Recent content by RENNERS CORNER

When you take your Model A manifold to most machine shops and tell them you want the center hole opened up they're going to indicate and line up on the center hole. You'll see in the pictures below that the center hole is a cast hole and is never in line with the bolt holes because of core float...

This unit is great, it has its own power source and it's a one wire clip hook up to the coil to distributor high tension lead wire.... super easy !

Hello Steve, Yesterday morning, I was emailed a request for a Zenith passage drawing. I sent the person requesting the drawing my entire email about checking passages in the model A and B Zenith that my dad and I came up with to methodically check all the passages with air. The diagrams of...

Typical to have the inner venturi, the outer swells and breaks in half. You could notch a single venturi to fit the original inner piece, the problem is that the single venturi is smaller I.D. than the double venturi, you will have to open up the entire shape of the single to work properly. OR...

Re: Zenith Idle Mix Screw Doesn’t Kill Engine

Seems kind of odd to doubt the function and design of this engine after 98 years of proving itself ? I like to investigate and learn, but I'm hesitant to challenge that Ford Motor Co. didn't know what they were doing and by now we would have discovered the flaws if any.

From the Ford drawing !!! Were are people coming up with some of this stuff they are posting ????

Target 450 rpm 350 rpm is to low and engine can't recover when it dips down returning to idle. 550-600 rpm to fast and idle circuit is over come by the high speed circuit. I never work on any early Ford without my EZ-TACH tachometer. One wire hookup, internal battery. It tells the story, no...

Re: Zenith Idle Mix Screw Doesn’t Kill Engine A few notes on the subject of stalling while stopping with the Model A Zenith carburetor. There is a lot of useless folklore, wives tales and YouTube nonsense out there concerning this topic !! Some examples of this nonsense: - Fuel slosh causes...

I'm rolling my eyes at the speculation on what's up with this book. My dad and I were in on the original and are still involved with this book. I'm suggesting that people be patient and not do illegal copying, that's a big negative on the hobby. David Renner

Do people really think that Ford/Zenith just changed this venturi and missed or didn't care that the single venturi blocked flow ????? Airflow is notorious for acting in ways that defy common sense. You are only guessing that the bit hanging down has negative impacts. I have been testing...

The right sized roll pin goes right in, I push them in using a bench vice or arbor press not a hammer. The hole in the shaft and collar are the same, some of the pins were tapered and of coarse peening the end results in being able to drive it out only one way. When I'm test fitting to set the...

The GAV spring and washer are a tensioning device to keep the needle from moving while driving. All carburetor adjustments have some sort of tensioning method. The A and B Zenith are basically the same design and function. The major differences are the bore size and the addition of the power...

Everything matters.... how much is the question. Distributor end play should be .006" to .010" That's pretty standard for shafts where thermal expansion happens. I have distributor shim .015" .025" .032" .047" You can always turn the collar shorter to fine tune the end play. I recommend a spring...

How was the turnout ??? David