Author Topic: 5 hp free! (Read 3218 times)

turboguzzi · « **on:** February 08, 2019, 02:46:58 PM »

from the school of "what the $%^& where they thinking?"

slikwilli420 · « **Reply #1 on:** February 08, 2019, 03:31:35 PM »

I saw someone saying they worked but cost around $200 each.

gschuld · « **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

bwaller · « **Reply #3 on:** February 08, 2019, 05:21:41 PM »

Pinhead always talked up "power lynz".

Tintop · « **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??

Korven · « **Reply #5 on:** February 09, 2019, 01:41:05 AM »

Looks like real fancy cupcaketins. Couldn't you run them thru a flowsim?

turboguzzi · « **Reply #6 on:** February 09, 2019, 03:39:34 AM »

Quote from: Korven on February 09, 2019, 01:41:05 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

bwaller · « **Reply #7 on:** February 09, 2019, 04:25:24 AM »

Throw you right on your side.

simon#42 · « **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 .

MRieck · « **Reply #9 on:** February 09, 2019, 06:16:35 AM »

I think variable length velocity stacks make more sense and actually work.

Tintop · « **Reply #10 on:** February 09, 2019, 07:36:05 AM »

Quote from: MRieck on February 09, 2019, 06:16:35 AM

I think variable length velocity stacks make more sense and actually work.

+1

simon#42 · « **Reply #11 on:** February 09, 2019, 09:01:43 AM »

they work for torque but are the first thing i take off racing superbike .

MRieck · « **Reply #12 on:** February 09, 2019, 09:07:18 AM »

Quote from: simon#42 on February 09, 2019, 09:01:43 AM

they work for torque but are the first thing i take off racing superbike .

https://www.google.com/search?q=variable+length+velocity+stacks&client=firefox-b-1&tbm=isch&tbs=rimg:CeMHS59etoQZImD5cwodkE21Z1Y4c0ckGDUKQyZ-hwT1mFdTfbU0dQ0mDb5J6inCBoxju16YkdnLF3FIj4-pNeSkQx_1rYQxZ_1W9B-nTS7bTQzgNkeNabF_1FjjZgagBWq1va_1p-HTQpSU4yQqEgn5cwodkE21ZxEpGMS63Uf-PioSCVY4c0ckGDUKEcfX_1aPKk1zBKhIJQyZ-hwT1mFcR6lugVSeiU3IqEglTfbU0dQ0mDRE3Z74uT5YZVCoSCb5J6inCBoxjESkYxLrdR_14-KhIJu16YkdnLF3ERY0ilDViyhd4qEglIj4-pNeSkQxEHakxPCRsxQSoSCR_1rYQxZ_1W9BEUG75Pi0cP4PKhIJ-nTS7bTQzgMRKRjEut1H_1j4qEglkeNabF_1FjjRFy9RwCEyn7KSoSCZgagBWq1va_1ESUhqDtHbZVAKhIJp-HTQpSU4yQRKRjEut1H_1j4&tbo=u&sa=X&ved=2ahUKEwj09ZKcka_gAhVHmeAKHfacCcoQrnZ6BAgBEBY&biw=2048&bih=954&dpr=2#imgrc=4wdLn162hBlzNM:
The Yoshimura set up is interesting

turboguzzi · « **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

Tintop · « **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

turboguzzi · « **Reply #15 on:** February 09, 2019, 04:02:24 PM »

for whoever is not fluent with japanese

https://translate.google.com/translate?sl=ja&tl=en&u=http%3A%2F%2Fwww.yoshimura-jp.com%2Fproducts%2Fengine%2Fdual-stack.php

Tintop · « **Reply #16 on:** February 09, 2019, 07:01:09 PM »

Uummm I just used the 'translate' button.

simon#42 · « **Reply #17 on:** February 10, 2019, 04:06:06 AM »

i find they make more max power with just the short bellmouth

turboguzzi · « **Reply #18 on:** February 10, 2019, 04:46:57 AM »

and doesnt it hurt a bit the low - mid range?

simon#42 · « **Reply #19 on:** February 10, 2019, 05:05:27 AM »

not really been looking down there yossef !

turboguzzi · « **Reply #20 on:** February 10, 2019, 09:16:30 AM »

good point! sounds more relevant for a street bike application....

eli · « **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?

turboguzzi · « **Reply #22 on:** February 12, 2019, 02:58:35 AM »

Quote from: eli 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?

"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

spotty · « **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

Don R · « **Reply #24 on:** February 17, 2019, 01:47:16 PM »

I have a facebook buddy that does a lot of cylinder head porting, he textures all of the surfaces he does.

https://www.facebook.com/speierracingheads/?eid=ARApmSZ7hcyQWnEBO08MzfCUnZMCk9aj94KSuL05Bn44osP80vuyiKcSw6_wFjv_-XOqseT0r71kUp_c&timeline_context_item_type=intro_card_work&timeline_context_item_source=1581881465&fref=tag

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Author Topic: 5 hp free! (Read 3218 times)