 Good weber starting point for a 2 liter, For weber 40's |
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| bondo |
 Jan 21 2007, 08:17 PM
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#1
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Practicing my perpendicular parking  Group: Members Posts: 4,277 Joined: 19-April 03 From: Los Osos, CA Member No.: 587 Region Association: Central California  |
Bear with me because it's been a while since I've done carb stuff and I don't remeber all the names of the bits. (IMG:style_emoticons/default/smile.gif)
I'm rebuilding a couple webers for markb, and he's going to use them on a 2 liter. Here's what they have: Venturis: 28 Thing above the venturis: 45 Idle jets: 45 Main jet assembly numbers starting from the top: 200, F11, 110 Accelerator pump jets: 50 Accelerator pump check valve: 55 I have another set of carbs to pull parts from that have the following: Venturis: 28 Thing above the venturis: 45 Idle jets: 50 Main jet assembly numbers starting from the top: 200, F11, 115 Accelerator pump jets: 50 Accelerator pump check valve: 55 I realize there's not much different, but of what I've got, what will be the best starting point to minimize the amount of tuning later? |
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Replies(1 - 19)
| Rusty |
Jan 21 2007, 08:22 PM
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#2
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Wanted: Engine case GA003709 Group: Admin Posts: 7,941 Joined: 24-December 02 From: North Alabama Member No.: 6 Region Association: Galt's Gulch 
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For a 2.0/4 or a 2.0/6? (IMG:style_emoticons/default/idea.gif)
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| bondo |
Jan 21 2007, 08:23 PM
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#3
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Practicing my perpendicular parking Group: Members Posts: 4,277 Joined: 19-April 03 From: Los Osos, CA Member No.: 587 Region Association: Central California |
QUOTE(Lawrence @ Jan 21 2007, 06:22 PM)  Hehe, /4. |
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| Aaron Cox |
Jan 21 2007, 08:37 PM
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#4
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
32 vents...
125-140 mains depending on cam etc.... airs? - around 170-200 50 idles... f11 emulsions and the jet stacks you pulled F11 - emulsion, 200 is aircorrectopn, 110/115 main jet |
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| bondo |
Jan 21 2007, 08:58 PM
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#5
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Practicing my perpendicular parking Group: Members Posts: 4,277 Joined: 19-April 03 From: Los Osos, CA Member No.: 587 Region Association: Central California |
QUOTE(Aaron Cox @ Jan 21 2007, 06:37 PM) 32 vents... 125-140 mains depending on cam etc.... airs? - around 170-200 50 idles... f11 emulsions and the jet stacks you pulled F11 - emulsion, 200 is aircorrectopn, 110/115 main jet 32 venturis! Yikes. Is that because a 2.0 really should have 44s instead of 40s? |
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| Twystd1 |
Jan 21 2007, 09:06 PM
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#6
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You don't want to know... really..... Group: Members Posts: 2,514 Joined: 12-September 04 From: Newport Beach, California Member No.: 2,743 |
Unless these 40s are for a VERY high performance 2.0
Your 40s are more than adequate. C |
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| bondo |
Jan 21 2007, 09:09 PM
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#7
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Practicing my perpendicular parking Group: Members Posts: 4,277 Joined: 19-April 03 From: Los Osos, CA Member No.: 587 Region Association: Central California |
Ok, one more question... What's the correct float height setting? My weber book went to Hammy with the engine/webers I sold him. (IMG:style_emoticons/default/smile.gif)
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| sww914 |
Jan 21 2007, 09:34 PM
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#8
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Advanced Member Group: Members Posts: 2,439 Joined: 4-June 06 Member No.: 6,146 Region Association: None |
Bondo, I can help you with the float height, it's easy. I drop off & pick up my son at the school across the street every day. Let me know and I can stop by.
Steve |
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| John |
Jan 21 2007, 09:35 PM
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#9
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member? what's a member? Group: Members Posts: 3,393 Joined: 30-January 04 From: Evansville, IN (SIRPCA) Member No.: 1,615 Region Association: None |
What else has been done to the engine?
In ours, many moons ago, we ran 40's, because that is what people at the time recommended. In retrospect, 44's would have been a better choice. The 28mm chokes were stock with our 40's. We bought 32mm chokes and it was better. We had the 28mm chokes opened up to about 34mm at a machine shop and it ran even better (the best it ever did). I believe: F11 emulsion tubes 180 air corrector jets 135 main jets 50 idle jets The engine was: 2.0 Euro Pistons Rebuilt stockish heads (new seats, guides, valves, springs, retainers) WebCam (don't know the grind, but it was what "everyone" recommended 20 years ago). 4 - 2 - 1 header, with stub pipes (make unknown but could be looked up) with a Phase 9 muffler. For a street engine the 28mm chokes should be fine, I would work to get the idle jets dialed in well. On a street engine, most of your driving will be at part throttle and that will be depending on the idle circuits. just my $0.02 |
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| Twystd1 |
Jan 21 2007, 09:36 PM
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#10
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You don't want to know... really..... Group: Members Posts: 2,514 Joined: 12-September 04 From: Newport Beach, California Member No.: 2,743 |
(edited post)
There is a standard float adjustment that works for base line adjusting. Go to REDLINE or CB performance and look it up. In truth... The float adjustment can be used to help change transition and main fuel flow. If you adjust it a bit high.. the emulsion tube/main jets get less aeration of the fuel and more pure fuel. Higher bowl settings... the opposite happens. Just in case ya wanted to know... C |
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| Aaron Cox |
Jan 21 2007, 09:38 PM
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#11
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
10 or 12mm depending on book for float height...
32's are for a base 2.0 i run 34's in my hot cammer'd one... 2056's are the toss up between 32's and 34's... |
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| Aaron Cox |
Jan 21 2007, 09:39 PM
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#12
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
QUOTE(Twystd1 @ Jan 21 2007, 07:36 PM) If you adjust it a bit low.. the emulsion tube/main jets get less aeration of the fuel and more pure fuel. Higher bowl settings... the opposite happens. C isnt that backwards? less fuel in bowl... less fuel thru the emulsion tube..more airation check your email dude. |
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| John |
Jan 21 2007, 09:40 PM
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#13
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member? what's a member? Group: Members Posts: 3,393 Joined: 30-January 04 From: Evansville, IN (SIRPCA) Member No.: 1,615 Region Association: None |
The float should be 10mm in the full position, and should have 22.5mm travel (32.5 mm empty).
This distance is measured from the top cover without gasket in place. I could scan something if you want to see it. |
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| r_towle |
Jan 21 2007, 09:41 PM
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#14
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Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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Hi,
buy your parts from aircooled.net. They will swap parts with you till the motor runs perfect. If the vents are to big, it runs to rich, so read the plugs. Rich |
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| Aaron Cox |
Jan 21 2007, 09:47 PM
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#15
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
QUOTE(r_towle @ Jan 21 2007, 07:41 PM) Hi, buy your parts from aircooled.net. They will swap parts with you till the motor runs perfect. If the vents are to big, it runs to rich, so read the plugs. Rich vents have more to do with intake velocity no? you can go to smaller jets even with bigger vents |
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| r_towle |
Jan 21 2007, 09:51 PM
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#16
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Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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my experience was that larger vents made the car run richer...dont know why, it just did...
I kept all the rest the same, and kept stepping DOWN in vents till the plugs were perfect......again, no idea why... Rich |
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| Twystd1 |
Jan 21 2007, 09:53 PM
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#17
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You don't want to know... really..... Group: Members Posts: 2,514 Joined: 12-September 04 From: Newport Beach, California Member No.: 2,743 |
AA.... U B right....
I wrote it backassward....... Such is the beauty of senility. I forget that I know what I don't know even when I know it. Oh.. Man... I need some coffee and viagra..... I mean aspirin.... (IMG:style_emoticons/default/drooley.gif) I'll go back and edit the post so I don't screw somebody up... C |
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| Aaron Cox |
Jan 21 2007, 09:58 PM
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#18
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
QUOTE(r_towle @ Jan 21 2007, 07:51 PM) my experience was that larger vents made the car run richer...dont know why, it just did... I kept all the rest the same, and kept stepping DOWN in vents till the plugs were perfect......again, no idea why... Rich think of a river... a restriction (smaller venT) makes it flow faster.... a wider river flows slower.... so now begging the question (and thinking you are mistaken at the same time) doesnt more air velocity rushing by= more fuel sucked in an atomized? |
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| r_towle |
Jan 21 2007, 10:01 PM
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#19
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Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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again...no idea why it worked.
I was reading, learning, all the same stuff. I had changed all the jets, no good. When I changed the vents, to smaller...it did not run as rich...go figure...but it worked. I was on the phone with the aircooled guys 30 min after each set of parts came up...till we tuned in on the venturis... Baffled me...but when I got it,,,I was happy.. Rich |
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| Aaron Cox |
Jan 21 2007, 10:04 PM
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#20
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
groovy (IMG:style_emoticons/default/smile.gif)
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