The 28 Spec 2s is a .28 cubic inch big block engine. Replacing the original Spec 1S, the Axial .28 Spec 2S features a larger machined billet aluminum heat-sink head for increased surface area and cooling, adjusted timing for increased RPM (37,500 vs. 36,000), and a three needle slide carburetor that includes 8.0. 8.5, & 9.0mm venturis.
Standard features include :
- Dual bushing aluminum connecting rod
- True ABC chrome sleeve construction for durability.
- Easy to tune carburetor
This is a direct bolt-in replacement engine for any .21+ engine mount, and will accept most aftermarket shaft drive starting systems.
Engine Specs
- Size : .28 cubic inch/4.6cc
- Maximum RPM : 37,500 RPM
- Bore : 18.6mm
- Stroke : 16.9mm
- Construction : ABC (Aluminum Brass Chrome)
- Heat-sink Head : Axial Green
- Carburetor : 9.0mm composite slide carburetor (includes optional 8.0 & 8.5mm venturis)
- Carburetor Adjustments : 3 Needle, Flush Settings
- Case : Black aluminum, rear exhaust
- Connecting Rod : Dual bushing
- Sleeve : 6+2 port
- Starting system : Pull starter
- Recommended Glow Plug : Standard long glow plug
Source : Axial Racing