Airbox construction

[chartreusehj]

IMO anything that reduces the inherent restriction in the inlet tract must be good for power/throttle response.

agreed. a lot of factory airboxes are already restrictive, have too small filtration area, and are used as a cheap and cheerful (manufacturer budget, not forumite) way to dampen induction noise to pass ADR's.

Open the fucker right up and let it breathe!

Fuck off any of that "accordian" looking flexy shit and make nice bends, or even some silicon cooler pipe, needs to be smooth as a babies bum everywhere to do the right thing by the air.

A friend of mine likens inlet airflow to a b double truck, needs a nice turning radius and not too many stop/starts or shit goes bad...

[Russell]

There is such a thing as too much air, I was about to start having a look at what my tuner and I thought could work just before I spun a bearing.

Big fuck off K&N cone filter + open fronted airbox = too much air.

[ahk068]

Wouldn't access to clean cold air be far more important that the size of box/filter. Would a large box behind a filter just act as a big area of low air speed? Keeping the filter/box smaller and putting it in the right spot seems smarter to me.

[GTSBoy]

There is such a thing as too much air, I was about to start having a look at what my tuner and I thought could work just before I spun a bearing.

Big fuck off K&N cone filter + open fronted airbox = too much air.

WAT?!

[HoonBoy]

There is such a thing as too much air, I was about to start having a look at what my tuner and I thought could work just before I spun a bearing.

Big fuck off K&N cone filter + open fronted airbox = too much air.

Sounds like not enough fuel...

[Russell]

Sounds like not enough fuel...

Fuel definitely not the issue, lots there from the 270lph Walbro and the 39lb injectors. Fuel curve is fucking sexy too.

[Mr Ed]

I think those ram style intakes are bad for different reasons (lets water in/etc..)

I dunno about drivability, but for power my understanding has always been:
More air = good
Turbulent air = bad

Ie. A good design is still needed, even if the airbox/plennum is massive.

[Russell]

Wouldn't access to clean cold air be far more important that the size of box/filter. Would a large box behind a filter just act as a big area of low air speed? Keeping the filter/box smaller and putting it in the right spot seems smarter to me.

This is my point, airspeed plays a fair role.

[HoonBoy]

You shouldn't have a fuel "curve"... should be a nice flat line on a full power run.

[Mr Ed]

Wouldn't access to clean cold air be far more important that the size of box/filter. Would a large box behind a filter just act as a big area of low air speed? Keeping the filter/box smaller and putting it in the right spot seems smarter to me.

Air velocity shouldnt matter until it gets closer to the cylinders. Flow is all that should matter at the intake.

[Russell]

You shouldn't have a fuel "curve"... should be a nice flat line on a full power run.

It's a windsor, nothing is perfect :O

But it was damn close, very damn close.

[Russell]

Air velocity shouldnt matter until it gets closer to the cylinders. Flow is all that should matter at the intake.

Air velocity can matter further away but you are correct, it does matter more and more the closer to the cylinders it gets. Intake design can affect it all the way along though.

[Mr Ed]

Intake design can affect it all the way along though.

Agreed, thats what I siad a few posts ago.

A big airbox has definite benefits, those benefits just dont mean that all flow design is thrown out the window.

[dirtyrex]

Sounds like not enough fuel...

Umm yeah, that's what I thought too.

What about motors without airfilters? Do they blow up because there's too much air? I always remember just adding more fuel depending on the weather conditions.

[Russell]

Agreed, thats what I siad a few posts ago.

A big airbox has definite benefits, those benefits just dont mean that all flow design is thrown out the window.

Fuck, never thought I'd be agreeing with you. More air is good, just not too much and not at the sacrifice of design.