[Healeys] Carb Adjustment Help Requested - BJ8 MkIII

David Porter frogeye at porterscustom.com
Mon Aug 14 06:52:47 MDT 2017

Steve, my Glenn's book shows the dist as 40966A/B with centrifugal 
advance starting at 500RPM with 7.5 degrees, max centrifugal adds 19 
more degrees at 3200RPM plus another 8 for the vacuum advance giving a 
total max of 34.5 degrees. Thus if at 3200RPM your total is more than 
34.5 back off the initial. If your strobe light won't allow you to 
calculate total, get one that will. ;~) Healey engines are very good at 
not pinging audibly. Can't count the number of engines I've seen with 
damaged ring lands from too much advance.

On 8/13/2017 6:41 PM, BJ8Healeys wrote:
> Dave, are you sure about those numbers?  I believe the manual specifies 10
> BTDC static and 15 BTDC @ 600 RPM.
> Steve Byers
> HBJ8L/36666
> BJ8 Registry
> AHCA Delegate at Large
> Havelock, NC
> -----Original Message-----
> From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of David
> Porter
> Sent: Sunday, August 13, 2017 7:20 PM
> To: Bob England; healeys at autox.team.net
> Subject: Re: [Healeys] Carb Adjustment Help Requested - BJ8 MkIII
> 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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