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05-28-2012, 11:40 AM
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CC Member
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Join Date: Sep 2008
Cobra Make, Engine: B&B
Posts: 30
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Not Ranked
Distributor set up
Using a Mallory uni distributor with a vacuum advance. can someone help with the setup. Car runs fine if I push the rpm's up slowly. If I stand on it I get backing through the exhaust. till i back off. thanks!!
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05-28-2012, 12:13 PM
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CC Member
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Join Date: Jan 2008
Location: Williamsport,
PA
Cobra Make, Engine: Kellison Stallion 468 FE
Posts: 2,703
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wow.....ok....plugs,wires,carb,ignition box,rev limiter hit. the neighbors kid stuck in the sidepipe.......you'll have to give us more info there........
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Fred B
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05-28-2012, 02:23 PM
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CC Member
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Join Date: Sep 2008
Cobra Make, Engine: B&B
Posts: 30
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Plugs new, wires new, carb new, rev limit set at 5200, if the neighbors kid is stuck I'll kick his ass out for gettin the car dirty. We've narrowed it down to vacuum. floats set ,jets are 80's(holley), timing and valves all set to factory spec. can't get rid of the popping in the exhaust when you stand on it. Mallory site says to backoff the allen set screw in the vacuum advance to two turns and adjust from there. Thats where I'm lookin for guidance. Thanks!
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05-28-2012, 02:28 PM
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CC Member
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Join Date: May 2008
Location: Brisbane,
QLD
Cobra Make, Engine:
Posts: 2,797
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Disconnect the vacuum advance, plot the existing timing versus rpm with a timing light, advance the timing 2 degrees at a time to see how the engine reacts.
Report back with your advance curve from the above and supply the engine specs.
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Gary
Gold Certified Holden Technician
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05-28-2012, 02:37 PM
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CC Member
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Join Date: Jan 2008
Location: Williamsport,
PA
Cobra Make, Engine: Kellison Stallion 468 FE
Posts: 2,703
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Quote:
Originally Posted by jlb169
Plugs new, wires new, carb new, rev limit set at 5200, if the neighbors kid is stuck I'll kick his ass out for gettin the car dirty. We've narrowed it down to vacuum. floats set ,jets are 80's(holley), timing and valves all set to factory spec. can't get rid of the popping in the exhaust when you stand on it. Mallory site says to backoff the allen set screw in the vacuum advance to two turns and adjust from there. Thats where I'm lookin for guidance. Thanks!
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i agree, disconnect advance first and see.......have you hung a vacuum gauge on it?.......do you just have a vacuum leak?
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Fred B
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05-28-2012, 02:49 PM
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CC Member
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Join Date: Sep 2008
Cobra Make, Engine: B&B
Posts: 30
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doesn't change with or without a vacuum line. thats why i'm thinking I'm not getting any advance from the distributor
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05-29-2012, 08:06 AM
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CC Member
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Join Date: Nov 2007
Cobra Make, Engine: Contemporary-427 stroker
Posts: 349
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,jets are 80's(holley),
80's are....alot of jet....
I run 74 in the front and 82 in the back.
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05-29-2012, 08:39 AM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,452
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Exhaust popping is often caused by a lean mixture. Which Holley do you have? How are the secondaries set up?
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.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
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05-29-2012, 12:41 PM
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CC Member
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Join Date: May 2008
Location: Brisbane,
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Quote:
Originally Posted by jlb169
doesn't change with or without a vacuum line. thats why i'm thinking I'm not getting any advance from the distributor
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What doesn't change, the timing or the backfiring?
Have you plotted the timing curve with a timing light?
What Holley are you running, CFM, list number etc?
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Gary
Gold Certified Holden Technician
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05-30-2012, 06:20 AM
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Senior Club Cobra Member
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Join Date: May 2007
Location: Mesa,
AZ
Cobra Make, Engine: Contemporary Classic, 428 FE CCX 3069
Posts: 7,506
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Back to "have you hung a gage on it?". Do you know that you are getting enough vacuum out of the engine? Sometimes, with certain cams, you only draw a few pounds of vacuum and need to think about mechanical advance distributors.
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Dan in Arizona
CCX3209
"It's a great car and I love it, but it doesn't do 'SLOW' very well."
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05-30-2012, 11:27 AM
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CC Member
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Join Date: Apr 2009
Location: Little Rock area,
AR
Cobra Make, Engine: ERA Street Roadster #782 with 459 cu in FE KC engine, toploader, 3.31
Posts: 4,527
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Sounds like a fuel problem or ignition breakdown issue - but not vacuum advance. Too much vacuum advance while cruising along (light throttle) can cause a miss-like sensation but vacuum advance falls out immediately as soon as you punch it.
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