Tech suggestions
Tech suggestions
Hola Drowned Rat :
Nice sib/engine configuration set-up , 3 recomnedations as I have passed through same experince :
1-Inflate all chambers evenly to 3.5 psi with a pressure gauge, by finger is a stupidity, you'll be off by about 1.0 psi thinking you got right recommended working pressure.
2-If you are experimenting water splash inside sib transom means you are having slight less full throttle speed and water drag against engine tail. Measure upper transom to lower transom end, if the distance is under 40 cm, let's say 37/38 cm, you need to raise your transom height a bit.
Tohatsu recommends a height between 1 to 5 cm from boat's bottom (transom to anticavitation plate. Best transom height for engine is around 40 cm, will better top speed with excellent boat overall performance.
Water level should pass slight under anticav plate once on plane, not good if against or over anticav plate, an indication you'll need to raise engine
40 kilometers/hour is the best speed to achieve with an 18 engine on calm waters, no wind with sib correctly inflated and propperly weight balanced, if looking for more speed try a 25/30 HP on back.
3.Try performing wot test to engine to see if prop is reaching max rpm at full throttle, factory recommendations for max speed.
If no water splashing inside, try points 1-3.
Happy Boating
