The source of the odd noise...

[Anonymous]

I was touching and feeling everything today to see if i could isolate the strange sucking rattling noise I'd been hearing. It was not the float. I was suspecting a vacuum leak, but couldn't isolate the sound.

I found it. Two holes on the base of the flange one is threaded one is not. Anyone know what they do on a Autolite 2100 and can I do anything about them?

Here is a pic of them:

Here is the noise...


Thanks for any tips in advance. Sorry about the large size...I just starting working photobucket todayand am still experimenting.

Steve-O

 

[Shrinkdude]

Mine has a bracket where the spring hooked to it and where the solenoid was. I guess you can just plug them up since you made a bracket.

 

[Anonymous]

I think I'll check my gasket and/or replace it...maybe I it didn't seal along the bottom of the carb to flange.

 

[Anonymous]

Looks like the base structural flanges that run along the bottom of the carb were well worn. perhaps from one too many media blastings during a rebuild.

In the picture below, I had my vacuum leak in the upper right corner (not my carb in pic). It was sucking in along the flange and in the two holes you can see.

I used some epoxy steel to fil in the corner between thebrackets to provide for a better seal to the adpater in that area.

I'll test run it tomorrow and see how it worked. If it's still leaking, I'm going to the Holley 2300 350 cfm -7448 carb.

To add insult to injury I got a drop base air filter from Summit today. Put it on the autolite to test fit. It hits the hood. WTF? How the heck do you get an air filter to fit the damn carb???

Steve-O