[Healeys] Carb Adjustment Help Requested - BJ8 MkIII

Mon Aug 14 10:06:35 MDT 2017

In general, a total advance exceeding 34 degrees is bad news in many 
engines. Big end bearings, piston pins and pistons will suffer.
Kees Oudesluijs

Op 14-8-2017 om 17:12 schreef David Porter:
>
> yeah.. I get that. It's just that for ANY stock engine to have more 
> than 10 degrees initial is unusual.. sure they seem to run better, but 
> when the total is too high bad things will happen in due course...
>
>
> On 8/14/2017 7:33 AM, BJ8Healeys wrote:
>>
>> Dave, I'm not the one having the problem and asking the question; but 
>> I was responding to your statement that the timing is set to 6° @ 750 
>> RPM, which does not agree with what is published in the BMC workshop 
>> manual for the Mk III engine (see attached).  My Glenn's AUSTIN 
>> AUSTIN-HEALEY REPAIR AND TUNEUP GUIDE (copyright 1965, and also says 
>> CHILTON 1432 on the spine) gives the same numbers as the BMC manual.  
>> I do understand what you mean about the advance (I have a Mallory 
>> Dual-Point distributor with mechanical advance only), but questioned 
>> where your numbers came from.
>>
>> Steve Byers
>>
>> HBJ8L/36666
>>
>> BJ8 Registry
>>
>> AHCA Delegate at Large
>>
>> Havelock, NC
>>
>> -----Original Message-----
>> From: David Porter [mailto:frogeye at porterscustom.com]
>> Sent: Monday, August 14, 2017 8:53 AM
>> To: BJ8Healeys; healeys at autox.team.net
>> Subject: Re: [Healeys] Carb Adjustment Help Requested - BJ8 MkIII
>>
>> 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 <mailto: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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>>
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>>
>> >>
>>
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>>
>> > http://autox.team.net/mailman/options/healeys/frogeye@porterscustom.co
>>
>> > m
>>
>> >>
>>
>> >>
>>
>> --
>>
>> Dave Porter Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM
>>
>> 87107 505-352-1378 Go HERE: my world www.porterbikes.com/ 
>> <http://www.porterbikes.com/>
>>
>> ---
>>
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>>
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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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