Custom 5SFE Intake Manifold Project Options

[doory100]

Got this off a 97 3sfe rav4. I'm going to customize a intake manifold body for it at my work(custom sheet metal shop). this is the starting process should look close to a beams intake when in done. Ill be using 0.100" 5052 aluminum for the body with a machined 0.250" T6 aluminum flange. I will most likely make 2 when i take the intake form my 95 GT off. So I'll have one for sale then. Any thoughts??

This post has been edited by doory100: Oct 6, 2014 - 7:40 PM

[Bitter]

You know just hacking a plenum on some runners isn't going to net awesome gains. You need to calculate the plenum volume for the targeted RPM and have runners of a tuned length to match, tuned to 2nd order harmonics if possible for the target RPM. That's why you see 30whp gains from an intake manifold on a 2ZZ or Honda's. Also because those heads have the potential to use the air being supplied, but just better tuned intake will help but probably not as dramatically as you'd hope. The stock 5S manifold is a 3rd order manifold I believe and tuned for low to mid engine speeds to provide torque, the head is also suited to this design. Don't try to fight the head, work with it. You can see a nice increase in torque with the right volume and runner length.

http://www.schmidtmotorworks.com/engine_designer.html Software like that can help make an initial design.
http://www.dragzine.com/tech-stories/engin...take-manifolds/ this outlines some of the design principles and their effects.

This post has been edited by Bitter: Oct 16, 2014 - 9:54 PM