Demon Versus Quick Fuel
#999930
05/25/11 11:27 PM
05/25/11 11:27 PM
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Joined: Dec 2007
Posts: 232
Alberta Canada
PossessedDuster
OP
enthusiast
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OP
enthusiast
Joined: Dec 2007
Posts: 232
Alberta Canada
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I tested a 750 Mighty Demon on my 340 in place of the 650 speed demon it currently runs. The mid range and top end where awesome and the idle quality was atually much better. The engine shop can get me a 650 Mighty Demon -all he says I need- or they also deal with Quick Fuel but he wont recomend the Quick Fuel because I haven't tested it. I like the idea of a choke but its not a deal breaker. Which way would you go? Car specs below. Stock J Heads 2.02 intake 1.60 exhaust and Crane Gold 1.5 ratio rocker arms. 3.55 gears and a 727 with 3000 stall from SMR, stage 2 shift kit from transgo. It runs a Hughes cam #heh2328al 111deg lobe seperation/installed centerline 108deg intake lift .506/ exhaust .524 Duration@.050 Intake223deg/ Exhaust 228deg Cam timing @ .050” Tappet Lift Intake Opens: 3.5 Deg BTC Exhaust Opens: 48 Deg BBC Intake Closes: 39.5 Deg ABC Exhaust Closes: 0 Deg ATC Engine is .060 over with Keith Black Hypereutectic pistons on stock rods and a stock forged crank. Ignition is an FBO box
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Re: Demon Versus Quick Fuel
[Re: PossessedDuster]
#999931
05/25/11 11:29 PM
05/25/11 11:29 PM
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Joined: Jan 2003
Posts: 20,158
Park Forest, IL
slantzilla
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 20,158
Park Forest, IL
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Since Barry Grant folded up I'd stay away from anything he sold.
650 is not enough for a decent 340 either.
"Everybody funny, now you funny too."
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Re: Demon Versus Quick Fuel
[Re: PossessedDuster]
#999932
05/26/11 01:19 AM
05/26/11 01:19 AM
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Joined: Nov 2008
Posts: 72
Pgh, PA
Nino
member
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member
Joined: Nov 2008
Posts: 72
Pgh, PA
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I just picked up a Quick Fuel 830cfm from their SS (Street Series) line for the 440 in my Coronet. I'm pretty pleased with it -- No dyno time, and I haven't driven it much yet (still finishing it up), but it runs strong so far...
I had planned on getting a Demon, but then was turned on to Quick Fuel when Barry Grant folded. Everyone I asked who had one said they were good, so I went with it...
1970 Dodge Coronet
1968 Barracuda FB
1970 Duster
1974 Dart
1977 Dodge Custom Van
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Re: Demon Versus Quick Fuel
[Re: Nino]
#999933
05/26/11 01:29 AM
05/26/11 01:29 AM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
master
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master
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
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A Mighty is not the right carb for your app.  Most likely your idle/cruise will be pig fat...The mightys are designed for alot more cam than what you have. I have a 825 mighty on a mild 440, cam has 20 more degrees at .050 than what you have. It was pig fat at cruise with stock jetting. In the mid 10s on a AFR gauge. Ive had to go smaller on IFRs and bigger on IABs and it is still fat at cruise, but getting better.
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: Demon Versus Quick Fuel
[Re: PossessedDuster]
#999934
05/26/11 06:59 AM
05/26/11 06:59 AM
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Joined: May 2004
Posts: 12,383
Taxes & Virus's R-US, NY
Dragula
I Live Here
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I Live Here
Joined: May 2004
Posts: 12,383
Taxes & Virus's R-US, NY
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Quote:
I tested a 750 Mighty Demon on my 340 in place of the 650 speed demon it currently runs. The mid range and top end where awesome and the idle quality was atually much better.
The engine shop can get me a 650 Mighty Demon -all he says I need- or they also deal with Quick Fuel but he wont recomend the Quick Fuel because I haven't tested it. I like the idea of a choke but its not a deal breaker.
Which way would you go?
Car specs below.
Stock J Heads 2.02 intake 1.60 exhaust and Crane Gold 1.5 ratio rocker arms.
3.55 gears and a 727 with 3000 stall from SMR, stage 2 shift kit from transgo.
It runs a Hughes cam #heh2328al
111deg lobe seperation/installed centerline 108deg
intake lift .506/ exhaust .524
[Email]Duration@.050[/Email] Intake223deg/ Exhaust 228deg
Cam timing @ .050” Tappet Lift
Intake Opens: 3.5 Deg BTC
Exhaust Opens: 48 Deg BBC
Intake Closes: 39.5 Deg ABC
Exhaust Closes: 0 Deg ATC
Engine is .060 over with Keith Black Hypereutectic pistons on stock rods and a stock forged crank.
Ignition is an FBO box
With that convertor and gears, I would go with the annular QF, and with the 340, they like 750's...I have one for sale if interested I ran on my 360, and it was awesome. Very similar set-up to yours....An annular carb is more responsive and acts like a carb that is 200cfm smaller than it actually is.
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Re: Demon Versus Quick Fuel
[Re: Dragula]
#999935
05/26/11 07:40 AM
05/26/11 07:40 AM
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Joined: Jan 2003
Posts: 5,443
Indiana
YO7_A66
master
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master
Joined: Jan 2003
Posts: 5,443
Indiana
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I ran a 650 Speed Demon DP on my 340 about four years ago. It was a nice carb but I wanted something with more adjustablility and an electric choke.
For the last three years, I now run the Quick Fuel Super Street 750 Annular DP (#SS-750-AN: 735cfm is actual rating per QF). It comes with the electric choke, adjustable secondary linkage, replaceable: air bleeds, idle feed restricters, and pvcr's. These adjustable features sure helped me dial it in when using an O2 sensor for tuning.
It is a very nice running carb and I would definately recommend it on a mild built 340. Like Drag said, it is very responsive on the street.
Note:
QF makes allot of their own carb parts and they are usually cheaper than Summit (Air Bleeds: $5.26/pair, IFR's: $5.52, Main Jets: $4.89, High Flow PV (QF standard equipment): $6.32)
Note2:
When I called QF with my car combo, I asked for the SS-650-AN and they told me that since the annular booster takes away 15cfm, they suggested that I try the SS-750-AN instead. The tech thought that the 650 would be too small for my setup.
1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)
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Re: Demon Versus Quick Fuel
[Re: PossessedDuster]
#999938
05/26/11 08:53 PM
05/26/11 08:53 PM
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Joined: Jan 2003
Posts: 5,443
Indiana
YO7_A66
master
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master
Joined: Jan 2003
Posts: 5,443
Indiana
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My QF annular cruises in the mid 14's at cruising speeds (2700-3200rpms) and then goes to 12.5 A/F from a cruise to WOT. Then it leans out to 13.0 by the time it gets to my 5700rpm shift point.
I wonder what kind of rpms they see the annular getting rich. Maybe it is higher up in the rpm range than what I shift.
What is weird is that Zack (QF rep) recommended to me the annular DP because it was more responsive on the street. I am very pleased with his advice.
1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)
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Re: Demon Versus Quick Fuel
[Re: PossessedDuster]
#999941
05/27/11 07:51 AM
05/27/11 07:51 AM
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Joined: Jan 2003
Posts: 5,443
Indiana
YO7_A66
master
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master
Joined: Jan 2003
Posts: 5,443
Indiana
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""Do you think they helped much for the bottom end response and torque the website mentions?""
I have used a handfull of carbs on this 340 (Edy 600, Edy 750, 650 Speed Demon DP, the same Demon modified with Proform main body and Proform metering plates, and a Promax street/strip 650 vacuum secondary). The annular DP gives me the best overall performance of any of these previous carbs. But,,,,, it came stock very rich and it was a dog when I first got it three years ago. I've tuned it and it quickly became the best carb that I have used so far. Then recently I started tuning it with an O2 sensor and the carb is more reactive than before. My fuel curve is now correct and I think that it is an excellent street carb for my setup. If you order thru QF, then you can have a choice of the anodize color on the outside of the carb (metering blocks and base plate). I chose to have them do mine in black.
1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)
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Re: Demon Versus Quick Fuel
[Re: PossessedDuster]
#999942
05/27/11 08:17 AM
05/27/11 08:17 AM
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Joined: May 2004
Posts: 12,383
Taxes & Virus's R-US, NY
Dragula
I Live Here
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I Live Here
Joined: May 2004
Posts: 12,383
Taxes & Virus's R-US, NY
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Quote:
Called the Quick Fuel techline and they recomended a 650 SS Double pumper. I asked about the version with annular boosters and he didn't recomend them on the street as they go rich in the top end.
Any experiences?
I have back to back time slips with the annular 750 on my 360 to the 1000cfm FAST efi, and the carb had slightly higher mph by .35mph to the efi...That should tell you somthing right there.
Annular gives you a fantastic low end on a big carb, and the cfm of the big carb gives you the top end. Now if you go with a smallish 650, you don't want the annular, as the boosters take up enough room to really call it a 550...The boosters are big, that's why they are so responsive at low end. And mine is a chokeless race carb I drove on the street back and forth to work on all the nice days, and to TNT once a week. Fires up awesome and drivability was really good. 
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Re: Demon Versus Quick Fuel
[Re: Dragula]
#999943
05/27/11 08:23 AM
05/27/11 08:23 AM
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Joined: Jan 2003
Posts: 5,443
Indiana
YO7_A66
master
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master
Joined: Jan 2003
Posts: 5,443
Indiana
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""Now if you go with a smallish 650, you don't want the annular"" Drag, That reminds me that Zac told me that when he recommended the 750 over the 650, he said that the 750 with annulars would be just as responsive as the 650. Plus the 750 would give me a little bit of room for any mods in the future. Now that I thought about it, Zac did not want to sell me the 650 annular when I asked for it.
Last edited by YO7_A66; 05/27/11 09:15 AM.
1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)
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Re: Demon Versus Quick Fuel
[Re: PossessedDuster]
#999946
05/27/11 07:55 PM
05/27/11 07:55 PM
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Joined: May 2004
Posts: 12,383
Taxes & Virus's R-US, NY
Dragula
I Live Here
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I Live Here
Joined: May 2004
Posts: 12,383
Taxes & Virus's R-US, NY
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Quote:
So for my car would the 750 with annular boosters be overkill?
I know it really likeed that 750 Mighty Demon mid range and top end it pulled much harder, the bottom end was no better or worse then the 650. Both the engine shop and Quick Fuel are recomending I go no bigger then the 650 however.
So it seems as the choices sit at 650 SS Double pumper no annular boosters or step up to the 750 with the annular boosters
The 750 with annulars just plain works better than any other carb I have ever had.
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Re: Demon Versus Quick Fuel
[Re: PossessedDuster]
#999948
05/31/11 06:29 PM
05/31/11 06:29 PM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
master
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master
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
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Call Dwayne Porter and get his advice....
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Good to know after I choose my carb
