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| Weber carb issue https://slantsix.org/forum/viewtopic.php?t=50952 |
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| Author: | Bing Kunzig [ Tue Jan 29, 2013 10:08 am ] |
| Post subject: | Weber carb issue |
Can anyone who has a DGEV on their slant tell me what size main jets and idle jets are in it. While my car runs and idles well, the spark plugs indicate too lean a mixture. The mixture screw is two turns out but making it any richer leads to a rougher idle. Thank you. |
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| Author: | SpaceFrank [ Tue Jan 29, 2013 2:05 pm ] |
| Post subject: | |
I have been going through this same Weber-tuning headache. I don't recall exactly what jets I'm running, but I'll check and see when I go out to work on the car tonight. Not sure how much help it'll be, though, since I'm not fully dialed in yet. I think I've been going back and forth between the 75 and 80 on my primary idle. Are you still running the mechanical fuel pump, or did you block it off and switch to electric? Also, which fuel pressure regulator are you using, if any? I've just about come to the conclusion that I'll never get my idle perfect on the stock mechanical pump. |
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| Author: | Bing Kunzig [ Tue Jan 29, 2013 4:01 pm ] |
| Post subject: | weber cab issue |
Actually it idles fine. I still have the stock fuel pump. I'm just concerned about running too lean. |
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| Author: | ceej [ Thu Jan 31, 2013 6:37 pm ] |
| Post subject: | |
What symptoms are you having that make you think it's running lean? Is the problem showing up at Cruise settings? Lean surge at normal cruise speeds will tell you to fatten up the jets. If the problem is manifesting itself in other modes of operation, it points to a different circuit. Keep in mind, with todays gasoline, reading plugs is different than the old days of White, tan and black. Reading plug color is no longer a reliable method. There are methods for reading plugs, but the porcelain color doesn't tell you much unless the engine is running horribly rich. White is the new tan. CJ |
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| Author: | Bing Kunzig [ Thu Jan 31, 2013 8:16 pm ] |
| Post subject: | weber carb issue |
Thank you for your reply. I am just going by the color of the plugs which are white which prompted my concern. The engine performs well and smoothly. |
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| Author: | ceej [ Thu Jan 31, 2013 10:27 pm ] |
| Post subject: | |
Look at discoloration of the threads. It should extend two or three threads. This is a general rule of thumb, and it takes a little experience before the practice will be second nature. The ground strap should have a slightly hot look down to about half way to where it attaches to the threaded barrel of the plug. If it looks like it's cooked all the way back to where it's joined to the plug, you may in fact be running lean. The big one is to examine the porcelain to see if you have metallic specs. It will look like aluminum specs; what the pistons are made of. That indicates detonation. If you see anything like that, be very concerned. What plugs are you using? What ignition, and what are you gapping the plugs to? How much compression are you running? CJ |
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| Author: | Bing Kunzig [ Fri Feb 01, 2013 10:44 am ] |
| Post subject: | weber cab issue |
There is no discoloration of the threads and there are no metallic specs on the porcelain, which I shouldn't describe as white but a lighter grey than I remember. Perhaps my concern is unfounded. It is a new '63 cylinder head and the plugs are autolite 66 put in by the mechanic. I believe I was using NGK before. If you have a plug recommendation let me know. The ignition is HEI. Compression is normal. Thanks again. |
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| Author: | ceej [ Fri Feb 01, 2013 5:16 pm ] |
| Post subject: | |
Sounds like a great setup! How is your fuel economy with the DGEV? I always liked that carb. Ran one on a spiced-up pushrod Subaru for a while. It returned phenomenal economy and performance in that application. CJ |
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| Author: | Bing Kunzig [ Fri Feb 01, 2013 7:41 pm ] |
| Post subject: | weber cab issue |
I recently took a trip covering about 500 miles and got 21 mpg. The best I have ever gotten was 23 but that may have been before ethanol. The finding myself thing is a hoot! |
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