Bosunsmate
Admiral
- Joined
- Apr 7, 2012
- Messages
- 6,129
Heres where i did mine, just to starboard of the centre line at the very top of the crankcase not the exhaust chamber housing where it seems drilling is about to take place.
Photos below
The theory on it is it that it evacuates airbubbles so in my opinion the highest part of the watercavity is the best spot. Since the top of the cylinder jacket is higher than the exhaust housing roof i have put mine where they did in the photos on iboats but as i said just off to starboard so i didnt drill into the cylinder wall.
With the old system if there are air bubbles then they are going to begin being trapped at the top of the motor which is above the exhaust housing roof, which means they are then going to be sitting at the top in the crankcase water jacket by the number one cyclinder, exactly the hottest part of the motor and precisely where you want water cooling not stagnant trapped air.
So the moment the boats started up at idle at the wharf the airbubbles will form there at the top and many more if your motor sucks a bit of air as you have it trimmed up as you move out to sea or you ride stern high over a wave.
So im very glad that isnt going to happen to mine when im out on my way fishing in about an hour.
The white stuff to the stern is heat transfer epoxy for the temperature gauge sender i installed in the head
Photos below
The theory on it is it that it evacuates airbubbles so in my opinion the highest part of the watercavity is the best spot. Since the top of the cylinder jacket is higher than the exhaust housing roof i have put mine where they did in the photos on iboats but as i said just off to starboard so i didnt drill into the cylinder wall.
With the old system if there are air bubbles then they are going to begin being trapped at the top of the motor which is above the exhaust housing roof, which means they are then going to be sitting at the top in the crankcase water jacket by the number one cyclinder, exactly the hottest part of the motor and precisely where you want water cooling not stagnant trapped air.
So the moment the boats started up at idle at the wharf the airbubbles will form there at the top and many more if your motor sucks a bit of air as you have it trimmed up as you move out to sea or you ride stern high over a wave.
So im very glad that isnt going to happen to mine when im out on my way fishing in about an hour.
The white stuff to the stern is heat transfer epoxy for the temperature gauge sender i installed in the head
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