl at accesscomm.ca> wrote:
> 
> David
> 
> Compression was good (actually really good!). 
> 
> I think I tried static timing at 5 degrees if I remember correctly. Dismal failure in my first try at static timing. Dynamic at 15 degrees at a bit above 750 with a strobe worked much better. 
> 
> I think these are the numbers I used ... not at home at the moment so I'll double check later. 
> 
> Bob England
> 
>> On Aug 13, 2017, at 5:20 PM, David Porter <frogeye at porterscustom.com> wrote:
>> 
>> what are the compression numbers? Timing is set at 750RPM and 6 degrees BTDC. Is it better or worse with chokes engaged? DP
>> 
>> 
>> 
>>> On 8/13/2017 3:23 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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>>> 
>> 
>> -- 
>> Dave Porter Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM 87107 505-352-1378 Go HERE: my world www.porterbikes.com/
>