RE: Fine tuning

[Earl Helm <earlh@xxxxxxxxxxxxxx>]

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Tom,

As you say, "to each his own". I perfer the power valves, especialy for a
street car. 
That is how Holley designed the carb to give you better overall performance.
With 
the new blow out protection, and people tuning correctely, you don't have
the old 
blow out issues you had in the past. It works both ways. Good advice....

Earl

on the opposite side of the coin is plugging the power valve and jetting
6-10 jets higher in the rear.
not sure where your settingas are, but this is how i tune all of my buddies
ebay specials (and sometimes
new) holleys and demons,

1) set all of the idle screws at 1 turn out, 2)set the butterflies to barely
open, but equal, 3)make sure the pumps have a gap when idling.
4) if it wants to die, open each butterfly a quarter  
   turn till it idles
5)fine tune the idle screws, mine are set at 3/4 turn out, and if i turn any
one of them a quarter turn in the engine will labor. the theory is to screw
them out until it starts to get rough then 1/4 turn back in, i dont do that
but many do.
 i can tell you both of my cars have double pumpers and will idle all day
long without choking you and have got no stumble issues, the satellite has a
rather big cam and is set almost the same as my small engine with small cam.

i also do not run power valves, to each his own.
i guage my jets by how they color my plugs, white plugs need bigger jets,
black plugs need smaller jets.

tom
65 satellite



--- ledman_70@xxxxxxxxxxx wrote:



> New Holley 780 cfm, but changing the power valve is an option I never 
> considered. Never changed the pump setting.
> Jeff
> Earl Helm wrote:
> > 
> > Is this thing a Holley? If so, put a power valve
> in it. That should
> > stop the rich at idle. Then see how much vacuum
> you have with
> > the Huges 509 cam, and then put the "Right" Power
> valve in it. That
> > should make your 1500 to 1800 stumble go away. If
> not, I would
> > suppect you have the Accelorator gap set
> incorectely.
> > 
> > Earl
> > 
> > 
> > This is VERY off the wall, so ignore if stupid in
> your
> > case...but,....are
> > your air filters of sufficient capacity to support
> the carb/engine
> > needs?
> > Mine were not...so I had a constant "over rich"
> > condition...adjusted to hell and back on the
> carbs...finally got some
> > help. 
> > Bob Fortson
> > 
> > --- ledman_70@xxxxxxxxxxx wrote:
> > 
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> > > 
> > > I have changed jetting, squirter, and pump cam.
> The car is running so
> > > rich at idle if you stand behind it, your eyes
> burn.
> > > I'm going to mess
> > > with the jetting some more next chance I get.
> The pump lever is at
> > > stock setting, just touching the adjusting nut
> at idle.
> > > Jeff
> > > tom hecht wrote:
> > > > 
> > > > maybe this was already mentioned, but how have
> you
> > > set
> > > > your accelorator pumps? the holley manual says
> to
> > > set
> > > > the gap with the throttle wide open.
> > > > to me this is a little to agressive, i back
> mine
> > > down
> > > > a little from that, but its worth a try
> > > > 
> > > > tom
> > > > 65 satellite
> > > > 
> > > > 
> > > > 
> > > > 
> > > > --- ledman_70@xxxxxxxxxxx wrote:
> > > > 
> > > > 
> > > > > Yes, it has vaccum advance, no, I haven't
> taken
> > > a
> > > > > reading yet. Wouldn't
> > > > > be the first stick I've chased, though.
> > > > > Jeff
> > > > > Jim Jablonski wrote:
> > > > > > 
> > > > > > Well Jeff, I am not trying to throw a
> stick
> > > into
> > > > > the woods to get you to
> > > > > > 
> > > > > > chase it, and there's smarter folks than
> me
> > > here,
> > > > > but here's what I was
> > > > > > thinking ... when accelerating at cruise
> load
> > > > > upward past 1500 RPM,
> > > > > > among other things, you are also relying
> on
> > > vacuum
> > > > > advance (if so
> > > > > > equipped).  At wide open throttle (where
> you
> > > say
> > > > > there is no issue) it's
> > > > > > 
> > > > > > pretty much up to the mechanical advance,
> > > given
> > > > > the absence of vacuum.
> > > > > > 
> > > > > > Did the Jeg's unit come with vacuum
> advance? 
> > > > > What's manifold vacuum
> > > > > > reading at 1500 RPM?
> > > > > > 
> > > > > > Just thoughts ...
> > > > > > 
> > > > > > Jim Jablonski
> > > > > > Royal Oak, Michigan
> > > > > > '64 Fury
> > > > > > 
> > > > > > ledman_70@xxxxxxxxxxx wrote:
> > > > > > > 
> > > > > > > No, it was a system made for Jegs, I
> don't
> > > > > remember the name. It came
> > > > > > > with distributor, harness, control box,
> and
> > > > > ballast resister for around
> > > > > > > $140. You think maybe something could be
> > > faulty
> > > > > in it?
> > > > > > > Jeff
> > > > > > > Jim Jablonski wrote:
> > > > > > > > 
> > > > > > > > Jeff,
> > > > > > > > 
> > > > > > > > IMHO, at that RPM, it sounds spark
> advance
> > > > > related.  What's the new
> > > > > > > > ignition system ... Mopar
> ECU/distributor?
> > > > > > > > 
> > > > > > > > Jim Jablonski
> > > > > > > > Royal Oak, Michigan
> > > > > > > > '64 Fury
> > > > > > > > 
> > > > > > > > ledman_70@xxxxxxxxxxx wrote:
> > > > > > > > > 
> > > > > > > > > I installed a new 780 Holley and
> > > complete
> > > > > new electronic ignition in my
> > > > > > > > > 413 in the last 2 months. I've
> rejetted
> > > the
> > > > > carb, changed the squirter,
> > > > > > > > > and adjusted the timing and carb
> till
> > > I'm
> > > > > blue in the face, but I can't
> > > > > > > > > get rid of the flat spot between
> > > 1500-1800
> > > > > rpm. When you let the clutch
> > > > > > > > > out and the engine starts to load,
> > > that's
> > > > > where the flat spot is most
> > > > > > > > > obvious. If you take off
> agressively,
> > > it's
> > > > > invisible. The engine has a
> > > > > > > > > 509 Huhges cam, headers, and a 2"
> carb
> > > > > spacer to adapt the Holley to the
> > > > > > > > > 
> > > > > > > > > 
> > > > > > > > > 
> > > > > > > > > 
> > > > > > > > > original cast intake. I can't
> determine
> 
=== message truncated ===



		
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