Author Topic: 5 hp free!  (Read 739 times)

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Offline turboguzzi

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5 hp free!
« on: February 08, 2019, 02:46:58 pm »
from the school of "what the $%^& where they thinking?"

:)



« Last Edit: February 08, 2019, 03:01:00 pm by turboguzzi »

Offline slikwilli420

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Re: 5 hp free!
« Reply #1 on: February 08, 2019, 03:31:35 pm »
I saw someone saying they worked but cost around $200 each.
All you gotta do is do what you gotta do.

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Offline gschuld

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Re: 5 hp free!
« Reply #2 on: February 08, 2019, 03:59:27 pm »
Looks like someone felt that adding a small bit of swirl to the intake flow into the carb throat would be a benefit.🤔.  Dunno, but it looks nifty😎

George

Offline bwaller

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Re: 5 hp free!
« Reply #3 on: February 08, 2019, 05:21:41 pm »
Pinhead always talked up "power lynz".

Offline Tintop

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Re: 5 hp free!
« Reply #4 on: February 08, 2019, 06:44:00 pm »
I wonder if you need a set with the opposite rotation if you are below the equator?? ;D ;D
1977 CB550/4 Cafe - Speed Warrior / BOTM 03/11
1980 CB750F (project)
Whittaker GBF Vintage Racing Sidecar (XS750 power) - ITG / 151's / CMR Racing Products (SOLD)
1976 CB400 SS - stock / BOTM 04/11 (SOLD)
1973 CB750 K - basket case (SOLD)
77 CB550 Cafe build
550/750 Filter Thread
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Offline Korven

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Re: 5 hp free!
« Reply #5 on: February 09, 2019, 01:41:05 am »
Looks like real fancy cupcaketins. Couldn't you run them thru a flowsim?

Offline turboguzzi

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Re: 5 hp free!
« Reply #6 on: February 09, 2019, 03:39:34 am »
Looks like real fancy cupcaketins. Couldn't you run them thru a flowsim?

no way, will make the program to crash for sure...
my main concern would be the torque reaction when you open the throttle :)

Offline bwaller

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Re: 5 hp free!
« Reply #7 on: February 09, 2019, 04:25:24 am »
Throw you right on your side.  ;D

Offline simon#42

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Re: 5 hp free!
« Reply #8 on: February 09, 2019, 04:25:45 am »
as the whole point of a bell mouth is to smooth flow into the carb these do surprise me !!
maybe the seller of these is right and everyone else is wrong though .

Offline MRieck

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Re: 5 hp free!
« Reply #9 on: February 09, 2019, 06:16:35 am »
I think variable length velocity stacks make more sense and actually work.
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Offline Tintop

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Re: 5 hp free!
« Reply #10 on: February 09, 2019, 07:36:05 am »
I think variable length velocity stacks make more sense and actually work.

+1
1977 CB550/4 Cafe - Speed Warrior / BOTM 03/11
1980 CB750F (project)
Whittaker GBF Vintage Racing Sidecar (XS750 power) - ITG / 151's / CMR Racing Products (SOLD)
1976 CB400 SS - stock / BOTM 04/11 (SOLD)
1973 CB750 K - basket case (SOLD)
77 CB550 Cafe build
550/750 Filter Thread
Sidecar Rebuild Thread

Offline simon#42

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Re: 5 hp free!
« Reply #11 on: February 09, 2019, 09:01:43 am »
they work for torque but are the first thing i take off racing superbike .


Offline turboguzzi

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Re: 5 hp free!
« Reply #13 on: February 09, 2019, 09:29:03 am »
+1, always thought is super smart, no moving parts, not that hard to DIY

zx6r had it from stock for some years, think around 2005

Offline Tintop

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Re: 5 hp free!
« Reply #14 on: February 09, 2019, 02:07:31 pm »
Interesting explanation of the 'dual stack' concept.  The fact that it is tunable peaked my interest.
http://www.yoshimura-jp.com/products/engine/dual-stack.php
1977 CB550/4 Cafe - Speed Warrior / BOTM 03/11
1980 CB750F (project)
Whittaker GBF Vintage Racing Sidecar (XS750 power) - ITG / 151's / CMR Racing Products (SOLD)
1976 CB400 SS - stock / BOTM 04/11 (SOLD)
1973 CB750 K - basket case (SOLD)
77 CB550 Cafe build
550/750 Filter Thread
Sidecar Rebuild Thread

Offline turboguzzi

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Re: 5 hp free!
« Reply #15 on: February 09, 2019, 04:02:24 pm »

Offline Tintop

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Re: 5 hp free!
« Reply #16 on: February 09, 2019, 07:01:09 pm »
Uummm I just used the 'translate' button. ;)
1977 CB550/4 Cafe - Speed Warrior / BOTM 03/11
1980 CB750F (project)
Whittaker GBF Vintage Racing Sidecar (XS750 power) - ITG / 151's / CMR Racing Products (SOLD)
1976 CB400 SS - stock / BOTM 04/11 (SOLD)
1973 CB750 K - basket case (SOLD)
77 CB550 Cafe build
550/750 Filter Thread
Sidecar Rebuild Thread

Offline simon#42

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Re: 5 hp free!
« Reply #17 on: February 10, 2019, 04:06:06 am »
i find they make more max power with just the short bellmouth 

Offline turboguzzi

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Re: 5 hp free!
« Reply #18 on: February 10, 2019, 04:46:57 am »
and doesnt it hurt  a bit the low - mid range?

Offline simon#42

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Re: 5 hp free!
« Reply #19 on: February 10, 2019, 05:05:27 am »
not really been looking down there yossef  !

Offline turboguzzi

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Re: 5 hp free!
« Reply #20 on: February 10, 2019, 09:16:30 am »
good point! sounds more relevant for a street bike application....

Offline eli

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Re: 5 hp free!
« Reply #21 on: February 11, 2019, 11:32:41 pm »
Don't know about those sea-shell-like stacks, but a friend of mine is a racing engineer, now in the VW-Paris-Dakar-team. He worked in Germany for a Opel-DTM-team once. I remember he told me that before he left them, he developed an intake with the inner surface covered with golfball-like dents AND littles holes spread all over. They shook their heads and put the whole idea away. Next season, Mercedes is suddenly so much faster and they find out about a special intake with holes in it! Guess who was back in the job at Opel with extra wages really fast?  ;D
Will my patience hold till the thing is finished???

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http://forums.sohc4.net/index.php/topic,171911.0.html

Offline turboguzzi

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Re: 5 hp free!
« Reply #22 on: February 12, 2019, 02:58:35 am »
Don't know about those sea-shell-like stacks, but a friend of mine is a racing engineer, now in the VW-Paris-Dakar-team. He worked in Germany for a Opel-DTM-team once. I remember he told me that before he left them, he developed an intake with the inner surface covered with golfball-like dents AND littles holes spread all over. They shook their heads and put the whole idea away. Next season, Mercedes is suddenly so much faster and they find out about a special intake with holes in it! Guess who was back in the job at Opel with extra wages really fast?  ;D
"golf balling" is a well known solution to decrease the boundary layer attaching to a surface, that's why you never should polish an inlet track, just taken to an extreme. back when i was into aeromodelling, we used to put similar "obstacles" on the leading edge of glider wings, aptly called "turbulators".
these "turbo" carb stacks seem to be more about vortex creation or something

Offline spotty

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Re: 5 hp free!
« Reply #23 on: February 12, 2019, 03:40:01 pm »
if anyone remembers the early BMW bike helmets they too resembled a golf ball, lots of little dimples across the surface, BM claimed it reduced turbulence at speed
It seems I've kicked the Honda habit again...anyone mind if I stick around ?

Offline Don R

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Re: 5 hp free!
« Reply #24 on: February 17, 2019, 01:47:16 pm »
« Last Edit: February 17, 2019, 01:57:45 pm by Don R »
If the things you own end up owning you, it's better to be owned by some cool things.

 

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