bog - Page 3

SS 230 · 07-31-2010, 06:51 PM

bill, did you fix your problem,if so what was it?

Monte Howard · 07-31-2010, 09:10 PM

Check your choke pull-off also.

Take the Vacum Line off the carb,push in the arm ,and put your finger over the vacum hose.

Then let your finger off the vacum line and make sure the arm comes out fairly smooth, or just put a new one on and make a run.

Grant Eldridge · 07-31-2010, 11:18 PM

Re/ the pull-off, on my car I found it important to bend the link so that, when the pull-off is fully pushed in, the air valve can only open a hair, maybe .010-.020". There is an enrichment circuit that is exposed to airflow as the front edge of the air valve begins to open which could cause excess richness if it is exposed at idle or when you're up on the converter. I cured a problem on my car by bending that link so that the air valve could not begin opening until the pull-off began to relax as vacuum dropped. My understanding is that this hole acts as a secondary accelerator circuit, drawing fuel into the secondary side to transition until the main circuit is providing sufficient fuel. One of the carb guys could explain this much better, but it is another Qjet thing to check.....

Mark Yacavone · 07-31-2010, 11:34 PM

Note : Bill said he's leaving off a two step so the carb butterflies would be WFO on the line.
The choke pull off (vacuum break ) doesn't have as much importance in that situation.
The secondary accelerator pumps are made to function as soon as the flapper starts to open. In this situation , it would already be open or pulsing it's way to open.

Bill Bogues · 07-31-2010, 11:39 PM

No, I haven't fixed it yet but it's not from lack of trying. I've changed or worked on everything that has anything to do with the car leaving the line and It still comes back to haunt me .I thought I had it fixed at the pro-am race in Baton rouge: Ran fri- sat- and sunday with no problems.Car had good 60' ft times (high 140's) and then at my last pass in elim's it bogs 300 rpm's, goes a 153, and I lost. I haven't ran it since but I'm reasonably sure it's fuel related. Thanks for reply on air valve ; I checked to see if it's working but I didn't check what you said you looked at. It's hard to get something lined out when you don't race a whole lot.

Bill Grubbs · 08-01-2010, 05:35 AM

Do not think this is crazy, however are you absolutely, 100% sure your foot is staying in the gas? We chased this problem for 2.5 years only to find that the two step made the carleave so hard (picked up .05 in the sixtey) that the seat gave enough for the accelerator to move. Just a thought.

07-31-2010, 06:51 PM	#21
SS 230 Junior Member Join Date: Dec 2008 Posts: 29 Likes: 0 Liked 1 Time in 1 Post	Re: bog bill, did you fix your problem,if so what was it?

07-31-2010, 09:10 PM	#22
Monte Howard Member Join Date: Nov 2002 Location: Potomac,IL Posts: 278 Likes: 1 Liked 65 Times in 22 Posts	Re: bog Check your choke pull-off also. Take the Vacum Line off the carb,push in the arm ,and put your finger over the vacum hose. Then let your finger off the vacum line and make sure the arm comes out fairly smooth, or just put a new one on and make a run. __________________ Monte Howard 3209 STK, 3208 SS

07-31-2010, 11:18 PM	#23
Grant Eldridge Member Join Date: Jul 2007 Posts: 124 Likes: 0 Liked 0 Times in 0 Posts	Re: bog Re/ the pull-off, on my car I found it important to bend the link so that, when the pull-off is fully pushed in, the air valve can only open a hair, maybe .010-.020". There is an enrichment circuit that is exposed to airflow as the front edge of the air valve begins to open which could cause excess richness if it is exposed at idle or when you're up on the converter. I cured a problem on my car by bending that link so that the air valve could not begin opening until the pull-off began to relax as vacuum dropped. My understanding is that this hole acts as a secondary accelerator circuit, drawing fuel into the secondary side to transition until the main circuit is providing sufficient fuel. One of the carb guys could explain this much better, but it is another Qjet thing to check.....

07-31-2010, 11:34 PM	#24
Mark Yacavone Veteran Member Join Date: Mar 2002 Location: Miles From Nowhere Posts: 7,793 Likes: 2,884 Liked 5,086 Times in 1,938 Posts	Re: bog Note : Bill said he's leaving off a two step so the carb butterflies would be WFO on the line. The choke pull off (vacuum break ) doesn't have as much importance in that situation. The secondary accelerator pumps are made to function as soon as the flapper starts to open. In this situation , it would already be open or pulsing it's way to open. __________________ "We are lucky we don't get as much Government as we pay for." Will Rogers

07-31-2010, 11:39 PM	#25
Bill Bogues Member Join Date: Apr 2005 Location: Bethany La. Posts: 322 Likes: 96 Liked 169 Times in 53 Posts	Re: bog No, I haven't fixed it yet but it's not from lack of trying. I've changed or worked on everything that has anything to do with the car leaving the line and It still comes back to haunt me .I thought I had it fixed at the pro-am race in Baton rouge: Ran fri- sat- and sunday with no problems.Car had good 60' ft times (high 140's) and then at my last pass in elim's it bogs 300 rpm's, goes a 153, and I lost. I haven't ran it since but I'm reasonably sure it's fuel related. Thanks for reply on air valve ; I checked to see if it's working but I didn't check what you said you looked at. It's hard to get something lined out when you don't race a whole lot. __________________ Bill Bogues 4696 STK

08-01-2010, 05:35 AM	#26
Bill Grubbs Member Join Date: Oct 2002 Location: Magnolia, Texas Posts: 416 Likes: 3 Liked 564 Times in 66 Posts	Re: bog Do not think this is crazy, however are you absolutely, 100% sure your foot is staying in the gas? We chased this problem for 2.5 years only to find that the two step made the carleave so hard (picked up .05 in the sixtey) that the seat gave enough for the accelerator to move. Just a thought.