[Healeys] Carb Adjustment Help Requested - BJ8 MkIII

Bob England engl at accesscomm.ca
Sun Aug 13 22:06:01 MDT 2017


Back at home so had a chance to check my notes.

Compression was 150/155/153/159/164/154 which I thought was quite good.
Static timing attempt was 10 degrees but that did not turn out well.
Dynamic timing was spot on 15 degrees, but I couldn't get a good idle at 600
RPM (per the book) so I think I set it at 800 RPM.  Vacuum advance


-----Original Message-----
From: Engl [mailto:engl at accesscomm.ca] 
Sent: August 13, 2017 6:53 PM
To: David Porter
Cc: healeys at autox.team.net
Subject: Re: [Healeys] Carb Adjustment Help Requested - BJ8 MkIII


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>
> 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/

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