Hood Breathability

[billman100]

I have a question about the amount of air breathers needed in the hull. I have gutted my hood, including removing the liner. I will be rebuilding it, my question is do you think 2(two) 3/4" 45 degree bilge outlet openings will be enough to feed the motor with air/vent the bilge? I dont want to choke the motor but I want to keep it fairly water free, again no Liner.

 

[keith t]

No where near enough, personally i would say bare minimum would be 2 x 2" hoses , and that on a stock or near stock motor

 

[Req]

Definitely not enough airflow. Like @keith t said at least 2 2" holes. 38mm twin carbs are equal to two 1.5" holes but you have to account for some loss of flow in the breathers I think, you cant just match the size. Also you probably want some room to grow in the future with bigger carbs/motor. For some options here are two threads to read.

http://www.x-h2o.com/index.php?threads/step-by-step-yamaslut-squarenose-hood-mod.1421/

post 10 but reinforce it http://www.x-h2o.com/index.php?threads/will-this-work-as-my-sn-hood-mod.129353/

 

[billman100]

I realize after doing the math how dumb my question was. So am I of the understanding I need around 6.5 in^2 of opening?

 

[orangefinger]

what size engine u run ? , what hull do you have ? , what pole system ?

 

[billman100]

I have BJ 44s on JW 850, I’m coming from a bob to a SJ, Xmetal pole

 

[Big Kahuna]

If your running an xmetal pole with the 2 breather tubes, you can get by with 2 - 2" or 2 1/2" vacuum tubes in your liner.

 

[Citizen]

My Xscream hood runs x4 2" breather tubes, along with 2 in Xscream pole.

 

[TheBuzzard]

I have BJ 44s on JW 850, I’m coming from a bob to a SJ, Xmetal pole

with that motor setup, those 2 bilge fittings will be plenty. lol

 

[billman100]

Almost finished with the hood mold. I need to sand down about an inch a channel for the pole. Still waiting for glass order to arrive. I decided to go with 3 2” breather holes plus the 2 for pole.