Want to get either a velocity stack or scoop from CPPerf to dress up my engine a bit, but I also want to get whatever will perform better. 

I've heard placing a scoop facing backwards works better than scoop facing forward.  Is a velocity stack any better or worse than a scoop?

or does it not matter at all?   

I don't know the answer, but I'm interested if anyone indeed knows this answer or has tested it? I've got both, and as soon as I hit the water I will be testing both back to back.

Edit, I also have a fiberglass scoop I can test out, front and back... hmmmm....

You scoop whore..........Why dont you share

2sav

i tried my scoop both ways at parker, and as GT said i didnt like to hear the noise so back around it went. i didn't notice any performance gain or loss either way, but, wasn't really testing either. i run my scoop backwards on the race boat so i don't get water down the carb when i get hosed down.

now mechanically you would think that facing forward you would get more air, but the engine is only going to suck in what it can get out. i dunno The negitave pressure should feed a more smooth rate of air vs it getting crammed down its throat facing forward. once again i have no facts to prove it

all the drag cars face forward, is that because they cant face towards the rear but on some older muscle cars the openings in the hood faced towards the rear. (for looks or performance?) I'll stop rambling now sorry

I was hoping someone was going to make the noise argument  The reason most "Muscle cars" had the scoops backward was because of water, and "cowl hoods" tack advantage of the pressure from the windshield.

As far as "cramming" air down the throat of the carb, this is exactly how a "blow through" turbo setup works But get an a-hole in front of you with a good roost, and you now have a 100% efficient water injection system (blows the carbon right out of the engines valves though).

All this talking about scoops, and i dont have one..........Maybe i can get a velocityscoop combo

What an idiot.......

2sav

well, the only reason ive heard of the scoop having to face backwards at places like parker strip u have to have it backwards if you dont have a spark arrestor...trust me, it works! my motor has backfired into my ex-girlfriends hair, and also backfired backwards when the scoop was facing rear...so it is actually a safety issue also.

plus!, in order for a scoop to actually make a difference on a naturally aspirated motor, is if ur doing at least 90 in my opinion. then it will finally create a charge...i never saw a performance difference between the two placements.

Reid

Never seen a dynomometer with an 80MPH wind blowing toward the engine either, what do you think, did we stumble on something here! I'm thinking Wind tunnel/Dyno combo we'll be filthy rich!!!!

Then again my stuff never works out that way, I think them up then 1 year later I see one marketed (story of my life).

haha good idea!...my buddies brought that idea to light w/ me a couple years back, and they DID notice a difference on their drag cars, mainly because they figured it would be the same thing as a few PSI on a supercharged motor...but who knows?

The dual velocity stack club is very small on this board.  I think Marcsrollin and myself are the only members 

I need to chime in on this one.

Scoops can only do two things - bring in cold air, and bring in cold pressureized air.

On a car, the windshield creates a high pressure area, so the chevys went with cowl induction.

Mopars and Fords took the air as it went over the hood, avoiding the 180 degree turn the cowl induction forced.

If the scoop opening is big enough, and as was said before the engines are just a big air pump, there is a positive pressure build which forces more air into the engine. This is why drag race cars have the scoop facing forward - every bit helps.

I know my duster's scoop can create a few pounds of boost at speed. Free HP.

I love when people ask how much HP you see on the dyno with a scoop or ram air - you don't see any - IT'S  A DYNO - you aren't moving!

On a boat, if you went fast enough, the forward facing scoop would give you a HP advantage. With most boats however, the engine hits top RPM long before airflow becomes an issue, so really it would work either way. The scoops on boats are supposed to face backwards so if there a backfire, the occupants don't get fried or catch something on fire, which really isn't that big of an issue in a car. Huge issue in a boat.

Velocity stacks straighten the air to give more HP, so it is not and either or with a scoop. You can have both.


On my boats setup, I oped for two K&N's hanging out of the cover. The tunnel ram after a hard run is around 38 degreees give or take according to my infrared thermometer.

Wow!  well after reading all the replies I think I will probably go with the stack.  The stack is cheaper, and my boat will never see over 80mph.  If I did get a scoop I would surely face it backwards after hearing about the backfire incident.

The stack should look nice. 

Good info, I just run a Dooley stainless scoop with a USCG approved flame arrestor inside, it has always looked good and is totally functional, The main reason I like it is I do some boating in the northwest and it seems to always rain on my parade...the scoop sheds water pretty well, whereas the stacks make great funnels

Killer info again..

My scoop used to face forward until this last Memorial day. It was raining on the way to Parker, so I turned it around to play it safe. I have a flame arrestor inside too. Now I am too lazy to flip it back around. On my buddies boat, our friend had a nice little shock when the boat backfired. Needless to say his scoop is now facing backwards too. I don't know if there is any truth to this but I heard the fiberglass scoops are the best ones for ramming air into the motor and the normal aluminum ones don't help much, just more cosmetic.