[Healeys] Carb Adjustment Help Requested - BJ8 MkIII

[Bob Spidell]

Should be "further recessed in the HEAD than the earlier engines"


On 8/14/2017 9:18 AM, Bob Spidell wrote:
>
> I just tore down a BJ8 engine with about 110K miles since rebuild.  I 
> always ran at 15deg per the manual and there was no damage to any of 
> the pistons or rings (see attached).  Of course, I always ran 
> 91-octane or better gas (except on a couple occasions when it wasn't 
> available).  I never heard any knock, but my co-pilot on my long trips 
> said he did when I inadvertently lugged the engine a couple times.
>
> Somebody did a 'study' on why the BJ8 engine needed so much initial 
> advance, I believe the theory is that the plugs are set further 
> recessed in the plug than the earlier engines.
>
> Bob
>
>
> On 8/14/2017 8:12 AM, David Porter wrote:
>>
>> 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
>>>
>>>
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>

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