Re: [DML] Contemplating a Carb Swap
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Re: [DML] Contemplating a Carb Swap

If you've got an Autolite 2100 then you likely have a 289 or a 302 -- nearly twice the cubic displacement of a PRV. Could that be why your Mustang uses more fuel.... (Bigger engines use more fuel than smaller engines). And if it's a high compression V8, it uses even more fuel (expensive high octane fuel) than a low compression variant. Cheer up, it could be worse -- the high compression 460 (transplanted 1969 unit) in this 5,000 lbs luxury liner only gets 8-9 MPG: 

As you readily admit, "I almost never drive my 66 Mustang". If you still have a mechanical fuel pump, of course you had to crank the engine for an extended period of time before it started -- the bowl was empty.... What do you think operates the pump -- the rotating engine. Your tank is also remotely mounted at the other end of the car, which takes all the longer to full the bowl.

Speaking of which: if you rarely drive your Mustang, gasohol is going to kill your mechanical pump. It dries out the diaphragm and causes it to crack/split/tear/etc. Every one of my vehicles that sees occasional use has an electric pump spliced in between the mechanical pump (most ethanol damaged) and the carb:
If you're not going to drive your Mustang regularly, I highly recommend doing the same before it puts you to walking. Remember that if your mechanical pump does die while you're on the road, you can limp the car to a safe haven by filling the bowl manually. This is how I limped one of my Lincolns 10 miles all the way back to the house when its pump split:
My trucks are surviving OK, but they are driven daily. 

Personally, I recommend replacing your Autolite 2100 with a Motorcraft 2100. Ford made several improvements in the redesign that you would benefit from:
- Bigger chimneys
- Better choke pulloff (the piston in your mechanism severely limits the amount of tension you can put on the spring)
- PCV through the carb itself
Bare minimum I would replace your heat activated choke with an electric cap. Autozone sells them (I use Part #E638 myself).

There's no reason to send your carb to anyone. If you want to rebuild it yourself, I'd be happy to show you how. There's also 1,001 Internet writeups. Pick up a $13 kit next time you're at Autozone and I'll stop by your house when I go to New York later this summer.

Bill Robertson

--- In dmcnews@xxxxxxxxxxxxxxx, Marc Levy <malevy_nj@...> wrote:
> No, as I said many times before it is not a Holley. It is an Autolite that has been serviced a number of times over the years, last 2 times by (now defunct/dead) "Pony Carburetors".  At the time, they were the "authority" on them, yet it still runs like garbage and uses a ton of fuel.


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