|
Nice. You need to drill the holders to get the in between size. I had to.
|
Got in 2 test drives this afternoon with the 120 holders, 1st drive with idle mix set to 12.5-13 A/F, lean idle. "Punching" it moderately showed mixture going lean with the stumble, and much backfire when backing off the gas. 2nd drive with mix set rich 10-11 A/F, but smoother, Punching it showed mixture also going lean (15-16) but no backfire when off the gas. At this point I would surmise it needs a larger pump shot ? Carbs had blocked pump valves when I got them , but were replaced with .50's. I think I'll try advancing the initial timing first. Zrayr: just read the info you showed, very interesting.
I'll report results as soon as I have some! |
13: 100 holder is that "point" 1, or 1/10th mm? I'll see if I can get close to that with my # drills.
|
Quote:
My 10 & 14 degree bushings are on the way. We'll see if I have any benefit. Right now the car seems to like 22 initial timing best as far as idle quality goes. A lot of my off idle stumble went away with going to the lightest dist. springs, but sometimes the idle will hunt a bit with them. It just starts advancing too soon, so I'm trying the next lightest combo. Quote:
Ha ha, he's said much the same thing to me. He's right about one thing, you can get the best performance out of a set of Webers when they "appear" by the numbers to be running a bit rich (especially on the low end). Just my experience so far. Z. |
Quote:
The numbering is in 1 hundredths of a millimetre. 100 hundredths of a 1 millimetre = 1mm. An industry standard for any metric jetted carburettor. |
Motorhead
try 75 idle with 120 air Im betting on 80 idle with 130 to 135 air Mixture screws about 1 to 1 1/8 turn open. air fuel ratio at idle when engine warm should read around 11 to 12 AF. |
All cobra work has stopped while the house is being painted. Wil check back in couple of days. Thanks for all the help.
Ted |
My KC482 runs rich according to A/F ratio meter. between 11.5 (idlle) and 12.6 most of the rpm range. But the plugs look good, light brown. So the A/F meter is not so precise, at least on these engines.
Idle screws are 1,5 turn out specially to prevent popping from the exhaust. I am running 21º initial and 38º max. Have made myself a special larger stop bush which is oval, otherwise it will not fit into the distributor placement for it. I have 65 idle jets with 100 idle holder. tried 120 . ran leaner (around 13 A/F) but transition was not as smooth. Maybe 110 would be an option to try. Main is 155 with a self made emulsion tube, F11 also ran good. Important is to have a small air jet, I use 120,(carb comes with 210) in order not to lean out on WOT. Chokes are 40mm , 37mm were impossible to tune well on mine. Pump bypass is 00 now, and will check if a .35 bypass will do away with the black cloud my friends tell me I shoot out the exhaust when accelerating hard. Engine runs smooth, transition is spotless. EFI will give you better mileage, but the instant response of the Webers will not be there. And I just do not want electronics in my Cobra. |
"EFI will give you better mileage, but the instant response of the Webers will not be there."
"And I just do not want electronics in my Cobra." AMEN to that! |
Eljaro wrote
"black cloud my friends tell me I shoot out the exhaust when accelerating hard." Sounds like you might be sucking oil out under hard acceleration. Eljaro Are you running pcv? If so where is it connected to? |
Motorhead:
If you do not have metric drills a combination of miniature "Numbered" and "Lettered" drills will work just as well, you'll need a conversion chart. |
Quote:
Black smoke is too rich or unburned fuel |
Un burnt fuel mixed with oil will come out as dark grey
Can easy be mistake for nothing but rich is your pvc connected to vacuum on intake, carb or exhaust header? |
no PVC here with Weber manifold. Crancase fumes go into a catch tank and then out into the air.
Exhaust soot is black, not dark gray, so only gasoline in excess when pump comes in. |
Ok
Defanetly fuel then For your cubics I would change to 80 idle 130 idle air This will allow you to close idle mix screws to about 1 to 1 1/8 turns open Main 165 Main air 180 Pump jet .5 Pump exhaust .6 to .8 You may not agree but.... |
Quote:
Do you have this setup in your car or is this experience setting up Ford BB's with Webers? A 75 idle jet with the 120 idle air (which is what I had in my jets box) worked very well, no more sneezing out the carb and idle mixture quite close to ideal A/F ratio. Before going on and purchasing any extra jets I would like to know how you arrived at the above settings. Thanks |
Eljaro wrote:
"Do you have this setup in your car or is this experience setting up Ford BB's with Weber's?" Hello Eljaro. Sorry for the really late response. Yes i have this set up in my car. As for my experience, like most with Weber's, its all calculated trial and error. |
| All times are GMT -7. The time now is 02:55 AM. |
Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
The representations expressed are the representations and opinions of the clubcobra.com forum members and do not necessarily reflect the opinions and viewpoints of the site owners, moderators, Shelby American, any other replica manufacturer, Ford Motor Company. This website has been planned and developed by clubcobra.com and its forum members and should not be construed as being endorsed by Ford Motor Company, or Shelby American or any other manufacturer unless expressly noted by that entity. "Cobra" and the Cobra logo are registered trademarks for Ford Motor Co., Inc. clubcobra.com forum members agree not to post any copyrighted material unless the copyrighted material is owned by you. Although we do not and cannot review the messages posted and are not responsible for the content of any of these messages, we reserve the right to delete any message for any reason whatsoever. You remain solely responsible for the content of your messages, and you agree to indemnify and hold us harmless with respect to any claim based upon transmission of your message(s). Thank you for visiting clubcobra.com. For full policy documentation refer to the following link: