View Full Version : Can the Tri-z it get enough air?
Just-Tri-It
11-11-2010, 08:27 AM
I want to pursue a thought that came up on another thread on the air intake volume because it got me to thinking about the air duct and the amount of air that can be delivered through it to the 38 carb to the cylinder. Is the stock tubing on the Z incapable of delivering enough air with a lid with the additional hole in it to get maximum performance from the 38. Or is the tubing to small no matter how many holes are in the lid to bring the 38 and the engine to its peak performance. The tubing is pretty large except at the elbow of the boot. If the stock tubing can't deliver the necessary volume of air needed then I am wasting mine time putting it back on the bike. Just sort of thinking out loud here.
:wondering
Thanks for any insight.
tecat-z
11-11-2010, 11:13 PM
I always shared the same feelings about the Tri-z intake system. But after meeting Ronnie, and seeing the Mantis in action at TF 05,06,07, and 10. It is very apparent the oem tri-z intake setup is up to the task. The 85 set up is more capable that the 86 style. The boxes are same, but elbow and tube differ. The Mantis has all stuff in place, but runs without the airbox lid. You can also drill and install round uni pop in filters before the filter on airbox to promote faster fill time. I was always amazed, and always looked closely to verify. The worlds fastest 250cc Tri-z ran a complete oem style air intake.
Billy Golightly
11-11-2010, 11:19 PM
The engineering and reality behind how air intakes work is actually quite crazy. Its a lot more about resonance than it is volume in truth. Yamaha has always experimented with resonance in the intake more than most manufactures (Boost bottles being an example). You can google "Helmholtz resonator" for an idea of what resonance of the intake does but more or less it can work like an expansion chamber of the exhaust, pressure waves when meeting an open area change to vacuum waves and then bounce back in the direction they came from. I feel quite strongly that technology and theory is what was behind a lot of the design of the Tri-Z airbox and intake arrangement. The Mantis actually has probably 90% of the airbox cut off around it, but as Ed says it uses all the OEM air ducting.
Bryan Raffa
11-12-2010, 12:16 AM
I will tell you it will get plenty of air..on a stock airbox setup... love the woohattttt...... tone it produces.. with no lid K&N ...UNI.. clamp on....no filter.. done it all.:twisted: its all in how you tune the carb to that motor...with that filter/setup.. got mine tuned to Run in the summer with no lid and pop the lid on in the winter,,I'm a firm believer that every bike is different.
tri-Z ripper
11-12-2010, 03:08 PM
running a stock air box no lid with a 38 on mine. revs to the moon when the jetting is right i would never take off my air box because of the type of riding i do
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