Jet boat exhaust question.

[pstrizki]

TIA: I have an inboard jet boat powered by a ford 351W. The baffles on the inside of my exhaust broke apart. I removed both baffles and am wondering if I can use these pipes or if it will effect performance (outside of increase in noise). Will the engine still run as expected? Will it have any effect on heating/cooling the engine. Adding picture of the pipe with baffle removed for reference.

 

[Cobra Jet Steering LLC]

You may want to try asking that here https://www.performanceboats.com/forums/jet-boats.33/

 

[tdonoughue]

Pic didn't come through... and that will certainly help.

My initial thoughts: you will probably have a much louder boat. Baffles should affect sound but may also affect the heat dissipation. I know I/O's and other inboards will either put pipes straight down (to help decrease noise) or have holes out the back below surface--but they tend to go straight out I believe, so heat goes into the water directly. Dumping that heat into the jet stream may affect the jet (things like seals and such) with the heat...

 

[pstrizki]

Pic didn't come through... and that will certainly help.

My initial thoughts: you will probably have a much louder boat. Baffles should affect sound but may also affect the heat dissipation. I know I/O's and other inboards will either put pipes straight down (to help decrease noise) or have holes out the back below surface--but they tend to go straight out I believe, so heat goes into the water directly. Dumping that heat into the jet stream may affect the jet (things like seals and such) with the heat...

 

[pstrizki]

Thanks for the info. Adding a pic.

 

[pstrizki]

Thanks for the info. Adding a pic.

The exhaust goes straight out the back. Not sure what seals it would affect. Only seals would be on the exhaust sleeves which deal with the heat before it was going through the baffles so don’t think that would be an issue. One it’s out of the pipe it’s in the water and away from the boat.

 

[tdonoughue]

Yeah. I don't see an issue (other than, like you said, the noise). Mechanically, you're reducing exhaust back pressure which won't be an issue. If anything you'll get better power.

Only other thing to check: do the baffles also stop backlog to the engine when you turn them off? If that is addressed somehow, I think you're good.