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| BBD carb knowledge needed https://slantsix.org/forum/viewtopic.php?t=67294 |
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| Author: | tattoosteve99 [ Mon Jun 12, 2023 3:48 pm ] |
| Post subject: | BBD carb knowledge needed |
So after doing some work on the ignition it’s time to sort some carb issues. I come here to ask you peeps as all I’ve ever got here is straight to point and spot on info. Yes, Dan, that includes you! Anywho. So noticing some things that I’m not sure about so I’ll explain the best I can. I noticed a lot of play in the accel pump, s link, and pump arm. I’m not sure this is even an issue. I have rebuilt several carbs and have access to some good tech to boot. So, what I notice is that when the pump arm moves, attached to the s link, it takes quite a bit of motion for the accel pump to move. Is that normal? Or is there a way to adjust that “play” out of it? I did read this https://www.carburetor-blog.com/knowledge-base/bbd-pg2/ but there is no mention about the issue I see, if it is even an issue. Edit, 1978 dodge d100 with factory 2 bbl bbd |
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| Author: | ProCycle [ Mon Jun 12, 2023 4:38 pm ] |
| Post subject: | Re: BBD carb knowledge needed |
I know very little about BBDs but I have some considerable experience with 'flatslide pumper' motorcycle carburetors. In the bike application you don't want the accelerator pump to start squirting until the throttle is around 1/4 open. When you start getting a squirt as soon as soon as the throttle is cracked open you get too much fuel right off idle and the engine will bog. |
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| Author: | matv91 [ Mon Jun 12, 2023 7:23 pm ] |
| Post subject: | Re: BBD carb knowledge needed |
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| Author: | matv91 [ Mon Jun 12, 2023 7:32 pm ] |
| Post subject: | Re: BBD carb knowledge needed |
white adjustment slot.green s bend bottom is smooth top has retainment shape. Sound like acc pump cup sticking is bore.Accelerator shaft should move instanely no slack no delays. |
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| Author: | matv91 [ Mon Jun 12, 2023 7:43 pm ] |
| Post subject: | Re: BBD carb knowledge needed |
Does your bbd have bowl vent,they can hang up there if adjusted wrong |
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| Author: | ProCycle [ Mon Jun 12, 2023 7:44 pm ] |
| Post subject: | Re: BBD carb knowledge needed |
@matv91 is the man when it comes to Slant 6 carburetors. Listen to him instead of my unrelated comments. |
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| Author: | tattoosteve99 [ Mon Jun 12, 2023 9:10 pm ] |
| Post subject: | Re: BBD carb knowledge needed |
Quote: white adjustment slot.green s bend bottom is smooth top has retainment shape. Sound like acc pump cup sticking is bore.Accelerator shaft should move instanely no slack no delays.
If I understand you correctly. When the white moves the green moves at the same time, no slack? Mine has slack and quite a bit. I’ll try to get pics of it tomorrow. Also, can I adjust the slack out of it with the adjusting slots?
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| Author: | matv91 [ Tue Jun 13, 2023 7:53 am ] |
| Post subject: | Re: BBD carb knowledge needed |
When the white moves the green moves at the same time? Yes If the pump plunger is free to move spring force will take up slack. Slot is for height adjustment. |
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| Author: | matv91 [ Tue Jun 13, 2023 10:23 am ] |
| Post subject: | Re: BBD carb knowledge needed |
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| Author: | matv91 [ Tue Jun 13, 2023 10:37 am ] |
| Post subject: | Re: BBD carb knowledge needed |
with bowl vent yellow vent tube Green vent control valve in correct position on top, if slips under can hang up pump shaft white top pump shaft measurement point |
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| Author: | matv91 [ Tue Jun 13, 2023 11:55 am ] |
| Post subject: | Re: BBD carb knowledge needed |
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| Author: | matv91 [ Tue Jun 13, 2023 12:00 pm ] |
| Post subject: | Re: BBD carb knowledge needed |
Green dot control valve stuck under under plastic lifting arm, that will cause trouble maybe broken lifter arm. Black points to s link in correct postion, not up side down |
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| Author: | matv91 [ Tue Jun 13, 2023 4:40 pm ] |
| Post subject: | Re: BBD carb knowledge needed |
https://www.carburetor-blog.com/knowled ... justments/ half way down page under Adjustments – Solid Fuel Design |
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| Author: | tattoosteve99 [ Tue Jun 13, 2023 5:00 pm ] |
| Post subject: | Re: BBD carb knowledge needed |
https://youtube.com/shorts/Kct6RW1qiiA?feature=share This is a private link. I know this is an open forum though. |
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| Author: | matv91 [ Tue Jun 13, 2023 5:57 pm ] |
| Post subject: | Re: BBD carb knowledge needed |
Cannot see vedio real good, checked 3 carbs none had slack.Lifter arm is plastic might be cracked or worn Adjust and try again. May be screw is loose |
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