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: > > > > > Your free subscription is supported by today's > > > sponsor: > > > > > > ------------------------------------------------------------------- > > > So Much Television, Such Little Time! In Love > with > > > Lost(TM) or > > > Devoted to Desperate Housewives(TM)? Take our > premier week survey, > > > complete our offers, and get a FREE* DVD set of > either show! > > > > caad3QabQmH9Ma/Viewer > > > Survey > > > > > > ------------------------------------------------------------------- > > > > > > 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 === __________________________________ Yahoo! Mail - PC Magazine Editors' Choice 2005 http://mail.yahoo.com