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r hammons · 04-21-2002, 10:54 PM

HAVING A PROBLEM OF GAS FOULING SPARK PLUGS, WORKING WITH A 60OVER 400 D PORT HEADS CAM IS 488 LIFT 320 DUR TORKER INTAKE 750DB HEI DIST WITH MSD 6AL AND BLASTER COIL AC45S PLUGS CARB HAS A 8.5 POWER VALVE AND HAVE JETTED IT DOWN TO 70/76 JETS.QUESTIONS HOW MUCH SMALLER IN JET SIZE CAN I GO, COULD THE HI DURATION OF THE CAM HAVE ANY EFFECT ON THIS PROBLEM, HOW ABOUT THE INTAKE OR A SPSCER PLATE WOULD THIS BE A PROBLEM, I HAVE CHANGED EVERYTHING ON THE INGTION FROM A STOCK HEI TO THE CURRENT, ON THE CARB I HAVE TRIED SEVERAL POWER VALVES, NO POWER VALVES JETS FROM 80 TO CURRENT COMBO,TTHE ONLY THING I HAVE NOT DONE IS CHANGE CAMS, DIFFERENT CARB OR DIFFERENT INTAKE, GOING BROKE BUYING SPARK PLUGS( APPOX 25 PASSES PER SET IF YOU CANT HELP SEND SPARK PLUGS

r hammons · 04-21-2002, 10:54 PM

HAVING A PROBLEM OF GAS FOULING SPARK PLUGS, WORKING WITH A 60OVER 400 D PORT HEADS CAM IS 488 LIFT 320 DUR TORKER INTAKE 750DB HEI DIST WITH MSD 6AL AND BLASTER COIL AC45S PLUGS CARB HAS A 8.5 POWER VALVE AND HAVE JETTED IT DOWN TO 70/76 JETS.QUESTIONS HOW MUCH SMALLER IN JET SIZE CAN I GO, COULD THE HI DURATION OF THE CAM HAVE ANY EFFECT ON THIS PROBLEM, HOW ABOUT THE INTAKE OR A SPSCER PLATE WOULD THIS BE A PROBLEM, I HAVE CHANGED EVERYTHING ON THE INGTION FROM A STOCK HEI TO THE CURRENT, ON THE CARB I HAVE TRIED SEVERAL POWER VALVES, NO POWER VALVES JETS FROM 80 TO CURRENT COMBO,TTHE ONLY THING I HAVE NOT DONE IS CHANGE CAMS, DIFFERENT CARB OR DIFFERENT INTAKE, GOING BROKE BUYING SPARK PLUGS( APPOX 25 PASSES PER SET IF YOU CANT HELP SEND SPARK PLUGS

WARPed · 04-21-2002, 11:10 PM

What are you using for a fuel system and what is the pressure set at? And of course your floats arent set too high right?

r hammons · 04-22-2002, 08:54 PM

i am running holley blue fuel pump and reg, bg in line fuel filter, 3/8 alumn fuel line with steel braid line at all flex points, press set at 6lb,floats setlower then normal (thickness of a dime below the site hole,gaskets are all new and in good shape,holley is fairly new

WARPed · 04-23-2002, 07:46 PM

Sounds like you have things sorted out up to now. You may have a problem in the needle and seat(s) or maybe using the wrong gasket behind the power valve. But before you put any more money into anything I would see if you could barrow a carb to rule out anything else in the fuel system. Also what vacuum are you pulling at idle, pick a value one size lower than you lowest number if you havent already done so.

r hammons · 04-23-2002, 08:40 PM

thanks for the reply,every thing you have mentioned i have done,and is correct, i am starting to lean toward the high duration of the cam and the single plane mainfold,could this be a problem with fuel mixture intake pulse ?

Tim Swain · 04-23-2002, 09:53 PM

Spacer plates can be a problem. I quite running my 1" plate with my torquer-2, but I was running lean. Sometmes you get turbulents with spacers. I kept changing pumps and presure gages, till I got it right. Most presure gages suck.
High duration and a single plane is not a problem.

[ April 23, 2002, 09:56 PM: Message edited by: Tim Swain ]

Half-Inch Stud · 04-24-2002, 11:43 AM

...would usually suggest "try a Q-Jet and see if the problem goes away" LOL, but not this time.

My only real suggestion:
Close down the throttle plates and try to get the idle from the idle circuits.

Then work the Accel pump cam with the Jetting to re-achieve super off-idle romps.

I assume that you are running strong, and hope the performance is not at the expense of running so rich that you're fouling up.

H.I. Stud

[ April 24, 2002, 11:48 AM: Message edited by: Half-Inch Stud ]

Half-Inch Stud · 04-24-2002, 11:46 AM

dolp

[ April 24, 2002, 11:48 AM: Message edited by: Half-Inch Stud ]

r hammons · 04-25-2002, 09:35 PM

thanks guys for the reply, i have worked with different spacers and no spaces, did not help, also checked the idle now the plate are almost closed , idle screws are out appox 1 turn, have drilled holes in throttle plate to help chive a good idle,as of the last set of plugs i had a fairly clean idle, good response, no smoke,ran strong,

Half-Inch Stud · 04-26-2002, 10:57 AM

Hmmmm, sounds like progress.

Let's open the can of worms: So, how;s the clenliness of the distributor advance weights?....and the slop in the return springs??...so, does the timing at idle come back to a predictable 12degrees or does it float around?

I'm gonna wonder what the idle vacuum is doing at this rate (now) because the Primary mixture should be all over the place, considering the fix was to shut-down the throttle plates. Good news is you are dialing the crab in nicely. So, study the timing behavior while running the Carb bellcrank to 300RPM and back to idle. Keep trying to lower the idle and observe your idle timing.

Sorry, but welcome to the next level.

H.I. Stud

r hammons · 04-26-2002, 09:22 PM

the vacumn reading at idle is 10.5 consistent, timing comes back to intial setting , i am running 18degree timimg initial with soft springs in the dist weiughts , could this be a problem, maybe stonnger springs less initial timing? might try that saturday, how about plug heat range? i keep moving to a hotter plug, now have a champion plug that is hotter than an ac45, could i be running to hot a plug that is breaking down fron a lean mixture , wqhen i pull then out and they are wet calling this a gas foul problem,what would colder plugs do?

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