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Author
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Topic: Jetting/plug read mystery
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V8 Thumper
Gearhead Posts: 4681
From: Phoenix, Arizona
Registered: Dec 2001
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posted 09-09-2002 07:12 PM
   
I tuned the stumble out of my carb  , going back to my baseline jetting  and down-sizing the squirter. No stumble at all now  THESE ARE NOT FULL-POWER PULLS, but I got a much 'happier' plug read from leaner jets  , a nice choclate brown color on the porcelin, with the base ring & threads still being pretty dark. BIG-TIME stumble with this jetting. Richening it up took all the stumble out of it, but now the porcelin is bone white  WTF? Too hot a spark plug heat range? The color on the ground strap was 1/2 way up with the leaner jetting, only about 1/3 the way up with the richer jets. Maybe because I drove it harder, but the motor seemed to run a bit warmer with the richer jetting as well. These plug reads seem bass-akwards, lean = cool, rich = hot, or am I AFU?
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Moneymaker
Administrator Posts: 27499
From: Lyons, IL, USA
Registered: May 99
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posted 09-09-2002 07:18 PM
Not enough fuel delivery with the fat jets would be my guess.  (needs more fuel volume, pressure) ------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator NHRA/IHRA/SRA/MCA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
Professional Manwhore
The Barry of BarrysGrrl Quote: "I never met a magazine mechanic I liked."
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V8 Thumper
Gearhead Posts: 4681
From: Phoenix, Arizona
Registered: Dec 2001
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posted 09-09-2002 07:21 PM
Wow, I didn't even think of that  I've got a 3/8 line from the bottom of the tank all the way to the carb, Holley mechanical pump rated at 110 gph @ 6-8 psi, do you think it needs more than that?
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Moneymaker
Administrator Posts: 27499
From: Lyons, IL, USA
Registered: May 99
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posted 09-09-2002 07:36 PM
Do you have a guage and an adjustable regulator? Does it actually indicate 6-8 lbs of pressure or is that the rating? If not then you really don't know how much fuel pressure you have do you Todd?  Kinda need to know that stuff with a high dollar high HP piece like you have now buddy. ------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator NHRA/IHRA/SRA/MCA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
Professional Manwhore
The Barry of BarrysGrrl Quote: "I never met a magazine mechanic I liked."
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V8 Thumper
Gearhead Posts: 4681
From: Phoenix, Arizona
Registered: Dec 2001
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posted 09-09-2002 07:39 PM
ahem, you've got mail
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