I recently acquired an Autolite 4100 off ebay here in the UK. It's part number is C5AF H, which I think is from an auto 390. I have read very good things about these carbs and I am keen to try it on my 351Cleveland which is fitted to an Australian Ford Falcon. The car at present has a 600cfm VS Holley. I also picked up a remanufactured square bore Autolite 4300 (which is what these engines came from from the factory).
(a) Regarding the 4100, can someone point me in the direction of a supplier of rebuild kits who would ship to the UK and take PayPal or credit card for payment ?
Also, everything seems to be present on the carb and all linkages work fine. The choke is present and operates as is should in closing and, sort of, setting the fast idle.
The main questions I have are regarding the throttle levers and the associated accelerator pump.
(b) Does the spring wrapped around the throttle shaft at the linkage hold the primary throttle plates fully closed, or does it rely upon an external spring to fully close them ? The wound spring pulls the plates almost fully closed, but there is then some free play which seems to imply another spring fully pulls them onto the idle stop.
Also, when the throttle is manually pushed to be fully closed, the lever arm for the acclerator pump does not contact the pump plunger. The throttle plates have to move a certain distance before the lever arm contacts the plunger.
(c) This seems to imply that there can be a bit of throttle opening before the accelerator pump shoots a squirt of fuel. Is this correct for a 4100 ? Most carbs I have worked with, and looking at the 4300 it is true, operate the accelerator pump as soon as the throttle shaft starts to turn ?
Being a bit on my own here, and never having seen a 4100 on another car, I have no idea what is right or wrong, so any and all help appreciated.
Thanks in adavance for any help.
Sandy Mercer
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