The Ford Barn

39topless · 08-11-2014, 01:41 PM

Can't seem to find any tech support for adjusting (tuning) a 3 x 2 setup with three 97's. Any help would be appreciated.
Thanks, Phil

36tbird · 08-11-2014, 02:09 PM

what kind of linkage, progressive or straight?

39topless · 08-11-2014, 05:46 PM

Believe it would be classified as progressive. Pedal to middle carb, then linked to front and back carbs with one linkage. Should mention that it is running very rich.
Thank you

Binx · 08-11-2014, 06:43 PM

You may find something here..

http://www.btc-bci.com/~billben/flathead.htm

Lonnie

Terry,OH · 08-11-2014, 07:39 PM

Progressive and the car runs on the center Carb. until you depress the pedal enough to start to open the front and rear (dumper) Carbs. The dumpers do not use their idle circuits. Straight linkage and all three Carbs work at the same time (from idle to full throttle) I would recommend the progressive IMHO. Check out the Stromberg web site (tech center) and if you can not find an answer to your questions contact Uncle Max.

BUBBAS IGNITION · 08-11-2014, 08:35 PM

Sponsored Links (Register now to hide all advertisements)

Theres a group on the hamb board of carb questions set ups etc , most are 94 carbs but set up theory is the same . I have used this groups postings many times , some of them have it figured out...

http://www.jalopyjournal.com/forum/s...-94-group.232/

36tbird · 08-12-2014, 08:18 AM

Phil, you are right to address this issue. I had a friend who ran 3x2 with straight linkage. It ran very rich to the point that it carboned up the valve seats excessively. Finally one valve top broke off due to the carbon build up and the now loose valve top destroyed the valve seat area as it careened around in there. Block was a total loss.

flathead4rd · 08-12-2014, 08:31 AM

Depends on on what engine modifications you have . More info needed. I run three 97's with straight linkage and have no problems.

V8 Bob · 08-12-2014, 08:50 AM

I, along with many others, have been running straight linkage with 3 97s for many years and thousands of miles, with no problems or ill effects. The carbs have to be built and jetted properly, usually with #43 mains and # 69 power valves, along with careful synchronization. The result is very crisp throttle response and decent (20 mpg) highway millage. Intake manifold design and manufacture can vary in performance, but the Navarro I'm using works great with straight linkage. The only negative may be slightly worse city stop/go millage v.s. running progressive linkage.

uncle max · 08-12-2014, 10:55 AM

... A page from my book!

Quote:

Originally Posted by V8 Bob

I, along with many others, have been running straight linkage with 3 97s for many years and thousands of miles, with no problems or ill effects. The carbs have to be built and jetted properly, usually with #43 mains and # 69 power valves, along with careful synchronization. The result is very crisp throttle response and decent (20 mpg) highway millage. Intake manifold design and manufacture can vary in performance, but the Navarro I'm using works great with straight linkage. The only negative may be slightly worse city stop/go millage v.s. running progressive linkage.

39topless · 08-12-2014, 11:36 AM

Wow, you guys are great. Lots of really good info. The only other engine mods are finned heads and remote coil. Right now I have to remove and clean the spark plugs about every 100 miles. Maybe I can make the adjustments and lean it down. Thanks so much.
Phil

39topless · 08-12-2014, 12:11 PM

Quote:

Originally Posted by 36tbird

Phil, you are right to address this issue. I had a friend who ran 3x2 with straight linkage. It ran very rich to the point that it carboned up the valve seats excessively. Finally one valve top broke off due to the carbon build up and the now loose valve top destroyed the valve seat area as it careened around in there. Block was a total loss.

Wow1 Thanks for the warning. I'll try to get this leaned up before driving it much.
Phil

39topless · 08-12-2014, 12:18 PM

Quote:

Originally Posted by uncle max

... A page from my book!

The ultimate compliment!!!!

36tbird · 08-12-2014, 12:53 PM

Yo Max, I do run my 2 Uncle Max 81's straight.

my4dv8 · 08-12-2014, 02:19 PM

You can not really run 2x2 successfully any other way than straight.

Quote:

Originally Posted by 36tbird

Yo Max, I do run my 2 Uncle Max 81's straight.

36tbird · 08-12-2014, 05:04 PM

Uh yeah, hence the "wink".

V8 Bob · 08-13-2014, 08:09 AM

Quote:

Originally Posted by 39topless

The ultimate compliment!!!!

I agree....thanks Max.

Oh, and my 97s came from Uncle max.

Bruce Lancaster · 08-13-2014, 08:39 AM

The Carbfather speaks! Now, about that book...

39topless · 08-17-2014, 03:43 PM

I've learned a lot from the sources suggested by you all. Thanks again. I turned the jets down on the middle carb to a very lean setting and cleaned the spark plugs. Drove about a mile to the store, returned home and removed a plug. Found it to be completely black with carbon (after 1 mile!). Would there be any advantage to disconnecting the two dumper carbs and just work with the middle one until I get the thing running right and then reconnect the dumpers? Sorry for my ignorance but this is my first three carb setup.

scooder · 08-17-2014, 03:51 PM

When you said "I turned the jets down on the middle carb to a very lean setting" you talking about the idle mixture screws on the base of the carb?
This does not affect the main jets, these are different, and unless you have adjustable main jets, and your actually adjusting these.
What you adjusting?
Martin.

08-11-2014, 01:41 PM	#1
39topless Senior Member Join Date: Sep 2013 Posts: 1,027	adjusting 3 / 2's Can't seem to find any tech support for adjusting (tuning) a 3 x 2 setup with three 97's. Any help would be appreciated. Thanks, Phil

08-11-2014, 02:09 PM	#2
36tbird Senior Member Join Date: May 2010 Location: nw SanAntonio, TX Posts: 940	Re: adjusting 3 / 2's what kind of linkage, progressive or straight?

08-11-2014, 05:46 PM	#3
39topless Senior Member Join Date: Sep 2013 Posts: 1,027	Re: adjusting 3 / 2's Believe it would be classified as progressive. Pedal to middle carb, then linked to front and back carbs with one linkage. Should mention that it is running very rich. Thank you

08-11-2014, 07:39 PM	#5
Terry,OH Senior Member Join Date: May 2010 Posts: 5,394	Re: adjusting 3 / 2's Progressive and the car runs on the center Carb. until you depress the pedal enough to start to open the front and rear (dumper) Carbs. The dumpers do not use their idle circuits. Straight linkage and all three Carbs work at the same time (from idle to full throttle) I would recommend the progressive IMHO. Check out the Stromberg web site (tech center) and if you can not find an answer to your questions contact Uncle Max.

08-11-2014, 08:35 PM	#6
BUBBAS IGNITION Senior Member Join Date: May 2010 Location: SPEEDWAY INDIANA Posts: 4,148	Re: adjusting 3 / 2's Sponsored Links (Register now to hide all advertisements) Theres a group on the hamb board of carb questions set ups etc , most are 94 carbs but set up theory is the same . I have used this groups postings many times , some of them have it figured out... http://www.jalopyjournal.com/forum/s...-94-group.232/ __________________ If it Makes Spark, we do it !!!! www.bubbasignition.com [email protected]

08-11-2014, 06:43 PM	#4
Binx Senior Member Join Date: Oct 2011 Location: Gloucester VA Posts: 1,042	Re: adjusting 3 / 2's You may find something here.. http://www.btc-bci.com/~billben/flathead.htm Lonnie

08-12-2014, 08:18 AM	#7
36tbird Senior Member Join Date: May 2010 Location: nw SanAntonio, TX Posts: 940	Re: adjusting 3 / 2's Phil, you are right to address this issue. I had a friend who ran 3x2 with straight linkage. It ran very rich to the point that it carboned up the valve seats excessively. Finally one valve top broke off due to the carbon build up and the now loose valve top destroyed the valve seat area as it careened around in there. Block was a total loss.

08-12-2014, 08:31 AM	#8
flathead4rd Senior Member Join Date: May 2010 Location: Michigan Posts: 583	Re: adjusting 3 / 2's Depends on on what engine modifications you have . More info needed. I run three 97's with straight linkage and have no problems.

08-12-2014, 08:50 AM	#9
V8 Bob Senior Member Join Date: May 2010 Location: Granger (Northern) Indiana Posts: 1,611	Re: adjusting 3 / 2's I, along with many others, have been running straight linkage with 3 97s for many years and thousands of miles, with no problems or ill effects. The carbs have to be built and jetted properly, usually with #43 mains and # 69 power valves, along with careful synchronization. The result is very crisp throttle response and decent (20 mpg) highway millage. Intake manifold design and manufacture can vary in performance, but the Navarro I'm using works great with straight linkage. The only negative may be slightly worse city stop/go millage v.s. running progressive linkage.

08-12-2014, 11:36 AM	#11
39topless Senior Member Join Date: Sep 2013 Posts: 1,027	Re: adjusting 3 / 2's Wow, you guys are great. Lots of really good info. The only other engine mods are finned heads and remote coil. Right now I have to remove and clean the spark plugs about every 100 miles. Maybe I can make the adjustments and lean it down. Thanks so much. Phil

08-12-2014, 12:53 PM	#14
36tbird Senior Member Join Date: May 2010 Location: nw SanAntonio, TX Posts: 940	Re: adjusting 3 / 2's Yo Max, I do run my 2 Uncle Max 81's straight.

08-12-2014, 05:04 PM	#16
36tbird Senior Member Join Date: May 2010 Location: nw SanAntonio, TX Posts: 940	Re: adjusting 3 / 2's Uh yeah, hence the "wink".

08-13-2014, 08:39 AM	#18
Bruce Lancaster Member Emeritus Join Date: May 2010 Location: Madison, NJ Posts: 5,230	Re: adjusting 3 / 2's The Carbfather speaks! Now, about that book...

08-17-2014, 03:43 PM	#19
39topless Senior Member Join Date: Sep 2013 Posts: 1,027	Re: adjusting 3 / 2's I've learned a lot from the sources suggested by you all. Thanks again. I turned the jets down on the middle carb to a very lean setting and cleaned the spark plugs. Drove about a mile to the store, returned home and removed a plug. Found it to be completely black with carbon (after 1 mile!). Would there be any advantage to disconnecting the two dumper carbs and just work with the middle one until I get the thing running right and then reconnect the dumpers? Sorry for my ignorance but this is my first three carb setup.

08-17-2014, 03:51 PM	#20
scooder Senior Member Join Date: Jul 2010 Posts: 2,597	Re: adjusting 3 / 2's When you said "I turned the jets down on the middle carb to a very lean setting" you talking about the idle mixture screws on the base of the carb? This does not affect the main jets, these are different, and unless you have adjustable main jets, and your actually adjusting these. What you adjusting? Martin.