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| 1920 Holley Carb Rebuild https://slantsix.org/forum/viewtopic.php?t=23831 |
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| Author: | MoparBrit [ Sat Jun 30, 2007 4:43 am ] |
| Post subject: | 1920 Holley Carb Rebuild |
Just bought a '71 Dart /6. Running really rich when I got it so got a kit and rebuilt the carb. According the the instruction sheet schematic I'm missing a couple of parts. I want to see if that is actually the case or if they illustrate something that some carbs had, but not all. First piece is a spring behind the valve. I'll see if I can explain where this is. Take off the fuel bowl, remove the float with the spring under it and remove the main valving type body (don't have the instructions in front of me to see what it is offically called) by removing the screws holding it in the fuel bowl. Behind that is the valve/diaphram. My picture shows there should be a spring horizontally behind the valve/diaphram and pressing against the metal block just removed. I have no spring there. Second piece is on the other side of the valve/diaphram bit. The arm off of that sticks through a hole in the carb and attaches to the pivot arm on the side of the carb. That arm that sticks through the body of the car is show in the picture to have some sort of sleeve that goes on it I would assume to semi seal up the hole around it as is passes through the carb body. I have nothing here so the arm off the diaphram sticks through the carb body and it is just open otherwise around it. I've got the carb back together and it is not as rich as it was for sure, but still gives me a bit of smoke from being too rich. Sorry, don't remember what jet was in it, but may go this route after verifying the pieces are needed or not and trying to get the carb adjusted correctly. Thanks for any help. If I do need these pieces does anyone have any spares??? Cheers |
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| Author: | SlantSixDan [ Sat Jun 30, 2007 7:16 am ] |
| Post subject: | |
The first spring you're missing is the accelerator pump drive spring. It fits into a cylindrical well cast into the carb's main body, and is what actually drives the accelerator pump diaphragm to force a shot of fuel into the carb throat when you step on the gas. It needs to be there. The sleeve you're seeing was used only on '62-'63 Holley 1920s with a different style of accelerator pump. The valve thing is called the "metering block". The rich running could be due to a heavy (fuel-soaked) float, or a metering jet too large, or a power valve that's come apart and is open all the time, or a metering block that is crudded up and worn out beyond redemption. Does it run rich all the time, or just sometimes? You may be able to get this carb working right, but you may not. Avoid parts store "remanufactured" units. I've still got some brand-new ones; send me a PM if you'd like one. Beyond that, other things to reduce overly-rich running include making sure the carb is sitting atop the correct 3/8"-thick base gasket and doing the fuel line mod. Also check your choke for proper operation; I seem to see a lot of the '70-'72 chokes bent up and not working right. I like to use the electric choke kits. And of course...get the books described in this thread. |
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| Author: | MoparBrit [ Sun Jul 01, 2007 6:54 am ] |
| Post subject: | |
Sent a PM. Hope it went through right. |
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| Author: | MoparBrit [ Mon Jul 02, 2007 6:06 am ] |
| Post subject: | |
Hi, Guess the PM did not work to you. Wasn't sure that I did it right on this board or not. That was my concern. The spring looks like it has two retainer pegs there, but no spring in this carb. Do you or anyone else have one of these? Found a carb at the local scrap yard, but no spring was in that one either. Just rebuilt the carb totally with a kit. Float fine, all clearances to spec, block clean correct base gasket (old gasket was collapsed so that it filled in the carb base channels, don't think that could be good!) etc. When I got the car the carb was extremely rich. Sitting at idle a rev would produce a good amount of smoke out the back. Did a complete engine tune up and tried adjusting the carb first, but did not make a difference so picked up a kit. According to some of the listings I saw, the carb on the car is a replacement. Not saying it was new mind you, the previous owner was fond of the scrap yard and may have got it there. Carb number is 6260 2 and the car is a '71 Swinger. Picked up the kit from NAPA for the carb number. Annoyingly I've lost or thrown away the bit of paper where I noted the jet number that was in the carb while doing the rebuild. Checked choke operation and it opens all the way correctly. With the choke all the way open, engine warm obviously, I still get a bit of petrol smoke out the back, but no where near what it was. Could be that missing spring giving me jib, but I want to verify all the settings again just to double check. Dan, you mention having new carbs. Could you give details, price etc.? I'd like to do the Super Six two barrel conversion as I've read that it gives a bit more power, but more importantly to me, the best fuel economy I can get. Being able to collect ALL the pieces needed (instead of piece meal together out of perhaps non compatible parts) and funds preclude that now so just trying to optimize what is stock right now. As yet, the car has not been out on the road with us as since I've got it I've been redoing the mechanical to ensure safety and reliability, but hope to have it on the road again in the next couple of weeks. Doing a suspension and brake rebuild now. Anyway, long winded, but any help you or anyone else can be would be most appreciated. Cheers |
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| Author: | SlantSixDan [ Mon Jul 02, 2007 6:29 am ] |
| Post subject: | |
Got your PM, just late in responding! Sorry 'bout that, you've got a PM now. |
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