DEMON
850 CFM SPEED DEMON CARBURETOR
Mechanical Secondaries Down Leg
Part # SPD-850-MS
The next generation of Speed Demon™ carburetors have arrived. The new aluminum Speed Demon™ series is the most formidable performance street carburetor available today and it’s 40% lighter than the original. It features the most advanced design manufacturing processes that provides street enthusiasts with racing carburetor technology in a very drivable package. The Speed Demon™ line offers a wide range of sizes with vacuum and mechanical secondary designs. Across the range of sizes, from 650 cfm to 850 cfm, the Speed Demons deliver balanced, high-velocity airflow and exceptional fuel metering capacity to match the fuel requirements most street engines. A Speed Demon™ carburetor is ideal for muscle cars, stock rebuilds, mild performance applications, and crate motors. They are designed for mild engines from 302-427 cid with cam profiles between 220 and 240 degrees duration at 0.050″.
Features:
- All aluminum polished construction with billet metering blocks and base plate (Now 40% lighter than the original Demons!)
- Fuel bowls and main body have been redesigned for a sleeker, more stylish appearance
- Completely re-engineered and re-calibrated for better drivability and full throttle performance
- Re-designed throttle lever with integrated Ford A/T, 700-R4, and Chrysler kick down options
- Fuel bowls now have dual threaded inlets on each side, dual sight glass windows, and internal baffling for improved fuel slosh control
- Changeable idle, high-speed air bleeds & power valve restrictions for precise tuning
- Billet Baseplate with Idle-Eze™ allows precision fine tuning of the idle speed resulting in a smoother transition from off-idle
- New simple part numbering system: Start with SPD (Speed Demon) Add the carburetor cfm size (650, 750, or 850) and then add the model suffix; MS (Mechanical Secondaries); VS (Vacuum Secondaries); AN (Annular Discharge Boosters)
| Barrels | 4 |
|---|---|
| Billet Color | Shiny |
| Booster | Down Leg |
| Brand | Demon |
| Carburetor Use | Performance and Race |
| CFM | 850 |
| Choke | Electric |
| Circuit | 2 |
| Condition | New |
| Emission Code | 3 |
| Finish | Shiny |
| Fuel | Gasoline |
| Fuel Inlet | Dual |
| Fuel System | Carbureted |
| High Speed Air Bleed | 31 |
| Idle Air Bleed Size | 70 |
| Marine Use | No |
| Material | Aluminum |
| Model | Speed Demon |
| Primary Main Jet | 70 |
| Primary Power Valve | 6.5 |
| Primary Pump Nozzle Size | 31;31 |
| Product Type | Carburetor |
| Secondaries | Mechanical |
| Secondary Main Jet | 76 |
| Supercharged Application | No |
| Throttle Bore | 1.688 inch |
| Warranty | Limited 90 Day |
| UPC | 792898400979 |
| Part Number | SPD-850-MS |
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