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Username Post: Installing a choke on a Speed Demon carburetor        (Topic#127304)
TheBandit 
Senior Member
Posts: 832
TheBandit
Loc: Oxnard CA
Reg: 03-23-03
03-22-06 09:11 PM - Post#901608    

I have a Speed Demon 650 with mechanical secondaries. It wont idle on its own when the engine is cold, so I usually hold the throttle so the engine runs at about 1,500 rpm until it will idle on its own.

I am thinking about installing their electric choke kit. The price has dropped since he last time I looked and it's only $20 through Summit.

Is there anything strange I should expect while installing this? I have never dealt with a choke before, so any pitfalls you can steer me from would be helpful!

Thanks!
The Bandit - 1970 Nova
SB355, 9.7:1, XE274, Perf RPM Heads & Int, Demon 650DP, HEI, 1 5/8, TH400, 10" BTE
12bolt 3.73posi , Slide-A-Links, multileaf, 275/60R15 GT Qualifiers on 15x8.5 Convo Pros


 
Mike 
Senior Member
Posts: 8136

Reg: 06-30-00
Re: Installing a choke on a Speed Demon carburetor
03-22-06 11:16 PM - Post#901609    
    In response to TheBandit

Kit looks easy enough to install.
Here's the instructions:
http://www.barrygrant.com/fromBarryGrant...nstructions.pdf

 
AMOS 
Senior Member
Posts: 875

Reg: 01-23-03
Re: Installing a choke on a Speed Demon carburetor
03-23-06 05:36 AM - Post#901610    
    In response to TheBandit

The Holley choke ain't much to install. It's the fast idle linkage on the end of the throttle shaft that can be tricky.

 
TheBandit 
Senior Member
Posts: 832
TheBandit
Loc: Oxnard CA
Reg: 03-23-03
Re: Installing a choke on a Speed Demon carburetor
03-23-06 12:19 PM - Post#901611    
    In response to AMOS

Thanks for the link the the instructions. It doesn't look too tough to install, I just hope it works well. I have no idea how to adjust the fast idle or any of that jazz since this will be my first choke. The only car I've driven that had a choke I remember something about stomping the gas and it would set or reset the fast idle (can't remember which?).

I am going to use the 12V keyed source that I use for my HEI. There's no resistor in line, so I don't see why it wouldn't work for the electric choke also.

I have a drop base air cleaner. Do these typically have choke clearance issues?
The Bandit - 1970 Nova
SB355, 9.7:1, XE274, Perf RPM Heads & Int, Demon 650DP, HEI, 1 5/8, TH400, 10" BTE
12bolt 3.73posi , Slide-A-Links, multileaf, 275/60R15 GT Qualifiers on 15x8.5 Convo Pros


 
enigma57 
Senior Member
Posts: 9744
enigma57
Age: 66
Loc: Texas
Reg: 10-28-00
Re: Installing a choke on a Speed Demon carburetor
03-23-06 12:52 PM - Post#901612    
    In response to TheBandit

The old moving vans (late '50's GMC V6 gas rigs) that I drove many moons ago had two cable pulls on the dash, Clint. One marked "C" for 'choke' and another Marked "T" for 'throttle'. We never used the choke, as a couple taps on the gas pedal would prime the carb sufficiently to allow easy initial startup in cold weather. But on cold mornings when first starting the truck, we would ease out on the 'throttle' cable enough to increase idle speed until the engine reached operating temperature and would idle on its own. We were very much mindful of letting the engine warm up and reach operating temperature before releasing the 'throttle' cable and starting off as well. Installing a hand throttle control cable...... In lieu of an actual choke plate (butterfly) in the airhorn...... Might be an alternative for you. Even if the carb you are using doesn't have the airhorn milled off or the contoured openings for each barrel as do the HP Holleys and many of the Demon carbs. I will be doing this with the throttle linkage on my (4) deuce setup after removing the choke assemblies from all (4) carbs. I'll let you know how it works out.

Another thing that I've found to work very well in years past (not a substitute for the 'throttle' cable noted above, though) is to use a water heated/cooled carb base plate between carb and intake manifold on V8 engines after blocking off any exhaust heat diverted to the intake manifold (the newer production heads intended for EFI usage don't have these exhaust passages, nor do purpose-cast racing heads). Then you plumb engine coolant through the base plate by diverting a heater hose to flow through the base plate on its way from the front of the engine back to the heater core at the firewall. This provides an even temperature sufficient to help atomize fuel on cold days after engine warm up, but not hot enough to boil fuel in the carb on hot days, either. I used to pick these plates up in wrecking yards (many early '60's Fords ran them and they were available in both the 2 or 4 bbl Ford/Holley/Demon pattern. After the junk yard sources for these dried up, I began using the more expensive versions Jack Clifford made for his inline manifolds. I am not sure if Clifford still makes the separate heated carb base plates or has incorporated coolant passages into his newer manifold designs, but that would be another source for these plates if still available....... Or you can machine your own from scratch if push comes to shove.

Hope this gives you some ideas,

Harry

 
MikeB 
Senior Member
Posts: 9475
MikeB
Loc: Plano, TX
Reg: 08-28-03
Re: Installing a choke on a Speed Demon carburetor
03-23-06 01:02 PM - Post#901613    
    In response to TheBandit

Quote:

I have no idea how to adjust the fast idle or any of that jazz since this will be my first choke. The only car I've driven that had a choke I remember something about stomping the gas and it would set or reset the fast idle (can't remember which?).



You're exactly right -- stomping on the gas lets the choke linkage set the fast idle (needed when the engine is cold and the choke is closed). Not sure on a Demon, but there's probably a fast idle adjustment screw separate from the idle speed screw. Simply adjust it immediately after a cold start for a comfortable idle speed. Once the choke opens, the fast idle is no longer in play.

You can also adjust the choke (leaner or richer) so it doesn't open too soon or stay closed too long.
Real Hot Rods have a Clutch!

1955 210 2dr: 327, Brodix IK180 heads, Jones cam, M20, Wilwood front brakes

1982 C-10 SWB pickup, 250 six, 3-speed

My car pictures



 
TheBandit 
Senior Member
Posts: 832
TheBandit
Loc: Oxnard CA
Reg: 03-23-03
Re: Installing a choke on a Speed Demon carburetor
04-05-06 10:00 AM - Post#901614    
    In response to MikeB

Thanks everyone for the responses. When I get this going I will take some pictures of the install.

I called Summit to order the choke kit and apparently they recently dropped Barry Grant from their product line. The sales guy sounded bitter when I asked about it, so I didn't get any info beyond that. All the other places I've found want about twice as much for the Demon choke kit, so I'm going to have to save for a little longer.
The Bandit - 1970 Nova
SB355, 9.7:1, XE274, Perf RPM Heads & Int, Demon 650DP, HEI, 1 5/8, TH400, 10" BTE
12bolt 3.73posi , Slide-A-Links, multileaf, 275/60R15 GT Qualifiers on 15x8.5 Convo Pros


 
blackjack 
Senior Member
Posts: 342

Loc: nw indiana
Reg: 04-12-03
Re: Installing a choke on a Speed Demon carburetor
04-05-06 10:54 AM - Post#901615    
    In response to TheBandit

The clarification I received from the summit/barry grant thing is that bg pulled there items from summit because to many discrepancies in the reason for returning products. As I state this is what I received as info from a bg rep. Sometimes those choke kits are on ebay. I sold a new one a few months ago for $30 on there and there were 2 others at that time.

 
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