tooter's next manifold adventure...

[tooter]

Originally Posted by 1.5

Ive seen the TB spacer and those usually produce gains so id be excited to see how this does too. Have you thought of doing a tb as well tooter?

No.
Throttle body spacers don't actually do anything except slightly enlarge the air volume of the plenum. The CNC engineer at the design shop told me that once the intake runners are reading infinite (open space) at the entrances where they connect to the plenum, enlarging the plenum makes no difference.

In contrast, lengthening the intake runners themselves does alter the operating properties of the intake manifold by shifting the torque curve lower in the rpm range.






I'm pretty sure that a 2 inch thick Yaris spacer will yield results similar to the 2 inch thick Tacoma spacer as the two intake manifolds are of a similar design. I wanted to do a spacer for the tooter, but it already takes up almost all of the space in front of the engine.






Greg

[CrankyOldMan]

Originally Posted by tooter

No.
Throttle body spacers don't actually do anything except slightly enlarge the air volume of the plenum. The CNC engineer at the design shop told me that once the intake runners are reading infinite (open space) at the entrances where they connect to the plenum, enlarging the plenum makes no difference.

In contrast, lengthening the intake runners themselves does alter the operating properties of the intake manifold by shifting the torque curve lower in the rpm range.

Aah yes, the old Helmholtz resonator. I've always wondered what the plenum side of that equation is, since the only readily available information is about the neck/runner length and volume of the resonating body.

[tooter]

Ok... enough goofing around over the holidays. I'm back in the saddle again.

A couple of nylon blocks for two prototype tooter I.V spacers have been ordered along with the blocks to make more tooter II.VII spacers. They should be in next week.


Greg