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Re: hesitation when cold, 318 + 1406
[Re: hooziewhatsit]
#493060
10/15/09 08:38 PM
10/15/09 08:38 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Is the plunger material leather or neoprene? You can run a small screwdriver around the bottom ID to expand the leather ones. When I did some AFB's for a customer he brought in a smaller neoprene plunger cup so there are at least 2 sizes available. this smaller one would go a good ways into the AP bore(which are tapered) before it would grip the sides & build pressure.
live every 24 hour block of time like it's your last day on earth
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Re: hesitation when cold, 318 + 1406
[Re: RapidRobert]
#493061
10/15/09 08:51 PM
10/15/09 08:51 PM
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Joined: Oct 2007
Posts: 3,903
Oregon
hooziewhatsit
OP
master
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OP
master
Joined: Oct 2007
Posts: 3,903
Oregon
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These are the blue neoprene ones. (http://www.summitracing.com/parts/EDL-1470/) They both start hitting the bore about where the vertical slot is to allow gas in. I just don't have access to another carb to know if I'm moving the throttle too slow and/or expecting too much. I just know it's a pain to drive right now 
If you ever find yourself in a fair fight, your tactics suck.
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Re: hesitation when cold, 318 + 1406
[Re: RapidRobert]
#493062
10/15/09 09:00 PM
10/15/09 09:00 PM
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Joined: Aug 2006
Posts: 1,609
Southern Cal
Noblewk
top fuel
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top fuel
Joined: Aug 2006
Posts: 1,609
Southern Cal
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It been a while, but isn't there supposed to be a check ball in the bottem of the AP? If that is missing it could be pumping the fuel back into the fuel res.
66 Dart GT, 402 11.18:109 Best
63 1/2 Galaxie 500XL 406 4Speed 13.20:103 Best
2000 Ram
2005 Durango Hemi.
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Re: hesitation when cold, 318 + 1406
[Re: hooziewhatsit]
#493063
10/16/09 06:51 AM
10/16/09 06:51 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
Got a new AP plunger today. Seemed to sit a little higher in the bore than the old one. Otherwise, haven't noticed a difference 
I get a few bubbles from around the plunger when I push it in by hand while it's towards the top of the bore. Farther in it's fine. Thinking about it now, I didn't check to see if the bore is still true or not 
I can still move the throttle slowly and not get anything out. I checked, and it appears to have the .024" squirters in it.
Even when warmed up (180*F) and cruising at 35mph, if I gently add some throttle it coughs and sputters.
The 1/2" spacer hasn't seemed to help at all with warm restarts, so I think I'll just take it off.
what are your cam specs, idle vaccuum in park and gear, and what step up springs are you using?
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: hesitation when cold, 318 + 1406
[Re: patrick]
#493064
10/17/09 02:04 PM
10/17/09 02:04 PM
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Joined: Oct 2007
Posts: 3,903
Oregon
hooziewhatsit
OP
master
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OP
master
Joined: Oct 2007
Posts: 3,903
Oregon
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Quote:
what are your cam specs, idle vaccuum in park and gear, and what step up springs are you using?
Cam is the Voodoo 60400, 208/213@50
http://www.summitracing.com/parts/LUN-60400/
Idle vacuum is 18" at 1100rpm. In gear it goes down to 16" and 7-800rpm. The step up springs are the middle ones (Orange, 5"). I also checked, and the timing does not change when it goes into gear.
This summer I had it idling at 7-800 normally, then 600ish in gear. Now with it colder it doesn't like idling that low.
This summer I also still had the issue where after a drive it will idle a couple hundred rpms higher than 'idle' (instead of 800 it'll be 1000).
Maybe I just need to send the carb to demonsizzler  
If you ever find yourself in a fair fight, your tactics suck.
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Re: hesitation when cold, 318 + 1406
[Re: hooziewhatsit]
#493067
10/20/09 08:27 AM
10/20/09 08:27 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
Quote:
what are your cam specs, idle vaccuum in park and gear, and what step up springs are you using?
Cam is the Voodoo 60400, 208/213@50
http://www.summitracing.com/parts/LUN-60400/
Idle vacuum is 18" at 1100rpm. In gear it goes down to 16" and 7-800rpm. The step up springs are the middle ones (Orange, 5"). I also checked, and the timing does not change when it goes into gear.
This summer I had it idling at 7-800 normally, then 600ish in gear. Now with it colder it doesn't like idling that low.
This summer I also still had the issue where after a drive it will idle a couple hundred rpms higher than 'idle' (instead of 800 it'll be 1000).
Maybe I just need to send the carb to demonsizzler
switch to the pink (7") or natural (8") step up springs.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: hesitation when cold, 318 + 1406
[Re: patrick]
#493068
10/20/09 08:48 AM
10/20/09 08:48 AM
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Joined: Jan 2003
Posts: 5,791
Hamilton, Ontario Canada
Magnum
master
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master
Joined: Jan 2003
Posts: 5,791
Hamilton, Ontario Canada
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I have similar issues with my truck. It's a Magnum engine with an M1 aluminum dual plane intake. Since it was originally a fuel injected engine, no heat crossover in the heads.
Excellent fire up. Dead cold with no choke less than half throttle of pump shot and hold the pedal down about an 1/8. It will fire up and idle.
Then it's boggy for about 6-8 minutes. Which is longer than my temp gauge needs to climb. I'm pretty confident it's waiting for the radiator to start blowing warm air on the engine. Then it's bog free.
My reason for believing the problem is a cold intake manifold is I've installed a 120v engine heater. It's a style that flows water through the intake down through the block and out the drain plug at the bottom.
I can heat the intake, warm in less than 10 minutes, block still cold. 30 to warm the entire engine. As long as I warm the intake. It will drive bog free on a freezing cold day.
So on an engine that's normally boggy until it's completely warmed up. I can warm my intake on a super cold morning and the engine will run "as if it's warm".
69 Super Bee, 93 Mustang LX, 04 Allure Super
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Re: hesitation when cold, 318 + 1406
[Re: Magnum]
#493069
10/20/09 11:48 AM
10/20/09 11:48 AM
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Joined: Oct 2007
Posts: 3,903
Oregon
hooziewhatsit
OP
master
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OP
master
Joined: Oct 2007
Posts: 3,903
Oregon
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I took the carb apart again a couple days ago. The bore for the AP wasn't pitted, but it did have a crusty white crud built up in places (  ). So I broke out the dremel and got it polished up nicely. Afterwards it was a bit better, but still not that easy to drive. So, I went ahead and richened it up quite a bit. MUCH better. Now I still have a very slight bog, even with the biggest pump shot (smallest squirters though). and I just found a running '90 360 with harness and computer for $400. 408 in the future?  I'll still give the stiffer step up springs a try and/or take out the 1/2" spacer.
If you ever find yourself in a fair fight, your tactics suck.
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and yes going to a 408 will fix most (if not all) of your SB problems 