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Emulsion Tubes and Tuning

I have a 2.7 RS with 40 IDA 3C. I am 99% sure that my jetting is correct.

I am using F3 emulsion tubes.

I have a stumble at 3700-3900 rpm. The stumble only occurs in first gear at full throttle. I have checked the jetting and the accelerator pump.

I believe that I am rich at this point.

I am considering trying an emulsion tube that will delay the effect of the main by a couple hundred rpm.

Does anyone know of a resource that describes/compares emultion tubes for 40 IDA 3C so that I can pick the right one?

Old 10-13-2003, 01:06 PM
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Hi mdw48009;
I don't mean to hijack your thread but I was just about to post a thread on ID'ing emulsion tubes which would be just as appropriate on this thread. I've got one in front of me and I can't find any sort of marking on it. How can you tell which emulsion tube you have???
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Old 10-13-2003, 01:10 PM
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Never mind, I just found the markings around the bottom of the tube (the most discolored part!) and I guess I have F26's. I can't comment on them since they came in some used carbs that I bought.
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Last edited by jluetjen; 10-13-2003 at 01:18 PM..
Old 10-13-2003, 01:12 PM
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Hello, i am curius !
i have a 2.7 with weber and what is your jets size, idles and mains and venturies ?
Ray
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Old 10-13-2003, 04:26 PM
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I just bought carb parts for my built to RS spec 2.7.

I went with:

34mm Vent
145 Mains
180 Airs
60 Idles
F3 ET

Bruce Anderson's suggestion was this, but for "E" cams, not "S".

34mm Vent
135 Mains
145 Airs
60 Idles
F3 ET

Only 2 data points I have.
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Old 10-13-2003, 04:48 PM
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I have a weber manual that lists the emulsion tubes, and gives the intended use for each tube. i.e F3 for high end power, F1 for economy etc, (dont quote me on those two). The manual is at my friends shop, Ill grab it tomorrow, and scan the appropriate section.
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Old 10-13-2003, 05:21 PM
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I would really like to hear about the different emulsion tube specs too, Tim.

This question comes up often. See this thread and the other pointers from there.

TT
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Old 10-13-2003, 05:36 PM
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what? me worry?
 
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hehe I remember that thread.

One big thing to remember about alot of the weber carbs is that they are old, and hence worn, any air getting by the throttle shafts can f things up big time.

Quote:
I have a stumble at 3700-3900 rpm.
in that rpm range you should be working totally with the main jets..this is where the emulsion tubes work as well. Make sure your ignition is perfect, and valve adjustments etc are good as well

carb tuning is becoming a lost art...
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Redline motors oils
Swepco
1500 hp chassis dyno

Last edited by TimT; 10-14-2003 at 04:10 PM..
Old 10-13-2003, 07:30 PM
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ok here is a scan of the section of manual regarding emulsion tubes.

OT how the f do you scan a page and get good quality, and have i it not be a bazzilion byte file size?

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'75 914 GT-3
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BBS wheels
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Redline motors oils
Swepco
1500 hp chassis dyno
Old 10-14-2003, 04:12 PM
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Tim - Do you have the name of the book, so I can see if I can order a copy?

James
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Old 10-14-2003, 04:23 PM
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here is the prefix to the chart regarding emulsion tubes...

note that the numbers really mean nothing....each tube is individual and has its own charecteristics.... its not like a linear progresion from a F3 to a F26....... use known baselines and fine tune from there....



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who are those guys? <<< ( Butch Cassidy and the Sundance Kid)
Rent a GT3RS from us!! Call or e-mail.
Transportation and Track support
Rudtners Racing

'69 911 GT-5
'75 914 GT-3
Authorised Haltech seller and installer
Authorised Unichip installer
BBS wheels
Fikse wheels
Redline motors oils
Swepco
1500 hp chassis dyno
Old 10-14-2003, 05:54 PM
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Tim;
I think I have the same book. It is titled "Weber Carburetors" by Pat Braden and published by HPBooks. It's available at all of the normal places like Barnes and Noble, Classic Motorbooks, Amazon, etc. It's a great book

Curiously on the pair of IDS's that I'm taking apart, they had F26 emulsion tubes in them and F26 is not shown on the right side column. So what's that mean??? I've got some F3's on order.

PS: As far as scanning in readable stuff -- I don't know. Besides eliminating white space in the margins and shrinking the size, I always have the same problem.
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Old 10-14-2003, 06:10 PM
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John,

F26 means for use with large main jets, or you need more alchohol I think the F3's are a catch all, they "work" you can tune around them... ie with your mains and air correction jets

Ill have to dig around in my "box-o-weber-spares", and Im sure I have emulsion tubes that are not listed in that chart

histories mysteries
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who are those guys? <<< ( Butch Cassidy and the Sundance Kid)
Rent a GT3RS from us!! Call or e-mail.
Transportation and Track support
Rudtners Racing

'69 911 GT-5
'75 914 GT-3
Authorised Haltech seller and installer
Authorised Unichip installer
BBS wheels
Fikse wheels
Redline motors oils
Swepco
1500 hp chassis dyno
Old 10-14-2003, 06:17 PM
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Oh yeah, way down there at the bottom right. Damn my eyes are getting bad!
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'69 911E

"It's a poor craftsman who blames their tools" -- Unknown
"Any suspension -- no matter how poorly designed -- can be made to work reasonably well if you just stop it from moving." -- Colin Chapman
Old 10-14-2003, 06:27 PM
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My source is an ancient Haynes manual......."Owners Workshop, Weber Carburator"
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who are those guys? <<< ( Butch Cassidy and the Sundance Kid)
Rent a GT3RS from us!! Call or e-mail.
Transportation and Track support
Rudtners Racing

'69 911 GT-5
'75 914 GT-3
Authorised Haltech seller and installer
Authorised Unichip installer
BBS wheels
Fikse wheels
Redline motors oils
Swepco
1500 hp chassis dyno

Last edited by TimT; 10-14-2003 at 06:47 PM..
Old 10-14-2003, 06:40 PM
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While we're on the subject, I'm looking for a set (6) of 1.35 or 1.40 main jets (stock, undrilled please). Anyone?

Anyone need a set of 30mm venturis or some 1.25 (I think) main jets?

Thanks,
Sherwood Lee
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Old 10-14-2003, 09:20 PM
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UP-FIXEN, Vol. 6, page 76. F-1 (911T), F-26 (911/911E), F-3 (911S), F-24 (906)
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Old 10-14-2003, 09:29 PM
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I've been thinking a lot about emulsion tubes since to be perfectly honest, the information in the book I have is incomplete at best. For example there is a neat table that lists emulsion tubes F4 - F15 and then different columns for A through F (with no description of what A-F represent! ) The next diagram starts out with a picture of F16. Wait a minute, where did F16 come from, what about A - F???!!!

I did some searching on the web trying to find a complete table of the different E-tubes came across this interesting article.

I'll most likely post some more as I learn more.
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Old 10-15-2003, 04:37 AM
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Quote:
Originally posted by jluetjen
I did some searching on the web trying to find a complete table of the different E-tubes came across this interesting article.
Tim and John-
Thanks for posting that info. I have seen the table from the Haynes manual that Tim posted before, but what I would really like to see are specs and drawings for the complete line of tubes like the two featured in the article that John posted, like this:

Anyone know of a reference?

Thx,
TT
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Old 10-15-2003, 12:10 PM
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Here are the two tables from my book that I mentioned. First a table that looks like it should explain all -- but doesn't

But then next to it is a table that looks like it fills in the gap, but doesn't link at all to the previous table. What's an F16 family???



Just in case you thought you knew something about emulsion tubes prior to this, these two tables seem to ensure that you won't know any more then I do.

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"Any suspension -- no matter how poorly designed -- can be made to work reasonably well if you just stop it from moving." -- Colin Chapman
Old 10-15-2003, 05:07 PM
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