question about a carb for a 170 in a 64 Falcon

[Anonymous]

I just got a holley rebuilt carb to replace my old carb and I noticed that there is a slight difference. I was wondering if any one here could tell me if it'll matter or if it's no big deal. So here's the problem: on the side of the float bowl there is a rubber diaphram with a little mechanical arm and on the old one there is one arm on each side of the float bowl and on the new one there is only one on one side of the float bowl.

 

[XFlow_Fairlane]

is this replacement carb a holley? sounds like you are describing an autolite 1100?

 

[Anonymous]

It's a rebuilt carb, but it came from Holley. So I don't know who the original manufacture was. I have to return my carb for a core. So it could be a an autolite rebuilt by Holley. I bought it from autozone and it was shipped straight from Holley, I have the box it was shipped in.

 

[Anonymous]

If the base is the same and the linkage lines up I don't believe i'd worry about it. Heck hard to say that this isn't the correct carb and the one you took off came from a flat head 6 dodge. Although i would keep an eye on the plugs for a little while to see of it is running lean or rich.

 

[Anonymous]

The carbs look idenical accept for the diaphrams on the side of the float bowl. The old carb says Ford on the side of it.

 

[CZLN6]

Howdy luckykid:

The 2nd diaphram is an antistall dishpot. This version of the 1100 was used on cars with automatic trans. The standard trans engines got a carb with only one diaphram for the accelerator pump.

The question is- is your car an auto or manual trans?

Adios, David

 

[Anonymous]

It's an automatic, so I would asume that this not the correct carb and I should return for the correct, right.

 

[CZLN6]

Howdy back Luckykid:

To be absolutely correct that is true, however there alot of Auto trans cars using the manual carb with little or no problems. How correct do you want to be?

While you're at it you might want to check the inner diameter of the venturi. The correct size for a 170 is 1.1". A 200 is 1.2". Since the 170 and 200 Autolite 1100s are identical on the outside they are frequently interchanged by rebuilders. The 170 flows 150 cfm while the 200 flows 185. That is noticeable.

Adios, David

 

[Anonymous]

I'm not worried about being correct in the restoration sense, I'm worried about the motor running correct. What if anything could happen if I run a manual carb on an automatic. What exactly is the venturi, is that the top of the carb were the air enters?

 

[mustang6]

The anti-stall dashpot for the automatics was exactly that, a diaphraghm that provides a small release of fuel under quick deceleration conditions (when you take your foot off the gas real quick, like in a quick reaction braking situation). Ford found that automatic cars needed this little extra squirt of fuel under these conditions to keep the engine from stalling/dieing. Must be the extra drag put on the engine by the automatic compared to a manual trans that caused this or something.