[Healeys] Carb Adjustment Help Requested - BJ8 MkIII
bspidell at comcast.net
Mon Aug 14 12:24:35 MDT 2017
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.
> 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
>>> BJ8 Registry
>>> AHCA Delegate at Large
>>> Havelock, NC
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