Dual Intake

[Meph]

Hey guys, I was toying aroudn with the idea of a warm air intake, with an optional Cold air intake option for better performance. I would do this by having 2 seperate intake tubes leading to the filter, one that draws fresh air, and a second taking air from the exhaust manifold area. I could control then by manually blocking one off, or fabricate up an electric system If I have time. Has this been attempted, does it seem logical?

fyi its would be going on an 89 celica gt-s

thanks,

[RH77]

Originally Posted by Meph

Hey guys, I was toying aroudn with the idea of a warm air intake, with an optional Cold air intake option for better performance. I would do this by having 2 seperate intake tubes leading to the filter, one that draws fresh air, and a second taking air from the exhaust manifold area. I could control then by manually blocking one off, or fabricate up an electric system If I have time. Has this been attempted, does it seem logical?

fyi its would be going on an 89 celica gt-s

thanks,

I drew up the plans for just a project about a year ago.

The suggestion was to use a throttle-body for the flow control and the servo/motor from a fax machine or similar. You could control the hot/cold through a knob on an interface.

An easier solution is a manual system with cables.

The first step would be to see if your engine runs more efficiently with warmer air (it varies by engine design). Without a ScanGauge, just keep an eye out for knock...

RH77

[Chris D.]

you could use a manual choke cable to actuate between the two different setups..

it has some potential..

This is something I've considered making myself HAI (hot air intake)
I notice when its cold out my truck doesn't run as effeciant with FE in mind..

[Arminius]

I would love to see the results tested by a Scanguage, comparing HP and MPG under both conditions.

[Chris D.]

I'm still learning my SG, you can measure HP with em?

[tjts1]

Look for any late 80s or early 90s non turbo volvo at the junkyard. It will have a dual intake with a thermostatic flap attached to the bottom of airbox. One side takes hot air from the exhaust, the other takes cold air from the grill. Set up manual control for it and you're in business. Most volvo owners disable the hot air side completely in order to improve fuel economy, power and emissions. But to each his own.

[RH77]

Originally Posted by tjts1

Look for any late 80s or early 90s non turbo volvo at the junkyard. It will have a dual intake with a thermostatic flap attached to the bottom of airbox. One side takes hot air from the exhaust, the other takes cold air from the grill. Set up manual control for it and you're in business. Most volvo owners disable the hot air side completely in order to improve fuel economy, power and emissions. But to each his own.

Great suggestion! It's already built for the purpose...

(runs to the junkyard...)

RH77

[tjts1]

Look for a non turbo 740/940/960 because the Y shaped system is detachable from the airbox. 240 is built into the airbox.

[Bearleener]

My 1996 VW Golf has a similar system built into the airbox, which when cold pulls the air in from a baffle over the exhaust manifold (through tube 2 in picture below). When the intake air is warm enough (switch takes place between 35 and 45 degrees C) the little door moves to open up the cold air tube (4). It's activated by a thermostatically controlled vacuum switch (3) at the throttle body header operating a vacuum actuator (1), which moves the little door. Maybe you could use that for switching.

[RH77]

Originally Posted by Bearleener

My 1996 VW Golf has a similar system built into the airbox, which when cold pulls the air in from a baffle over the exhaust manifold (through tube 2 in picture below). When the intake air is warm enough (switch takes place between 35 and 45 degrees C) the little door moves to open up the cold air tube (4). It's activated by a thermostatically controlled vacuum switch (3) at the throttle body header operating a vacuum actuator (1), which moves the little door. Maybe you could use that for switching.

I couldn't help but notice: why do vehicles have these devices??? Is there something to intake air temps after all?

I had a '99 Acura TL that had an odd device. It ran coolant to small radiator-like device in the airbox. A door opened under certain conditions to warm the incoming air. I forced it open, but the 02 sensor was going bad so I can't couldn't conclude much. It knocked a lot...that's about it...

Anyhoo, is it emissions on startup? Fuel Economy?

RH77