Re: Edelbrock accelerator pump adjustment question
[Re: David_Trimble]
#1300637
10/12/12 08:27 PM
10/12/12 08:27 PM
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Joined: Jan 2003
Posts: 738 OK
David_Trimble
OP
super stock
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OP
super stock
Joined: Jan 2003
Posts: 738
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Well, I dremeled down the eroded area with a wire wheel brush and it looks better (i guess short of replacing the carb it's going to be the best it'll ever get ). So I started reassembling the carb, but in checking over the JB on the venturis I noticed that it's still slightly tacky. I would've thought it'd cure by now- or is that normal for JB? If worse comes to worse I could soak a venturi overnight in gasoline and see what happens....
'69 Dodge Charger R/T
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Re: Edelbrock accelerator pump adjustment question
[Re: David_Trimble]
#1300638
10/12/12 09:00 PM
10/12/12 09:00 PM
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Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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yea dont sweat it,I have run much worse looking carbs than that one. the JB weld can take more time to cure depending on mixture and weather. JBquik is the fast set one that needs to be worked asap before it set up in 5-8 mins. I prefer this kind but both will work once cured. I have put q-jets back together with it still a little soft but never had any trouble later.
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Re: Edelbrock accelerator pump adjustment question
[Re: RapidRobert]
#1300642
10/13/12 08:45 PM
10/13/12 08:45 PM
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Joined: Jan 2003
Posts: 738 OK
David_Trimble
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super stock
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OP
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I let the venturis go in the toaster oven for about 3 hours. During that time the 'tackyness' gradually went away. Took them out and gave them time to cool- now the JB is just as hard as the metal.
Everything had been cleaned up so all there was left to do was reassemble the carb. Once I did that though I followed the instructions on how to adjust everything back to specs and there's something that doesn't seem right. On the step where you calibrate when the secondaries open up (and this was waaaaayyy off on my carb), when all was said and done I found that my secondaries will open when the primaries are about 3/4 open. If I recall correctly I think this is right for most 4bbl carbs - but when I manually open the primaries all the way I notice the secondaries only open about 3/4 of the way - maybe a little more. Is this correct? It seems to me that the secondaries should be almost as open as the primaries?
'69 Dodge Charger R/T
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Re: Edelbrock accelerator pump adjustment question
[Re: David_Trimble]
#1300644
10/14/12 03:31 PM
10/14/12 03:31 PM
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Joined: Jan 2003
Posts: 738 OK
David_Trimble
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super stock
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OP
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Well I figured my above question can wait, so I went ahead and reinstalled the carb, started the car, warmed it up and adjusted the initial timing to 20deg. But at 750rpm I was still pulling almost 15"Hg from the ported vacuum. If I dropped the RPMs to 500 then the reading on the ported vacuum would drop to almost 0, but as soon as I started increasing the RPMs, so did the vacuum... I could increase my initial advance past 20, but I'm not sure if it'll do me any good at this point. ON the good side, the stumbling/stuttering on acceleration is now completely gone.
'69 Dodge Charger R/T
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Re: Edelbrock accelerator pump adjustment question
[Re: David_Trimble]
#1300645
10/14/12 04:09 PM
10/14/12 04:09 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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Success! I'd think you'd want the secondary blades vertical at WOT for max flow. At 15 deg initial sure doesn't sound like retarded timing is opening the blades to far past a "square". With adequate initial (like we have here) I've never seen that problem. I'm wondering if it's blade/slot wrong phasing if the transition slot was machined wrong but that seems like a stretch & I'm a firm believer in K.I.S.S. but also the secondary link is bent wrong for it not to be wide open so... Wish I had my eddy that I just let go so I could check it out. If you need a 750 rpm idle & will have vacuum you may likely have to tune it starting with using manifold instead of ported vacuum to set your initial then cap it to set the total (slots) then mix/match springs staying just under pinging at WOT
live every 24 hour block of time like it's your last day on earth
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Re: Edelbrock accelerator pump adjustment question
[Re: David_Trimble]
#1300647
10/14/12 06:56 PM
10/14/12 06:56 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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You would take off the heavy link that connects the primary and secondary shafts on the passenger side. Yes you'd set initial on the manifold vacuum (drivers) side with the can operational then shorten the slots to get 35 (SB) with the vac can temporarily capped off then mix/match springs staying just under the pinging point @ WOT then plug the can back in & check for pinging in everyday varied driving conditions & if needed turning the allen wrench CCW will give less advance at a given in hg along the cans' slope
live every 24 hour block of time like it's your last day on earth
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Re: Edelbrock accelerator pump adjustment question
[Re: David_Trimble]
#1300650
10/14/12 10:25 PM
10/14/12 10:25 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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that's why I didn't post immediately on your Q about the secondaries not being vertical as I am not 100% sure & was hoping someone with more knowledge would chime in but I would THINK that they should be wide open at WOT so there's no restriction then the weighted valve regulates the air. Set the initial (on manifold) then set the slots to 35 (vac capped) then mix/match springs FOR WOT then rehookup the vac adv & check it at a steady state high vacuum on the highway at an RPM above where the slots are maxed out AND just under the pinging point in everyday driving under varied vac conditions. I should check the 1406 on my 318 DD & look down & see if the secondaries are wide open at WOT and raise the idle to 750 & see if there's still no vacuum on the pass ported nipple
live every 24 hour block of time like it's your last day on earth
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Re: Edelbrock accelerator pump adjustment question
[Re: David_Trimble]
#1300652
10/14/12 11:33 PM
10/14/12 11:33 PM
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Joined: Jan 2003
Posts: 9,436 Blair County,PA
62maxwgn
master
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master
Joined: Jan 2003
Posts: 9,436
Blair County,PA
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David,if you read the instructions,same as AVS ,both primaries and secondaries should reach full open at the same time,that link is the only adjustment,there is no other adjustment,nothing else is reevant.
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Re: Edelbrock accelerator pump adjustment question
[Re: David_Trimble]
#1300654
10/16/12 08:04 PM
10/16/12 08:04 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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I checked my 1406 as installed on a bone stock '83 318 (exc for carb/streetmaster intake/dist tweaking) and my normal idle is ~600 and when I turned the idle speed screw in 1 exact turn (starting from just closed) the idle speed went up to 720 and no vacuum out of the pass (ported) port. then I cranked it up higher and ported did not start to show vacuum untill ~900 ish rpm and at 2 full turns in I was up to 1300 rpm and showing 1&1/2" vacuum. I run 18 deg of initial at ~600 rpm EDIT Oh I checked the throttle and the link did not start to open the secondaries until I was pretty close to WOT and it only opened them a very little bit . At that point it did take very little finger pressure to open them up all the way so I guess airflow opens the secondaries the rest of the way & also opens the counterweighted air valve above it
Last edited by RapidRobert; 10/16/12 09:13 PM.
live every 24 hour block of time like it's your last day on earth
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Re: Edelbrock accelerator pump adjustment question
[Re: David_Trimble]
#1300656
10/19/12 01:02 AM
10/19/12 01:02 AM
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Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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I can do that for you. I have a BB with a 600 carb dialed in for a 650 idle. I set my timeing and carb with the vac gauge along with the light for checking what it likes. it is dialed in on mine,idle at 650 and stomp it to floor and it goes right to WOT. no bog. just I do the q-jet on the SB the same way,timeing light with vac gauge,dials it right in..i did have to tighten the back airdoor on the q-jet to fix the bog while tuning. it idles 650 and goes right to WOT makes the q-jet sound and drinks gas. with my old vac gauge i dont focus on the numbers so much. just watch it to see it reach its peak vac point and see how much I move it down from there and back up to peak. the old trick is to get the highest vac reading and back down 1 full Hg and try it to see if it likes that. just keep repeting and reseting curb idle,air mixture screws,timeing till you find what it likes. find the base and make notes from there..keep track of timing settings as you tune. I have mine set for good daily driving on the SB, but add some 91 gas.bump 4 more degrees of timeing and it picks up power without pinging. it will ping on the 87 gas, so i back it down 4 degrees to my base line setting. IMHO,what it likes will not be the specs in the FSM book.
Last edited by scratchnfotraction; 10/19/12 01:17 AM.
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