Demon 625 Carburetor Test and Tune
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Demon 625 Carburetor Test and Tune
Produced by enginefactory.com Worlds leader in turn key muscle car engines.
Just a little clean of the Demon Carb. Pontiac 455 CID
383 Stroker Dyno Session 450hp 479 ft lbs torque!
Chevy 383 Stroker. AFR 195cc eliminator heads fully CNC ported, Mighty
Demon 750 Carb, Weiand Stealth "Air Strike" Intake Manifold, Comp Cams
Extreme Energy 284 Camshaft, Stainless Steel Roller Rockers, Bad Ass "383
Stroker" Cast Valve Covers, Cast Chevy 400 Crankshaft, Forged Speed Pro
383 pistons, Eagle I Beam Connecting Rods.
This is my first video Ive ever made, so sorry if it sucks. Had to trim it
down from 30+min long. And I didnt even get all the pulls in. Made a
total of 9 Dyno Pulls
that day, with a result of 450 hp and 479 ft lbs. On the later pulls I had
him turn the Dyno down
to read as low as possible, which is 3000 RPM. By 3k it was already making
430 ft lbs! and at 6000 was still at 412 ft lbs, VERY flat and nice torque
curve. We tried different size jets, 2 different carb spacers, and played
with the timing. Best result was out of the box jetting for the carb, and
carb right on the manifold! Lost 15 ft lbs on the low end with the carb
spacers! Was a great day at the Dyno shop, hope you guys enjoy
Slow motion video Custom Calibrated Holley Performance Carburetor.
Slow motion video of Custom Calibrated HP Hot Rod Series Holley Carburetor.
You can find Custom hand built carburetors to your specifications and more
at http://www.apsracingusa.com .
New Custom Built HP Hot Rod Series 4150 Carburetor 750 CFM
This is a Brand New Custom Built Holley Double Pump Carburetor hand
assembled by Custom Carb Builder, Ron Blanchard. After the carburetor is
built and calibrated to your spefications, it is tested on a LIVE engine to
ensure the proper function, reliability and performance. These HP
carburetors are ideal for street rods, off road racing, drag racing, and
boating applications. Performance Carb has the experience and reputation of
making more horsepower than the other
guys. So, if you want more BANG for your BUCK, This is the Carburetor to
- Base Plate has vacuum port for power brakes/transmission vacuum
- Screw-in air bleeds
- CNC Top
- All metal components
- Hi flow needle & seats
- Dog leg Boosters
- High quality components
- Non-stick gaskets
- Perfect for high performance street, race, or marine applications
- Carbs are tuned on a test engine before shipping
- All body surfaces are machined
- Performance Carb uses a Superflow 1200 Flowbench for precision balancing
& blueprinting of venturies, Booster
signals, airspeed and total CFM
- Hand built and made in the USA
Music: http://www.danosongs.com - Doninator
High performance auto race racing products
Demon Carburetors - Back at Summit Racing! Summit Racing Quick Flicks
Demon Carburetor is back at Summit Racing! The Road Demon is suggested for
a V6 or V8 engine, producing 350 HP or less. The Road carb is available in
two sizes, 625 CFM and 725 CFM. Next, we have the Speed Demon which is
available in three different sizes; 650 CFM, 750 CFM and 850 CFM. The Speed
demon is ideal for both street and strip applications. Finally, the Mighty
Demon, which is best for race applications. The Mighty Demon carb is
available in two sizes as well, 750 CFM and 850 CFM. For more information
and pricing details, click here:
78 Tahiti Panther Jet Gets a Demon
A quick ride on the Sacramento River after Installing a 750 CFM Mighty
Demon and a little modification to the Intake Grate and the Ride Plate. I
gained 10 MPH and it Leaps out of the hole. Yahoo!
The 30 Minute Street Demon Carburetor Install Challenge Video V8TV
http://www.v8tvshow.com - Demon Carburetors recently released an
advertisement suggesting you can install a new Street Demon carburetor and
have your car running properly within 30 minutes. We decided to take that
challenge, and installed a Street Demon onto V8TV fabricator John Moss's
1972 Chevy Nova. The car is powered by a 383 stroker and was suffering from
temperamental carburetor issues. The Street Demon is an all new design
that features several innovations including a leakproof main body, 625 CFM
airflow rating, small primaries with a large goggle valve vacuum secondary,
and minimal adjustment requirements. Watch the video to see if John was
able to not only install the Street Demon in the 30 minute window, but to
see what a difference this carburetor made on his Nova!
Hot Rod Outlaws : How To adjust total timing on a Chevy Camaro 70ss 383 650hp
Hot rod Outlaws: chevy 383 , 12:1 big roller cam. World product heads. 750
demon carb jetted out big time. 100-110 octane gas. 34 to 38 degree total
timing is what these motors usually like. Total timing: Plug Vacum advance.
rev to 3000 - 3500 until total timing is reached. mine is set for 36.
Thanks for viewing, Hook.
Tuning a vw solex 34 pict 3 carb on 1904cc Option 1
I couldn't find any good info on how to modify a Solex 34 Pict 3 carburetor
to run on larger engines above 1.9L. So here is what I did to make it work.
If you jet the carb right this Mod should have Low Idle Emissions (very
clean below 4500rpms)
Please note, English is not my first language so bear with me! My engine
is a 1904cc with a stock cam and 042 heads. That's 40mm intake and 35.5mm
exh, heads are ported and the intake manifold end casts are match ported.
Rockers are stock. Compression is 8.7:1. Distributor is a vacuum advance
only and its set at 8deg at idle and max vacuum advance is 42deg (Note: the
Ford V8 flat head was not the only car with a vacuum advance only
distributor!!!) I don't want to hear it!... ALSO DO NOT USE A 009
Carb is a Solex 34 Pict 3 Bocar
The restrictive 26 mm to 28mm Venturi (Depending on your carb) is removed
and none are used! The new diameter is 34mm. Now you're really going to
move some air!
These jets are a good for a 1904cc at Sea Level
Also these jets are a lot bigger because there is a lower vacuum at the
throttle area! Don't worry your not going to run rich if you're running a
1904cc to 1914cc engine! If you plan to run a bigger engine like 2180cc
you're going to need bigger jets. I would not run anything below 1904cc
without a venturi do to the lack of vacuum and above 2180cc with this carb
because a 34mm diameter throttle plate is just too small. To get the jets
to the sizes that you need, you need to drill them. Use a digital caliper
to find the right size drill bit. Does not have to be a real drill bit, any
hard wire will work! If you go too far just solder them shut and redrill
them. There are plenty of youtube videos that show you where all the jets
are, or you can look at my part2 supplemental video and also look at No
Venturi 2nd Option.
Heres a tool to resize your jets. This tool will make it very easy.
This is a cheaper drill set
You don't really need this one, but if your a perfectionist here's a link
If you jet the carb right you should end up with a normal carb with no
Idle jet is 78mm..... 85mm runs rich, 75mm runs ok but lost power below
Main jet is 165mm.... 150mm runs ok but runs lean and hot
Air jet is 60mm......... 70mm and higher increases the hesitation problem
but an engine with more ccs may be able to run with a larger air jet.
Aux jet is 42mm........ right next to the idle jet at 11 o'clock. This is
for high rpms only, close to 5k. So if you plan to rev the shit out of your
engine you might want to change this to 42mm or bigger, but will work fine
with the stock jet. My advise is leave it stock. Fine tune your Idle jet,
main jet, and air jet. With these jets I'm currently getting a personal
worst of 22mpg W/O (wide open). Personal best of 30.5mpg at 60mph driving
like an old person and 27.5mpg at 70mph! With my freeway flyer tranny. Not
bad for a big engine with a carburetor!!!! My top speed is.... ???mph. I
don't know, I chickened out at 112mph!... It wanted more!.... lol
Explanation of Why it Works:
The hose is to keep your fuel bowl as close to atmospheric pressure as
possible. Other wise the fuel will not flow in to the throttle air stream
because of the negative air pressure in the fuel bowl that's created by the
breather tube that ends at the center of the air stream (Above the choke),
which is a negative air stream area. Because the fuel in the bowl is at a
negative pressure, the fuel is actually pulling away from your jets giving
you a stumble, bog and a surging feeling when driving with out a venturi in
your carb. The venturi normally creates a larger negative air pressure at
the throttle plate that over powers the vacuum that's in the fuel bowl,
which causes fuel to get sucked into the air stream. It basically works
like an airplane wing but round. So by decreasing the vacuum in the bowl
it makes it easier for the fuel to get sucked in by your jets and into the
throttle air stream area. I hope this helps!!!....What?.... LMAO
If you run a thinner hose form the vent tube all the way through and exit
the air cleaner you should eliminate any remaining stumbles. I know it
works better because I already tried it and determined that this approach
Please Note: I'm not a mechanic or ever claim to be one. I have however
been modifing anything mechanical all my life! Use this information at your
own risk!!!...lol Please don't use a carb with an existing stumble or that
has tuning problems! But if you do, make sure you do a proper rebuild on
Carburetor Installation how to Help Video - Holley Carb DVD
Buy the "Holley Installation & Tuning" DVD
Holley Installation & Tuning DVD: Quick Start Tuning
Now that your new carb is installed, double check all the connections and
fire it up. You need to check for fuel leaks immediately. If detected, shut
the engine off and fix the problem.
If you buy a brand new Holley 4-barrel, this DVD now comes in the box with
every purchase. If you already own a Holley carburetor or would like to
learn about the internals of the all-time, most popular modular style
carburetor, this is the DVD for you.
It's the ultimate installation, tuning and troubleshooting guide for the
Holley modular style carburetor. This disc will also help tune and
troubleshoot any other brand of modular style and some one-piece style
Menus are full of bonus information and detailed animated tours of
internals and accessory kits.
Get the full DVD with all of the interactive menus, detailed animated tours
of internals and accessory kits here...
Don't forget our Basic Engine Building DVD. This video is great for people
interested in car repair, car care, and restoration. As well as hot rods,
muscle cars, performance parts, and Boosting horsepower. It can also help
you to gain knowledge for increasing fuel economy, how to lower your
emissions, and covers preventative maintenance to avoid little things like
Sample clips on our YouTube page and at our store here...
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New Transmission DVDs and a Differential Rebuilding DVD just added.
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427 Chevy Stroker with RPM Intake & AFR Heads 580+ Horsepower
This is one of our newest Small Block Chevy 427 Stroker Crate engine
designed for hood clearance issues, such as Camaro's and Corvette's.This
engine produced incredible low end torque numbers and over 580 horsepower. Build specs,
Dart SHP block, 4,125 bore, Eagle 4340 4.000 stroke crankshaft, Eagle H
beam rods, AFR 210 aluminum cylinder heads, hydraulic roller camshaft,
roller rockers, Edelbrock RPM intake and a 750 Speed Demon Carburetor. If
your in the market for a Bad A## street engine, give us a call,
1969 Chevrolet Camaro Tony Flemings Ultimate Garage reviews horsepower ripoff complaints video
Professional + beautifully built, fresh zero mile 540cid Merlin block w/
Brodix heads, 6-71 polished blower w/ fresh Demon carbs, brand new pro
built turbo 400, Fab engineering 9 rear
w/ 4 link suspension, mirror finish Tuxedo black paint w/ white stripes,
black bucket seat interior, swing out roll cage, Autometer gauges, polished
weld wheels, Hooker headers, Flowmaster Exhaust, Wilwood 4 wheel disc brakes, dual
batteries, no expense spared, easy on the street.