9.45 Horsepower Gain with K&N Cold Air Intake

[agginline86]

that's an interesting thought (and true in terms of thermal conductivity) I wonder why there wouldn't be a larger market out there for polycarbonate, or rubber intakes. if the reason is because of aesthetics, that's kinda sad. with that said I wonder if modifying the stock intake like others have done would yield better results. If we're talking about thermal conductivity, I think the aem v2 is on to something by adding a exterior tube that creates a chamber of air on the inside.

also, I second the fact about the pipe diameters. same thing goes for wiring. if you strip the tip with pliers you will often create in essence a smaller gauge. that's why they have tools for stripping wire, so that you use the correct diameter, and not reduce the effective diameter

Thermal conductivity is a double edged sword though. Yes it transfers heat, but also dissipates heat faster as well (why metal feels cooler than plastic when you touch it even when they are the same temp) So the material probably isn't that big of a factor. I'd guess intake diameter and how thick the material is make more of a contribution to keeping the air cool.

 

[chaby_91]

Thermal conductivity is a double edged sword though. Yes it transfers heat, but also dissipates heat faster as well (why metal feels cooler than plastic when you touch it even when they are the same temp) So the material probably isn't that big of a factor. I'd guess intake diameter and how thick the material is make more of a contribution to keeping the air cool.

This means the exact same thing. Thickness only affects how much heat can be contained.

 

[agginline86]

Think about it. Get 2 buckets: one big, one small. Drill the same hole in the bottom of both. Add water. Do you think the bigger bucket will let more water/time escape? No, because both holes are the same size.

No. Flow rate is directly affected by the mass of water pushing down on the water exiting the hole. A smaller, narrower bucket would technically empty faster than a bigger wider bucket. They would not empty at the same rate. Would be impossible to tell with the naked eye tho.

Flow rate also would affect the air temp going into the throttle body, in theory. The longer the air takes to get through the intake, the more time it has to be heated up by the engine.

This means the exact same thing. Thickness only affects how much heat can be contained.

Kind of. They are due to the same property. Thickness would also keep heat out as well as keep it in. It depends more on where you're getting the air from. However even if it made any marginal difference you would see double-walled and insulated intakes. The air goes through so quickly the amount of heat gained from the material the intake is made of would be pretty small I assume.

Whether you would see a performance boost by trying to make a more ideal intake is another story.

 

[sonni_kuba]

I don't know either way, but I found this video interesting.

https://www.youtube.com/watch?v=gCi2yo4UqPI

Thank you, this is what I have been looking for, appreciate the link. This is probably the most accurate real world result.

Seems unlikely that 3rd is the 1:1 gear, but I’ve never seen the BX7A gear ratios. Some of the data is inconsistent though – the posted times don’t really make sense, they couldn’t have done both runs at 12:25:07 unless they had two stock V6 Accords on two separate dynos. And if the runs were done so close together, that is a big temperature variance.

I also saw that and was a bit puzzled. I wouldn't think a company as big and reputable as k&n would cook data, but maybe they just toyed around with other unlisted variables to arrive at that number. Interestingly enough, if you look at the graph the stock accord is making more hp and torque below 5000 rpm.

Anyway if you are investing in a J32 swap, I wouldn’t buy an expensive J30 intake, since it will be essentially useless afterward.

Actually, the AEM v2, part number 24-6016C is for both j30 and j32
http://www.aemintakes.com/search/product.aspx?prod=24-6016C

Doesn't really matter since I won't driving the j30 any longer as my 38K mile J32a2 arrived this afternoon

Get your cynlinder head and intake manifold ported, a bigger throttle body, bigger complete exhaust and then bigger intake. This will create better air flow, but at this point you might as well get yourself a bigger engine.

It's all part of the bigger plan ...