The Ford Barn

Displayman · 07-05-2011, 07:39 PM

We have a stoxck 1947 Mercury, with a Fenton intake and dual stromberg 97's. Carbs have been rebuilt recently. Carbs have been balanced with the Unisys system. Both carbs have been COlor tuned with Gunson's Color
tune. Car was running great. Now it starts bogging when we go over 45 mph. I check fuel filter, fuel regulator is set for 2 1/2, sparkplugs are clean and gapped at .25.
It seems to get worse with the heat. We have been having 95 degree weather lately.
First and second gear runs smoothly, 3 rd runs smooth until 45 mph.
Any suggestions would be appreciated. Something that I am overlooking?

Thanks,
Bob- Hampshire, Illinois

TJ · 07-05-2011, 07:51 PM

Do you have the adjustable pressure regulator( dial type)? If so I have had problems with them. Try adjusting the pressure up to 3 1/2 pounds. If that doesn't help then remove it and see how the car performs.

ken ct · 07-05-2011, 08:29 PM

If your running a pair of those small chrome Chineeze air cleaners ,try running them with/out the filter elememt in them.There was a problem with them a while back as being tooo restrictive. Worth a try if you have them on there. ken ct. A no cost try.

Mr 42 · 07-05-2011, 11:15 PM

Condensor?
Coil?

Displayman · 07-06-2011, 08:23 AM

Thanks for suggestions.
Will try running without aircleaners, and check coil and condensor.
Thanks guys.
Bob

ford1 · 07-06-2011, 09:15 AM

Sponsored Links (Register now to hide all advertisements)

another thought, is the muffler plugged, cars with plugged catalitic converters act the same way

Displayman · 07-06-2011, 10:35 AM

Ken,
Tried running without chrome cleaners.
Actually a little better but, still bogs.
Thanks for the info,

Bob

Displayman · 07-06-2011, 10:36 AM

Car does not have catalytic converter.
Good thought though ,

Thansk,
Bob

ken ct · 07-06-2011, 10:41 AM

Im thinking M Jets too big.I would say around .043 would be about right. Whats in them,hope your not trying to run a progressive type linkage on there. ?? ken ct. And smaller PV's like #66 -67. ken ct.

Displayman · 07-06-2011, 11:13 AM

Ken,
Defintely not running progressive linkage.
Carb was rebuilt by the one of the carb expert here(101 yrs old)
Forgot his name alreday, getting senile. lol
I believe he put in .46 or .48? I really don't remember

ken ct · 07-06-2011, 04:39 PM

Quote:

Originally Posted by Displayman

Ken,
Defintely not running progressive linkage.
Carb was rebuilt by the one of the carb expert here(101 yrs old)
Forgot his name alreday, getting senile. lol
I believe he put in .46 or .48? I really don't remember

I would go to .043 in both,and 3.5 or 4.5 power valves. Your bog could be from stock PV's especially if 7.5. Your getting a rush of so much gas the engine stumbles on it too much gas all at once. ken ct. Also would loose the rubber accel pumps if in there.If your thinking rudy faultiermier,no comment. Also rubber tipped inlet needles. SORRY THIS POST WAS TOTALLY WRONG<I HAD ( FORD CARBS ON THE MIND> LOL ken ct/ senior moment.

Displayman · 07-06-2011, 05:33 PM

NO, Not Rudy.
Thanks for the advice on.043 in both. or 3.5 or 4.5 power valves.

Thanks,
Bob

Displayman · 07-06-2011, 05:38 PM

Ken,
Uncle Max rebuilt these carbs for me.
Really nice guy.

Bob

Charlie ny · 07-06-2011, 06:21 PM

D'man,
If uncle Max rebuilt your Strombergs I'd be surprised, no
shocked, if yours is a carb problem. As you say Max is a good guy...
email him direct.
Charlie ny

russcc · 07-06-2011, 06:41 PM

Is the engine loading up with gas ? If so, did Uncle Max know you were running them as duals when he did them ? If not read Barney Navarro's article, "The problems of dual carburetion", Rod & Custom, April 1954. Too much gas can be as result of 2 accelerator pumps, when only one is needed. The cure is simple, and in the article.

ken ct · 07-06-2011, 07:35 PM

Quote:

Originally Posted by Displayman

Ken,
Uncle Max rebuilt these carbs for me.
Really nice guy.

Bob

I would email him also he knows stroms as well as i or more so,im sure he will straighten them out ,hes a great guy to deal with. My hats off to him and his rebuilding. It may not even BE a carb problem.ken ct. Give him my best. He dosen't hear too well on phone. email.lol

TJ · 07-06-2011, 08:22 PM

I still think it is the adjustable pressure regulator. I've had more than one problem with them. A friend also took his off due to not getting the proper amount of fuel through it.

40Coupe · 07-06-2011, 11:56 PM

I've got a similar issue with my 59A with twin 97's which I rebuilt myself before discovering the coil brush was burned away and replacing coil, condensor, points etc. I installed the Offy regulator and set at 2.5psi and verified that pressure at idle.
Mine breaks up in 1st and 2nd as well at "high" rpms.

Thanks for suggestion for 3.5 psi..TJ..I'll post what I find to see if that helps Bob (don't mean to stomp on his thread for my first post

).
I've got .045s in both carbs, but found .043's in the front carb. Not sure what the PV's are...(whatever the standard Sberg kit comes with)...
I'm at sea level..fwiw

Lane

ken ct · 07-07-2011, 02:09 AM

3.5 lbs pressure is at the limit a strom will tolerate.2-2 1/2 in more like it.How can you be running .045 in both carbs and then say you have .043 in the front one???? Should be .043 in both carbs. And power valves do NOT come in any kits that i know of. Except in OLD Sorensen kits. Stock PV's usually are too big running a 2x2. most run #67-#68 in them. Your running too much gas through them your over carbed. OMO ken ct.

russcc · 07-07-2011, 04:43 AM

If the accelerator pumps have not been modified for dual carb use, that is where I would look. The article by Barney Navarro shows how you drill a small hole in the pump setup to keep the gas level lower in the pumps so they don't give the engine to much gas. Think about it, the gas from 2 accelerator pumps when the engine originally only had pone. Too much!

07-05-2011, 07:39 PM	#1
Displayman Senior Member Join Date: May 2010 Location: Hampshire, Illinois Posts: 392	Cars bogs after 45 mph. We have a stoxck 1947 Mercury, with a Fenton intake and dual stromberg 97's. Carbs have been rebuilt recently. Carbs have been balanced with the Unisys system. Both carbs have been COlor tuned with Gunson's Color tune. Car was running great. Now it starts bogging when we go over 45 mph. I check fuel filter, fuel regulator is set for 2 1/2, sparkplugs are clean and gapped at .25. It seems to get worse with the heat. We have been having 95 degree weather lately. First and second gear runs smoothly, 3 rd runs smooth until 45 mph. Any suggestions would be appreciated. Something that I am overlooking? Thanks, Bob- Hampshire, Illinois

07-05-2011, 07:51 PM	#2
TJ Senior Member Join Date: May 2010 Location: Napa,California Posts: 6,773	Re: Cars bogs after 45 mph. Do you have the adjustable pressure regulator( dial type)? If so I have had problems with them. Try adjusting the pressure up to 3 1/2 pounds. If that doesn't help then remove it and see how the car performs.

07-05-2011, 08:29 PM	#3
ken ct BANNED Join Date: May 2010 Location: stratford,ct Posts: 5,971	Re: Cars bogs after 45 mph. If your running a pair of those small chrome Chineeze air cleaners ,try running them with/out the filter elememt in them.There was a problem with them a while back as being tooo restrictive. Worth a try if you have them on there. ken ct. A no cost try.

07-05-2011, 11:15 PM	#4
Mr 42 Senior Member Join Date: May 2010 Location: Sweden Posts: 427	Re: Cars bogs after 45 mph. Condensor? Coil?

07-06-2011, 08:23 AM	#5
Displayman Senior Member Join Date: May 2010 Location: Hampshire, Illinois Posts: 392	Re: Cars bogs after 45 mph. Thanks for suggestions. Will try running without aircleaners, and check coil and condensor. Thanks guys. Bob

07-06-2011, 09:15 AM	#6
ford1 Senior Member Join Date: May 2010 Location: oroville ca. Posts: 1,554	Re: Cars bogs after 45 mph. Sponsored Links (Register now to hide all advertisements) another thought, is the muffler plugged, cars with plugged catalitic converters act the same way

07-06-2011, 10:35 AM	#7
Displayman Senior Member Join Date: May 2010 Location: Hampshire, Illinois Posts: 392	Re: Cars bogs after 45 mph. Ken, Tried running without chrome cleaners. Actually a little better but, still bogs. Thanks for the info, Bob

07-06-2011, 10:36 AM	#8
Displayman Senior Member Join Date: May 2010 Location: Hampshire, Illinois Posts: 392	Re: Cars bogs after 45 mph. Car does not have catalytic converter. Good thought though , Thansk, Bob

07-06-2011, 10:41 AM	#9
ken ct BANNED Join Date: May 2010 Location: stratford,ct Posts: 5,971	Re: Cars bogs after 45 mph. Im thinking M Jets too big.I would say around .043 would be about right. Whats in them,hope your not trying to run a progressive type linkage on there. ?? ken ct. And smaller PV's like #66 -67. ken ct.

07-06-2011, 11:13 AM	#10
Displayman Senior Member Join Date: May 2010 Location: Hampshire, Illinois Posts: 392	Re: Cars bogs after 45 mph. Ken, Defintely not running progressive linkage. Carb was rebuilt by the one of the carb expert here(101 yrs old) Forgot his name alreday, getting senile. lol I believe he put in .46 or .48? I really don't remember

07-06-2011, 05:33 PM	#12
Displayman Senior Member Join Date: May 2010 Location: Hampshire, Illinois Posts: 392	Re: Cars bogs after 45 mph. NO, Not Rudy. Thanks for the advice on.043 in both. or 3.5 or 4.5 power valves. Thanks, Bob

07-06-2011, 05:38 PM	#13
Displayman Senior Member Join Date: May 2010 Location: Hampshire, Illinois Posts: 392	Re: Cars bogs after 45 mph. Ken, Uncle Max rebuilt these carbs for me. Really nice guy. Bob

07-06-2011, 06:21 PM	#14
Charlie ny BANNED Join Date: May 2010 Posts: 3,019	Re: Cars bogs after 45 mph. D'man, If uncle Max rebuilt your Strombergs I'd be surprised, no shocked, if yours is a carb problem. As you say Max is a good guy... email him direct. Charlie ny

07-06-2011, 06:41 PM	#15
russcc Senior Member Join Date: May 2010 Posts: 2,871	Re: Cars bogs after 45 mph. Is the engine loading up with gas ? If so, did Uncle Max know you were running them as duals when he did them ? If not read Barney Navarro's article, "The problems of dual carburetion", Rod & Custom, April 1954. Too much gas can be as result of 2 accelerator pumps, when only one is needed. The cure is simple, and in the article.

07-06-2011, 08:22 PM	#17
TJ Senior Member Join Date: May 2010 Location: Napa,California Posts: 6,773	Re: Cars bogs after 45 mph. I still think it is the adjustable pressure regulator. I've had more than one problem with them. A friend also took his off due to not getting the proper amount of fuel through it.

07-06-2011, 11:56 PM	#18
40Coupe Junior Member Join Date: Apr 2011 Location: Livermore, Ca Posts: 23	Re: Cars bogs after 45 mph. I've got a similar issue with my 59A with twin 97's which I rebuilt myself before discovering the coil brush was burned away and replacing coil, condensor, points etc. I installed the Offy regulator and set at 2.5psi and verified that pressure at idle. Mine breaks up in 1st and 2nd as well at "high" rpms. Thanks for suggestion for 3.5 psi..TJ..I'll post what I find to see if that helps Bob (don't mean to stomp on his thread for my first post ). I've got .045s in both carbs, but found .043's in the front carb. Not sure what the PV's are...(whatever the standard Sberg kit comes with)... I'm at sea level..fwiw Lane

07-07-2011, 02:09 AM	#19
ken ct BANNED Join Date: May 2010 Location: stratford,ct Posts: 5,971	Re: Cars bogs after 45 mph. 3.5 lbs pressure is at the limit a strom will tolerate.2-2 1/2 in more like it.How can you be running .045 in both carbs and then say you have .043 in the front one???? Should be .043 in both carbs. And power valves do NOT come in any kits that i know of. Except in OLD Sorensen kits. Stock PV's usually are too big running a 2x2. most run #67-#68 in them. Your running too much gas through them your over carbed. OMO ken ct.

07-07-2011, 04:43 AM	#20
russcc Senior Member Join Date: May 2010 Posts: 2,871	Re: Cars bogs after 45 mph. If the accelerator pumps have not been modified for dual carb use, that is where I would look. The article by Barney Navarro shows how you drill a small hole in the pump setup to keep the gas level lower in the pumps so they don't give the engine to much gas. Think about it, the gas from 2 accelerator pumps when the engine originally only had pone. Too much!