 
Main Menu
|
|
Nevada Classics
|
|
Advertise at CC
|
|
April 2024
|
| S |
M |
T |
W |
T |
F |
S |
| |
1 |
2 |
3 |
4 |
5 |
6 |
| 7 |
8 |
9 |
10 |
11 |
12 |
13 |
| 14 |
15 |
16 |
17 |
18 |
19 |
20 |
| 21 |
22 |
23 |
24 |
25 |
26 |
27 |
| 28 |
29 |
30 |
|
|
|
|
|
|
CC Advertisers
|
|
02-05-2004, 08:44 PM
|
 |
CC Member
|
|
|
Join Date: Nov 2003
Location: debary,
FL
Cobra Make, Engine: FFR kit in the works
Posts: 52
|
|
Not Ranked
info on speed demon carbs
is a 650 cfm, vacuum secondary, electric choke, Speed Demon series, carburetor too much for a near stock 302 that im converting from EFI to carb.
__________________
LITE'EM UP
|
-
Advertising
02-05-2004, 09:18 PM
|
|
CC Member
|
|
|
Join Date: Dec 2003
Location: Ross,
OH
Cobra Make, Engine: I drive and test my customers
Posts: 79
|
|
Not Ranked
I think it will be ok. Is the car a munual shift? When installed,take the car to a chassis dyno with a wide band fuel mixture sensor, to be sure. Hope this helps.
__________________
Eric H.@ Performance Engineering
|
02-06-2004, 02:17 AM
|
 |
CC Member
|
|
|
Join Date: Aug 2002
Location: Dacula, (Atlanta),
GA
Cobra Make, Engine: Unique 427 SC, Southern Automotive 427W Stroker
Posts: 1,649
|
|
Not Ranked
Rob, the beauty of getting a BG carb is that you call the tech dept. and give them the stats on your car. They will want to know compression ratio, cam profile, CID, intake and heads, transmission type, rear end gearing etc. They will configure the appropriate carb based on that.
__________________
After a good hard ride.....oil pressure is over 50, temp is below 190, she idles and no new dents. LIFE IS GOOD!
|
02-06-2004, 04:24 AM
|
|
Senior Club Cobra Member
|
|
|
Join Date: Mar 2002
Location: Kennesaw,
Ga
Cobra Make, Engine: Old car with 6 banger
Posts: 261
|
|
Not Ranked
Rob,
I second what Tony said. Call 706-864-8544 and get the tech line. They will configure a carb to your specs. Know your gear ratio, cam profile, intake type, etc. and they will tell you what you need.
|
02-06-2004, 02:51 PM
|
|
CC Member
|
|
|
Join Date: Nov 2003
Location: debary,
FL
Cobra Make, Engine: FFR kit in the works
Posts: 52
|
|
Not Ranked
the reason i ask is i found a good deal on a used 650
__________________
LITE'EM UP
|
02-06-2004, 03:23 PM
|
|
CC Member
|
|
|
Join Date: Jun 2003
Location: Hunterdon County,,
NJ
Cobra Make, Engine: ERA 427 SC with 428 PI
Posts: 390
|
|
Not Ranked
Don't buy what you don't want just because it's cheap.
I have a Mighty Demon 750 double pumper on my 428 - used to have vacume Holley
__________________
"Is it original ?" -- " Yes! But some parts are new."
It's just easier this way.
Last edited by ERA649; 02-06-2004 at 04:02 PM..
|
02-06-2004, 07:04 PM
|
 |
Senior Club Cobra Member
|
|
|
Join Date: Jul 2001
Location: Evans,
CO
Cobra Make, Engine: NAF 289 FIA, 347 stroker with Weber 48's, building a '48 Anglia gasser, driving a '55 Chevy resto-rod
Posts: 3,119
|
|
Not Ranked
A relatively stock 302--about a 600cfm is max--I have a 289 hi-po, mild cam, rebuilt heads, and my 600 Holley on an Edlebrock performer manifold, even being re-jetted and power valved, still seems to run a bit rich--performs well but I'm always having to blip the throttle to clear it before I take off from a stop--now it may not be tweaked just right either--
Don't Buy something that will cause you grief just 'cuz the price is right--been there done that, more dollars wasted to save a few $$.
Just a FWIW.
__________________
"Breathe in... Breathe out... then move on with life. Lifes too short to sweat the small stuff"
|
02-06-2004, 07:30 PM
|
|
CC Member
|
|
|
Join Date: Jul 2002
Location: Portland, OR area,
OR
Cobra Make, Engine: Contemporary CCX33868 Sold. Just "playin' the boards now."
Posts: 634
|
|
Not Ranked
This direct from the Holley site.
How To Calculate CFM:
Engine size (CID) x maximum RPM / 3456 = CFM
CFM @ 100% volumetric efficiency
(Example: 350 CID x 6000 RPM = 2,100,000 / 3456 = 608 CFM)
Approximately 608 CFM would be required for this engine. However, most Street engines are capable of achieving only about 80% VE; a modified street engine with ported heads, headers, intake and carburetor can achieve about 85% VE; a fully modified race engine can achieve 95% or greater VE. The CFM number arrived at with this formula must be factored by this percentage.
As can be seen in the above Holley information, it doesn't take near as much carb as you think. Actually, if you run out the formula for a 289 or 302, you'll find that 500CFM is a lot closer to what will really work right with a mild engine.
I tried the big carb(600CFM) trick on my '64 El Camino with stock 283. It didn't like it at all. Nail the gas at under 3000RPM and it just bogged.
Get some compression (11:1) stiff cam (.550@.050" 108 degree lobe centers) low butt gears (3.73:1) do the head work and a 600 or 650 will probably do a decent job on a 302.
I will add the Holley part to the new FAQ forum Brent and Ron are starting.
Al
__________________
"If some is good, more is better.
And too much is just enough."
--Carroll Shelby
|
02-07-2004, 10:49 AM
|
|
CC Member
|
|
|
Join Date: Nov 2003
Location: debary,
FL
Cobra Make, Engine: FFR kit in the works
Posts: 52
|
|
Not Ranked
wow thanks for the info. thats exactly what i was looking for.
__________________
LITE'EM UP
|
02-07-2004, 03:51 PM
|
|
CC Member
|
|
|
Join Date: Jun 2001
Location: Washington DC Metro (Virginia),
VA
Cobra Make, Engine: Classic Roadsters, Tweaked 351W, T-5Z, CRII Tech Support Team.
Posts: 1,895
|
|
Not Ranked
I ran a Holley #1850 600CFM Vac Sec "Emissions" carb on a mild 302 motor, and it ran great.
Don't knee jerk, read a few posts, and trashcan the Holley for a Demon, or trashcan the EFI for a carb. Most FFR builders retain the stock EFI.
|
02-07-2004, 04:40 PM
|
 |
Senior Club Cobra Member
|
|
|
Join Date: May 2001
Location: Florence,
AL
Cobra Make, Engine: RCR GT 40 & 1966 Fairlane 390 5 speed
Posts: 4,511
|
|
Not Ranked
CARB SIZE
Prestage.com Home Page > Car Math > Engine Building Calculators > Calculate Carb Size
GO TO THIS SITE AND CALCULATE IT FOR YOURSELF.
http://www.prestage.com/Car+Math/Eng.../default.aspx:)
__________________
''Life's tough.....it's even tougher if you're stupid.'' ~ John Wayne
"Happiness Is A Belt-Fed Weapon"
life's goal should be; "to be smarter than inanimate objects"
|
02-16-2004, 11:12 AM
|
|
CC Member
|
|
|
Join Date: Feb 2004
Location: Beaverton,
Or
Cobra Make, Engine:
Posts: 38
|
|
Not Ranked
Tony is absolutely correct.....let the pros pick the correct carb for your application.
You can visit my tech articles and read more about Demon carbs at
www.4secondsflat.com
I you still have questions about what carb you need then call the BG Tech line or myself and we'll select the correct one for your application.
Don
__________________
"You Can Never Exceed the Speed Of Your Wallet"
|
02-16-2004, 03:05 PM
|
 |
Senior Club Cobra Member
|
|
|
Join Date: Mar 2002
Location: God's country,
ME
Cobra Make, Engine: Original ERA 427sc, Powered by Gessford
Posts: 2,678
|
|
Not Ranked
Don-
Good to see you over here. I just bolted up that Mighty Demon 750 and new fuel pump that you sent me last week. I dropped the power valve to a 3.5 and just bolted it on. Wow, out of the box, big difference compared to the Holley that I was running. I think I'm going to head to a chassis dyno to get it set up perfectly, but already it is much better. But you may be getting some more calls from me 
Thanks for all your help.
(Just don't let these guys know you are a mopar guy  )
Mike
* BTW, Don really does have a great website with a lot of good info on it, it is worth a read.
__________________
Replica is not a dirty word.
"If you can't be a good example, then you'll just have to be a horrible warning."
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is On
|
|
|
All times are GMT -7. The time now is 10:37 AM.
|
Linear Mode
