Ok,
I met the mechanic out at the lake today and took the boat for a spin. Well it runs ok, but it is overheating for some reason. I need some help to figure out what it might be. I had put a 142 thermostat in it. This is also the first run since the Upgrade on the Carb and the New Air gap Intake. We checked the impeller and it was good, he had also replaced this. This is what we thought it was, but it was not this. We then checked the output to the Thermostat housing from the impeller hose, and it was good also. We then pulled the Thermostat out and tried with no thermostat in it, and it still overheats.
At higher speed it was not as bad, the temp would fall down to or below 175 on the guage, but at slower speeds it would climb up to 220 +. The lake water was pretty cold to, I would say in the 50s, so that should have helped cool it.
The only thing that he can think of is that on the new manifold, there are two water plugs at the very back of the intake, and he thinks it might need a hose between these two holes to allow the water to both sides of the intake manifold.
Before this engine would never go above 165ish, on the gauge, so I am worried now as to what would cause it to overheat.
Also, with the 4bbl upgrade and the Labbed Rev 4 Prop, I still had the same Results on my speed and topend RPMS. The mechanic drove the boat, but it still comes up and out of the water very quick and midrange seemed better for sure, even though it had no real lag.
Does anyone have any ideas as to what might be causing it to overheat? Also there is alot of soot building up now around the thru hull exhaust. He said he has the carb as lean as it can go, and its still running rich. He checked the timing also and put a fuel pressure regulator on the fuel line and its set at 3lbs psi.
Thanks for any input and sorry this is so long. By the way the lake was awesome today, and its nice to see it almost up to Full.
Bryan
I met the mechanic out at the lake today and took the boat for a spin. Well it runs ok, but it is overheating for some reason. I need some help to figure out what it might be. I had put a 142 thermostat in it. This is also the first run since the Upgrade on the Carb and the New Air gap Intake. We checked the impeller and it was good, he had also replaced this. This is what we thought it was, but it was not this. We then checked the output to the Thermostat housing from the impeller hose, and it was good also. We then pulled the Thermostat out and tried with no thermostat in it, and it still overheats.
At higher speed it was not as bad, the temp would fall down to or below 175 on the guage, but at slower speeds it would climb up to 220 +. The lake water was pretty cold to, I would say in the 50s, so that should have helped cool it.
The only thing that he can think of is that on the new manifold, there are two water plugs at the very back of the intake, and he thinks it might need a hose between these two holes to allow the water to both sides of the intake manifold.
Before this engine would never go above 165ish, on the gauge, so I am worried now as to what would cause it to overheat.
Also, with the 4bbl upgrade and the Labbed Rev 4 Prop, I still had the same Results on my speed and topend RPMS. The mechanic drove the boat, but it still comes up and out of the water very quick and midrange seemed better for sure, even though it had no real lag.
Does anyone have any ideas as to what might be causing it to overheat? Also there is alot of soot building up now around the thru hull exhaust. He said he has the carb as lean as it can go, and its still running rich. He checked the timing also and put a fuel pressure regulator on the fuel line and its set at 3lbs psi.
Thanks for any input and sorry this is so long. By the way the lake was awesome today, and its nice to see it almost up to Full.
Bryan
