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Zenith Carburetor and Jet info
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Zenith Carburetor and Jet info
3~ Tudor's & 1~ Coupe
Henry Ford said,
"It's all nuts and bolts"
"Start by doing what's necessary; then do what's possible; and suddenly you are doing the impossible."
Mitch's Auto Service ctrTags: None
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Renners corner is a great place for carb parts and the best for obtaining flow tested jets. The jet sets sold by the ordinary suppliers cause the zenith to run rich. These flow tested renners jets are on the money and come with a flow spec paper with your purchase. I have rebuilt carburetors on moderns since working as a tech and we always reused the same jets with no issues. Well long story short when i got into Model A's i either reused the jets or bought the suppliers items. Trust me when i tell you putting in the Renners jets makes a world of difference and it will make you a believer also.
Do yourself a favor and also purchase the Renners fuel level gauge when you order the jets. Their gauge is real nice and sturdy, well made compared to the tool all the suppliers sell.....
IMG_7261.JPGIMG_7260.JPG3~ Tudor's & 1~ Coupe
Henry Ford said,
"It's all nuts and bolts"
"Start by doing what's necessary; then do what's possible; and suddenly you are doing the impossible."
Mitch's Auto Service ctr
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I find that setting the float level to 15/16th is optimal height (5/16th lower than the 5/8th spec) and this also prevents stalling. This is gone over in the carb rebuilding book by Rex Reheis (BUY THAT BOOK ).3~ Tudor's & 1~ Coupe
Henry Ford said,
"It's all nuts and bolts"
"Start by doing what's necessary; then do what's possible; and suddenly you are doing the impossible."
Mitch's Auto Service ctr
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Comment
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Yesterday I put out the word for the club members to donate whatever Zenith carburetor parts they had laying around unused and I would build up a Club spare for whatever.
Well, last night one of our members, Jim in Anaheim on here, said he had some parts or a carb to donate. Well, today he brought it over and I have spent the last few hours cleaning and rebuilding this total carb.
Now, the rant, I have no idea what some folk think they are doing owning a roll of Teflon tape!! Most of my time was spent picking Teflon tape from threads on the idle adjustment screw, the GAV threads, the Main Jet, the Comp jet, just to name a few spots, as well as the inlet threads. DO NOT USE TEFLON TAPE ON FUEL RELATED THREADS!!!
Rant over
I have never seen so much tape used in the assembly of a carburetor. This was way past the point of being ridiculous. Now I need a subject to donate the time on their car to test and tune the carburetor, so I will probably call a few of the members and see who is running the poorest and give them a thrill by running this carb.
Thanks to all for allowing me to let off a little steam, now back to sucking on my bloody fingers from the pick skipping off the tape!!You wana look waaay far up da road and plan yer route because the brakes are far more of a suggestion than a command!
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Fred, if you have the proper tap and parts, there are no leaks.
I am now using a carburetor on my car that had the first threads on the filter hole blown out. Now, this would not seal, so, I ran my ½-20 tap down the throat and took a ½-20 bolt by about 2in long and cut a groove down the side of the bolt from the fuel line hole to the end of the bolt, threaded it in in place of the filter with a single gasket and no leak. Now, it doesn't have a filter, but I figure between the pencil and sediment bowl my gas is strained enough to keep most of the particles from the carburetor. I would show you a picture, but I didn't take any and it isn't leaking so I don't wish to take it apart to show you. I hope you can get a mental picture. If a carburetor has a leak, I fix it, not patch it or goo it.
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I know there are many ways to paint a carb but i use this plastikote lacquer rattle can code # T-3 Hot Rod black
It's fuel resistant..
I have a few carbs that i plan on rebuilding soon and the plan is to powder coat them.
SEE THIS UPDATE
https://www.vintagefordforum.com/for...ack#post224696You do not have permission to view this gallery.
This gallery has 1 photos.3~ Tudor's & 1~ Coupe
Henry Ford said,
"It's all nuts and bolts"
"Start by doing what's necessary; then do what's possible; and suddenly you are doing the impossible."
Mitch's Auto Service ctr
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Powder coat would be cool. This is a topic that really interests me. I printed off the pdf"s you linked above and ordered a couple of the Zenith books. I plan on looking for a couple good cores to rebuild and detail. I got a spare Tillotson with the roadster, wrapped up in a rag and bagged up in the tool box.
Is anyone running the K&N filter on their carbs? Seems like a filter would be a nice thing to have. I read they run rich unless the jets setup for a filter?
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They did not come with filters and all they had back then was dirt roads. I think Henry would have wanted his cars to last and would have had a filter if he thought it was needed.
Any of the carburetors made for back then were made to run unfiltered, so if you decide to use one now, I highly recommend the K&N filter as it will allow more air flow and I think the carburetor would only lean out a bit.
Personally, I do not run any filter on the carburetor since we have paved roads that only pick up tire rubber for dust. I know this because I used to work at a place that was within 100ft of a popular freeway and we had that dust everywhere.
Now, I DO run an oil filter because I don't plan to change oil every 500mi.
My opinion and I'm sticking to it!You wana look waaay far up da road and plan yer route because the brakes are far more of a suggestion than a command!
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Carb balancing
An easy way to air balance a carburetor without modifying it's original structure is to get a small piece of metal tube to fit tightly into the float bowl vent. I once used a brass tube about 3/4 to an 1" long. Slide a piece of tubing onto it and place the other end between the air filter and the choke plate, preferably fitting it into the air cleaner housing so you don't need to modify the carb.
If you use a large enough air filter element balancing may not be necessary.
3~ Tudor's & 1~ Coupe
Henry Ford said,
"It's all nuts and bolts"
"Start by doing what's necessary; then do what's possible; and suddenly you are doing the impossible."
Mitch's Auto Service ctr
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If you need to clean up the seats at the sediment bulb or the carb to seal the fuel line connection better purchase this Dremel # 911
from Amazon or such.
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This gallery has 1 photos.3~ Tudor's & 1~ Coupe
Henry Ford said,
"It's all nuts and bolts"
"Start by doing what's necessary; then do what's possible; and suddenly you are doing the impossible."
Mitch's Auto Service ctr
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Comment
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I picked up a couple zenith cores to play around with and rebuild. I also ordered a couple rebuild kits from David along with his jets. I am looking forward to building these up. I may try the balance tip Mitch shared. I am thinking of snagging one of the K&N filters.
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3~ Tudor's & 1~ Coupe
Henry Ford said,
"It's all nuts and bolts"
"Start by doing what's necessary; then do what's possible; and suddenly you are doing the impossible."
Mitch's Auto Service ctr
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Comment
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Well I have a Maze filter on my Zenith carb in my Tudor and I can cruise at 50 miles per hour with 4 adult passengers with ease. Carb I rebuilt myself for the first time. No mods to carb or filter.
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Originally posted by Ronald View PostWell I have a Maze filter on my Zenith carb in my Tudor and I can cruise at 50 miles per hour with 4 adult passengers with ease. Carb I rebuilt myself for the first time. No mods to carb or filter.
Glad to hear that your A is running good. Don’t mess with success3~ Tudor's & 1~ Coupe
Henry Ford said,
"It's all nuts and bolts"
"Start by doing what's necessary; then do what's possible; and suddenly you are doing the impossible."
Mitch's Auto Service ctr
- Top
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Comment
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From Renner's Corner!
ALL of the carburetors released by Ford for use on a Model A or B
had the float bowls EXTERNALLY vented.
So the use of an air cleaner of any type will negatively affect the air to fuel ratios.
These carbs were not designed for air cleaner use.
To allow the use of an air cleaner the bowl vent must be relocated to the INSIDE
of the carburetor near the choke plate area.
This is called pressure balancing.
3~ Tudor's & 1~ Coupe
Henry Ford said,
"It's all nuts and bolts"
"Start by doing what's necessary; then do what's possible; and suddenly you are doing the impossible."
Mitch's Auto Service ctr
- Top
- Bottom
- Likes 1
Comment
-
3~ Tudor's & 1~ Coupe
Henry Ford said,
"It's all nuts and bolts"
"Start by doing what's necessary; then do what's possible; and suddenly you are doing the impossible."
Mitch's Auto Service ctr
- Top
- Bottom
Comment
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The zenith on my 28 Tudor tends to weep fuel when sitting for a time, even with the fuel shut off closed. I have adjusted the float as close to 5/8 as I can and have even put 2 washers under the float valve but it still tends to weep. Car runs great on the road and idles good. Any ideas??????
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Originally posted by Mule Driver View PostThe zenith on my 28 Tudor tends to weep fuel when sitting for a time, even with the fuel shut off closed. I have adjusted the float as close to 5/8 as I can and have even put 2 washers under the float valve but it still tends to weep. Car runs great on the road and idles good. Any ideas??????
Make sure your float is not worn as shown above3~ Tudor's & 1~ Coupe
Henry Ford said,
"It's all nuts and bolts"
"Start by doing what's necessary; then do what's possible; and suddenly you are doing the impossible."
Mitch's Auto Service ctr
- Top
- Bottom
Comment
-
Mule Driver, take the second gasket out from the float needle. I have found that a second gasket tends to weep between the gaskets.
If you can adjust the float to get that level with the top, you should be good to go.You wana look waaay far up da road and plan yer route because the brakes are far more of a suggestion than a command!
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Related Topics
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by MontanaRedNeed some opinions, Took my carb off today and this is what I found under the bowl, bowl doesn't have any holes in it and all the valves seem in good working order but that rust corrosion is pretty bad, also there is a small hole at 11oclock on the first picture it appears to be a machined hole, is it suppose to be there? Float has some dents in it also. Soaking it in evapo-rust overnight now. So...You do not have permission to view this gallery.
This gallery has 3 photos.-
Channel: Model T Forum
10-12-2018, 05:25 PM -
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by Dan PartainMitch, do we have a reproduction "Wall of Shame?" If so, these belong on it.
I was going through my spare jets today and came across these old repro's from days gone by. I think the vendors are doing much better these days. An original cap jet, a repro cap jet, and 4 repro main jets.
(Posted also to the Repo parts problems and fixes pages).
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Channel: Model A Forum
04-21-2023, 07:39 PM -
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Here's a picture of a Rayfield carb that survived the fire.
I don't recall any mention of this carb before, and I've never used it, so I don't know if it's any better or worse than the original carb.
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Channel: Model A Forum
09-05-2021, 09:37 PM -
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by JackcI am installing Renner's jets into my Zenith. When looking at the main and cap jets installed, the tops of the jets are not even close to being the same height.
According to the "red book", they should be even across them and sitting in the smallest part of the venturi. It also says to use washers to adjust them, this would need a lot if washers to get it anywhere close. Is there...-
Channel: Model A Forum
11-30-2019, 03:31 PM -
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by canadianJust received a Renners kit, and float gauge, lots of info from Renners , just wondering what Tips and secrets the Forum Followers have to offer? thanks. So I just spent the best $100 CDN on my 29 Model A, A very noticeable difference using Renners flow tested jets. Clearly idling smoother and Mid to Full throttle difference . And in my opinion a DIY project if you have Mid Range Mechanical skills...
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Channel: Model A Forum
04-22-2019, 02:59 PM -
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by MitchIt seems i am always pulling a page through the binder ring so i keep these handy which makes them much more durable...You do not have permission to view this gallery.
This gallery has 1 photos.-
Channel: Model A Fine Point & Authenticity
09-30-2017, 12:37 PM -
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Can anyone help me figure this out......it's all Greek to me
:
.......and trying to read the parts book is also Greek to me:
Note the parts book...-
Channel: Model A Forum
07-24-2020, 01:45 AM -
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by Bill GYesterday, being Thanksgiving in the US, I sort of got a little carried away with feeling thankful for just about everything. Health being one of them. A dear friend of ours is in rehab after suffering a heart attack, and I feel rather lucky, even with the aches and pains that go along with getting older.
Two and a half years ago I bought a Model A. It is something my wife and I have...-
Channel: Model A Forum
11-29-2019, 01:32 PM -
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Channel: Tune-up ~ Performance
11-23-2018, 07:25 AM -
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