The Ford Barn

1928Pickuppain · 10-11-2010, 10:00 AM

So this weekend i replaced my manifold gaskit and replaced my tilson x with an original cast iorn zenith. before, i was backfireing like mad and my bowl was worped. but she ran good and had lots of power. now it seems like shes lost some power and is running rough i origionaly set the air screw to 1 1/2 terns from seated then i opend it 1/4 more to let the get it running right. it still seems a little roughf any idears?

1928Pickuppain · 10-11-2010, 04:02 PM

No body knows the proper settings for a zenith???

TinCup · 10-11-2010, 04:21 PM

With the Zenith it could be any number of things. You did not mention it but is this carb recently rebuilt? The idle settings are correct but it could debris from the tank has plugged a jet or some other blockage. I would take it apart and make sure their is no debris.

Mike V. Florida · 10-11-2010, 04:35 PM

Quote:

Originally Posted by 1928Pickuppain

No body knows the proper settings for a zenith???

Wow, only a couple of hours and your already fustrated?

Ok, take a look at this site http://www.model-a.org/

And specifically here is the idle adjustment http://www.model-a.org/idle_adjustment.html

1928Pickuppain · 10-11-2010, 08:37 PM

the carb is fresh out of origoinal box never used, and my tank is clean. any other idears

redmodelt · 10-11-2010, 09:17 PM

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How long has it been sitting in that box? Could be just as suggested, take it apart and clean all the jets. Or maybe you need to open the needle valve a bit more, not the idle adjustment.

Tom Wesenberg · 10-11-2010, 09:25 PM

What happens if you pull the choke a little while it's ideling? If it smooths out, then you are running too lean, and may have to move the float or unplug a jet. Hard to say without being there and without knowing what was done to the carb.

Mike V. Florida · 10-11-2010, 11:29 PM

90% of all fuel problems are electrical.

1928Pickuppain · 10-12-2010, 04:19 PM

Once again this carb is mint the origonal owner bout the car in 28 then bought the carb 2nd carb (for the future) well he ended up putting a tiltson on it and thats what it ran from 35 till last week that second zenith was pased down with the car till it got to me. all the jets were clear and the float was fine and the float needle and seet were smooth.

1931 flamingo · 10-12-2010, 04:26 PM

Bowl gskt bad? Vac leak? Plugged jet?
Paul in CT

Wick · 10-12-2010, 04:27 PM

Make sure the carb is wide open when the pedal is all the way on the floor.

RonC · 10-12-2010, 05:42 PM

Many "rebuilt" carbs are not properly rebuilt. Are you positive it is the carb? You said you had problems before? Possibilities are:

1. You have a problem other than the carb???
2. Your carb is clean inside so it was not correctly rebuilt
3. Your carb has been damaged since it was rebuilt maybe the float setting is off or someone ran drills or wire through the jets to see if they are clean (a NO NO).

1931 flamingo · 10-13-2010, 12:20 AM

Another thought, do you have a vac leak somewhere between manifold and w/shield wiper motor?
Paul in CT If you find fix, please let us know.

1928Pickuppain · 10-13-2010, 10:27 AM

Well i think i got it with some adjustments half tern more air 1 1/4 tern on the gav nob i dont have a vacum line to m windshild whiper put a plug in there with thread sealer and im not backfireing at all any more. This carb was never rebuilt this is the first time its been ran ever... never been installed on a car untill now. but seems like its working good now.

1931 flamingo · 10-13-2010, 06:30 PM

Glad to hear.
Paul in CT

steve s · 10-13-2010, 07:56 PM

Quote:

Originally Posted by 1928Pickuppain

Well i think i got it with some adjustments half tern more air 1 1/4 tern on the gav nob i dont have a vacum line to m windshild whiper put a plug in there with thread sealer and im not backfireing at all any more. This carb was never rebuilt this is the first time its been ran ever... never been installed on a car untill now. but seems like its working good now.

If it takes 1 1/4 turn on GAV to get good running, you probably have a vacuum leak somewhere; the motor is demanding extra fuel to balance the air that is leaking in.

Steve

RonC · 10-14-2010, 07:24 AM

Agree with Steve. Squirt carb cleaner around the manifold connection to the block or anywhere else air leaks can occur and see if the engine races up.

1928Pickuppain · 10-14-2010, 09:16 AM

I did it with WD40 nuthing changed. but she seems ok i think im going to night im going to take her for decent drive to test it out.

Stillrunners · 10-16-2010, 08:53 PM

thanks all...

10-11-2010, 10:00 AM	#1
1928Pickuppain Senior Member Join Date: May 2010 Location: Billerica, Ma Posts: 461	Zenith problems So this weekend i replaced my manifold gaskit and replaced my tilson x with an original cast iorn zenith. before, i was backfireing like mad and my bowl was worped. but she ran good and had lots of power. now it seems like shes lost some power and is running rough i origionaly set the air screw to 1 1/2 terns from seated then i opend it 1/4 more to let the get it running right. it still seems a little roughf any idears?

10-11-2010, 04:02 PM	#2
1928Pickuppain Senior Member Join Date: May 2010 Location: Billerica, Ma Posts: 461	Re: Zenith problems No body knows the proper settings for a zenith???

10-11-2010, 04:21 PM	#3
TinCup Senior Member Join Date: May 2010 Location: OKC / Tonkawa, Ok. Posts: 1,977	Re: Zenith problems With the Zenith it could be any number of things. You did not mention it but is this carb recently rebuilt? The idle settings are correct but it could debris from the tank has plugged a jet or some other blockage. I would take it apart and make sure their is no debris.

10-11-2010, 08:37 PM	#5
1928Pickuppain Senior Member Join Date: May 2010 Location: Billerica, Ma Posts: 461	Re: Zenith problems the carb is fresh out of origoinal box never used, and my tank is clean. any other idears

10-11-2010, 09:17 PM	#6
redmodelt Senior Member Join Date: May 2010 Location: Portland OR Posts: 6,340	Re: Zenith problems Sponsored Links (Register now to hide all advertisements) How long has it been sitting in that box? Could be just as suggested, take it apart and clean all the jets. Or maybe you need to open the needle valve a bit more, not the idle adjustment.

10-11-2010, 09:25 PM	#7
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	Re: Zenith problems What happens if you pull the choke a little while it's ideling? If it smooths out, then you are running too lean, and may have to move the float or unplug a jet. Hard to say without being there and without knowing what was done to the carb.

10-11-2010, 11:29 PM	#8
Mike V. Florida Senior Member Join Date: May 2010 Location: South Florida Posts: 14,054	Re: Zenith problems 90% of all fuel problems are electrical. __________________ What's right about America is that although we have a mess of problems, we have great capacity - intellect and resources - to do some thing about them. - Henry Ford II

10-12-2010, 04:19 PM	#9
1928Pickuppain Senior Member Join Date: May 2010 Location: Billerica, Ma Posts: 461	Re: Zenith problems Once again this carb is mint the origonal owner bout the car in 28 then bought the carb 2nd carb (for the future) well he ended up putting a tiltson on it and thats what it ran from 35 till last week that second zenith was pased down with the car till it got to me. all the jets were clear and the float was fine and the float needle and seet were smooth.

10-12-2010, 04:26 PM	#10
1931 flamingo Senior Member Join Date: May 2010 Location: new britain,ct 06052 Posts: 9,390	Re: Zenith problems Bowl gskt bad? Vac leak? Plugged jet? Paul in CT

10-12-2010, 04:27 PM	#11
Wick Senior Member Join Date: May 2010 Location: Gwynn's Island Va Posts: 1,386	Re: Zenith problems Make sure the carb is wide open when the pedal is all the way on the floor.

10-12-2010, 05:42 PM	#12
RonC Senior Member Join Date: May 2010 Location: Rhode Island Posts: 1,868	Re: Zenith problems Many "rebuilt" carbs are not properly rebuilt. Are you positive it is the carb? You said you had problems before? Possibilities are: 1. You have a problem other than the carb??? 2. Your carb is clean inside so it was not correctly rebuilt 3. Your carb has been damaged since it was rebuilt maybe the float setting is off or someone ran drills or wire through the jets to see if they are clean (a NO NO).

10-13-2010, 12:20 AM	#13
1931 flamingo Senior Member Join Date: May 2010 Location: new britain,ct 06052 Posts: 9,390	Re: Zenith problems Another thought, do you have a vac leak somewhere between manifold and w/shield wiper motor? Paul in CT If you find fix, please let us know.

10-13-2010, 10:27 AM	#14
1928Pickuppain Senior Member Join Date: May 2010 Location: Billerica, Ma Posts: 461	Re: Zenith problems Well i think i got it with some adjustments half tern more air 1 1/4 tern on the gav nob i dont have a vacum line to m windshild whiper put a plug in there with thread sealer and im not backfireing at all any more. This carb was never rebuilt this is the first time its been ran ever... never been installed on a car untill now. but seems like its working good now.

10-13-2010, 06:30 PM	#15
1931 flamingo Senior Member Join Date: May 2010 Location: new britain,ct 06052 Posts: 9,390	Re: Zenith problems Glad to hear. Paul in CT

10-14-2010, 07:24 AM	#17
RonC Senior Member Join Date: May 2010 Location: Rhode Island Posts: 1,868	Re: Zenith problems Agree with Steve. Squirt carb cleaner around the manifold connection to the block or anywhere else air leaks can occur and see if the engine races up.

10-14-2010, 09:16 AM	#18
1928Pickuppain Senior Member Join Date: May 2010 Location: Billerica, Ma Posts: 461	Re: Zenith problems I did it with WD40 nuthing changed. but she seems ok i think im going to night im going to take her for decent drive to test it out.

10-16-2010, 08:53 PM	#19
Stillrunners Member Join Date: May 2010 Location: Dallas Posts: 62	Re: Zenith problems thanks all...