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OEM Carb Mods While You Are Saving For FCR Flatslides.

Started by koko64, June 08, 2015, 12:34:05 AM

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ducpainter

#15
June 09, 2015, 06:09:20 AM
I think I'd have done the same knowing what little I do about the subject.

The laminar flow thing on the downstream side is what really gets tricky.
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koko64

#16
June 09, 2015, 06:20:54 AM Last Edit: June 09, 2015, 01:18:42 PM by koko64
Yeah, I know a bloke in the 80's who polished the ports of his race motor only later having to tear it down to scuff up the heads. ;D
I hadnt my licence long and this guy was a racer who started explaining this stuff to me. He found out the hard way. It was like another language, I was pretty green and just learning  about, well, everything!
2015 Scrambler 800

ducatiz

#17
June 09, 2015, 08:21:16 AM
I wonder if there would be any advantage with a vortex shaped surface leading into the bell mouth?  Something to direct the incoming air in a pattern..
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"Yelling out of cars, turning your speakers out the window to blast your music onto the street, setting off M-80 firecrackers, firing automatic weapons into the airâ€"these are all well and good. But none of them create a merry atmosphere of insouciance and bonhomie quite like a revving motorcycle.

koko64

#18
June 09, 2015, 01:37:59 PM Last Edit: June 09, 2015, 01:39:34 PM by koko64
I really dunno. Modifying evidence of cost cutting is easier. What do you mean?

You got a pic of unmolested carbs?
2015 Scrambler 800

koko64

#19
June 09, 2015, 05:36:32 PM
Quote from: ducpainter on June 09, 2015, 05:16:47 AM
Actually...my stock carbs were gifted to another member that had a set on his SS that were acting up.

I'll never have to look at the inside of them again. ;D

Nibor has a set of stockers. I'll ask him to take a pic to show the hard edges on the slide and in the throat.

2015 Scrambler 800

Nibor

#20
June 09, 2015, 08:05:05 PM
I'll pass it on to Nibor and let you know when he gets back to me! :P

koko64

#21
June 09, 2015, 10:34:45 PM
When he tells you, let me know ;D
2015 Scrambler 800

koko64

#22
June 09, 2015, 10:39:22 PM
PM sent.
2015 Scrambler 800

koko64

#23
June 10, 2015, 03:43:56 PM Last Edit: June 10, 2015, 04:08:04 PM by koko64
Nibor came by last night with a set of stock carbs off Nugget and took some pics.

Examining the stockers, not only does the bellmouth to throat area transition have an angle from the front of the carb, but drops over into a lip or ridge because the carb is bored from the rear and the boring stops short of the bellmouth casting. You cant see it, but its quite pronounced when feeling it with your finger. That wouldnt help smooth airflow. I'm guessing that if the bore went through, they would have had to clean up the angle by hand, which costs. Like I said, built down to a price. You dont see that on Keihin or Mikuni performance carbs.

When cleaning up that area don't venture too deep and damage the bore and CV slide recess. Stay short of that area unless you are Jerry Branch. Im only suggesting the mods that shops have been doing since carbs were invented but are DIY. Just want to clean things up a bit and get a nice radius on transitions.

Thanks for your help Nibor.
2015 Scrambler 800

koko64

#24
June 11, 2015, 05:02:44 AM Last Edit: June 23, 2016, 02:03:41 AM by koko64


You can see how unfinished the stock carbs are to meet the price point.
The modified carbs aren't quite finished, but you get the idea.



2015 Scrambler 800

koko64

#25
June 11, 2015, 04:08:17 PM
Quote from: ducatiz on June 09, 2015, 08:21:16 AM
I wonder if there would be any advantage with a vortex shaped surface leading into the bell mouth?  Something to direct the incoming air in a pattern..

I Googled Vortex to get the Fluid Dynamics perspective rather than the Star Trek perspective. ;D

2015 Scrambler 800

MotoPsycho

#26
June 12, 2015, 07:58:11 AM
You guys are spelling it wrong.

http://www.vorteccyclone.com/what-is-it.html
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ducatiz

#27
June 12, 2015, 08:15:58 AM
Quote from: MotoPsycho on June 12, 2015, 07:58:11 AM
You guys are spelling it wrong.

http://www.vorteccyclone.com/what-is-it.html

that's interesting.

my thought was that it would enable a better mixture and "aim" the air flow.. no idea something like that existed.
Check out my oil filter forensics thread!                     Offended? Click here
"Yelling out of cars, turning your speakers out the window to blast your music onto the street, setting off M-80 firecrackers, firing automatic weapons into the airâ€"these are all well and good. But none of them create a merry atmosphere of insouciance and bonhomie quite like a revving motorcycle.

Dirty Duc

#28
June 12, 2015, 08:19:24 AM

ducatiz

#29
June 12, 2015, 09:02:27 AM
Quote from: Dirty Duc on June 12, 2015, 08:19:24 AM
Vortex generator testing:
http://www.popularmechanics.com/cars/a310/1802932/

That is not what I had in mind -- that adds an obstruction to the air intake.

I'm saying to shape the intake bell mouth sids in such a way as to have a vortex shape -- not add vanes to the center.
Check out my oil filter forensics thread!                     Offended? Click here
"Yelling out of cars, turning your speakers out the window to blast your music onto the street, setting off M-80 firecrackers, firing automatic weapons into the airâ€"these are all well and good. But none of them create a merry atmosphere of insouciance and bonhomie quite like a revving motorcycle.
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