 Snail numbers, Average? |
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| bandjoey |
 Oct 24 2017, 10:43 AM
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#1
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bandjoey  Group: Members Posts: 4,926 Joined: 26-September 07 From: Bedford Tx Member No.: 8,156 Region Association: Southwest Region  |
2.0 stock with dellortos.
Valve adjustment is completed and getting ready to sync the carburetors. Linkage is disconnected Right now before any adjustments. one and two cylinders are sitting equally a hair under 6. Numbers four and three are sitting on seven and five respectfully Using the snail to sync the carbs is there a standard number to shoot for and what is the best rpm while syncing the carbs Attached image(s) 
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| iankarr |
Oct 24 2017, 10:52 AM
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#2
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The wrencher formerly known as Cuddy_K Group: Members Posts: 2,473 Joined: 22-May 15 From: Heber City, UT Member No.: 18,749 Region Association: Intermountain Region 
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My 2056 with weber IDF 40s and 34 vents pulled 7 across the board once all tuned and synched up.
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| nditiz1 |
Oct 24 2017, 11:14 AM
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#3
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Senior Member Group: Members Posts: 1,188 Joined: 26-May 15 From: Mount Airy, Maryland Member No.: 18,763 Region Association: MidAtlantic Region
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QUOTE(cuddyk @ Oct 24 2017, 08:52 AM)  My 2056 with weber IDF 40s and 34 vents pulled 7 across the board once all tuned and synched up. I wondered the same thing. My 2056 with unknown carb cam and weber 40 IDFs (28 vents) is 5. That brings the idle to 1000. I could increase them or decrease them to move the idle up or down. Not real sure where it should sit so I set them to just under 5 for 950. |
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| bandjoey |
Oct 24 2017, 12:22 PM
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#4
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bandjoey Group: Members Posts: 4,926 Joined: 26-September 07 From: Bedford Tx Member No.: 8,156 Region Association: Southwest Region |
With dead on valves set cold, timing set for carbs, idle 1000 rpm on a sun meter, I get 1,2,3 at 5 and 4 at 6. Motor warmed up properly too. Runs great. That all I have time for today. I'll dig out the CB book later to look at 4 again.
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| bandjoey |
Oct 24 2017, 12:22 PM
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#5
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bandjoey Group: Members Posts: 4,926 Joined: 26-September 07 From: Bedford Tx Member No.: 8,156 Region Association: Southwest Region |
Sorry. Duplicate
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| yeahmag |
Oct 24 2017, 01:16 PM
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#6
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Advanced Member Group: Members Posts: 2,421 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California
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It’s more important that all cylinders are equal than the actual number.
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| ottox914 |
Oct 24 2017, 08:45 PM
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#7
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The glory that once was. Group: Members Posts: 1,302 Joined: 15-December 03 From: Mahtomedi, MN Member No.: 1,438 Region Association: Upper MidWest  |
Differences in engine configuration can affect the "number". Gauge accuracy will be a factor in the "number" as well. Having the number matching is the thing here. All 4 holes drawing the same amount of air makes for a more balanced engine. Easier to tune, more powerful, smoother running.
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| bandjoey |
Oct 24 2017, 08:54 PM
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#8
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bandjoey Group: Members Posts: 4,926 Joined: 26-September 07 From: Bedford Tx Member No.: 8,156 Region Association: Southwest Region |
TIMING GOOF OR OK?
Set the timing at 3500rpm and 35* due to a brain fart. Went out for a 5 mile up the freeway run. Pulls strong. Runs great. Now I think it should have been 27*. Move it back or run it. ?? |
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| yeahmag |
Oct 24 2017, 09:01 PM
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#9
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Advanced Member Group: Members Posts: 2,421 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California
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Move it to 28BTDC for starters consider 30 max for now.
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| iankarr |
Oct 24 2017, 09:14 PM
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#10
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The wrencher formerly known as Cuddy_K Group: Members Posts: 2,473 Joined: 22-May 15 From: Heber City, UT Member No.: 18,749 Region Association: Intermountain Region
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QUOTE(ottox914 @ Oct 24 2017, 10:45 PM) Differences in engine configuration can affect the "number". Gauge accuracy will be a factor in the "number" as well. Having the number matching is the thing here. All 4 holes drawing the same amount of air makes for a more balanced engine. Easier to tune, more powerful, smoother running. (IMG:style_emoticons/default/agree.gif) Consistency is key. Here's a good article on how to do a full tune... http://www.pelicanparts.com/techarticles/1...Carburetors.htm |
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| Elliot Cannon |
Oct 24 2017, 09:30 PM
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#11
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914 Guru Group: Retired Members Posts: 8,487 Joined: 29-December 06 From: Paso Robles Ca. (Central coast) Member No.: 7,407 Region Association: None
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QUOTE(ottox914 @ Oct 24 2017, 07:45 PM) Differences in engine configuration can affect the "number". Gauge accuracy will be a factor in the "number" as well. Having the number matching is the thing here. All 4 holes drawing the same amount of air makes for a more balanced engine. Easier to tune, more powerful, smoother running. (IMG:style_emoticons/default/agree.gif) All mine hover around 5. (IMG:style_emoticons/default/biggrin.gif) |
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| 914EURO |
Oct 25 2017, 07:58 AM
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#12
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Newbie Group: Members Posts: 24 Joined: 30-August 17 From: Long Island, NY Member No.: 21,390 Region Association: North East States |
Good information here. Thanks.
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| Ansbacher |
Oct 25 2017, 10:23 AM
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#13
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Senior Member Group: Members Posts: 689 Joined: 4-July 14 From: Tampa Bay, Florida Member No.: 17,589 |
I am running 40 IDFs with 32 vents. I measure 5 at 950 RPM idle. As far as advance goes, I have NEVER gotten my car to run decently below 32 degrees advance. The 27 degree number comes from a car with original fuel injection installed, not carburetors. Carbs just need more advance from my experience.
Ansbacher '74 2.0 L |
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| McMark |
Oct 25 2017, 01:00 PM
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#14
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
(IMG:style_emoticons/default/agree.gif) The number is completely irrelevant. Your engine configuration and idle speed will dictate the number. So if you're seeing 7 and everyone you talk to says 5, don't fret! Focus on matching numbers, at idle and off idle. Syncing the carbs at idle is less valuable than consistent sync through the range of throttle. And just because it's sync'd at idle doesn't mean it's sync'd anywhere else.
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| Kansas 914 |
Oct 25 2017, 01:41 PM
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#15
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Advanced Member Group: Members Posts: 2,999 Joined: 1-March 03 From: Durango, Colorado Member No.: 373 Region Association: Rocky Mountains
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You could have a slightly twisted throttle plate shaft so one barrel is "off" a bit.
If you don't have the gas pedal stop at the pedal board adjusted correctly you can pull too much on the linkage (depending on what type you have) and twist the shaft a hair. If this is the case you will never get the two cylinders in sync. |
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