Author Topic: hybrid air box (Read 2504 times)

LTman · « **on:** April 29, 2014, 08:30:32 pm »

ive ben tinkering with bulding a box for a hybrid for a long time hears what i came up with it
it has a 8 inch long uni filter on it now and can hold a 9 inch long filter

LTman · « **Reply #1 on:** April 29, 2014, 08:33:29 pm »

I still got to build a lid for it

ZillaFreak · « **Reply #2 on:** April 30, 2014, 04:31:07 am »

Talk about a small opening to let air in.

And you plan on sealing it up? Where will it get air to feed the engine?

LTman · « **Reply #3 on:** May 01, 2014, 07:55:53 pm »

The opening is 5''x7'' plenty big to get the filter in and out there is and 1 1/4 '' gap all the way around the filter
The tub from the carb is 2 1/2''
The lid is not going to seal up comply + im going to dill some air holes
All the aluminum is 1/16''

ZillaFreak · « **Reply #4 on:** May 02, 2014, 04:35:03 am »

5x7 is a tiny hole to let air in. then putting a lid on there will make the hole even smaller.

plus it looks like the grab bar function is pretty much useless now.

LTman · « **Reply #5 on:** May 02, 2014, 04:41:43 pm »

I wasnt trying to make it pretty
how many cfm will a 5x7 hole flow
how many cfm does a 500 need
i no a 2 1/2''mandrel bent pipe will flow 509 cfm

LT250RWV · « **Reply #6 on:** May 03, 2014, 12:53:47 pm »

Looks pretty good to me

ZillaFreak · « **Reply #7 on:** May 04, 2014, 12:39:29 pm »

The air box is crap.
The tiny opening limits air flow. So why have a huge filter when you put a small opening on it?
The longer the tubing, the worse your throttle response will be.
It has been proven many times, a pod attached to the carb makes more power than an air box.
On a stock banshee with pipes, going from air box without a lid to pods had more power everywhere and had 3hp more.

The grab bar function is useless now as this ugly air box takes up all the space.

Oh and the welds look like crap.

LTman · « **Reply #8 on:** May 04, 2014, 08:02:39 pm »

LOL Are u 10 lmfao
Is that u doc

Its not a stock airbox
How many stock boxes will hold a 8'' filter
Let see some comparison then
Its not a banshee

I like helpful advice but your not giving any

I weld on billion $ equipment every day I do admet im not real good at aluminum yet
Lets see some of your fab work
Im going to make it with a built in rack for hauling gas to its still a work in progress Ill post pics when im done
Any helpful advice is appreciated

ZillaFreak · « **Reply #9 on:** May 05, 2014, 04:46:53 am »

My fab work

Iceracer · « **Reply #10 on:** May 05, 2014, 01:10:11 pm »

I would bet you a doughnut if you run a much larger tube from airbox to back of carb you will pick up power. For instance on a cr 85 powered quad going from pod on the back of the carb, I had to use a tapered silicone boot to run the same pod filter I used to run on my hybrid. After I didn't have to jet the bike down and loose power unlike all the other smaller tube size stuff I used, now on a Hybrid a couple jets is only a couple percent hp loss, on the cr85 it was magnified so 3 jets was like being down 6 hp.

The cfm measure you need is instant and turbulent, not constant and steady hence a larger diameter to overcome the restriction on the walls.

LTman · « **Reply #11 on:** May 05, 2014, 03:11:59 pm »

What kind of donuts u like lol
I was going to go with 3'' but couldnt get it to clear the linkage
2 1/2 '' is largist tub that i could get to clear
The I.D of pipe and the large end carb are the same
I was thinking of runing anther tub around the other side of the linkage but didnt but still might
Id like to keep the same power as before but i got to protected my engine
Ive not tested this yet ben working ot and got to watch baby in ev
what size tub do u recommend if i didnt have clearace problems
Thanks for the input
Paint is a welders best freind

Iceracer · « **Reply #12 on:** May 05, 2014, 05:22:27 pm »

I'd say at least 3" maybe up to 3 1/2. not sure its more of a trial thing. But with that kinda length its deffinatly restricted.

El Diablo · « **Reply #13 on:** May 06, 2014, 12:11:30 pm »

Zillafreak, that is awesome fab work. But can you try to be a little more supportive of some of the others efforts? Please? I'm sure he is trying his best

LTman, what makes you require an air box?

LT250RWV · « **Reply #14 on:** May 07, 2014, 08:50:00 pm »

West Virginia mud Brian.

El Diablo · « **Reply #15 on:** May 08, 2014, 12:56:08 pm »

Could you fab up a shroud for a pod filter that way it's protected from mud without the power penalty?

LTman · « **Reply #16 on:** May 12, 2015, 08:54:34 am »

revised box havnt tested it yet

LTman · « **Reply #17 on:** May 12, 2015, 05:07:02 pm »

Tested the air box today no jeting change from no box to this box then it all went down hill

I hit some trails rode for about 20 min every thing was going great I got home so I desided to open it up on the road took it up the road probly hit close to 100mph turned it around to go home I open it up again fast as it would go then the rear wheels lock up running probly 100mph I nearly lost it I stil havnt looked at it Im afraid to see what it going to cost to fix

let do the gessing game

LTman · « **Reply #18 on:** May 12, 2015, 07:19:58 pm »

pulled the plug looks pretty good to me

98 LT250R Hybrid · « **Reply #19 on:** February 27, 2017, 03:24:39 am »

Pods are for desert use only. If ran in the mud or dust you will be rebuilding after one day. Nice fab work for a guy doing it yourself LT👍🏻

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Author Topic: hybrid air box (Read 2504 times)

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