VENOM VEN-1827, Instruction Manual

Recommendations

Recommendations

Exhaust Recommendations

The Venom 26cc 4.5 KWA Marine Engine can accept a whole range of exhaust sys-
tems from tuned exhausts to silencers and various manifolds. Choose the exhaust 
system according to your application and follow the exhaust manufacturer’s recom-
mendations for tuning and performance guidelines.

Exhaust Port Bolt Pattern - 34mm center to center, M5 thread
Basic Exhaust Port Dimension - 20.6mm x 11.5mm

Propeller Recommendations

The Venom 26cc 4.5 KWA Marine Engine will perform with a range of propellers for gas 
boats. The Hull design, weight and drive system will have a great influence on the 
choice of an optimal propeller. Some experimentation will be required to obtain the best 
performance possible. 

Propeller Diameter range - 65-75mm
Pitch Ratio range - 1.4-1.9mm

Pro Tuner Tip

Experiment with multiple blade counts and pitch ratios for different conditions. A 3 blade 
prop will help in choppy conditions and with acceleration from corners. A two blade 
prop is the most efficient and will usually achieve the highest speeds, but it is sensitive 
to water conditions. Changing the pitch ratio will change the rpm of the engine and will 
have different performance benefits. Listen to the engine sound, aka note, when 
experimenting with propellers to find the best performance. A crisp clean sound should 
resonate from the engine when at full power with the correct prop. Use a GPS hand-
held unit mounted in the boat to compare speeds between set ups. 

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