engine room air circulation
#12
Registered
Joined: Aug 2015
Posts: 57
Likes: 0
From: Tarpon Springs ,Fl
#13
Registered

Joined: Nov 2004
Posts: 14,094
Likes: 3,684
From: On A Dirt Floor
#14
Platinum Member
Joined: Dec 2002
Posts: 2,195
Likes: 2
From: Dallas, TX
Pretty much as air is drawn or forced into the intake, the vents into the bilge will allow the air to be drawn into the engine compartment. You just need to make sure that the vents into the bilge are large enough to feed the engines. The more HP, the more air that is needed. How do you know the right size?....that is above my pay grade 😳
#16
Took the air filter off my old Nordic with a 496HO and raised the hatch...no difference.
#17
Registered

Joined: Feb 2012
Posts: 4,031
Likes: 10
From: westville, NJ
having enough air to run is nice. having enough airflow through the bilge to keep gas fumes from accumulating to an explosive mix is much nicer. they put those cute little fins on vents one side facing forward, one side aft. I don't know if that works or not. if they are where airflow causes low pressure not much will get in. bigger sportfish sometimes have engine air intakes going straight to the side vents so they get air that hasn't been pre-heated by the engines and exhausts. even the hottest day the ambient air is cooler than your engine compartment.
#18
Registered

Joined: Nov 2004
Posts: 14,094
Likes: 3,684
From: On A Dirt Floor
For visuals to make it easier
502cid x 5000rpm = 1,255,000 cubic inches (726 cubic feet) of air per minute
2 x 502cid's x 5,000rpm = 2,510,000 cubic inches (1452 cubic feet) of air per minute
The following is the size of 1000cuft
502cid x 5000rpm = 1,255,000 cubic inches (726 cubic feet) of air per minute
2 x 502cid's x 5,000rpm = 2,510,000 cubic inches (1452 cubic feet) of air per minute
The following is the size of 1000cuft
#20
Registered

Joined: Jun 2007
Posts: 7,311
Likes: 1,817
From: Merritt Island, FL
I do know when we were testing the engine room was about 20-25 degrees warmer then outside.



