So anyway, I was thinking about intakes and the S.

The S sounds great with an open intake, but the down sides are heat soak for intakes up high and hydrolock for intakes down low. I looked at the K&N FIPK and all it really is is a smaller airbox that is open to the hood, with a rubber seal that keeps heat soak down by keeping engine bay air out.

Great idea, but the airbox seems small, so I'm not sure how that is better than a larger volume box, and then I got thinking, why not just remove the stock airbox lid and add a similar rubber seal to the lip of the box to seal it against the hood, like the K&N does?

Then, you get the same basic idea as the FIPK with a larger box. Maybe add a cooling plate... Am I off here or what?



The intake to the K&N box doesn't look that efficient. The air is not coming right at the cone but only at one side of it, plus there are gaps in the seal where hot air can get in.

 

analysis of airflow under the hood is greatest from the larger hole from the right of the engine compartment and not directly from the front. take a look at the comptech intake housing.

 

I understand that, but if you look at the K&N, the air is coming into the smaller airbox from the front right. and then presumably getting sucked in through one side of the cone. The OEM, being farther back in a bigger box, seems to suck air in more evenly across its surface, not to mention the fact that ir generates more negative pressure to suck air in from outside. I'm not sure how much size really matters, but in either case, the air is coming in from the front-right of the car.

I think the bigger OEM box might work better since it has a larger volume and would make a bigger pressure difference to suck air in than the K&N does. I guess I'm also wondering why the K&N and Comptech boxes are so much smaller than stock.

 

I'm not sure the size of the airbox really has any impact provided it's not restrictive in anyway. Any restriction has more to do with the size of the inlet to the box and the interior shape/design of the box than the actual size.

I think the stock box is large for at least the two following reasons (there may be more)...
- one intent of the box is to reduce noise (hence the design with the baffles and resonator, etc.)
- there may be be some design aspects to help separate any debris out of the inflowing air before it reaches the filter (a large box will allow the airflow inside the box to be lower and possibly allow large debris to fall out before hitting the filter. The baffle may aid this function).

Otherwise, there really is no need for a box other than to select the location from which air is drawn, and this could be down simply by relocating the filter (I mean, look at how many intakes obsolete a box altogether. Even the K&N is close, but it needed a heat-shield with the short-pipe design.)

I'm not sure removing the stock cover and essentially extending the box up to the hood is going to make any difference as the air still needs to be drawn through the same restrictions; primarily the inlet to the box and the filter.



I don't know, I'm thinking out loud.

 

Well, as I understand the Hemholtz principle, the larger volume assists with creating negative pressure to suck more air in from the outside, creating a bigger ram effect. That, plus the air seems to come at the cone from straigh on, meaning air is getting sucked in through a bigger surface area.

I'm thinking that sealing the box to the hood with something other than the oem cover would yield a better intake sound without the hp loss associated with just removing the top.

 

I would agree with that...

 

Well, that was the basic idea... but I'd need to find something to properly seal it with, and I have no idea where to get rubber like K&N uses.

 

.......... ricer....

 

But you can go to Home Depot and probably buy something there

 

I would think that the sealing rubber the K+N uses is just like regular trunk rubber. Autoparts stores may have something that works if a home improvement store doesnt.