[Healeys] Timing mark

[David P]

Didn't you say your strobe showed 15? best bet is to always make sure 
you don't exceed the total advance at 4500RPM 34-36 is a safe range. the 
original distributors start advance at ~750 RPM, so make sure you set 
initial at that low RPM not at 1000.  Unless you have degree wheeled the 
valve timing, which could vary by 5 degrees on either side, I'd rely on 
the ignition timing with a good strobe light. Dave


On 4/24/2019 7:50 AM, simon.lachlan at alexarevel.plus.com wrote:
>
> Thanks for this.
>
> My notes tell me that Denis Welch, the man himself, advised:-
>
> “a)       Static:-100 degrees ATDC on No1 when it’s inlet is fully open.
>
> b) Running: 12-15 degrees BTDC @1000 rpm
>
> 33-38 degrees max @ max rpm (just before it starts to pink)”
>
> And, when I bought their “Fast Road” cam, son Jeremy advised:-
>
> “15° to 18° @ 1,000rpm
>
> 34° to 38° @ 4,500rpm”.
>
> Most people seem to go for 15° as a start point. Or that’s what I 
> thought…between us are we confusing static with stroboscopic timing?
>
> Simon
>
> *From:*Healeys <healeys-bounces at autox.team.net> *On Behalf Of *David P
> *Sent:* 24 April 2019 14:17
> *To:* healeys at autox.team.net
> *Subject:* Re: [Healeys] Timing mark
>
> My question is why are you running it a twice the advance the factory 
> advises? Excellent way to introduce preignition.
>
> On 4/24/2019 6:21 AM, simon.lachlan at alexarevel.plus.com 
> <mailto:simon.lachlan at alexarevel.plus.com> wrote:
>
>     I bought a ProRace Harmonic Balancer a few months back and
>     installed it whilst attending to some other engine chores….new oil
>     pump, engine mounts, reverting to SUs from Webers etc.
>
>     Soooo….I was given sensible advice to mark the 15° line on the
>     balancer as the markings are virtually invisible once the thing’s
>     installed, let alone spinning at +/- 1,000rpm.
>
>     Now for the confession. The car’s not been running
>     brilliantly….some hesitation, particularly under load, from +/-
>     4,000 rpm. Leaving out fuel issues for the sake of this
>     discussion, I was thinking about the timing again. And I know that
>     it’s been showing 15° BTDC with my brand new timing light. But I
>     was still not sure so I looked at the photo of my painted timing
>     mark. It shows that I managed to put the paint on the 16/°/ mark.
>     Now, 1° isn’t a lot but I can foresee the potential of making it
>     worse when I take up the lamp again.
>
>     My question is this. What do I dial into the timing light to
>     account for the mark being 1° out? (If I go the wrong way, I’ll be
>     2° out).
>
>     Thanks,
>
>     Simon
>
>
>
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-- 
Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM. 505-352-1378 My World go here: WWW.PORTERBIKES.COM/

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