Description
Black Bull – Hand Start / Electric
235 c.c.OF PURE POWER
Engine developed for competitions, bi-place PPG, and trikes.
BLACK BULL is studied and projected in order to satisfy all pilots need expecially in terms of light weight, power, and maximum reliability.
Thrust displayed 90 kg with propeller of 140 cm.
TECHNICAL FEATURES
Single cylinder air cooled
Two stroke
Bore 70 mm
Stroke 61 mm
Total displacement 235 cc
Compression ratio 10.5:1
Fuel delivery to the crankcase: six blade reed-valve system connected to the crankcase
Diaphragm carburetor Tryton
Reducer with Poly V belt available in 1:3.0
Continuous operating temperature 180°C, max. temperature 220°C measured under spark plug
Engine mounting: by 5 shock absorbing rubber mounts
Propeller rotation: counterclockwise
Maximum RPM 8000 RPM
Spark plug NGK BR8ES
Fuel mixture 2.5% with synthetic oil, suggested brands: Malossi 7.1 – Shell Racing M – Wladoil K 2T – Elf 2 T moto
STRUCTURAL FEATURES
Hand starter
Crankcases molten in G-Al Si 9 UNI 3051 alloy subsequently treated and anodized against sea salt
Six port distribution system, and exhaust with booster
Cylinder in alloy with Nikasil coating
Piston with 2 piston rings
Head in alloy with high percentage of silicon and hemispheric combustion chamber, with squish
Drive shaft in 18 Ni Cr Mo5 with 5 thermic treatments on every component
Connecting rod in copper plated steel 18 Ni Cr Mo 5 joined to the drive shaft through very precise high speed silver-plated roller bearings
Roller bearings fit for high speed class C3
Seal ring in Viton with very high resistance and long duration
Engine weight: Black Bull hand start complete with rubber mounts and airbox in carbon kg. 16,7