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#21
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Sorry guys busy week.
Here is a better look at plug #1. This after 120 miles of driving this week. 50/50 highway/city. Didn’t have a chance to fill it up yesterday to check mileage but it seems up slightly.
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Sean 1967 GTO Koerner built 468 with Edelbrock RP’s 315cfm by Butler, Luanti Voodoo HR 20510713, 4l80e, Holley Terminator EFI |
#22
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Quote:
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Sean 1967 GTO Koerner built 468 with Edelbrock RP’s 315cfm by Butler, Luanti Voodoo HR 20510713, 4l80e, Holley Terminator EFI |
#23
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I usually recommend AEM widebands as they are not expensive and they get the job done.
https://www.amazon.com/AEM-30-0300-W...07150557&psc=1
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Carburetor building & modification services Servicing the Pontiac community over 20 years Last edited by shaker455; 12-08-2019 at 09:13 AM. |
#24
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For only 120 miles of run time plug is far too brown in color if it went into to the motor new, so indicating a very rich condition !
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#25
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i have an 850 on my street driven firebird with the 455...has 3.42 gears,,, 75 front jets with pv.. gets me around 12mpg. i would check the carb maybe your front metering rods are getting stuck
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1970 firebird, 468, e heads, |
#26
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This is the best way to operate your choke.. https://www.summitracing.com/parts/r...iABEgJ-P_D_BwE
Those electric chokes never worked right for me.. |
#27
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Ok so I bought an AEM A/F ratio gauge and installed it today. I pulled the carb apart and measured a few things after reading Cliffs Q-jet book. the front metering rods move freely. I have 74 jets in the primaries
Here are some numbers after driving the car with the new AFR gauge: Cruise ~ 13.2-13.5 Mild acceleration from a stop to 55mph ~ 13.8-13.3 WOT ~ in the high 12’s low 13’s Deceleration ~ in the 12’s a couple times in the high 11’s From my reading the deceleration should get leaner, not richer.... For those that are running an AFR gauge, how close to 14.7 are you getting? So what are your thoughts?
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Sean 1967 GTO Koerner built 468 with Edelbrock RP’s 315cfm by Butler, Luanti Voodoo HR 20510713, 4l80e, Holley Terminator EFI |
#28
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Spark curve?
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A man who falls for everything stands for nothing. |
#29
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Are you running any octane booster in your gas? If so, that will color the plugs a rusty brown color. Also, focus on the cruise and full throttle air fuel ratios. Deceleration numbers can be misleading. Based on your AF numbers I would lean up the primary side a little and put a little richer secondary metering rod in it.
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62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs |
#30
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What size are your primary metering rods?
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Carburetor building & modification services Servicing the Pontiac community over 20 years |
#31
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Primary metering rods measure .035”
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Sean 1967 GTO Koerner built 468 with Edelbrock RP’s 315cfm by Butler, Luanti Voodoo HR 20510713, 4l80e, Holley Terminator EFI |
#32
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I'm no expert but 35 sounds pretty rich for 74 jets doesn't it?
I'm thinking more like 44... Sent from my moto g(6) play using Tapatalk
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Greg Reid Palmetto, Georgia Last edited by Greg Reid; 12-15-2019 at 07:37 PM. |
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