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surge at 50-60mph #1091420 10/09/11 09:28 PM 10/09/11 09:28 PM
Joined: Aug 2011 Posts: 32 Stouffville Ontario 7 7434 mopars OP member
7434 mopars OP member 7 Joined: Aug 2011 Posts: 32 Stouffville Ontario	my 70 challenger 440-6 when warm , has developed a serge when crusing at highway speeds, any suggestions would be appreciated

Re: surge at 50-60mph [Re: 7434 mopars] #1091421 10/09/11 09:34 PM 10/09/11 09:34 PM
Joined: Oct 2005 Posts: 797 arizona, usa L lokalik super stock
lokalik super stock L Joined: Oct 2005 Posts: 797 arizona, usa	lean or too much advance(timming)

Re: surge at 50-60mph [Re: 7434 mopars] #1091422 10/09/11 09:41 PM 10/09/11 09:41 PM
Joined: Nov 2003 Posts: 5,048 Atlanta Indiana D Dave Watt master
Dave Watt master D Joined: Nov 2003 Posts: 5,048 Atlanta Indiana	Probably a lean condition. What is your primary jet size? Or your advance timing at that particular RPM.

Re: surge at 50-60mph [Re: Dave Watt] #1091423 10/09/11 09:46 PM 10/09/11 09:46 PM
Joined: Jun 2003 Posts: 9,225 Charleston S sixpackgut Drag Week Mod Champion
sixpackgut Drag Week Mod Champion S Joined: Jun 2003 Posts: 9,225 Charleston	surging is a lean condition but may i also suggest that gas seems to be getting crappier and crappier and vapor lock may be the culprit Gen 3 power 6.22@110, 9.85@135 Follow @g3hemiswap on instagram performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs

Re: surge at 50-60mph [Re: sixpackgut] #1091424 10/09/11 11:02 PM 10/09/11 11:02 PM
Joined: Jul 2008 Posts: 30,441 Florida STAYcation dOc ! The village idiot's idiot
dOc ! The village idiot's idiot Joined: Jul 2008 Posts: 30,441 Florida STAYcation	Try ONE jet-size larger on the center-carb.

Re: surge at 50-60mph [Re: Dave Watt] #1091425 10/09/11 11:12 PM 10/09/11 11:12 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	Quote: What is your primary jet size? run it up to the offending rpm in your driveway & note (& post) the timing & I'm assuming this is high vacuum cruising so vac adv is all in just like when your cruising & unless total is way skewed I'd go up several sizes on pri jets. EDIT Much lesser chance but fyi if the others are good check rotor phasing; disconnect/plug vac adv (which alters phasing) and crank up the initial so the total timing is the same as it was at offending cruising rpm & see if it misses more/less or the same & if it changes holler and right now I would pump up the vac can with a Mityvac to max like it is when cruising w eng off & turn the eng slightly with the fan belt or loosen dist housing & turn it till the magnet is lined up with a tooth & see if the pickup gap is right Last edited by RapidRobert; 10/10/11 09:08 AM. live every 24 hour block of time like it's your last day on earth

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