Injen Intake: HEATSHIELD RATTLE

[GreyZone]

Heat shield is a great idea, but rattles like a !@&@^#@@!

Any good fixes for this other than ditching the heat shield which I'd rather not do?

It seems better once my engine is warm, but is worse when it's cold.

[Nemesi609]

what does the heatshield do? why do you need it?

[Ferguson]

Mine does not rattle at all. Is everything tight?

what does the heatshield do? why do you need it?

The heatshield is there to block some of the hot air from engine and transmission from going straight into the intake.

[Nemesi609]

so hot air bad? then why would you use a short ram if it is taking hot air from the engine? sry it just seems a little counter productive, how does the heat shield work?

[beeristasty]

A short ram offers less restriction when compared to the stock air box. Also, once the vehicle is moving, cooler air should be forced into the engine bay from the front grill.

But, the main reason is that it sounds bada$$.

[Nemesi609]

i know what a short ram is.. i was wondering the purpose of a heatshield, did the stock air box have one? what is the problem with hot air

[GreyZone]

someone could post a picture, that would explain it pretty good...basically keeps the immediate intensity of the heat level from from the filter (primarily shielding it from the transmission). While its a good idea in theory, Im not sure how much good it really does...except mine is so close to the transmission case it is hitting it and rattling.

Furgusen: Yours doenst hit your transmission case? How high above it is it? I couldnt get any clearance.

[michaelthepsycho]

i know what a short ram is.. i was wondering the purpose of a heatshield, did the stock air box have one? what is the problem with hot air

Are you serious? If you are then: hot air has is less dense, carrying less oxygen molecules per give volume; the more oxygen the more fuel can be burnt and logically, more power would be produced.

[JDRosenberg07]

i have the injen intake on my 2.5 and im not exactly sure how the setup is on the 3.5 but my heat shield is pretty much wedged between my fuse box and the piece that holds the battery so i have no rattling what-so-ever

[beeristasty]

I'm not trying to be condescending, but I did answer 1 of the 3 questions you asked:

then why would you use a short ram if it is taking hot air from the engine?

The answers to the other 2 have been covered. Seriously, I don't think someone should have to explain the purpose of a heat shield. To further expand on the problem of cooler air vs. warmer air, the engine operates on certain air-to-fuel ratios. Warmer air is less dense than cooler air, so the volume of the air in the cylinder directly relates to the amount of fuel introduced into the cylinder. Generally, less air volume = less fuel, which = less power when running at an optimum a/f ratio.

[Ferguson]

Furgusen: Yours doenst hit your transmission case? How high above it is it? I couldnt get any clearance.

It's a close fit but no, it doesn't actually touch anything.

[Nemesi609]

i

I'm not trying to be condescending, but I did answer 1 of the 3 questions you asked:

The answers to the other 2 have been covered. Seriously, I don't think someone should have to explain the purpose of a heat shield. To further expand on the problem of cooler air vs. warmer air, the engine operates on certain air-to-fuel ratios. Warmer air is less dense than cooler air, so the volume of the air in the cylinder directly relates to the amount of fuel introduced into the cylinder. Generally, less air volume = less fuel, which = less power when running at an optimum a/f ratio.

i understand cold air good, warm air bad, just wondeirng how it works.

[Ferguson]

To put it another way, cold air is more explosive, warm air less so. We all want cold air.

[michaelthepsycho]

Maybe if you spent more time in your high school chemistry class listening to the instructor you wouldn't be asking this because I've answered it before and you obviously didn't bother reading it.Quote »Are you serious? If you are then: hot air has is less dense, carrying less oxygen molecules per give volume; the more oxygen the more fuel can be burnt and logically, more power would be produced.[/quote]Combined gas law:

P1(V1)/T1 = P2(V2)/T2

P = pressure and T = temperature and V = volumeP1 = P2 (same theoretical atomospheric pressure)T1 > T2 (warm air vs cool air)Hence V2 < V1 (same amount of air but taking up less space)

So the difference in that space = the EXTRA amount of air (oxygen) your engine can take in. And what happens when you burn fuel in your engine? Hydrocarbon bonds are broken for energy and oxygen is combined with the broken carbon molecules to form carbon dioxide / monoxide. This is why you need more air and why you need a "heat shield" to try and keep temperature lower. Your car has an oxygen sensor which tells how much fuel to inject based upon the available oxygen in the air. You do agree more fuel = more power, no? So cooler air -> more oxygen -> ecu determining more fuel can be inject -> more power can be produced.

[psi101101]

i love the science lecture, thank god im going towards the film industry..

[GreyZone]

uhhh, I'm just glad I dont have to understand the science to enjoy it!

[downedzephyr]

Dead thread revival! Has anyone found a solution for this? My heatshield rattles as well, the situation seems to be very similar to OP's

[Kango]

I had this problem too. Just loosen the bolt for the cone and shield... and play around with it a little. Tilt it away from that big silver metal thing. Also make sure the pipe is all the way inside the cone.