Scoop Mounting Question
 

Im going to mount a scoop i just had a quick question about it. When i do cut the hole, is the hole just the size of the air cleaner assmebly or do i make it the size of the scoop. I only ask because if its the size of the cleaner it forces all the air in the engine. If its the size of the scoop some of the cold air gets directed to the motor to cool that off. So what size do i cut?????

I'm not the guy to answer this question from a performance aspect, but I would think if you only cut it for the flame arrestor, you're going to accumulate a lot of dirt over time inside the scoop - which will evetually clog the flame arrestor, and be a bitsh to clean. If you cut it wide open and clean, you'll still be introducing air, but it won't be as "forced".
I'm sure the experts will chime in, but those are my initial thoughts.
And remember - If you ask the question, you're required to post pics:D

Cut it the size of the scoop. This will also ventilate the engine compartment.with a ton of fresh cool air.


Darrell.

You may need to add vents for air out. The scoop will only let in what can get out. Often this can be done with a hatch door type vent on the stern somewhere. In an extreme case it is possible to swell the hatch even blow it off. Have you ever noticed on the back of the tunnel race boats that flap that blows open? Good luck,
Jim

Whatever size you cut it, you should make a carb mounted pan so only cool outside air is fed to the engine. More than just a little free power vs. warmer under hatch air.

Well if you want to make a tray and seal the hatch to separate the compartment air from the outside air that is one way to do it. I think that way is more involved. If you circulate enough air thru the scoop and thru engine compartment it will do the same thing. Different ways to achieve the same thing, ambient air to the engine.
Jim

pics of scoop
 

pics

Bouy all for you man, Also if anyone ever need something painted let me know this work is the best. Let me know what you think. If you look at the 1st pic its ghosted 572 SCI. And the 572 pic is the evntilation holes for the scoop pretty trick no? let me know what you guys think its true fire with the colors of my boat

Good advice. I also have a 12"x12" trap door that is part of the engine cover. It opens when overpressured.
It's upolstered and blends in with the rest of the hatch. It uses a simple stainless piano hinge and opens and closes as needed.



Darrell.

Do as you can see i just popped the 572 in the back i like it thinlk its differant

I know that in cars, the "ram air" effect does not start until 100+ mph. Before that, its just cold air induction.

I would say as long as you have cool air flooding the engine compartment you will be fine. I'm not sure if there is much of a gain past 100 either. Someone else here should know, and you can calculate it pretty easy also if you wanted to see how much pressure difference you would get.

I've built a new hatch with two scoops for my old boat. The scoops were locally made [ similar to Harwoods ] and I cut them down for low profile look. Cut the ends off too , so the air flows right through .I have stainless screens in the intake and the rear oulet to keep any critters out . The ambient temperature is at least 20 degrees cooler in the engine bay now.Here are some pictures .
http://www3.telus.net/spectrasonly/Scoop%201
http://www3.telus.net/spectrasonly/Scoop%20project%202
http://www3.telus.net/spectrasonly/Scoop%20project%203

We have a ZZ 572 in my friend's boat we put together 2 years ago . The engine is covered with an engine box inside the enclosed cabin .
We've installed a similar scoop on top of the cabin and air directed thruogh a duct .The temperature is a constant 72 degrees inside the engine bay at WOT .
http://www3.telus.net/spectrasonly/IMG_1858.jpg
http://www3.telus.net/spectrasonly/c...20interior%201

WHAT kind of boat is that?? I love the headers and the teak...

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Originally Posted by Scott B (Post 2289775)

WHAT kind of boat is that?? I love the headers and the teak...

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A one of kind , not for production. . My friend built the entire boat in 3 yrs, including the mold . He destroyed the mold afterwards. The boat is 33' , foam cored hull and weighs at 6000 lbs rigged . We had her up to 65 mph on GPS .
He's in the process of painting the hull sides blue and some simple trim colour. The wood inside is actually mahogany , and the headers are dry Stellings . He did the inside finishing on 'Status Quo' when he worked for Sovereign [ now Richmond Yachts] http://www.richmondyachts.com/gallery.html
I've been on 'Sun Chaser' to check it out while it was being finished, and it's one nice yacht too .
Here's a test run of Craig's boat from 2 yrs ago http://media.putfile.com/Craig-pushes-the-stick