Engine Scoop Idea

[Mr.GhettoRig]

I really like the look of engine scoops with the butterfly valves on them. well my briggs 5hp came with two holes drilled in the side of my blower housing so I thought why not make use of them? :shrug:

so I drew up this working drawing on autocad. :thumbsup:

all dimensions are in Decimal Inches.

this is the face of the scoop, the small hole to the left is open for engine idle. the two other holes are for the plates, which are in the below drawing.

The circle on the right is the plate for the first drawing, its 0.01 smaller than the hole so it has some room to move. The drawing on the left is part of the casing to the blower. the start thickness is the same as the thickness of the plate, notice that there's still a tiny bit of thickness on the faceplate. This is so the faceplate can sit at a slight angle inside the shell. the end thickness is 1+1/2 the size of the pipe in the below drawing. this piece will be bent around the faceplate and the pipe to form the shell.

The end pipe for the blower. the idea is to attach a hose (and clamp) to this and the other end to an adapter on the carb.

I know this probably wont give me anymore performance at all, but I just think it will look cool. the butterfly will be opened by the engine suction when its given throttle, and ill have a spring to return it on idle. that's not in the drawing but its also not that hard to set up..

here's a crappy cardboard mockup

Tell me what you think, also IF I do decide to make it, I might have some uhh.. left over materials if anyone is interested :wink::thumbsup:..

 

[Clayon]

MAKE IT!!!! Seriously, that would be sooooo cool. :thumbsup: If it works, I could possibly be interested in having one.

 

[Mr.GhettoRig]

my worry is that the distance the actual opening in the scoop is away from the carb, combined with the 'hard turn' of the tubing connecting from the scoop to the carb is going to be too much for the engine to run right, unless your moving and air is forced to flow in. ut:

like I said its more for looks than anything, I don't expect any performance boost. I mean the airflow is better when your moving, but I don't think it'll be much of a difference. however if it brings performance down, I probably wont make it.

I also need to incorporate an air filter.. in case there's a very 'unfortunate' mosquito. :laugh:

 

[minidragbike]

I can't remember how fast you have to go for it to create a little boost, but it sure do looks good. :thumbsup:

You might need a cable on the air fuel mixer screw so you can turn as you run.

 

[Mr.GhettoRig]

that was another option.. i was gonna see if I could hook up some kind of linkage system from my throttle butterfly on the carb to the butterfly on the scoop..

edit, thanks it'll look better when its not tape and cardboard though lol

 

[Ibanez616]

Those have always looked somewhat tacky to me unless they were on a real drag car. If you could made the butterflys actually open along with the throttle, that would be cool.

 

[Mr.GhettoRig]

Those have always looked somewhat tacky to me unless they were on a real drag car. If you could made the butterflys actually open along with the throttle, that would be cool.

im trying to come up with a way for that to work.. im gonna need some kind of wierd linkage system.. i gotta build the scoop first though... if i build it at all..

I just though't it'd be cool because I don't see too many scoops on small engines, only one I've seen is in KKK's picture. :shrug:

 

[GraveBugger]

im trying to come up with a way for that to work.. im gonna need some kind of wierd linkage system.. i gotta build the scoop first though... if i build it at all..

I just though't it'd be cool because I don't see too many scoops on small engines, only one I've seen is in KKK's picture. :shrug:

linkage shminkage, use a short cable from your throttle lever to the faux injector hat and badda bing badda boom, working butterflys

 

[Mr.GhettoRig]

linkage shminkage, use a short cable from your throttle lever to the faux injector hat and badda bing badda boom, working butterflys

But from the caburetor to the arm on the scoop it's gonna be a hard angle .. Maybe if I bend it in an arc it will convert the outward motion to a push.. It might work. :shrug:

 

[Mini Motors]

Maybe I missed something, but these holes in the shroud. Are you going to use them only for mounting this thing? At first, I thought you were building this for cooling, but I saw that as a hindrance to that airflow. Certainly holes in the shroud could effect the cooling airflow, so it's good that you're plugging them up,

There should be some ram air action from this design. Maybe even noticeable. It's hard to say with a small engine like that. It all depends on the aerodynamics of the rest of the vehicle, and whether the air is allowed access to it or guided away.

 

[dashben_01440]

so is this going to be done? i would like to see how it turns out so i can do somthing like this on my racing mower.

 

[1BadFox]

Thats awesome!........ A bug catcher on a mini bike. :thumbsup:

 

[Mr.GhettoRig]

I dunno yet, I really want to but I need money first, also my drawing was bad. I cut them on paper and the body was a tad too small. I think I know why though (i need to add half of the top straight line plus the radius of the arc). so maybe ill fix them later. oh yeah and I want to figure out a way to get an airfilter in there somewhere

and then I need $20 to buy the metal. (thats after i pay myself back for a bad ebay deal) :doah:

 

[oldfatguy]

I have an idea for the linkage.

Put an air vane governor from a 3 hp briggs on it {it mounts to the coil] then hook up the linkage so that it opens the two butterfly blades as the engine speed increases

 

[GraveBugger]

I have an idea for the linkage.

Put an air vane governor from a 3 hp briggs on it {it mounts to the coil] then hook up the linkage so that it opens the two butterfly blades as the engine speed increases

genius... just genius, way to go ofg:thumbsup:

 

[metal man]

I dunno yet, I really want to but I need money first, also my drawing was bad. I cut them on paper and the body was a tad too small. I think I know why though (i need to add half of the top straight line plus the radius of the arc). so maybe ill fix them later. oh yeah and I want to figure out a way to get an airfilter in there somewhere

and then I need $20 to buy the metal. (thats after i pay myself back for a bad ebay deal) :doah:

well some of the problems could have a easy fix . the butterflys could be run with a bike cable to a lever on the butterfly . you could run it inside the housing and hook it to the throttle plate on the carb . then use a small spring to keep them closed . as for the filter if you have the body empty you could set in a foam filter like what is used on most briggs motors . you get one of the big ones from the hardware store (like $6) and cut it to fit nice and tight in the body of your scoop .
what materals are you needing ? i have some aluminum sheet and some small plate and piles of other crap too . i could look and see what cool weird shit i have in stock .:shrug:

 

[Mr.GhettoRig]

well some of the problems could have a easy fix . the butterflys could be run with a bike cable to a lever on the butterfly . you could run it inside the housing and hook it to the throttle plate on the carb . then use a small spring to keep them closed . as for the filter if you have the body empty you could set in a foam filter like what is used on most briggs motors . you get one of the big ones from the hardware store (like $6) and cut it to fit nice and tight in the body of your scoop .
what materals are you needing ? i have some aluminum sheet and some small plate and piles of other crap too . i could look and see what cool weird shit i have in stock .:shrug:

according to my design:
1" long 7/8 OD pipe (inside doesnt really matter) (anyone know where I can find a 7/8 ID hose???)

1/16 thick 'hard' metal (type of metal doesnt really matter as long as it can be cut in CNC and it wont bend too easily easily.)

and then a sheet of metal, possibly aluminum that can be shaped by hand. according to my drawing I was gonna use .025 gauge but you tell me. this is used in making the two shell halves.

I gotta re dimension everything AGAIN because once again, my shell didn't fit PLUS the scale got messed up when I printed this time. But I'm gonna start from scratch and include the throttle pin and butterfly. I'll just run a curved shaped piece of a wire hanger to make it around the angle, and it will pull from my carb butterfly. its the easiest. the return spring is even easier. :thumbsup: and the airfiler, I was thinking that is the only way it would work, but its not that much of a hassle. your talking about those green foam things right? I think Tec. mowers use them too. what I find is what I'll use

metal man if you had some scraps I could make use of it would sure put a smile on my face :innocent:

 

[Txpowdercoater]

But from the caburetor to the arm on the scoop it's gonna be a hard angle .. Maybe if I bend it in an arc it will convert the outward motion to a push.. It might work. :shrug:

or use a throttle with dual cables like for dual carbs

 

[The Restore Kid]

I can't remember how fast you have to go for it to create a little boost, but it sure do looks good. :thumbsup:

You might need a cable on the air fuel mixer screw so you can turn as you run.

:laugh: Neither do I, but I know the one on the Suicycle would do (something) at like 50 or so... Pretty well just a difference in the exhaust note.. You can't tell a difference in speed, but if ya block the airflow with your hand, it sounded different.. :laugh:

 

[Mr.GhettoRig]

updated my design.

Blower Face:

first of all the ends are circles this time, not added radius's, made it easier to get a measurement off of. and it looks neater. the hole for idle is bigger, to accommodate for the air filter and the hole being so far away from the carb.

Here I also have a new drawing of the throttle pin (its gonna be a 1/4 DIA rod. I'll grind down the parts that show the hatch marks, down at the bottom theres a slit for a snap ring.) also the plates, and butterfly.

Blower Shell:

added 1/2 in. where the faceplate and pipe connect, for ease of getting the thing put together :laugh: the pipe is exactly the same, no use in changing that. also edited the dimensions where the body connect to the pipe, it was too wide last time and overlapped.

lets hope the body fits, or its back to autocad again.. and again.. and again :hammer::doah: