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Author Topic: Fuel injection talk here...  (Read 23570 times)

Offline mike45

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Fuel injection talk here...
« Reply #25 on: January 18, 2004, 01:36:00 PM »
From Dodobird  
quote:
A smooth finish is desireable because it eliminates any build up in the intake, intake turns are what cause pooling of the fuel, and 90% of the atomization takes place in the cylinder by the squish bands and temps ect. The intake walls dont hurt to be rough for airflow because their is a boundry layer thats formed thats a few thousands of and inch thick. So smooth is best.This comes from 40yrs of airflow research and not BS. And no , I didnt do the research.  
That sounds like Branch. SAE research has found that a mirror finish doesn't improve airflow nor does a rough finish promote atomization probably for the reason Branch states that there is no movement on the walls.  
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Offline project260

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« Reply #26 on: January 18, 2004, 01:44:00 PM »
Gerry
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Offline ROB BUSH

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« Reply #27 on: January 18, 2004, 02:02:00 PM »
yes 10 in..used bell mouth
no on ex. but i will,and let you know..  
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Offline SPEED KING

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« Reply #28 on: January 18, 2004, 02:11:00 PM »
quote:
Originally posted by project260:
Gerry
Jerry Branch..right?
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Offline DarkFalcon

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« Reply #29 on: January 18, 2004, 03:11:00 PM »
quote:
Originally posted by mike45:
 
Quote
That sounds like Branch. SAE research has found that a mirror finish doesn't improve airflow nor does a rough finish promote atomization probably for the reason Branch states that there is no movement on the walls.
Both the smooth and polished ports allow the formation of slow moving air surfaces (boundary layers), though the boundary layers of smooth surfaces tend to be less lazy than those of polished surfaces. It is this "less lazy" feature that is said assist with atomization or reduced puddling and better deal with the "bad" turbulence created by velocity and pressure differentials arising from turns.
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Offline mike45

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« Reply #30 on: January 18, 2004, 03:30:00 PM »
Funny thing, Jerry was the one to advocate 28" for realistic #'s. I think alot of bike guys use 10" because they have small benches. A small Superflow doesn't pull anything. From what I've seen and men I know 28" is the benchmark:beechug:
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Offline project260

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« Reply #31 on: January 18, 2004, 03:51:00 PM »
You know whats funny Carpenter never uses his flow bench and he will tell you that, i guess when your good your good.    btw i know he doesn't like people to get that good of a view of his heads  
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Offline Yngve

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« Reply #32 on: January 18, 2004, 05:07:00 PM »
quote:
Originally posted by ROB BUSH:
joe i flowed his big valve head..2mm in. 1mm ex.
172CFM @ 420 LIFT !!!!!!!!THIS WAS ONE OF THE FIRST ONES HE DID.NEW ONES MIGHT BE A LITTLE BETTER?
Isnt 172@10 inces of water something like 340cfm@28 inces of water?

A stock Hayabusa flows something like 226@28 inches.   If it flows 340... naaa   It doesnt...
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Offline Busa for hire

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« Reply #33 on: January 18, 2004, 06:01:00 PM »
quote:
Originally posted by project260:
You know whats funny Carpenter never uses his flow bench and he will tell you that, i guess when your good your good.      

hell I let someone work from mine. I don't see how you could replicate it exactly anyways.  
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Offline SLEEPERBUSA

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« Reply #34 on: January 18, 2004, 06:48:00 PM »
quote:
Originally posted by project260:
btw i know he doesn't like people to get that good of a view of his heads  
If someone is gonna copy it, they aren't gonna do it from a picture.
They are gonna BUY 1 to copy.................I think?!?!?

Besides, I pay full price.
I bought it, it's MINE to do whatever I like.
 
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Offline nlr-swe

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« Reply #35 on: January 18, 2004, 06:53:00 PM »
No Yngve itīs more like 287cfm @ 28" of water.
28/10=2,8 and the square root from that = 1,67332
multiplyed with the cfm @ 10" of water.
Now this is with 35mm intakes, but still very
good. Oh by the way Yngve My head flowed more
than Yourīs ...hehe
/Christer
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Offline SPEED KING

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« Reply #36 on: January 18, 2004, 06:58:00 PM »
Hello Christer.....SEND CANDY ! ! !

J
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Congrats to Richard Assen 260.7

Offline X-boy

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« Reply #37 on: January 18, 2004, 10:09:00 PM »
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Offline project260

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« Reply #38 on: January 19, 2004, 07:12:00 AM »
he's gonna be mad      
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Offline blackmax

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« Reply #39 on: January 19, 2004, 07:23:00 AM »
Rob,
Thanks for the flow numbers. Get back to us with the exhaust numbers.
       Joe Hahn
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Offline SLEEPERBUSA

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« Reply #40 on: January 19, 2004, 02:22:00 PM »
quote:
Originally posted by project260:
he's gonna be mad              
 
He'll be ok.  

We all will.  
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Offline spdingtkts

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« Reply #41 on: January 19, 2004, 04:35:00 PM »
quote:
Originally posted by project260:
You know whats funny Carpenter never uses his flow bench and he will tell you that, i guess when your good your good.       btw i know he doesn't like people to get that good of a view of his heads  
What do you think this is, omerta?
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Offline gnd111

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« Reply #42 on: January 19, 2004, 10:07:00 PM »
quote:
Originally posted by *** -swe:
No Yngve itīs more like 287cfm @ 28" of water.
28/10=2,8 and the square root from that = 1,67332
multiplyed with the cfm @ 10" of water.
Now this is with 35mm intakes, but still very
good. Oh by the way Yngve My head flowed more
than Yourīs ...hehe
/Christer
That would be if the flow is linear....  Not all things are though...
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Offline mike45

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« Reply #43 on: January 21, 2004, 04:56:00 PM »
From Project 260  
quote:
You know whats funny Carpenter never uses his flow bench and he will tell you that, i guess when your good your good.
Well now I'm very confused because his website specifically states all their initial work is tested on a bench. It even shows a head set up in a picture. I sense bullshit.  
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Offline DarkFalcon

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« Reply #44 on: January 21, 2004, 05:57:00 PM »
I would tend to think "concepts" would first have to be validated by use of the flow bench and velocity probes. But, hell, what do I know.
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Offline mike45

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« Reply #45 on: January 21, 2004, 06:23:00 PM »
From DarkFalcon  
quote:
I would tend to think "concepts" would first have to be validated by use of the flow bench and velocity probes. But, hell, what do I know.
Yeah, one would think. But, hell, what do I know.  
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Offline project260

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« Reply #46 on: January 21, 2004, 09:10:00 PM »
If he comes up with a different head shape he might use it for shits and giggles.. He's hand ported alot of heads in his time, he'll be the 1st to tell you he barely uses it. Now traces a head at 1st, now thats on file. Then hits the switch, all heads identicle, no need to flow. Thats a 1/4 millond dallar machine he's got there. Hass 5 axis horizontal  
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Offline Busa for hire

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« Reply #47 on: January 22, 2004, 06:59:00 AM »
quote:
Originally posted by project260:
If he comes up with a different head shape he might use it for shits and giggles.. He's hand ported alot of heads in his time, he'll be the 1st to tell you he barely uses it. Now traces a head at 1st, now thats on file. Then hits the switch, all heads identicle, no need to flow. Thats a 1/4 millond dallar machine he's got there. Hass 5 axis horizontal  
that would explain why he's so damn expensive then.  
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Offline DaveO

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« Reply #48 on: January 22, 2004, 03:15:00 PM »
Joe,

174-176@.425...178-179@.450 Vs 158 stock@.425

120-121@.400 Vs 104 stock

Dave
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Offline mike45

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« Reply #49 on: January 22, 2004, 08:47:00 PM »
Was Rick pulling 10" or 28" for those #'s. His unit should pull 400CFM.
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