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Author
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Topic: hesitation /cough
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2bdrivn
Journeyman Posts: 11
From: Slidell, LA, USA
Registered: Jan 2002
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posted 12-19-2003 10:58 PM
   
i have a mildly built 351 cleveland and since rebuilding it i have a bad hesitation and backfire /cough out of the carb when the throttle is tapped too fast. this occurs wheter in nuetral or in gear. I have replaced carbs (now have a holley 600 cfm vac sec) i am on mysecond distributor which is a stock single point vac advance. I wonder if this could be ignition related and if either the timing chain set may be loose or the cam has end play causing irratic timing? I noticed once when timing that the timing fluctuated widely when tapping the gas even slowly. initial timing is at 14 deg
'71 stang conv. 2.71 gears, auto, 351 cleveland 14.89 1/4 mile
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Moneymaker
Administrator Posts: 20735
From: Lyons, IL, USA
Registered: May 99
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posted 12-19-2003 11:00 PM
600 Holley has a #25 primary discharge nozzle.
It is WAY too small for a 351C.
Get a #31 or even #33 nozzle and your hesitation should go away.  ------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,&'03
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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2bdrivn
Journeyman Posts: 11
From: Slidell, LA, USA
Registered: Jan 2002
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posted 12-19-2003 11:21 PM
i have a #31 squirter now. what next?
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Moneymaker
Administrator Posts: 20735
From: Lyons, IL, USA
Registered: May 99
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posted 12-20-2003 11:13 AM
#35------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,&'03
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
IP: Logged |
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