black sparkplug#2cylinder
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black sparkplug#2cylinder

  1. #1
    Senior Member hotbo's Avatar
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    Default black sparkplug#2cylinder

    heres what ive got been trying to figure out and just know got started,its my ole mans mill i built last winter.ever since we fired it up the first time it has had a pop sound in the exhaust nothing big but you can hear it if you listen.
    motor specs as follows.
    496 eagle forged kit..070 over srp pistons.
    10.2 close to zero deck compression.
    comp solid roller cam.252-260-661 668 cant remember advertised duration have it at the shop not here at home.
    108 centerline installed.108 lobe sep.
    comp solid roller lifters hi-tech pushrods.
    heads are pro-comp aluminum.{i know}2.25 valves-1.90
    comp springs.
    proform roller rockers,1.7 ratio
    pro hurricane intake single plane tall
    1050 holley dominator tuned by biggs perfromance up north.
    stud girdles,ect.
    igniton is msd pro-billet dist, 6al box with accel super coil.taylor plug wires

    heres what i have done so far,many variables,it will turn the #2 plug black as coal 1 trip out.all the others are little fat gonna fix that too, but nothing like this one.
    okay done leakdown test today.the best cylinder was 6 percent the worst 9 percent the #2 was 8 percent leakdown,good imo.
    so i ruled out maybe valve or rings,this motor may have 20 hours on it tops,dad run it this way last summer put new plug in it everytrip out,guess he thought it would quit,lol!!!!anyway to find out why.
    i looked at my intake ports matching the manifold ports damn near perfect.
    i have been told maybe comp ground the cam bad,so im trying to check this out with dial indicator mounted to head and checking off of the retainer on the spring only got 2 intakes done before i left.

    the #2 intake valve came to .6.58
    the #4 intake {which is burning good was 6.62.
    the intake valve lift on card says 661 lift on the intake side.

    if this checks out okay on the exhuast,where to start next.
    fuel,electrical.new cap rotor wires where put on after the problem started no luck there.maybe got bad ones???
    im stumped never had this before maybe someone can help,me with this.

    the only cylinder bad is the #2 the rest are good looking plugs other than being just a tad to rich,thanks travis

    oh yeah it turns a a/b cut stainless agressor impeller,that was detailed by scott seastrum.6200-6300.
    so wtf seems to have good power maybe more if he can get all 8 cylinders to work properly,lmfao

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  3. #2
    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Black and bone dry, sooty?

    Black and wet? Oily?

    If oily I'd be thinking a valve stem seal.

    Dry and heavy soot should be rich, but how on a single 4-barrel setup way out on the corner.
    #4 look just fine, or maybe a bit too rich too compared to 6&8?

  4. #3
    Senior Member hotbo's Avatar
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    Quote Originally Posted by SmokinLowriderSS View Post
    Black and bone dry, sooty?

    Black and wet? Oily?

    If oily I'd be thinking a valve stem seal.

    Dry and heavy soot should be rich, but how on a single 4-barrel setup way out on the corner.
    #4 look just fine, or maybe a bit too rich too compared to 6&8?
    no oil ,black and major sootyeah single dominator.got me all screwed up????

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    Senior Member Gravyboat's Avatar
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    I think you'll discover whatever the problem is it's going to be on the exhaust side. Whether it's unrelated or not, I wouldn't dismiss the popping sound.
    Recheck the simple stuff like lash, check consistency against other valve train parts...rocker ratio, push rod length. Then move onto the other things like proper lifter function, misground cam lobe, valve stem length.

    Doesn't sound like a fuel problem or even a valve seal or ring problem. But.....
    Does it smoke blue upon initial startup (usually indicates a bad valve seal) or smoke blue consistently (usually a ring problem)?
    Test that cylinders' rings by taking a psi reading, then pull the plug, squirt some oil in the cylinder, roll the motor over a few times and take another reading. If the psi increases, then you have a ring problem.

    There are people here that know far more more than I do. Just trying to throw some possibilities out there.

    Good luck
    Edit: It just dawned on me....might be a ignition related thing like insufficient spark getting to THAT one cylinder. Might explain the buildup on the plug. That "popping" might actually be a misfire.
    Last edited by Gravyboat; 02-25-2008 at 08:23 PM.

  7. #5
    No Sandbar To Far sanger rat's Avatar
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    Oil ring upside down.
    Quote Originally Posted by One More Year View Post
    The only blab's I will even be a part of is just when it is me they are talking about. Aaaah yes I can see a few good looking shiny tall deck motors on the beach, with barely enough fuel to get back to the launch saying, "Holy crap how fast you think that Daytona was going man? That's like the 20th time he's gone by today?"

  8. #6
    Senior Member bordsmnj's Avatar
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    could it be a bad spring on the intake valve? curious to see what the right answer is know. i wish the mill a speedy recovery. please post end result. -jas
    Quote Originally Posted by Rep. Joe Wilson (R) View Post
    YOU LIE!!!!!


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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    I missed the "exhaust pop" first go-arround. May or may not be related BUT, yes, would not dismiss it.

    A rocker bind perhaps or a touch too tight an exhaust valve/guide?

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    Senior Member hotbo's Avatar
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    Quote Originally Posted by Gravyboat View Post
    I think you'll discover whatever the problem is it's going to be on the exhaust side. Whether it's unrelated or not, I wouldn't dismiss the popping sound.
    Recheck the simple stuff like lash, check consistency against other valve train parts...rocker ratio, push rod length. Then move onto the other things like proper lifter function, misground cam lobe, valve stem length.

    Doesn't sound like a fuel problem or even a valve seal or ring problem. But.....
    Does it smoke blue upon initial startup (usually indicates a bad valve seal) or smoke blue consistently (usually a ring problem)?
    Test that cylinders' rings by taking a psi reading, then pull the plug, squirt some oil in the cylinder, roll the motor over a few times and take another reading. If the psi increases, then you have a ring problem.

    There are people here that know far more more than I do. Just trying to throw some possibilities out there.

    Good luck
    Edit: It just dawned on me....might be a ignition related thing like insufficient spark getting to THAT one cylinder. Might explain the buildup on the plug. That "popping" might actually be a misfire.
    already did a leakdown test showed good.
    has never ever puffed a lick of smoke and uses no oil what so ever
    yeah guys its got me stumped gonna check the exhaust side today.
    oil ring upside down what would that do???no oil is getting to the plug and the leakdown shows good???
    if the exhaust shows good im leaning toward igniton for some reason is not getting to the plug correctly?????

  11. #9
    mo balls than $cents$ IMPATIENT 1's Avatar
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    did you look down the intake runners and see if they matched up with the heads, you know i ran into that myself. if the ports aren't lining up side to side, it'll puddle fuel at the blockage i had to move a few intake ports over by almost 1/4in.

  12. #10
    Senior Member hotbo's Avatar
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    Quote Originally Posted by IMPATIENT 1 View Post
    did you look down the intake runners and see if they matched up with the heads, you know i ran into that myself. if the ports aren't lining up side to side, it'll puddle fuel at the blockage i had to move a few intake ports over by almost 1/4in.
    hey tom looked them over real wellalmost perfect i done good on that part,lol!!!
    okay cam lift checks fine.
    heres my next move,check spring pressure on that cylinder compare to others,then if thats good,new wires plugs re-jet carb run it see what happens then.if that helps,or if not start stagger jetting leaning out the front cylinders.if that doesnt work ill kill somebody,i dont think to much is wrong here it runs real strong.if all this helps im gonna chalk it up to chinese heads and intake combowe should have knew better

  13. #11
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by hotbo View Post
    hey tom looked them over real wellalmost perfect i done good on that part,lol!!!
    okay cam lift checks fine.
    heres my next move,check spring pressure on that cylinder compare to others,then if thats good,new wires plugs re-jet carb run it see what happens then.if that helps,or if not start stagger jetting leaning out the front cylinders.if that doesnt work ill kill somebody,i dont think to much is wrong here it runs real strong.if all this helps im gonna chalk it up to chinese heads and intake combowe should have knew better
    yeah, i learned my lesson

    if you just port matched to a gasket, you're runnin into the same thing i found, port matching doesn't match the intake to the heads, just the gasket
    pull the carb off and look down the intake, borrow a boreoscope if ya have too, but i bet there's a lip blocking the #2 runner some, mine did.took me 2 days to port the intake perfectly, but it should work great now put the super sucker spacer on there to make sure mixture was distributing evenly as could be.

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    Senior Member hotbo's Avatar
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    Quote Originally Posted by IMPATIENT 1 View Post
    yeah, i learned my lesson

    if you just port matched to a gasket, you're runnin into the same thing i found, port matching doesn't match the intake to the heads, just the gasket
    pull the carb off and look down the intake, borrow a boreoscope if ya have too, but i bet there's a lip blocking the #2 runner some, mine did.took me 2 days to port the intake perfectly, but it should work great now put the super sucker spacer on there to make sure mixture was distributing evenly as could be.
    hey fool i said i did that no lip.thank you next idea okie,lol!!!!!!!!!!!!!!!!!

  15. #13
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by hotbo View Post
    hey fool i said i did that no lip.thank you next idea okie,lol!!!!!!!!!!!!!!!!!
    what did ya say okie?

    so its popping thru the exhuast? what rpm range, does it do it when snapping the throttle?

  16. #14
    I'm famous ! Lucky's Avatar
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    I almost say say plugs and wires . check the simple stuff first . Ohm test the wires , Buy or move your plugs around see if its the plug - maybe just a really cold burn and and its not firing off well on that cylinder do to conditons ? just a guess but i find alot of problems are usualy simple ! sometimes we jump over dollars to save dimes .
    " my carbon footprint is gonna kick your green ass"


    Quote Originally Posted by 396_Ways_To_Spit View Post
    WOWO!!!!! THat has to be the most beautiful crank that Ive ever seen!!!!!!!!!!!!!!!!


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