Edl. 650, is my jetting too rich?
#168094
12/15/08 05:05 PM
12/15/08 05:05 PM
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Joined: Oct 2007
Posts: 3,884 Oregon
hooziewhatsit
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OP
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'72 pickup, 318 & 727, recently rebuilt top end. Mild Voodoo cam, 4bbl intake & an edelbrock 650 (1405) I rebuilt a couple months ago. Adjustable fuel pressure regulator, currently set to 5.5psi. Electric choke is firmly closed when cold. I live at 4000' elevation. When I rebuilt it I corrected the float heights to what they're supposed to be. Both idle jets are 2 1/4 turns out. Now that it's cold here (high of 25*F for the next week), it's been rather hard to start. I also can't think about putting it in gear until it's completely warmed up. If I do put it in gear it dies immediately . When it does finally start, it's very rough until it warms up. When it doesn't start, it does act to me like it's flooding. Currently, my jetting is set to #9, with a .101" jet instead of the .100" (I didn't have a .100"). Secondaries are .095". A friend recommended I go a bit richer than base to account for the 10% ethanol in our gas. After doing the math for elevation ( ), it looks like I should actually be 5% lean, and closer to #22 or #24, rather than a step rich. I was talking to a guy at the parts store who said he didn't change anything to account for ethanol. page 12 here has the calibration chart. http://www.edelbrock.com/automotive_new/mc/carbs_acc/pdf/carb_owners_manual.pdfAm I on the right track? Thanks, -Dave
If you ever find yourself in a fair fight, your tactics suck.
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Re: Edl. 650, is my jetting too rich?
[Re: ph23vo]
#168099
12/16/08 04:34 PM
12/16/08 04:34 PM
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Joined: Oct 2007
Posts: 3,884 Oregon
hooziewhatsit
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Attached is a picture of one of my plugs. Kinda hard to see, but the base-ring has an even layer of black soot. Doesn't that indicate rich? Inside the base-ring the porcelain is a nice light brown color. The plugs are Champion RN14YCs.
To check the rods, do I just pull off the cover plate for each one while it's running?
Yesterday when I took it to town it acted like it ran out of gas a few times and died. Would sputter a few times, then die. After cranking for 5-10 seconds it would fire back up and be fine for a half mile. Weird.
Thanks, -Dave
If you ever find yourself in a fair fight, your tactics suck.
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Re: Edl. 650, is my jetting too rich?
[Re: hooziewhatsit]
#168100
12/16/08 08:15 PM
12/16/08 08:15 PM
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Joined: Apr 2007
Posts: 2,327 Glendale, AZ
69L78Nova
Banned. Forever.
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Banned. Forever.
Joined: Apr 2007
Posts: 2,327
Glendale, AZ
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The Edelbrock "1405" is a 600cfm, not 650
1969 Nova 454/M21/3.31 Mild mid-11 second weekend cruiser
1994 F150 XLT Super Cab 2WD 5.0/4R70W/3.55 (Daily driver)
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Re: Edl. 650, is my jetting too rich?
[Re: 69L78Nova]
#168101
01/06/09 07:57 PM
01/06/09 07:57 PM
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Joined: Oct 2007
Posts: 3,884 Oregon
hooziewhatsit
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Updates: So, a few weeks ago I jetted it down to #24 and took it for a drive. Made it about a mile, and it decided it would idle, but not move without dieing Called the wife, and had her bring some more fuel line so I could take the Fuel pressure regulator out. After that, it ran just fine for 10 miles. So, I got home, disconnected the fuel line, and checked the fuel pressure while it idled with the fuel left in the bowls. I was only getting 2.5-3PSI with a brand new pump (!?!?). Doesn't that seem low? Only thing I can figure is my pump is putting out very little volume, and the added restriction of the FPR was causing it to starve the carb for fuel? I checked the plugs today. Coloring looked alright on the porcelain. The color on the ground strap was all the way to the base ring. Doesn't that mean I could go one step colder? So, Fuel pump having issues with too low of pressure? Could go one step colder on my plugs? Thanks for any thoughts, -Dave
If you ever find yourself in a fair fight, your tactics suck.
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