Demon Ordered! (was: Slight hesitation, and choke problems)

[Anonymous]

Hi there,

I've been searching through posts looking for answers while waiting on my account to be activated, didn't see any clear cut ones for my situation:

I have a 69 Mustang with 250, Clifford headers (purchased nearly 20 years ago), Ignitor II and Flamethrower coil, and I'm getting 20 MPG (mixed driving). It's tough getting the automatic choke set just right, and I also think my stock 1V carb is on its last legs (has been rebuilt before). I'm thinking of getting a 2V carb, using Clifford's adapter plate, but there are lots to pick from. Looks like a Weber 38-38 or 32-36 are popular, but kinda expensive for me. Has anyone used an Autolite 2150? I *think* I saw somewhere that this one has electric choke, and a fast-idle solenoid (thinking when I put A/C in, this might be good). But I don't want to hurt my mileage (would like it even higher, if possible).

But then again, when my car is good and warm and the carb doesn't seem to be acting up the car runs pretty strong to me (for a daily driver, anyway), so I could just order a remanufactured carb (summit racing has them), and this would be a pretty cheap option.

Decisions, decisions........

Any help/advice would be GREATLY appreciated!!!

James

 

[pedal2themetal45]

Not sure what you prob realy is but going to the 2v will most likely hurt gas milage. maybe the 32-36 would be Ok if you want to go that way... Putting A/C on it is going to hurt Gas milage as well. If you do put A/C on it you may want to go with the 32/36 or nother type of progressave 2v carb to help you keep the power you going to lose when you run the A/C.
Just my .o2 to get the post started.
Tim

 

[CZLN6]

Howdy Back James:

An welcome to the inline adventure channel.

I would not reccommend the Autolite 2150 as they have several features that complicate thinges a little. The earlier 2100s are much easier to get right. A 1.21 should be about right for your application. They are commonly found on 351 V8 in the recycle yard. A rebuild kit is readily available, but jets are a little difficult to find. Pluses for the 2100s are annular discharge venturi boosters, simplier construction and better bowl venting.

I'd also suggest a Holley series 2100 in a 350 size. The list # is 7448. It is rated at 350 cfm, about the same as the Autolite 1.21. These carbs are available new and rebuilt, and parts are everywhere. Any of the parts for the 4150/60 will work on the #7448. Setting the float level is done externally and easily.

Jetted and tuned correctly you will get the same mileage as before- that is if you drive it the same. You will enjoy the extra power and may enjoy it too often, causing mileage to go away.

Keep us posted on your plan.

Adios, David

 

[Anonymous]

Thanks much, Tim and David. I think I found part of my problems today - the two screws that hold the vacuum diaphragm on the distributor were loose, so I tightened those, and then the small linkage underneath the front of the stock carb had just about slipped out of the clip on the passenger side (rod was just barely hanging on to the retainer clip). I tightened those two distributor screws and stuck the carb linkage back together. But I think I need to get a new carb real soon - the accelerator pump on the right is wet on the outside of the bladder (probably not a good thing, even though it's just a little bit).

But.....since I've spent so much already it may be a while until I get a new carb, unless I find a really good deal. On the bright side, I've got longer to make the right carb decision.

SO, follow up question - the Holley 7448's I'm finding are Series 2300...is this also easy to set up, like the 2100? And, I would want to add the electric choke kit (although it does look a little tricky to install). Is there a comparable carb that has electric choke already?

Thanks again,
James

 

[CZLN6]

Howdy back James:

In the short term, a rebuild kit for your stock 1101 is about $20, about as cheap as it gets. It may be that a rebuild and cleaning will do you good.

Installing an electric choke kit to a 2300 is about as easy as it gets. The hardest part is running a hot wire from the ignition switch so when you turn the key on the electric heater in the black cap opens the choke.

2100s with electric chokes are actually electric assist and use exhaust heat and engine vacuum to coordinate their operation. I've used such a choke without exhaust heat, and it worked fairly well. You will still need a hot wire from the ignition switch to heat the choke heater.

Adios, David

 

[Anonymous]

Thanks again, David!

OK, tried starting my current setup this morning, and it wouldn't...when I pulled off the air breather to see if the choke was setting (it wasn't), I saw a bunch of fuel around that accel. pump on the right side...so, I pulled the crappy carb off to measure the stud centers. Looks like I need the 2-3/4" adapter from Clifford. There's some type of base already on my intake, with stud centers about 3-3/8", but I don't see an adapter for that. This existing adapter has a vacuum feed off of it (think it goes to the PCV valve), so I guess I leave that alone.

Anyway, after checking prices it looks a *tad* cheaper to go with the Demon 350 CFM, because it already has the electric choke (which would add $42 to the Holley 2300 option). Any opinions on the Demon for my setup? From my searches in this forum, haven't seen anything really bad about this carb yet.

And one (hopefully last ) question on this topic - whether I go with the Holley or Demon, will I need a fast idle solenoid for acceptable performance with my AC? The Holley universal unit I found runs about $60, then I'd probably have to fabricate/mod a bracket for it (this stuff adds up, but at least it's fun, LOL).

Thanks for any more help!

Regards,
James

 

[Anonymous]

Nevermind on the Holley/Demon question....I'm sorta impulsive, and I hate seeing my Stang parked in the garage not running (also didn't want to go to the trouble of rebuilding the stock carb, since I knew I wouldn't be happy with it). SO......I'm ordering the Demon 350 CFM. But that's IT for a while, if we want to eat around here.

Still wondering about a throttle solenoid for A/C, but can always add that later....

Thanks,
James