Re: [Chrysler300] Timing is everything

[<smopar@xxxxxxxxxxxx>]

Removing the vacuum line and plugging it is a precaution.  Sometimes if the idle speed screw is set too high, for example if the idle mixture screws are set too lean, and the spark advance port is uncovered by the throttle plate, then vacuum advance could be present under idle conditions.  If this were the case, it would lead to a retarded basic timing setting, and the amount it would be off would depend on how much of the vacuum advance port was uncovered when the setting occurred.  Removing the vacuum line just ensures the basic timing is accurate and most of the time if you don't remove the line, you end up allright anyway.   The basic purpose isn't to ensure the idle is smooth when setting the timing.
Steve Albu

---- Rich Barber <c300@xxxxxxx> wrote: 
> Can it be confirmed that the vacuum line from the manifold should always be
> plugged during timing setting?  Seems it was routine, and in theory would
> not matter much except to make idle smoother while setting timing.
> 
> And, could I ask again for opinions on best readily-available spark plugs
> for the 1955 331 hemi 300?  Resistor, vs non-resistor, brand and identifying
> letters and numbers.  1955 Shop manual says "Resistor 4GS-175, 14 mm, .035
> gap" for NY & Imp-no entry for 300's.  Same plugs for NY & Imp?  I couldn't
> find a torque recommendation, but was reminded to remove the spark plug
> gasket.
> 
> C-300'ly,
> Rich Barber
> Brentwood, CA
> 1955 C-300
> 
> -----Original Message-----
> From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On
> Behalf Of smopar@xxxxxxxxxxxx
> Sent: Sunday, August 13, 2006 1:23 PM
> To: Tomas Turovaara
> Cc: Chrysler300@xxxxxxxxxxxxxxx
> Subject: Re: Fw: [Chrysler300] 1961 300 G
> 
> The purpose of the dashpot in this application is to open the throttle when
> a stall is imminent, not to slowly close the throttle as in most dashpot
> applications as indicated below (e.g., manual transmissions on cars of the
> 80's usually for emission purposes).   Due to the long runner lengths,
> sudden stops and rapid throttle closures could induce conditions that could
> lead to a stall if not compensated for.  Thus, when manifold vacuum drops,
> the stem should extend to the normally off position and open the throttle to
> prevent a stall.  The idle speed should be set with the engine running and
> the stem retracted.  I haven't done the adjustment for at least 10 years
> now, so maybe I am off, but this is what I recall.
> Agreed that timing should be set with a timing light only and vacuum advance
> line disconnected during the setting.
> Regards
> Steve Albu
> 
> ---- Tomas Turovaara <tomas.turovaara@xxxxxxxxx> wrote: 
> > Hi Michael and club members
> > I don´t understand how this unit working I have tryed on my car and the
> unit can only retract it newer extend  when I put a vacuum pump on the unit
> it only retrac when I add vacuum to it.
> > So the plunger will never  touch the carb butterflies.
> > is my unit wrong adjusted.
> > Maybe somone can give me information about this.
> > 
> > Tomas Turovaara Sweden
> >  
> > ----- Original Message ----- 
> > From: Michael Reed 
> > To: Tomas Turovaara 
> > Sent: Tuesday, August 08, 2006 8:58 PM
> > Subject: Re: [Chrysler300] 1961 300 G
> > 
> > 
> >   1.. can some one describe   how it should work the anti stall unit ?
> > 
> >     when the accelerator is released, the plunger on the antistall unit
> extends, preventing the carb butterflies from suddenly closing, which in
> turn often would stall the engine. In other words it allows the butterflies
> to close the last little bit slowly.
> >   2.. I have adjust it to .005-.010 inch when the idle speed is 750 rpm
> and transmission on D position but the anti stall unit is not activated in
> this situation should the unit be activated when the idle speed is 750.When
> I stop the engine it is the same gap .005-.010 is this ok. Is the vacuum to
> low?
> > 
> >     No, I don't believe it should be activated. You can tell if it is
> working by observing it with the transmission in neutral, parking brake set,
> and revving the engine. You should see the plunger extend and retract as the
> manifold vacuum changes.
> >   3.. Can I adjust the timing with a vacuum meter has any one tried this
> way ?
> > 
> >     I've never heard of it, and I don't see how the timing could be set
> anywhere near correctly with a vacuum meter. A timing light is best --
> although some can set it by "ear" -- listening to the engine as they adjust
> it.
> > 
> > Mike Reed in beautiful (toady, anyway) Lake Odessa, Michigan
> > 
> >  
> > 
> > [Non-text portions of this message have been removed]
> > 
> > 
> > 
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> >  
> > 
> > 
> 
> 
> 
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>  
> 
> 
> 
> 
> 
> 
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> 
>  
> 
> 
> 



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