[Spridgets] pinking problem

Jim Johnson bmwwxman at gmail.com
Mon Aug 4 12:37:11 MDT 2008


Ah!!  That's better!  You have a mechanical advance!   Jeff is good at this
stuff - way better than me!

Didn't you say you were using low octane rated gas?  Try it with high
octane.  Low octane gas takes longer to detonate. To compensate I advance
the spark a little.

Cheers!!
Jim

On 8/4/08, Marc <smarc at smarc.net> wrote:
>
>  OK, this is two different issues I think - One is the pinking problem. As
> explained to me, there is some mechanical advance (counter weight driven)..
> I have never had the vacuum unit hooked up. The diaphragm on the disty was
> ruptured when I got the car, so I capped it off to seal the resultant vacuum
> leak.
>
> This is the second issue - now that I have the disty rebuilt, I'm unable to
> hook it up as it vibrates rapidly. Jeff @ advance told me that would destroy
> the new diaphragm, so it's never been hooked up. Perhaps me asking about the
> second problem in the same email is confusing the issue.
>
> Jim Johnson wrote:
>
> I'm not entirely sure about this, but if you don't have the vacuum advanced
> hooked up, you won't have enough advance at higher revs? I can only guess
> that the diaphram is vibrating rapidly because it is expecting vacuum and is
> not getting it???  Are you talking about the diaphram in the vacumm advance
> unit?  You have to have *some* spark advance at higher rpm or the timing
> will be off even at cruising speeds.
>
> Cheers!!
> Jim
>
> On 8/4/08, Marc <smarc at smarc.net> <smarc at smarc.net> wrote:
>
>   I can't hook it up, as the diaphram is vibrating rapidly - don't want to
> destroy a newly rebuilt vac unit.... Oh, and to answer the earlier question,
> the vac line is hooked to the manifold. Am I to understand this is
> incorrect?
>
> Jim Johnson wrote:
>
> Marc,
>
> Do you mean you have been driving the car without the vacuum line hooked
> up? Reconnect it and tell us what it does.
>
> Knocking/pinging related to timing problems/too low octane/improper valve
> lash...etc usually is most noticeable under load. Engine overheating can
> cause it as can an improperly torqued knock sensor on engines so equipped.
> Again, however, it should be most noticeable under load (acceleration or
> driving uphill).  A knock or ping while not under load may be something more
> diabolical...
>
> On 8/4/08, Marc <smarc at smarc.net> <smarc at smarc.net> wrote:
>
>  What I wasn't clear about is the advance has NOT been hooked up at all.
>
>
> Billy Zoom wrote:
>
>  It generally occurs (or is only noticeable)
> under extremely light throttle -
>
>            Do you have it hooked up to manifold vacuum instead of venturi vacuum?
>
>
>
> --
>
> Marc
>
>


-- 
Cheers!!
Jim


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