650 Mighty Demon x 2

Hey gang,
Can I get some input on Carb selection?

351w stroked 408
12:1 Compression
Cleveland Heads 4v 61cc 2.19/ 1.71 Ferrea
252 roller cam?
forged Eagle crank
Wiseco Racing pistons
tunnelram

I was concidering (2) 650 Mighty Demons Mechanical secondaries. Any thoughts on this matter? My engine builder is recommending (2)700/750 Holleys. I talked to Barry Grant inc. And they say each carb flows more than they are labeled for, as far as Demons go. Trust me guys, I know the best performance would be a Victor/Parker and one big carb. This is also a show vehicle, so I gotta have the eye candy. So tell me what's the best two carbs to slap on top?
Thanks,

_________________
L8R,
Rick in Indy



<font size=-1>[ This Message was edited by: FATNFAST on 11/19/05 7:21am ]</font>

<font size=-1>[ This Message was edited by: FATNFAST on 11/19/05 7:39am ]</font>

I would go holley. It has always been my experience that more power is made and they are more easily tuned. I have dyno tuned many demons and many holleys and holleys are much easier and responsive they run better and with less work. I could not imagine trying to get two demons to run the same I have had issues just getting one demon to run right...... go holley they kick ass.

First off, I'd agree.......go with a Holley setup for what you have described. But I'm not sure you need to go 700-750. I'd use 2 600's probably.

Secondly.....Do you know the guys name at Demon you talked to? I'd sure like to have him answer a couple of "flow" questions for me.

I don't know if he was implying that 2 Demon 650s would flow in excess of 1300 cfm on your engine, but if he was I would totally disagree. And if they did, it would be an indication that the carbs were restricting flow and you would be leaving power on the table. Not a likely scenario, IMO for your combo.

This has to do with how the industry has rated carbs and the actual pressure drop accross the booster venturi in a given application.

Here's a link that will explain:

http://www.candsspecialties.com/ratings.html

Anyway, sounds like a fun project. Good luck! [img]/phpBB/images/smiles/icon_wink.gif[/img][img]/phpBB/images/smiles/icon_tup.gif[/img]
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Quote: "Here's a link that will explain:

http://www.candsspecialties.com/ratings.html "

Good Article! Thanks...

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Get a couple carbs that are calibrated for use on a dual 4bbl setup. Summit use to (and I believe still does) sell complete tunnel ram setups (including carbs). They should be able to hook you up with 'tunnel ram' carbs.

Else, call Bigs or some other carb tuner.
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in my opinion i would run away from any demon carb made lately as it seems to me they have no quality control there , seems like they are just making them as fast as they can.

pro-system
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Holley makes (check summit # HLY-0-4224) a Model 4160, 660cfm "center squirters", just for tunnel ram engines. Mechanical primary and secondary butterflys linked with a one-to-one ratio, and a center mounted accelerator pump nozzle shooting into the primary and secondary venturis. I think that's what N20 mike was talking about.

_________________
Talk softly and carry a big bumpstick

<font size=-1>[ This Message was edited by: bytemydust on 11/21/05 10:52pm ]</font>

<font size=-1>[ This Message was edited by: bytemydust on 11/22/05 3:05am ]</font>

I talked to Comp Cams about the two 650 Mighty Demons and the rest of my set up. Here's what they recommended for my weekend warrior /stip application: @50

Cam # 35-780-9
268/275
696 intake
672 exhaust
106 Lobe seperation

He said it would pull from 4000-7000rpm

So, What kinda Hp/Trq should I expect out of my application?
351w stroked 408
12.5:1 Compression
Cleveland Heads 4v 61cc 2.19/ 1.71 Ferrea
268/275 Solid roller cam
forged Eagle crank, Eagle H-Beam rods
Wiseco Racing pistons
tunnelram with (2) 650 Mighty Demons


_________________
L8R,
Rick in Indy



<font size=-1>[ This Message was edited by: FATNFAST on 11/22/05 6:51pm ]</font>

<font size=-1>[ This Message was edited by: FATNFAST on 11/23/05 10:14am ]</font>

Slap some big primary tube headers on it and you'll probably need to be worried about splitting the block....I say 600 - 625 FWHP 480#/ft torque. I would love to hear it scream at 7,000k!
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