New Velocity stacks

[Claviger]

The slow arms race to 275+ at the wheel continues.

The most recent addition is a finalaized, perfect fit V-stack. Look Ma no couplers, the stacks seal against the raised flange on the TB and there is no lip or gap internally.

These things are built like a brick *hit house, 100% infill with Carbon impregnated nylon.

They’ll be part of a new system, one that I hope will push me over the 275 mark with a filter in place, on 92 pump gas, no tricks, just power.

 

[alpental]

Those look great! Did you print them?

 

[Claviger]

Did someone say plenum? I know it looks like ass now, but, give it time. This is just the first step, laminate a general shape plug, test fit. Sand and polish the lamination, turn it into a mold, build high volume plenum with ramair provision that can fit a filter for the street.

Inspiration taken from the Ozclaw, but, you can see I definitely didn’t copy anything here. Epoxy is still hardening, can’t do anything further with it for 24 hours.

 

[Claviger]

Those look great! Did you print them?

I did not, I have them done by a guy with a very high precision and expensive machine. I’d have to buy like 30 sets to make buying a machine that can do the smooth compound curve fiscally viable, not something I plan on doing.

 

[Claviger]

Currently the Plenum is at about 7 liters of volume. It will grow some more as I shape and refine its contours, hopefully I can get it to 9.2 liters, a point at which I am very confident it will imrpove everything over peak torque.

It should be relatively easy to finish making the mold from here, just some bracing, filler and elbow grease. Then I’ll end up with a baby smooth inside, where it matters. Eterior finish is secondary to me but will be Carbon.

 

[gharger]

The slow arms race to 275+ at the wheel continues.

The most recent addition is a finalaized, perfect fit V-stack. Look Ma no couplers, the stacks seal against the raised flange on the TB and there is no lip or gap internally.

These things are built like a brick *hit house, 100% infill with Carbon impregnated nylon.

They’ll be part of a new system, one that I hope will push me over the 275 mark with a filter in place, on 92 pump gas, no tricks, just power.

Nice! My V-rod had plastic ones OEM. I have billet aluminum ones different lengths to match uneven length header pipes. V-stacks fit inside tall K&N filter.
Will be interesting to see what effect it has on the R3.

 

[Speedy]

The entry to the plenum is more important than you might think. Too big and the plenum becomes "open." Too small and it becomes restrictive, though the larger the plenum the smaller the inlet can be made. Don't get hung up on tuning to a resonance. Use reversion from valve closing events to your advantage by reflecting them into opening ones. This gives you several characteristics to use: volume, distance to reflective surfaces, and shapes. You have created one variable reflection based on the length and geometry of your v-stacks. Now think about the opposite of a v-stack on an opposing wall. (Think parabola.)

You can use simple microphones and a recorder to capture lots of data in various places in the plenum once you have the thing installed. Look at it with vibration analysis software to clarify how it is working and then tune from there.

 

[barbagris]

Now think about the opposite of a v-stack on an opposing wall. (Think parabola.).

But sir! - I don't want to - I need to sleep.

@Claviger - Sexy stacks. Not something I would usually say to a chap.

 

[Tal]

Oh...Oh...Oh...that's beautiful man...beautiful!

 

[leatal]

The entry to the plenum is more important than you might think. Too big and the plenum becomes "open." Too small and it becomes restrictive, though the larger the plenum the smaller the inlet can be made. Don't get hung up on tuning to a resonance. Use reversion from valve closing events to your advantage by reflecting them into opening ones. This gives you several characteristics to use: volume, distance to reflective surfaces, and shapes. You have created one variable reflection based on the length and geometry of your v-stacks. Now think about the opposite of a v-stack on an opposing wall. (Think parabola.)

You can use simple microphones and a recorder to capture lots of data in various places in the plenum once you have the thing installed. Look at it with vibration analysis software to clarify how it is working and then tune from there.

Funny you mention shape as the Carpenter intake has a smallish intake opening (3.5" x 4") which opens into a huge chamber then tapers into the throttle bodies. Could be my imagination but seems to provide a noticeable boost in power (at speed) over running straight filters without a plenum intake plus makes all the intake noises go away and provides a nice deep growl from the front. By the way, to Claviger, if what you are doing does not work, you are more than welcome to use my Carpenter intake as a plug for your form if you pay shipping and return it to me undamaged. I can send you pictures of it mounted if you wish.