Open loop cooling / closed loop cooling

When it comes to most hi performance watercrafts today there may be some problems with head gasket failure due to hi boost superchargers. 4-tec engines we believe are a head of the game because these engines use antifreeze / coolant to cool the engine instead of fresh water or salt water like all other jetskis. If your 4-tec engine does blow a head gasket while using antifreeze / coolant your engine will not suffer any damage from coolant getting into your cylinders / engine BUT salt water or even fresh water can create damage or even cause catastrophic damage to your engine when using an open loop cooling system if your head gasket ever goes bad. In most cases when your head gasket starts to go bad you will not know right away. It will take some time for your gasket to get really bad or worn to start showing signs. One of the first tell tail signs of a blown head gasket with a factory closed loop cooling system with antifreeze / coolent will be low coolant in your coolant bottle. Another sign that you may have a blown head gasket will be antifreeze / coolant spitting or pushing out of your coolent bottle into hull/engine compartment. after that you may start to see a loss of rpm, sporadic rpm, power loss or even speed loss.

From our findings one of the first things that may start to go bad with an open loop cooling system with a blown or leaky head gasket is rusty valves & seats. Your aluminum cylinder head can also start to corrode from the water / moisture sitting in your cylinder head as well as your cylinders walls, piston and rings.

An open loop cooling systems will not show any signs or symptoms of a bad head gasket like the close loop system because the open loop system does not use a coolent bottle ( rember the coolent bottle will show signs if your gasket is bad) Most people think that they will feel a bad head gasket or feel the water getting into their engine with an open loop system. That is not the case because your engine can run on water just fine until you start to get lots of water in your engine BUT by then it can be TOO late the damage could already been done. Even when your ski is sitting in your garage the rust and corrosion continues to grow just from the moisture. We have found that salt water can start to rust your internal engine components almost over night.

here are some pics of what a fresh water open loop cooling system can do to your cylinder head when your head gasket goes bad. Now imagine if there was salt water through this engine what would it LOOK like?