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  #1561  
Old 3 Weeks Ago
MatHormell's Avatar
MatHormell MatHormell is offline
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swap over to E85 happening this weekend. Hope to have it dialed in pretty close by the race next weekend. All I can say it the jets are FAT!

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  #1562  
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Ah yes also had archtype360 (justin collier) make me a custom length 3D printed Novi-stack. He makes these for all carb makes now and in various lengths. Should have it next week, just in time for the race

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  #1563  
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Vohnsen Vohnsen is offline
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What the theory about a Novi stack?

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  #1564  
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Quote:
Originally Posted by Vohnsen View Post
What the theory about a Novi stack?

Sendt fra min EML-L29 med Tapatalk
Could explain it with a drawing a little better, but the whole idea behind it is a way to direct air to move into the void in the intake track normally caused from air moving around the single stack and flowing around that bend, causes an area of the intake to not fill because of air rushing around and hitting the back wall

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Thats not how that stack works at all.
Look up eductor
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Default Fog Horn

Quote:
Originally Posted by MatHormell View Post
.............
Hey,
I hope it works just fine.
Looks like a fog horn to me.
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  #1567  
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Quote:
Originally Posted by Turbo Sporty 48 View Post
Hey,

I hope it works just fine.

Looks like a fog horn to me.
Its realy nothing new, SA racing designed and built them from aluminum for a long time, he no longer is producing them, so luckily another racer/fabricator stepped up and designed one and 3D prints them. The shorter version is already being ran on alot of bikes, I just requested a special length one, becuse my mikuni spacing is different than the S&S carb they were built to be ran on. It for sure wont hurt anything, and hopefully can help pull more air in on the big end

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Quote:
Originally Posted by rocketmangb View Post
Thats not how that stack works at all.
Look up eductor
I'm aware of how they work, there is actually alot of theory involved in it, what I was getting at is air flowing past a conventional single element velocity stack at a 90 degree angle creates turbulence and a partial vacuum from the shrouding by the leading edge of the stack. This produces dead air zones near the entryway of the intake tract. Dead zones reduce carburetor air velocity and flow, causing a rich mixture at high speeds

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Here is the data for you as well

Air flowing past a conventional single-element velocity stack at a 90-degree angle creates turbulence and a partial vacuum from the shrouding by the leading edge of the stack. This results in dead air zones near the entryway of the intake tract. Dead zones reduce carburetor air velocity and flow, causing a rich mixture at high speeds. And the higher the vehicle's ground speed, the greater the problem




Novi's TwinStack eliminates dead air zones by directing the passing high-speed air stream smoothly into the carburetor's throat, evening out air distribution while increasing velocity and flow with a ram-air affect. The increased airflow requires a correspondingly richer carburetor jetting. Novi claims the TwinStack also reduces reversion impulses, resulting in a flatter fuel curve and more accurate air/fuel ratio for increased power throughout the engine's rpm range.



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Mat, good to see impressive results!

will be interesting to see if trap speed's increase with this stack.
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