2024 Dyno Challenge Rules
Spirit & Intent
The Spirit and Intent of this competition are to showcase the ingenuity and creativity of engine builders within small engine racing, including karts, mini bikes, and Jr Drag. The competition creates an opportunity for exposure, bragging rights, and maybe a few prizes, and promoting our respective sports for the benefit of all. It's not only a competition but a time for many of those supporting our industries to gather in one place for a bit of fun.
Date
September 28th, 2024
Host & Location
EC Carburetors is hosting the event at their Dickson, TN (West of Nashville) shop. Those participating in the event come to walk through the shop and see some behind-the-scenes work.
EC Carburetors has many hotels within 10-15 minutes, or use this time to visit Nashville, which is only 35-40 minutes away.
EC Carburetors
2950 Highway 48 South
Dickson, TN 37055
Presenter & Live Stream
Greg - Red Beard’s Garage
The event will be live-streamed; information and details for live-streaming will be announced later.
Dynos
Brad Hill of Brad Hill Performance will be using his dyno. We will set up another Hewitt dyno and calibrate it to match Brad’s. Current Classes will be tested on Brad’s Dyno and new classes on the other Hewitt Dyno. We will set up and use our big dyno for the unlimited class.
Registration
Class sign-ups will be made on the EC Website, and engines will be sent directly to us with return labels for shipping the engines back out. After registering, you’ll need to fill out a Builder Profile, and for each class, you enter an engine form. We want to showcase the builders and their engines in our live stream and post-competition blogs and videos.
Builder Profiles
- Name
- Social Media Handles
- City/State
- Club/Company
- Pro/Hobbyist
- Mini bike/go-kart/other
- Years of experience
- Specialty
- About yourself
Engine Profile
- Class
- Bore/stroke
- Compression ratio
- Carburetor
- Cylinder Head
- Valves
- Rocker arms
- Valve springs
- Retainers
- Piston
- Rod
- Crankshaft
- Flywheel/Coil
- Spark Plug
- Block
- Sidecover
- Exhaust
- Oil
- Misc
Sponsorships
Class Sponsors
Class sponsors are to donate a prize for a drawing in each class, which means you don’t need to win the class to win something. The winner of each class will receive a cash prize based on the payout.
- Unlimited/Big Block
- 310cc Open Modified
- 275cc Small Block Open
- 275cc Stock Appearing
- 14.5ci/237.6cc Open Modified
- 212cc Limited Modified
- 212cc Ghost "Super Stock"
- 223/224cc - All Cast on Gas
- 236/240cc - All Cast on Gas
Award Sponsors
Award sponsors are to donate a prize(s) for the awards below.
- Overall, Most Hp per CI
- Overall Most Tq per CI
- Hard Luck – Person with the worst performance or worst power per ci
- Farthest traveled (engine shipped or person traveled)
- Most classes won or highest average finish(must enter 2 or more classes)
Contingency Sponsors
- We encourage companies selling small engine parts to offer a contingency or bounty reward for using your products. Ideally, we ask you also to sponsor a class or an award.
Sponsor Profile
- Company/Name
- Website
- Social Media Handles
- City/State
- Years of Business
- Specialty
- New/Premier Products
- About your company
Prizes/Payouts
- Entry Fee $100 Per Class
100% payback for each class except the non-competition.
3-5 entries pay back to 1st
6-8 entries pay back down to 2nd
9-11 entries pay back down to 3rd
12-14 entries pay back down to 4th
15 entries pay back down to 5th
Rules
The 2024 Competition has expanded to include Big Blocks in the Unlimited Class.
Engine classes are designed to display the possibilities with many readily available components. We believe the class rules should be relative to our markets and racing.
- All engines must be industrial-based, 4-cycle, single-cylinder, small-block engines, either flathead or OHV(No Wankel or OHC engines).
- Small Block is classified based on the factory engine's mounting bolt pattern, 3/4" PTO. If you are unsure about an engine platform, ask us before bringing your engine.
- Big Block is based on the Honda GX390/Big Block Clones with a 1-inch PTO. Must fit GX390 mounting pattern 7.69"L x 3.375"W or Wildcat 460 mounting pattern 8.5"L x 3.5 - 4.00"W. If you are unsure about an engine platform, ask us before bringing your engine.
- No Forced Induction or Nitrous
- All Engines must have Blower Housings
Current Classes
310cc – Open Modified
Block/Crankcase
- 310cc Max Displacement
- Billet or Cast
- Billet Side Cover Allowed
Cylinder Head
- Billet or Cast
- No restrictions on modifications
Carburetor
- Single Carburetor(No Fuel Injection)
- Pure Methanol No Additives - Fuel will be provided
Ignition
- Billet Flywheels Only
- Factory-Style Ignitions Analog or PVL Digital
- No CDI or Programmable Timing Controllers
Exhaust
- No restrictions
275cc – Small Block Open – Cast Block/Head
Based on SBO(Small Block Open), Classes with a displacement restriction and cast-only regulations
Block/Crankcase
- 275cc Max Displacement
- Cast Blocks Only(No Billet)
- Billet Side Cover Allowed
Cylinder Head
- Cast Heads Only
- No restrictions on modifications
Carburetor
- Single Carburetor(No Fuel Injection)
- Pure Methanol No Additives - Fuel will be provided
Ignition
- Billet Flywheels Only
- Factory-Style Ignitions Analog or PVL Digital
- No CDI or Programmable Timing Controllers
Exhaust
- No restrictions
14.5ci or 237.6cc Modified
Based around WKA Open Classes ran at the Big O, Thanksgiving Thunder, Wayne Overton & Batesville Indoor.
Block/Crankcase
- 14.5ci or 237.6cc Max Displacement
- Billet or Cast
- Billet Side Cover Allowed
Cylinder Head
- Billet or Cast
- No restrictions on modifications
Carburetor
- Single Carburetor(No Fuel Injection)
- Pure Methanol No Additives - Fuel will be provided
Ignition
- Billet Flywheels Only
- Factory-Style Ignitions Analog or PVL Digital
- No CDI or Programmable Timing Controllers
Exhaust
- No restrictions
275cc – Stock Appearing GX200
Must Appear Stock from “5ft” away.
Block/Crankcase
- Cast Blocks Only(No Billet)
- Billet Side Cover Not Allowed
- No External Welding, Epoxy or Modifications
- Internal Modifications allowed.
Cylinder Head
- Cast Heads Only(Factory, EVO, GAGE, Shredder)
- No External Modification
- Internal Modifications allowed.
Carburetor
- GX200 Factory Carburetors(Ruixing, Keihin, Hyaui, Tillotson, SP)
- No External Welding, Epoxy or Modifications
- Internal Modifications allowed.
- Must use factory phenolic spacer
- Pure Methanol No Additives - Fuel will be provided
- No 240-500cc Big Block Carburetors
Ignition
- Billet Flywheel Only
- Factory-Style Ignitions Analog or PVL Digital
- No CDI or Programmable Timing Controllers
Exhaust
- No restrictions
New Classes
Unlimited/Big Block
For engines over 310cc, either small block or big block
Block/Crankcase
Small Block or big block-based Engines
Cylinder Head
- Billet or Cast
- No restrictions on modifications
Carburetor
- Single Carburetor(No Fuel Injection)
- Pure Methanol No Additives - Fuel will be provided
Ignition
- Billet Flywheels Only
- Factory-Style Ignitions Analog or PVL Digital
- No CDI or Programmable Timing Controllers
Exhaust
- No restrictions
212cc EC/Welch Limited Modified
- Find the complete rules here: https://www.eccarburetors.com/212-limited-modified-rules-karting
Ghost 212 “Super Stock”
Engine Must Pull Start, Rev Limited to 6200rpms
Block/Crankcase
- 70mm Bore x 55mm Stroke = 212cc Max
- Stock 70mm Ghost/Ducar/Tillotson 212E Piston
- Cast Blocks Only(No Billet)
- Billet Side Cover Not Allowed
- No External Welding, Epoxy or Modifications
- Internal Modifications allowed.
Cylinder Head
- Ghost/Ducar/Tillotson 212E Hemi Head
- 27mm Max Intake Valve/24mm Max Exhaust Valve
- No External Modification
- Internal Modifications allowed.
Carburetor
- PZ22 Denki Carburetor(No Walbro or Briggs PZ22)
- No External Welding or Epoxy
- Gasoline - Fuel will be provided
Ignition
- Factory Cast Iron or Aluminum Flywheel (No Cast PVL)
- Factory Ghost 6200rpms Limited Ignitions Coil
Exhaust
- No restrictions
223/224 - All Cast on Gas
The engine Must Pull the Start
Block/Crankcase
- 70mm(+.50mm oversize allowed) Bore x 58mm Stroke = 226.5cc Max
- Cast Blocks Only(No Billet)
- Stock Factory Style Piston
- Billet Side Cover Not Allowed
- No External Welding, Epoxy or Modifications
- Internal Modifications allowed.
Cylinder Head
- Factory Production Cast (Heads not allowed: Gage, Wildcat Non-Hemi, Lifan/Shredder, Evolution)
- 27mm Max Intake Valve/25mm Max Exhaust Valve
- No External Modification
- Internal Modifications allowed.
Carburetor
- Any Carburetor
- Gasoline - Fuel will be provided
Ignition
- Billet Flywheel Only
- Factory-Style Ignitions Analog or PVL Digital
- No CDI or Programmable Timing Controllers
Exhaust
- No restrictions
240cc - All Cast on Gas
The engine Must Pull the Start
Block/Crankcase
- 72mm(+.50mm oversize allowed) Bore x 59mm Stroke = 243.6cc Max
- Cast Blocks Only(No Billet)
- Any Piston
- Billet Side Cover Not Allowed
- No External Welding, Epoxy or Modifications
- Internal Modifications allowed.
Cylinder Head
- Any Small Block Cast Head
- No External Modification
- Internal Modifications allowed.
Carburetor
- Any Carburetor
- Gasoline - Fuel will be provided
Ignition
- Billet Flywheel Only
- Factory-Style Ignitions Analog or PVL Digital
- No CDI or Programmable Timing Controllers
Exhaust
- No restrictions
Non-Competition
For those who want to see how their engine performs but don’t fit a class or want to compete. This class has no sponsorship or prizes, but the entry fee will remain the same.
- Small blocks only
- less than 310cc