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#1 |
Registered User
Join Date: Jun 2014
Location: Paul idaho
Posts: 263
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Edelbrock carb accelerator tuning question
Okay, I know the comments are going to be get a Holley or Demon but I do not have the cash right now. My question is the accelerator pump is not fast enough. I have adjusted the linkage to the top hole and it made a big difference but not big enough. Is there anything else I can do to make the throttle response faster? The 650 cfm is on a performer series high rise intake atop a 350 with a half rad cam and 10-1 flat top pistons. Not a hot rod but it does need fuel, when I hit the throttle fast you can hear the large volume of air along with that hated stall before the fuel catches up. Any tips would be very helpful. Thanks
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63 C10 |
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#2 |
Senior Member
![]() Join Date: Jan 2011
Location: Hayes Va
Posts: 4,569
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Re: Edelbrock carb accelerator tuning question
Sounds like the air valve in the back may be a little off. Have you worked on adjusting it?
Jimmy
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60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic |
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#3 |
Registered User
Join Date: Jun 2014
Location: Paul idaho
Posts: 263
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Re: Edelbrock carb accelerator tuning question
Are you talking about the secondary air flap. If so I have not played with it. Can you give me some tips on this adjustment. From what I have read after you loosen it you adjust it to closed and then 1 and 1/2 turns is what the factory setup is. What would be your suggestion?
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63 C10 |
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#4 |
Registered User
Join Date: Mar 2014
Location: College Station, TX
Posts: 213
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Re: Edelbrock carb accelerator tuning question
You can get higher performance accel pumps for the carb.
http://www.summitracing.com/search?S...lerator%20pump
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63 SWB Stepside --Current Project http://67-72chevytrucks.com/vboard/s...d.php?t=836390 66 SWB Fleetside (Stacy) 350ci/Th400 --Gone http://67-72chevytrucks.com/vboard/s...45#post6595745 67 LWB Fleetside (Annabel)350ci/SM420. 7 Year Restoration --R.I.P. http://67-72chevytrucks.com/vboard/s...d.php?t=633867 |
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#5 |
Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,216
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Re: Edelbrock carb accelerator tuning question
You may need smaller metering rods or larger jets. Often These carbs have to be tailered to the engine. Look down the throat with the engine off & work the throttle. The accae. pump should put out 2 solid squerts. The pumps are usually leather. Sometimes you have to take it out & soak it in oil & massage it a little. They dry out. When you have the top off its a good time to check the float level If it is too low it will cause this problem.
The secondary air valves are not adjustable on this carb unless you have the AVS style. |
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#6 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,598
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Re: Edelbrock carb accelerator tuning question
The stall isn't caused by lack of fuel.
It's caused by lack of timing. What's your initial timing set at? |
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#7 |
Registered User
Join Date: Oct 2013
Location: Maine
Posts: 2,356
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Re: Edelbrock carb accelerator tuning question
You can download the owners manual for that carb online. It's pretty helpful.
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76 Chevy K20 76 GMC K15 77 Chevy C10 77 Chevy K10 |
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#8 |
Registered User
Join Date: Aug 2009
Location: S.C.
Posts: 1,593
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Re: Edelbrock carb accelerator tuning question
My first thought when I read it.
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'86 C-30 dually, 454/tbh400 '73 K-20 350/350/205 (sold ![]() I'm kinda like duct tape- no real purpose, but handy to have around. |
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#9 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,598
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Re: Edelbrock carb accelerator tuning question
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#10 |
Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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Re: Edelbrock carb accelerator tuning question
Amen brothers....I will 3rd that "timing 1st, then set the carb"....Longhorn
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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#11 |
Registered User
Join Date: Jun 2014
Location: Paul idaho
Posts: 263
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Re: Edelbrock carb accelerator tuning question
Well my timing is set at 10 so I think this should be good. I have played with the timing both directions and it just seems to get worse. I attempted to fix the timing first, I guess I should have mentioned that in the beginning. Thanks for the info though I always appreciate any help I can get.
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63 C10 |
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#12 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,598
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Re: Edelbrock carb accelerator tuning question
At your elevation you can run way more timing. Bump it up until it pings or is hard to start.
Also due to elevation you need to lower your float level a bit. Try an 1/8 to start. |
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#13 |
Registered User
Join Date: Jun 2014
Location: Paul idaho
Posts: 263
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Re: Edelbrock carb accelerator tuning question
Thanks I will give it a try
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63 C10 |
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carb issues, edelbrock, fuel problems |
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