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Old February 10th, 2007, 05:56 PM   #1
 
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Default New air box mod on BF750

This is a mod I just did and first post.

I did have the EHS racing lid but it was not very reliable when raining and mud kept covering it. So I decided to add dual 2" snorkels, made with ABS 90 degree elbows.

I found that the duals were more air than expected. I just got back from doing runs with a fuel air sensor (LM-1) hooked up to a exhaust bung. With one snorkel blocked off I'm very close to where I need to be. I'll open the other snorkel when I go into high elevations 7000 feet plus.
The testing elevation is 4200 feet and I was already jetted for the EHS lid.

I'll be trying it all out tommorow with about twenty 1-2 feet deep water crossings to go through. It will be interesting if steam is a problem. I have custom splash guards
to reduce water from wheels. For those wondering the stock snorkel is not blocked off.



air Fuel ratio 2 snorkels 35 mph 13.5:1
2 snorkels WOT 13.8-14.5:1

air Fuel ratio 1 snorkel 35 mph 13.5:1
1 snorkel WOT 12.5-13.1:1

My jets are 170 keihn F/R needle 1 shim .20
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Old February 10th, 2007, 06:32 PM   #2
 
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Default New air box mod on BF750

SURE LOOKS LIKE YOU KNOW WHAT YOUR DOING I WISH I KNEW WHAT THOSE #,S MEAN LOL
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Old February 10th, 2007, 06:41 PM   #3
 
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Default New air box mod on BF750

Looks good is it water Prof?
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Brute Force 650 sra
25" Mud B!!ch, ITP Type 7, stock yellow secondary,
Maroon primary,VFJ stage 3, 700 cylinders, Twin air filter
82mm Wiseco 11.5:1 pistons, CWR cams, Dynatek CDI ,
my crossover intake, Fan switch, K & N filter, BKmuzzy exhaust
Warn XT25 winch with 50' syn rope
KFX V-Force 700 SOLD :-(
VFJ stage 3 clutch, Almond primary, Quadboss full skids, Fan switch, K & N Filter with
Outerwear, 12 hole mod, Muzzy Pro with stainless oval can, Spark plug boot mod, ASR SS
Front Brake Lines, VFJ UPP intakes, Razr 2's on ITP baja's, Orange PowerMadd Handguards,
Maier carbon fiber hood, H.E.P Taillight, AC racing front bumper, AC Pro peg nerf bars
2005 Brute Force 750 to many mods to list!
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Old February 10th, 2007, 08:07 PM   #4
 
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Default New air box mod on BF750

Its not water proof if water was up to air box. This mod is for more air allowing bigger jets. To take advantage an aftermarket exhaust would help.
In the future I'm planning on a FST or FPS big bore kit. Think that is where a mod like this would really help.
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Old February 10th, 2007, 09:08 PM   #5
 
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Default New air box mod on BF750

Why not use a EHS RACING AIR BOX COVERS?

http://www.ehsracing.com/catalog/product_i...&products_id=82
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Brute Force 650 sra
25" Mud B!!ch, ITP Type 7, stock yellow secondary,
Maroon primary,VFJ stage 3, 700 cylinders, Twin air filter
82mm Wiseco 11.5:1 pistons, CWR cams, Dynatek CDI ,
my crossover intake, Fan switch, K & N filter, BKmuzzy exhaust
Warn XT25 winch with 50' syn rope
KFX V-Force 700 SOLD :-(
VFJ stage 3 clutch, Almond primary, Quadboss full skids, Fan switch, K & N Filter with
Outerwear, 12 hole mod, Muzzy Pro with stainless oval can, Spark plug boot mod, ASR SS
Front Brake Lines, VFJ UPP intakes, Razr 2's on ITP baja's, Orange PowerMadd Handguards,
Maier carbon fiber hood, H.E.P Taillight, AC racing front bumper, AC Pro peg nerf bars
2005 Brute Force 750 to many mods to list!
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Old February 10th, 2007, 09:20 PM   #6
 
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Default New air box mod on BF750

I tried it and it works great until in starts raining. If the brute 750 air box was under plastic like almost all other atv's I would of stuck with it. I've replaced the outerwear material twice and after 3-4 months it will let water through again. This is a cheap and safer way I think. The ABS was $2.38 for just 1. The sealer I used was 5 dollars and have lots left over. I already had the 2" hole saw bit.
I'm going to try it on a shallow river tomorrow and I will be able to tell if I need to extend the snorkels where they don't pick up steam.
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Old February 10th, 2007, 09:28 PM   #7
 
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Default New air box mod on BF750

<div class='quotetop'></div>
Quote:
Originally posted by brute750
I tried it and it works great until in starts raining. If the brute 750 air box was under plastic like almost all other atv's I would of stuck with it. I've replaced the outerwear material twice and after 3-4 months it will let water through again. This is a cheap and safer way I think. The ABS was $2.38 for just 1. The sealer I used was 5 dollars and have lots left over. *I already had the 2" hole saw bit. *
I'm going to try it on a shallow river tomorrow and I will be able to tell if I need to extend the snorkels where they don't pick up steam.
[/b]
Well sounds like u have done your home work.
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Brute Force 650 sra
25" Mud B!!ch, ITP Type 7, stock yellow secondary,
Maroon primary,VFJ stage 3, 700 cylinders, Twin air filter
82mm Wiseco 11.5:1 pistons, CWR cams, Dynatek CDI ,
my crossover intake, Fan switch, K & N filter, BKmuzzy exhaust
Warn XT25 winch with 50' syn rope
KFX V-Force 700 SOLD :-(
VFJ stage 3 clutch, Almond primary, Quadboss full skids, Fan switch, K & N Filter with
Outerwear, 12 hole mod, Muzzy Pro with stainless oval can, Spark plug boot mod, ASR SS
Front Brake Lines, VFJ UPP intakes, Razr 2's on ITP baja's, Orange PowerMadd Handguards,
Maier carbon fiber hood, H.E.P Taillight, AC racing front bumper, AC Pro peg nerf bars
2005 Brute Force 750 to many mods to list!
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Old February 11th, 2007, 12:41 AM   #8
 
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Default New air box mod on BF750

i would like to see how that work out
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Old February 11th, 2007, 01:51 AM   #9
 
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Default New air box mod on BF750

lol, i installed that about 5 months ago after snorkling mine with one snorkle and ricjened mine up badly, after a few ride and a good rain i saw that wasn't gonna work also. I did something similar to what you did but i added a 2nd snorkle and with the same jets you had #170's and it jetted right for the EHS lid it ran bad lean also with both snorkles open. I have a muzzy full exhaust on mine

Mines a couple of post down. Remember, the 90* elbows are facing down and will let in alot of steam!

I'll be running mine on the LM1 sometime this or next weekend to see where mine is, i know it way lean with both. later
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Mods: 29.5's on HL Wheels, Factory's on ITP type's 7's, 2" HL Lift, Dalton O/Bl primary, custom snorkles, air box mods, HMF uility, K&N filter, 170 & 165 main jets, vdi Gen II or moose module, & Venom 3000lbs. winch
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Old February 11th, 2007, 05:23 AM   #10
 
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Default New air box mod on BF750

BRUTEWISE? is this what you were wanting to do?
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