Stock Air Box: what is a heat riser???

[JoeC5]

Hows it going fellas. Well I currently have a KKM Intake and I dont want it anymore. Unfortunately I lost all the stock air box components. Now, I am in the process of getting a new/used air box. What exactly is the heat riser and do I need it?

 

[jason]

I'm not sure but would you be willing to sell me your KKM?

 

[JoeC5]

Sure, Once I get the stock air assembled, its yours if you want it. I will sell it from anywhere to $40-50. That includes everything. Adapter plate, bolts, brackets and the plug you need for the 1 vacuum line. The only thing you will have to do is re-oil it.

 

[jason]

Cool email when you get it all installed.I know that it is bad for the engine to use hot air but i've been dreaming of making a cold air box for a while. Is this the reason your going back to the box?

 

[914x4sport]

From what I remember on my old mazda b2200, the heat riser draws heat into the intake from around the exhaust manifold to warm the engine when cold, Im not sure whether its "On" All the time or not, But I really dont see a serious need for it in FL. Interesting question though, thanks for bringing it up, Ill try to look into that area more

 

[Maniak]

The easiest way to see the heat riser is to pull the passenger side inner fender (the pastic thing). There is a tube going from the air tract to the exhaust manifold. When looking from the passenger side wheel well you will see a round protrusion (about 2-3" across) right where that tube is. There should be a vacume line on the top of it.. The vacume connection is temperature sensative... When it is cold it doesn't let the vacume through.. which means that the warm air from around the exhaust manifold is allowed into the motor.. Once the connection warms up it lets the vacume through.. which then allows the connection to close.. Now only air from the front of the vehicle is being used. This helps warm up your vehicle when it is cool out.

I may have it backwards.. (there may be no vacume whenit is warm.. I'd have to watch it).. Not all places require it.. but some places do for emisions inspection.. If you live in a warm area you could get away without it.. but It does help warm up your vehicle.. even if it is only in the 40's.

~Mark

 

[JoeC5]

Interesting....So it wouldnt really matter if I have it, b/c I am currently running the KKM which removes the heat riser parts. I will be asking plenty of more questions when I get the air box. I dont remember where all the parts go. Thanks fellas