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Old 09/16/2018, 10:02 PM   #16
robert campbell
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Arlie,
You are also increasing the lift and the duration of the cam in your six. This will allow and demand a bit more from the carb.

Rob

Last edited by robert campbell; 09/17/2018 at 02:59 PM..
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Old 09/18/2018, 01:03 PM   #17
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Good point; I hadn't thought of that.

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Old 09/23/2018, 02:32 PM   #18
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I found a little problem with my carb that may be causing some of its issues.
The driver's side accelerator pump leaks when it kicks in, which is odd because it's a new diaphragm. Hopefully another new diaphragm will solve the problem, but I'm not counting on it. Two other problems could be too much fuel pressure (new pump), or a stuck float. Luckily, the carb comes off by removing the fuel line and two bolts. All the linkages and other stuff are in the base plate that remains attached to the intake.
https://www.youtube.com/watch?v=nMqscULOnDk

The '68 Autolite 1100 is a little odd in that it basically has two accelerator pumps, one on each side. The one on the passenger is called an anti-stall diaphragm. It has an adjustment screw that is used to somewhat reduce the flat spot between idle and acceleration. Somewhat, not completely.

It's an incredibly simple carb. From what I've read the 1100, 2100, and 4100 are all based the same carb. Using the 2100 as a base, the 4100 is two of them stuck together, and the 1100 is one cut in half, sort of.

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Old 09/23/2018, 03:13 PM   #19
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Quote:
Originally Posted by Mosesatm View Post
I found a little problem with my carb that may be causing some of its issues.
The driver's side accelerator pump leaks when it kicks in, which is odd because it's a new diaphragm. Hopefully another new diaphragm will solve the problem, but I'm not counting on it. Two other problems could be too much fuel pressure (new pump), or a stuck float. Luckily, the carb comes off by removing the fuel line and two bolts. All the linkages and other stuff are in the base plate that remains attached to the intake.
https://www.youtube.com/watch?v=nMqscULOnDk

The '68 Autolite 1100 is a little odd in that it basically has two accelerator pumps, one on each side. The one on the passenger is called an anti-stall diaphragm. It has an adjustment screw that is used to somewhat reduce the flat spot between idle and acceleration. Somewhat, not completely.

It's an incredibly simple carb. From what I've read the 1100, 2100, and 4100 are all based the same carb. Using the 2100 as a base, the 4100 is two of them stuck together, and the 1100 is one cut in half, sort of.
Only the 1100 just dumps in the fuel, the 2100 and 4100 have annular discharge jets that better atomize the fuel. That is what makes them such great carburetors.

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Old 09/23/2018, 05:07 PM   #20
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Quote:
Originally Posted by Ruppstang View Post
Only the 1100 just dumps in the fuel, the 2100 and 4100 have annular discharge jets that better atomize the fuel. That is what makes them such great carburetors.
Yep, that's one of the things that creates the flat spot in the 1100, another reason is the distance to the outer cylinders. If the 2x1 system isn't too expensive I may go that route instead of the 2100. More research to do.

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Old 09/23/2018, 05:59 PM   #21
robert campbell
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I just rebuilt one today and put it on a 200 in a 1964 Falcon Ranchero. Your flat spot is the leak on your driver side accelerator pump or a dizzy porblem. The housing that is screwed on is warped from over tightening. You need to flattened it back out and screw it on less tightly. You can flattened it by setting it on a steel flat surface and use a flat punch on each of the four sides in the middle between the screws. There is also a finite adjustment for the passenger side diaphragm that is depended on a properly adjusted carb at hot idle that has the throttle in the full closed position.

The 1100 is a fine carb. Send it to me and I will bench it on this car or the 1968 I just finished last Spring! The one I just finished today is great. not a hint of an flat spot. Also your vacuum advance diaphragm on your dizzy can cause a flat spot if it is ruptured and non-operational.

Get that car to my garage!!

Rob
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Old 09/23/2018, 08:20 PM   #22
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The accelerator pump cover was badly warped. I flattened it the best I could and also lowered the float. It's no longer leaking. If I can't get rid of the flat spot I'll ship it to you.

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Old 09/24/2018, 04:45 AM   #23
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If you can find one of the 1100s that Pony Carbs reproduced Jon engineered them with the annular discharge. It gave them 15-20 more HP. NPD sold them.

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Old 09/24/2018, 09:02 AM   #24
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Quote:
Originally Posted by Mosesatm View Post
The accelerator pump cover was badly warped. I flattened it the best I could and also lowered the float. It's no longer leaking. If I can't get rid of the flat spot I'll ship it to you.
I had one that the accelerator pump discharge hole was plugged. Even after a chemical bath and a thorough blow down with compressed air. I had to get one of my teeny tiny screw and poke it in the hole which is no easy task.

Does it squirt gas when you open the throttle? If not it creates a huge flat spot.

Rob
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Old 09/24/2018, 01:13 PM   #25
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Iíll check later today. That could be one reason the damn thing wonít start after a few days without priming it. Iím tempted to drill a hole in the air cleaner as a priming port!!!

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Old 09/24/2018, 04:05 PM   #26
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That is exactly why you need to prime it. You get that orifice open and you will love your little six shooter! You should see and obvious squirt of gas into the venturi when you open the throttle. It must have one heck of a flat spot!!

The top of the carb comes off very easily with the choke removed. Be careful and not turn the body of the carb upside down. There are 3 check balls and one weight that will fall out!

Rob
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Old 09/25/2018, 02:12 PM   #27
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I tore apart the carb and found that the check weight was over the wrong ball. And of course it was over the accelerator pump ball. After moving the weight to the proper spot I took the car out for another spin. It's better, but since I've never owned a 200 I don't know how much hesitation is normal, if any.

I'm going to let it sit overnight and see if it will start in the morning. If it doesn't it's coming off the car and heading west to Rob.

The carb was recently rebuilt before I bought it because it is nearly spotless, just not correctly reassembled.

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Old 09/25/2018, 02:16 PM   #28
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Not a surprise on the improper assembly. Can you see a shot of fuel go down the throat when you pump it with the engine off? If not the nozzle is plugged.

After we determine this, we need to check your vacuum advance diaphragm to see if it holds a vacuum and moves the advance plate. We will also advance it a bit more by setting the advance higher by advance the initial advance.

It should not hesitate one bit!!

Rob
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Old 09/25/2018, 02:29 PM   #29
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Yes, there seems to be. Not a ton like I'd expect in a 2V.
Putting it back together I did this.
<sigh>
Oh well, it's only 8 screws.
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Old 09/25/2018, 03:16 PM   #30
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Been there done that!! Are the any tools stuck in your drywall??
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