New Zenith Carb

[lenmissy]

why dont you try a tilotson there a better car then a zenith .There are easy to set zenith is hard to set most guys in canada use them len.

[steve s]

Originally Posted by gtrob2003

What settings do you guys use for all the settings on this carb? I'm trying to set everything correct, but my car is running really hot with all the 'original' carb settings. What are the float settings, idle settings and GAV setting?

THANKS!!!!

Set the idle air adjust screw like you would on a Zenith or Tillotson--midway between too much and too little.

I found that about 1/2 turn open from full-closed on the T-valve works well. Runs ok with more but is noisier and sort of surges at highway speeds.

Didn't fiddle with the float level.

Needs more choke on cold starts--need to hold it on partially choked for a bit after it catches.

Steve

[J Franklin]

You made me go to the garage but here is a shot of mine.

[steve s]

Originally Posted by J Franklin

You made me go to the garage but here is a shot of mine.

THanks! Stylistically, that would really fit in with my engine compartment.

Did you notice any reduction in carb noise?

Steve

[J Franklin]

Style-wise it doesn't look much worse than the carburetor. I like to fed my car clean air, and it does reduce intake air noise. I set the "gav" needle lean and have to let it warm up a bit before traveling. I can shift better without double clutching with this carb and don't know why. When I was young and foolish I used to shift without using the clutch, I've grown up and respect my cars age more now.

[Jason in TX]

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Mine seems less troublesome, but also a little more restrictive than an original Zenith 2. The original Zenith 2 was hard starting and cold natured though so I've got the modern zenith on again. I would recommend it for a touring car. Now I'm I interested in checking out the larger one mentioned in the previous post!

[gtrob2003]

Thanks guys, I'll give these settings a shot. I found incorrect settings on another site and I'm hoping this is what is causing my overheating. The site said 3.5 out on the GAV. Will running this rich cause overheating? Mine over heats idling in the drive for longer than 10 mins now. I'm going to test again with these settings.

[steve s]

Originally Posted by gtrob2003

Thanks guys, I'll give these settings a shot. I found incorrect settings on another site and I'm hoping this is what is causing my overheating. The site said 3.5 out on the GAV. Will running this rich cause overheating? Mine over heats idling in the drive for longer than 10 mins now. I'm going to test again with these settings.

Until a real mechanic chimes in, my understanding is that enriching the mixture normally COOLS things down--extra heat of vaporization is absorbed to vaporize the additional liquid gasoline. If your car is overheating, there are many possibilities but the carb is way way down on the list.

3.5 turns open on that enrichment T-valve would be WAY too much on my car.

Steve

[Jason in TX]

It was pretty cold this morning and I hd to open mine up almost 4 turns. These are made differently than the old ones. The same GAV rules don't apply. Test and tune to what works on your car.

[Tom Wesenberg]

If it's overheating while idling in the driveway, my first guess would be the timing is too late. Second guess is a plugged radiator.

[steve s]

Originally Posted by Chris in CT

Hi Domino, I'm afraid that I will have to really mess things up here. I am running a NEW Zenith Fuel Systems #14991 carb on my '29 roadster driver and have been for 3 years now. Its is slightly larger than the 12932 you have above, and is atmospherically balanced, meaning, among other things, that you can run a modern air cleaner on it without losing gas milage or affecting gas/air mixture, etc. The choke and throttle linkages fall into place, and will require about an hour or two to modify to use original choke rod and throttle connections. Once done, you will be able to switch between your new Zenith and original equipment in five minutes if you so desire.
The best gas milage I was able to get with the tuned up original equipment was 18.5 mpg. The milage I get with the new Zenith is 18.5 mpg. The power curve over the entire engine range is much smoother than the original, and I can't say enough about how evenly the engine runs. One drawback is that you do not get that nice little choke rod hookup I see in the picture of your 13922 - you would have to make your own, as I did on mine.
If you are planning on doing this, I recommend that you look into the model 14991.
Happy Motoring!

Chris,
Could you give us some pictures and details of your setup? Thanks!
Steve

[Bruce Lancaster]

Does anyone know any data that would clarify flow expectations of either of the carbs in this discussion?
Venturi diameter or area, displacement and use of engines like the tractors mentioned that used them as original equipment??
Sounds like one is smaller than an A carb and one bigger...?

[steve s]

Originally Posted by Bruce Lancaster

Does anyone know any data that would clarify flow expectations of either of the carbs in this discussion?
Venturi diameter or area, displacement and use of engines like the tractors mentioned that used them as original equipment??
Sounds like one is smaller than an A carb and one bigger...?

Bruce,
Here's some info.
Steve

[polkadave]

Would like to see one on an engine in a car. It looks pretty ugly in the photo.

[steve s]

Originally Posted by polkadave

Would like to see one on an engine in a car. It looks pretty ugly in the photo.

Close inspections will show numerous contenders for the "ugly" honors.

Steve

[foresthunter]

Domino - which did you go with in the end? Any recommendations?

[leadpot]

Guess I will revive this post. I have bought & installed one of these carbs and am happy with the performance. The only problem I have is the choke rod (former GAV valve) now hooked up is now too long, it is sticking out about 7" from the dash panel.

What is the best way to shorten this rod & how does this rod come apart.


Thanks Leadpot

[LSGUN]

Bump, thinking about picking up one of these myself. Anybody run into the choke rod problem as leadpot did?

[Dave in Boise]

Seems I saw in Snyders that they had some K&N cone filters with flexible rubber necks and hose clamps that would likely be pretty forgiving about putting them n different intake diameters..

[steve s]

Originally Posted by leadpot

... The only problem I have is the choke rod (former GAV valve) now hooked up is now too long, it is sticking out about 7" from the dash panel.
...

Wow, I don't understand how that is even possible. Can you show us a picture of your carb mounted? Does it look remotely like mine posted a few comments above?

Steve