Check out this advanced intake design thats in a jdm (japanese domestic market) midsubishi engine (link below). It has 2 runners per cylnder. The longer and smaller diamiter ones are always open and increase trque because of the high air velocity at low rpms. Then the shorter and fatter runners open once under turbo boost (~3000 rpms). This gets the high volumes of air movng easily for hi rmp power. I dont know if it worked flawlesley but in theory it would work perfect at getting more torque and hp (always good). And if you can put in on one engine what stops you from puting a system simmilar to this on a diffrent intake (tpi would be a perfect starting point). For a n/a motor you would wire it into your ecu or somehow so its reads your rpms and actuates the shorter runners valves to open up at high rmp.

http://cgi.ebay.com/ebaymotors/ws/eB...401061820&rd=1

Also ive been thinking would it work if you have a duel plentum manifold and have a large butterfly valve that opens at high rpms and allows air to go from one plentum to another. this would give you hi rpm power like with a single plane but torque and throtle resposnse of duel plane at low rpms.

 

The 32V Yamaha V8 that ford used in the late 90's Taurus SHOs had the same dual-runner intake. The few I rode in had amazingly flat power curves too, so apparently it does work as advertised.

 

Have you ever seen the LT5 engines used in the ZR-1 Corvettes? The engine was designed by GM and Lotus I believe. It had dual runners to each cylinder as well as over head cams. Pretty interesting stuff.

 

yes the ZR1 had duel runners per cylnder (one per valve) that not so special but looks good. Im taling about 2 runners to one common head port interchanging from one to another for torque and hp increase.

 

From my Corvette FI manual:

Is there an echo in here....?

 

The 32 valve 4.6L Cobra motor has dual runners, as does the Integra B18 going back at least as far as '94.

-Chris