demon 350 cfm carb

[ludwig]

The latest HOT ROD mag mentions that Demon has a new 2bbl carb rated at 350 cfm. Would this be over carbed on a 200? Could you jet it down to where it would work? Could be a sweet look with the hood up.

 

[Anonymous]

350 cfm for a "Street Six" and a 500 cfm for a "Strip Six"

So Street/Strip 350-500 cfm 2bbl

 

[Anonymous]

350 cfm for a "Street Six" and a 500 cfm for a "Strip Six"

Agreed. Some folks run a 500 on the street, but I think if given the chance they would like the drivability of the 350 better.

The cylinder head on these engine doesn't flow enough air to take advantage of the 500's size. Even a 350 is kind of overly large.

I have yet to hear that carb is available. Do you have a part number?

 

[Anonymous]

OK, summit does not have them but Jeg's does??

Part numbers 132-2181230OT for race demon 2 bbl at $375.99

and 132-1181230E road demon, elec choke for $299.99

 

[ludwig]

Cool. How would you hook it up? Probably a purpose built mounting plate or maybe the Stovebolt type adaptor?

 

[Anonymous]

Cool. How would you hook it up? Probably a purpose built mounting plate or maybe the Stovebolt type adaptor?

Do a search for Holley 2 bbl mounting. Any place or method you see for mounting a Holley or Motorcrfat 2 bbl will also apply to the Demon carb. I like the way "mustang geezer" mounted his directly to the intake log (machined flat) and then with adapter plates.

 

[xctasy]

If you think your engine may produce more tha 150 hp, get the 500 cfm carb.

Basically, the 350 is a brilliant economy carb, with enough performance on our sixes to get past the 125 hp level. On little 2.0 and 2.3 Pinto/Capri/Mustang fours, a 350 cfm carb starts to restrict power at the 125 hp level. Past 130, a 500 cfm carbs works much better, with similar low speed charactersitics, but lots more power about 3500 rpm.

On our sixes, the 3.3 and 4.1 engins produce lots of vacuum, and can reliably run up to the 150 hp level. Check out Jimbo 65 and Marley and wsa111. These guys find there 350 cfm carbs are able for good economy, and great drivabilty, and have give no power restriction.

For the speed crazed amoung us, like Mr Mustang Geezer, he's was well over the 150 hp mark three years ago. Now his possibly into the 200 club with his 11.2:1 and 500 cfm carb.

Past 150 hp, go for a 500 cfm. There is always a small loss in economy with a 500 cfm carb, because vaccum is always reached with the carb with 40% more jet area, and the fuel doesn't atomise as well at low speeds as the 350 does. It can be set-up with low pressure power valves in the 2.0 , 2.5, and 6.5 range and adding smaller 17 thou power valve channel restrictions. Pump squirters can be fattened up, becasue the six cylinder engines intake puts lots of fuel on the walls of the log, and its better to go up than jet it up.

Oh, and if its a turbo, you can run a 350 cfm carb and still get about 300 hp. That's where Does 10's sits with his 250 six doing low 12 second quarters.

 

[Anonymous]

I have the demon 350, I used the clifford adaptor for it. Although I can't tell you how much of a difference it makes because the car is parked for now. But when it did drive, i could tell that it wasn't having any trouble breathing. beware that you will be limited on your clearance of your hood, adaptor and carb installed I only have about 2 1/2" left for an air cleaner.

 

[Lazy JW]

What are these Demon carbs like? Are they similar to a Holley? Just curious. Might be a good economy carb for a big six 8)
Joe

 

[Anonymous]

I'm pretty new to the car world myself, but I get most of my info from people I work with and they all pretty much say that demon carbs are just like holley. It looks cool with the demon logo on the back. The bolt pattern is the same as holley.

 

[Anonymous]

Max cam duration of 220° at .050.

Part # 1181230E
350 2-bbl Demon
Electric Choke

Part# 1181230M
350 2-bbl Demon
Manual Choke

Part # 1372210E
500 2-bbl Demon
Electric Choke

Part # 1372210M
500 2-bbl Demon
Manul Choke

 

[MercuryMarc]

Thanks!

Found more info on this site:

http://www.barrygrant.com/demon/default.aspx?page=5a

Marc in SF
63 Comet
69 250/C4
Dual Cupholders
http://mercurycomet.net

 

[wsa111]

I wonder if the throttle bore & venturi diameter is the same as the holley 7448-350, ditto with the 4412-500 holley???

The holley carbs 350 really flows about 247 cfm if you use 4 barrel flow standards & the 500 really flows close to 353 cfm using 4 barrel flow standards.

I guess demon uses the same standards??? William

 

[xctasy]

Twins under the skin, Will. Same 1.5" throttle and 1.1875" venturi.


They are Holley work-a-like carbs.