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Author Topic: Air box  (Read 278 times)

Offline Dirtclods

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Air box
« on: March 01, 2018, 08:47:02 PM »
So a question for ya the stock air box seems to need to be vented more in my opinion. It has a KN Air Filter I don't want to go crazy on it with a pipe and rejet it. Your thoughts.

Offline Oldmanracing

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Re: Air box
« Reply #1 on: March 02, 2018, 09:00:40 PM »
Step 1 AIR - LID ON (Trail Riding and Water)

The snorkels running under the gas tank cover is a major restriction.
Go to the local hardware store and buy some sump pump hose.
Some sell it bunk in 6ft sections or a box of 24 feet.
If you have to buy 24ft, you will have enough to do 4 quads.
At around $10 this is $2.50 per set. Cheap mod.
Even though tubing is same size as stock, adapter end is .100 larger.
OD of adapter end is around 1.700, with end of tubing to first ring measuring just under 1 5/8.
Pull out your stock snorkels from airbox.
Remove clamps and pull out tubing from adapter.
Install new tubing into the large end of airbox adapter. Little WD will help.
This is a snug fit and no clamps are needed. End of tubing will fit into adapter groove.
From the groove in airbox adapter to end of tubing should measure 12in. About 34 rings on mine.
Run new snorkels along side snorkel to carb, where old tubing ran, and install small end into the airbox.

Benefits:
1- More air because tubing is shorter(minus 9inches), not under cover(hood) and less restriction thru adapter.
2- Tubing has larger ribbing which reduces the shock waves from reversion.
Reversion refers to reversed air flow, or in simpler terms, its when air in the intake runner reverses
direction for a split second. The condition is caused when a burst of pressure escapes into the
intake runner from the cylinder during valve overlap. Reversion creates resonance shock waves
which exit the open end of the tube at various rates depending on engine speed. To help maintain inertia in the airbox and resonance, thus increase air flow.

Offline Dirtclods

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  • Posts: 22
Re: Air box
« Reply #2 on: March 06, 2018, 12:01:57 AM »
Thank you! Homed depot is right down the street.

 

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