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My Tires HATE Me...

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My Tires HATE Me...

  #21  
Old 10-16-2009, 03:27 PM
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Originally Posted by Horseapples View Post
Junior, you need a bigger shooter in the carb. The bog is from a lean condition when the butterflys open and not enough fuel is mixed with the hi volume of air. The number of the discharge nozzle is stamped on the front. Stock size is probubly a .25 (measured in thousandths). I would suggest a .31 to .35

http://www.summitracing.com/search/?...harge%20&dds=1
i was going to ask what type of secondaries he is running...im assuming vacuum? is that a double pump carb? i agree that its more likely a tuning issue than something that requires taking the carb off and dealing with downtime.

jr, i daily drove the mirada for 3 years, until i went to college...i feel your pain.
 
  #22  
Old 10-16-2009, 03:32 PM
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Originally Posted by Horseapples View Post
Junior, you need a bigger shooter in the carb. The bog is from a lean condition when the butterflys open and not enough fuel is mixed with the hi volume of air. The number of the discharge nozzle is stamped on the front. Stock size is probubly a .25 (measured in thousandths). I would suggest a .31 to .35

http://www.summitracing.com/search/?...harge%20&dds=1
See, I had figured it was a lean condition considering if I half choke it, the hesitation disappears. However, it was something that developed later. Right out of the box the carb performed beautifully, only adjustment I had to make was the idle.
 
  #23  
Old 10-16-2009, 04:29 PM
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the lean condition could be brought on by many things, such as a different cam, vaccuun leak, timing change or addition of power brakes or other vaccuum operated accessorie. Swapping a discharge nozzle is pretty cheap and quite easy to do. they are right inside the primary air horn, held in with a large phillips head machine screw. DO NOT operate the throttle with the discharge nozzle(S) removed or it will spit out the check valve, then you are screwed! If it is a double pumper, change both nozzles, probubly 28 or30's would do nicely, if vaccuum secondary, all you have is the primary nozzle, and i would go with the 31 to 35 range.
 
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Old 10-16-2009, 04:39 PM
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what about slow secondaries?
 
  #25  
Old 10-16-2009, 04:47 PM
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A secondary spring that is too light, or too fast, could cause a bog, but too slow would just make it slugish. Junior needs a trick kit to tune it correctly. The trick kit comes with discharge nozzles and secondary springs. As well as accellerator pump cams, hi-flow needle and seats and gaskets. but they are a little pricey.

http://www.summitracing.com/parts/HLY-37-933/
 
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Old 10-16-2009, 04:54 PM
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Originally Posted by Horseapples View Post
A secondary spring that is too light, or too fast, could cause a bog, but too slow would just make it slugish. Junior needs a trick kit to tune it correctly. The trick kit comes with discharge nozzles and secondary springs. As well as accellerator pump cams, hi-flow needle and seats and gaskets. but they are a little pricey.

http://www.summitracing.com/parts/HLY-37-933/
discharge nozzles...my dad always calls them "carb pissers"...

do those kits come with jets?
 
  #27  
Old 10-16-2009, 05:26 PM
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No, but they come with everythingelseto super tune a Holley. here is a jet kit.

http://www.summitracing.com/parts/AED-6000/
 
  #28  
Old 10-16-2009, 05:37 PM
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thats the one that i have...except weve had it for a decade, and its packed full of jets...
 
  #29  
Old 10-16-2009, 11:46 PM
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I'll probably end up buying a trick kit this spring when pull the engine back out. I've just been living with the hesitation, once the motor catches you can't tell anything is wrong. The secondaries are opening beautifully, btw.
 

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