The Ford Barn

michael a · 03-03-2018, 10:47 AM

Is there a good information site where it explains to you how to sync these carburetors any help would be greatly appreciated thank you in advance

Sent from my SM-J700T using Tapatalk

drolston · 03-03-2018, 11:03 AM

The instructions that come with the carb synchronizer (the one with the bead in the tube) are pretty good.

adileo · 03-03-2018, 11:12 AM

Quote:

Originally Posted by drolston

The instructions that come with the carb synchronizer (the one with the bead in the tube) are pretty good.

Agree available on eBay;

BUBBAS IGNITION · 03-03-2018, 11:31 AM

I like this sync tool better than the old style ball type. Works really well....

https://www.ebay.com/itm/Empi-Univer...5aA6m7&vxp=mtr

Terry,OH · 03-03-2018, 01:12 PM

It is VERY simple. your going to adjust the idle RPM adjustment so both Carbs. draw equal venturi vacuum as measured with either of the two devices as shown above at idle. In effect both Carbs. will contribute equally to idle. If when this is done idle adj is too high than lower the idle adj. on both equally for your desired RPM then recheck and readjust. If you adjust idle mixture and the idle RPM changes, then again readjust the sync.

john in illinois · 03-04-2018, 09:03 AM

Sponsored Links (Register now to hide all advertisements)

Also the throttle linkage needs to be loose. tighten after synching.

John

Terry,OH · 03-04-2018, 09:48 AM

John is correct, disconnect the linkage connecting the two carbs together, before starting and replace when done. If you don't then a adjustment on eather carb RPM would effect the other.

V8 Bob · 03-04-2018, 11:09 AM

The very first thing to do is make sure the two carbs are exactly the same, including jetting, PV, and float settings, assuming the normal straight linkage settup. If the carbs have no history or questionable assembly, run each carb on a stock intake and monitor vacuum levels during idle bleed and rpm adjustments, which should match. This will ensure the carbs will easily sync and run trouble free on the dual intake.

Ol' Ron · 03-04-2018, 05:27 PM

Before the invention of all these tuning aides, we used to set the idle screws by running our hand over the carbs, until l they were both the same. Simple and effective,

uncle max · 03-04-2018, 07:17 PM

Quote:

Originally Posted by Ol' Ron

Before the invention of all these tuning aides, we used to set the idle screws by running our hand over the carbs, until l they were both the same. Simple and effective,

Along the same way of thinking... The idle mixture screws can be adjusted nicely by cutting a two foot length of vacuum hose, stick one end down the carb and the other end in your ear. Moving the end in the carb from side to side and listening for the same exact percolating/hissing sound while adjusting the screws and you're there!
Works great for removing earwax in the event of a backfire as well!

scicala · 03-05-2018, 08:19 AM

Quote:

Originally Posted by uncle max

Along the same way of thinking... The idle mixture screws can be adjusted nicely by cutting a two foot length of vacuum hose, stick one end down the carb and the other end in your ear. Moving the end in the carb from side to side and listening for the same exact percolating/hissing sound while adjusting the screws and you're there!
Works great for removing earwax in the event of a backfire as well!

Thanks Max and 'Ole Ron,

I love these old simple and effective tricks to diagnose and tune.

Sal

Talkwrench · 03-05-2018, 07:46 PM

Quote:

Originally Posted by uncle max

Along the same way of thinking... The idle mixture screws can be adjusted nicely by cutting a two foot length of vacuum hose, stick one end down the carb and the other end in your ear. Moving the end in the carb from side to side and listening for the same exact percolating/hissing sound while adjusting the screws and you're there!
Works great for removing earwax in the event of a backfire as well!

Hahaha more like removing your ear!

Im for a synchroniser and a vacuum gauge.. (and maybe the wisest move going back to a single carb ; )

expavr · 03-06-2018, 02:58 AM

“Works great for removing earwax in the event of a backfire as well!”

�� You missed your calling as a standup comedian....

chap52 · 03-06-2018, 07:17 AM

Search "unisync" on this site, lots of info.
I use a unisync because after all of these years of developing my "selective hearing" I left the hissing frequency out, Chap

prpmmp · 03-06-2018, 07:21 AM

https://www.jalopyjournal.com/forum/...c-tech.124624/ Pete

03-03-2018, 10:47 AM	#1
michael a Senior Member Join Date: Feb 2015 Location: Lone Jack Missouri Posts: 381	Dual carburetors Is there a good information site where it explains to you how to sync these carburetors any help would be greatly appreciated thank you in advance Sent from my SM-J700T using Tapatalk

03-03-2018, 11:03 AM	#2
drolston Senior Member Join Date: Jun 2014 Location: Williamsburg, VA Posts: 1,627	Re: Dual carburetors The instructions that come with the carb synchronizer (the one with the bead in the tube) are pretty good.

03-03-2018, 11:31 AM	#4
BUBBAS IGNITION Senior Member Join Date: May 2010 Location: SPEEDWAY INDIANA Posts: 4,148	Re: Dual carburetors I like this sync tool better than the old style ball type. Works really well.... https://www.ebay.com/itm/Empi-Univer...5aA6m7&vxp=mtr __________________ If it Makes Spark, we do it !!!! www.bubbasignition.com [email protected]

03-03-2018, 01:12 PM	#5
Terry,OH Senior Member Join Date: May 2010 Posts: 4,743	Re: Dual carburetors It is VERY simple. your going to adjust the idle RPM adjustment so both Carbs. draw equal venturi vacuum as measured with either of the two devices as shown above at idle. In effect both Carbs. will contribute equally to idle. If when this is done idle adj is too high than lower the idle adj. on both equally for your desired RPM then recheck and readjust. If you adjust idle mixture and the idle RPM changes, then again readjust the sync.

03-04-2018, 09:03 AM	#6
john in illinois Senior Member Join Date: May 2010 Location: Illinois Posts: 2,183	Re: Dual carburetors Sponsored Links (Register now to hide all advertisements) Also the throttle linkage needs to be loose. tighten after synching. John

03-04-2018, 09:48 AM	#7
Terry,OH Senior Member Join Date: May 2010 Posts: 4,743	Re: Dual carburetors John is correct, disconnect the linkage connecting the two carbs together, before starting and replace when done. If you don't then a adjustment on eather carb RPM would effect the other.

03-04-2018, 11:09 AM	#8
V8 Bob Senior Member Join Date: May 2010 Location: Granger (Northern) Indiana Posts: 1,520	Re: Dual carburetors The very first thing to do is make sure the two carbs are exactly the same, including jetting, PV, and float settings, assuming the normal straight linkage settup. If the carbs have no history or questionable assembly, run each carb on a stock intake and monitor vacuum levels during idle bleed and rpm adjustments, which should match. This will ensure the carbs will easily sync and run trouble free on the dual intake.

03-04-2018, 05:27 PM	#9
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,857	Re: Dual carburetors Before the invention of all these tuning aides, we used to set the idle screws by running our hand over the carbs, until l they were both the same. Simple and effective,

03-06-2018, 02:58 AM	#13
expavr Senior Member Join Date: May 2010 Location: Hansville, WA Posts: 776	Re: Dual carburetors “Works great for removing earwax in the event of a backfire as well!” �� You missed your calling as a standup comedian....

03-06-2018, 07:17 AM	#14
chap52 Senior Member Join Date: Jun 2013 Location: Marana Arizona Posts: 1,776	Re: Dual carburetors Search "unisync" on this site, lots of info. I use a unisync because after all of these years of developing my "selective hearing" I left the hissing frequency out, Chap

03-06-2018, 07:21 AM	#15
prpmmp Senior Member Join Date: Jun 2013 Location: west grove Pa. Posts: 238	Re: Dual carburetors https://www.jalopyjournal.com/forum/...c-tech.124624/ Pete