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Re: Spark plug heat range??
[Re: hemi-itis]
#1669662
09/14/14 04:52 PM
09/14/14 04:52 PM
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Joined: Oct 2007
Posts: 4,206
New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,206
New York
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Actually, if the plug is too cold you have an easier time firing it, if by "firing" you mean "the current finds a path to ground".
Instead of jumping the electrode gap (creating a spark between the center post to the side electrode and then to the plug body), the electrical charge follows the conductive fouling material down the porcelain to the plug body and completes the circuit without making a spark.
Boffin Emeritus
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Re: Spark plug heat range??
[Re: hemi-itis]
#1669665
09/14/14 10:31 PM
09/14/14 10:31 PM
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Joined: Nov 2013
Posts: 97
Florida
johnmilner
member
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member
Joined: Nov 2013
Posts: 97
Florida
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Quote:
Mr P,would that also cause a misfire at higher RPM??
the middle plug looks good.
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Re: Spark plug heat range??
[Re: johnmilner]
#1669666
09/15/14 12:51 AM
09/15/14 12:51 AM
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Joined: Dec 2007
Posts: 12,587
Great Neck,LI,new york
hemi-itis
OP
I Live Here
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OP
I Live Here
Joined: Dec 2007
Posts: 12,587
Great Neck,LI,new york
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Quote:
Quote:
Mr P,would that also cause a misfire at higher RPM??
the middle plug looks good.
I forgot to say that static is 8:1 on gasoline 
Look at the strap on that plug,the line is just above threads,too much timing,but the inside of the plug looks good.I have to put a few passes on a set of 9's and see how they look.
HEMI-ITIS has no cure.
My condition is fully BLOWN!!
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Re: Spark plug heat range??
[Re: hemi-itis]
#1669668
09/15/14 01:37 AM
09/15/14 01:37 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
Quote:
Mr P,would that also cause a misfire at higher RPM??
the middle plug looks good.
I forgot to say that static is 8:1 on gasoline
Look at the strap on that plug,the line is just above threads,too much timing,but the inside of the plug looks good.I have to put a few passes on a set of 9's and see how they look.
I dont think thats true... since you have very little
time on them the color on the strap is up on the flat
but its hard to see being new plugs... your not fat
based on those pics but you say cruise is... I've
never played with that single bbl carb but if it
tunes like any carb then you need to lean down the
idle jets and fatten up the high speed to compensate
for the less idle
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Re: Spark plug heat range??
[Re: hemi-itis]
#1669670
09/15/14 02:21 AM
09/15/14 02:21 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Are the idle air bleed only for idle or do they effect the tip in also??
They change the amount of air being sucked in through
them... if they are small it pulls more fuel from
the jet... so it can change tip in.... do those have
all the same stuff as a regular carb like pump cams
and squirters... can be the squirters to small or when
they start... does it idle nice.. because a lean idle
can also cause that
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Re: Spark plug heat range??
[Re: hemi-itis]
#1669677
09/16/14 01:20 AM
09/16/14 01:20 AM
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Joined: Nov 2009
Posts: 2,177
ill
dennismopar73
top fuel
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top fuel
Joined: Nov 2009
Posts: 2,177
ill
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Quote:
Quote:
Quote:
Quote:
Also...try 7's
Think they would be too cold 
7`s are hotter than 8`s in NGK`s............didn`t notice if you had a wideband or not but tuning idle, cruise and wfo can be a bear w/out one............doable yes but a bear otherwise especially if you have an off idle stumble and don`t know if it`s rich or lean. 
 I went the wrong WAY  I put in 9's instead of 7's 
Lower the number hotter the plug guys
Opposite of champions n autolites
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Re: Spark plug heat range??
[Re: Cab_Burge]
#1669678
09/16/14 01:27 AM
09/16/14 01:27 AM
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Joined: Dec 2007
Posts: 12,587
Great Neck,LI,new york
hemi-itis
OP
I Live Here
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OP
I Live Here
Joined: Dec 2007
Posts: 12,587
Great Neck,LI,new york
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10 lbs with stockish iron heads and a siamesed iron block. It was breaking up over 6k RPM until I increased the timing to 35* and it woke right up.I had started taking timing out over 5500 RPM and it did not like that.Best pull was 9.907 @140 MPH with 35* and NGK 8's.Patrick advised me to go one step hotter and I went the wrong way  I'll test again with 7's and see what happens before any carb changes.
HEMI-ITIS has no cure.
My condition is fully BLOWN!!
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The last blown(14.71 with two blower 1150 Dominator carbs) iron block aluminum headed 426 Hemi I dyno tested liked 33 degrees total timing with 7.0 lbs of boost on CA pump gas, it didn't like 25 degrees to start with with 12 lbs of boost with C16 race gas 
