ted, replied to the e-mail and the previous e-mails as well. I hope you're saving our interchange because certain somebody didn't set up any mailing list
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| how bout writing a carb tech artichle https://www.slantsix.org/forum/viewtopic.php?t=29185 |
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| Author: | rock [ Fri May 30, 2008 5:51 am ] |
| Post subject: | Juan, do you still want to do 4bbl stuff? Seems to be 1bbl |
Hello Juan! I have nice pics of my Holley work and would be glad to contribute re 4bbl milling and such. I am about to do some transfer slot work, but it seems you asked re. 4bbls in your post and the thread is now all about 1bbls. Are you doing a 1bbl article instead of a 4bbl? rock '64d100 |
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| Author: | ValiantOne [ Fri May 30, 2008 6:57 am ] |
| Post subject: | |
I'm going to follow this one closely. Not sure what I can do carb wise, but I can host pics on my web server if needed. Please let me know if I can help. Thank you, Chris E. |
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| Author: | Aggressive Ted [ Sun Jun 08, 2008 12:30 pm ] |
| Post subject: | Holley 1920 mods |
Juan, Wednesday was the only night it didn't rain and that is when I popped in the 61-2 jets and cleaned up the idle mixture screw. I think it is pretty close to being the correct mix. Mileage has stayed the same 22.5 mpg even though I have gone up 3.5 jet sizes, which includes allot of testing and stop and go traffic on the last tank. I pulled the mixture screw and it was black with old age and kind of rough textured so I took some 400 grit paper and shined it up and then took a scotch pad and worked on it some more. It is shinny smooth so I put it back in at 4 turns out instead of 6. It made a huge difference in idle quality. Got my 16" vacuum back for an in gear idle and 18" out of gear. I probably should clean up/enlarge the idle mixture hole a little and put a nice round dish inlet to the idle air bleed hole. Right now it is just flat with a the #65 drill hole, not as pretty as the high speed side with it's dished hole. I would think that would make it run a little better. I know these things are subtle changes but have a huge effect on idle quality and drivability. I am trying to find a small bearing and glue it on a punch so I can make the dished Face to the idle air bleed hole. Not sure what size bearing ball I need for that....bigger than a BB. I am not sure how far I should go with the jets. It would be fun to try a #62 since I have it, a #64 and a #66? I would think that a bigger jet at the drag strip might provide a better time slip. I will have to take some with me and give them a try. One thing that caught me off guard was when I had a rough idle from being too lean with the #58 jet, the exhaust smelled like I was running rich. After jetting richer and increasing the mixture flow it idles much smoother and doesn't smell rich any more. Kind of odd how that works....... If you get a chance to look at those pics I sent, the idle air bleed hole is not a pretty as the high speed bleed. |
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| Author: | Aggressive Ted [ Fri Jun 13, 2008 6:53 pm ] |
| Post subject: | |
Juan, How do you know when you have gone to big with the idle air bleed hole diameter? What are the symptoms? |
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| Author: | argentina-slantsixer [ Fri Jun 13, 2008 8:16 pm ] |
| Post subject: | |
ted, replied to the e-mail and the previous e-mails as well. I hope you're saving our interchange because certain somebody didn't set up any mailing list
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| Author: | argentina-slantsixer [ Fri Jun 13, 2008 8:17 pm ] |
| Post subject: | |
BTW this artichle would be for any kind of carburetor, once you master concepts as big as emulsion stages, air bleeds, etc, you can either tune a 3 barrel jap carb or american 2 barrels or any carb you might wanna tune up except for webbers, those are untuneable 
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| Author: | Aggressive Ted [ Fri Jun 13, 2008 8:20 pm ] |
| Post subject: | |
Juan, The Boeing server must be slow, got the other emails saved but none came in today. I am going to tear into it again tomorrow, so I was hoping for some more advice. Thanks, |
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| Author: | Aggressive Ted [ Sun Jun 15, 2008 10:09 pm ] |
| Post subject: | |
Juan, I complete overhauled the 1920 Holley Economaster this weekend. The idle mixture hole is reamed to .080, the idle air bleed is.035, the accelerator pump shot hole is .035, the idle mixture screw is at 3 turns and I increased the main jet to a #64. This is a far cry from the #57 jet I used to use with no idle air bleed. The engine feels like I have a hot two barrel 318 under the hood!   It idles with out missing a beat (smoooooth) and had gobs of low end torque. The vacuum gage has gone from 15" at 60 mph to 18" with lots of pedal (very responsive) before it drops to 15". This should keep me out of the power valve 90% of the time. I will drive it this way for a few weeks and post mileage. Prior to the changes I was running a #62 jet and the mileage was 23 to 23.5 driving back and forth to work, 130 mile round trip. |
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| Author: | argentina-slantsixer [ Mon Jun 16, 2008 3:03 pm ] |
| Post subject: | |
Ted I'm very happy! the key here is emulsion, when properly used, you can manage to have power, economy and good maneers. |
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