[DeTomaso] listserver down?

[Dave Londry]

Last one I saw was mine yesterday evening (PDT)

On 28/08/2012 5:59 PM, David D Fisher wrote:
> This is the only (forum) email that has made it through to me since yeterday afternoon which would seem statistically highly improbable given how much we like to chatter.
>   
>   I notice nothing is hitting my spam filter so I am wondering if others are having receiving problems.
>   
> I realize this is a bit of a stupid question given that I may not see the responses and you may not see this email, but what the heck..
>   
> David
>   
>   
>
> ________________________________
>   From: Mikael <mikael_hass at mail.tele.dk>
> To: dennis617 at aol.com; detomaso at realbig.com
> Sent: Tuesday, August 28, 2012 1:03 PM
> Subject: Re: [DeTomaso] Vacuum Advance - ported or full vacuum source
>    
> Dennis, some facts first:
> 1. Choosing between the two does in no way affect your total timing. That is
> of course only true if you set your initial idle the right way, with vacuum
> line disconnected and plugged
> 2. The vacuum off idle and cruising and WOT etc, they're the same regardless
> of whether you use manifold or ported vacuum. I've seen a test of this with
> a Throttle Position Sensor and two Manifold Air Pressure sensors (one
> connected to the manifold, the other to ported vacuum), and the two values
> were the same at all rpm, except at idle.
>
> This means that the only thing you have to consider when choosing between
> the two, is what happens below 1000 rpm. Normally an engine idles better
> with more vacuum. So normally one would use manifold vacuum. That's what
> they did in the 60s when idle quality was more important than
> anti-pollution. In the 70s they started to use ported vacuum even though it
> made the idle worse (they had to put on solenoids to boost idle when the A/C
> kicked in), to lower emissions. So always start with manifold vacuum, try
> that out first. What would make you go to ported instead then? One of two
> things. If either the engine pings at idle (never experienced that) or if
> the engine is hard to start because the early ignition makes the cylinder
> ignite when the piston is still on the way up. In those cases you have to
> reduce ignition advance at idle. This can be done by going to ported vacuum,
> but then you lose all vacuum advance. Another middle way is to keep the
> manifold vacuum, but adjust the vacuum advance, most modern distributors
> have adjustable vacuum advance using an allen wrench. Beware you can't
> adjust the rate/speed of advance per vacuum unit, only the maximum advance.
>
> So, there's a bit of trial and error to do here. Go full vacuum advance, and
> if no pinging or start problems, keep it.
>
> BTW, all this and more is described in my book Tuning Made Easy (gotta make
> a living)
>
> Mikael
>
> -----Oprindelig meddelelse-----
> Fra: dennis617 at aol.com [mailto:dennis617 at aol.com]
> Sendt: 27. august 2012 16:41
> Til: detomaso at list.realbig.com
> Emne: [DeTomaso] Vacuum Advance - ported or full vacuum source
>
>
> Does anyone have an opinion on which source I should use for my vacuum
> advance on my Mallory Unilite distributor, full vacuum directly from the
> intake manifold or ported vacuum from the Holley 650 double pumper?  I have
> a mostly stock engine with an Edlebrock Performer intake manifold.  I have
> recieved conflicting information from Holley and Mallory, Holley claims that
> I should use the ported vacuum at the carb and Mallory said I should use
> full vacuum from the intake manifold.
>
>
> _______________________________________________
>
> Detomaso Forum Managed by POCA
>
> Archive Search Engine Now Available at http://www.realbig.com/detomaso/
>
> DeTomaso mailing list
> DeTomaso at list.realbig.com
> http://list.realbig.com/mailman/listinfo/detomaso
> _______________________________________________
>
> Detomaso Forum Managed by POCA
>
> Archive Search Engine Now Available at http://www.realbig.com/detomaso/
>
> DeTomaso mailing list
> DeTomaso at list.realbig.com
> http://list.realbig.com/mailman/listinfo/detomaso
>
>