Velocity stack and more...
Road Captain
Joined: Mar 2006
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RE: Velocity stack and more...
ORIGINAL: GothMetalGuitarist
No it's cool dude. If you need help, PM me.
No it's cool dude. If you need help, PM me.
Kyle
Road Captain
Joined: Mar 2006
Posts: 663
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RE: Velocity stack and more...
Oh, and I know I am thread jacking but it seemed like you were done with it anyway..
j/k
I didn't get threw the whole read last night so maybe it say something about choosing jets. I did see where it listed the jets for the SE stuff. Are those pretty accurate for all intake set ups?
It also will probably make more sence once i start tearing into the bike.
j/kI didn't get threw the whole read last night so maybe it say something about choosing jets. I did see where it listed the jets for the SE stuff. Are those pretty accurate for all intake set ups?
It also will probably make more sence once i start tearing into the bike.
Road Warrior
Joined: Jun 2005
Posts: 1,334
Likes: 2
RE: Velocity stack and more...
I assume those are CFM #'s? Good stuff there!!
More flow numbers:
The stock Harley CV40 carburetor flows about 185 CFM (cubic feet per minute) when flow is measured at a pressure difference of 12 inches of water. All the Mikuni HSR series flow considerably more:
Stock Harley: 185 CFM
Mikuni HSR42: 213 CFM
Mikuni HSR45: 237 CFM
Mikuni HSR48: 270 CFM
You seem to want to run an air-cleaner that looks different than the ham cam, so this is mostly for other people reading this. If you have an old style SE air filter that came with a K&N filter but want more flow, then you can fit a 3" K&N filter for ~$40. I think stock the SE came with a 2" K&N, which is more than enough and should feed an engine all the way up to 100 rwhp.
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Road Warrior
Joined: Jul 2006
Posts: 1,351
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RE: Velocity stack and more...
Probably the easiest way to go about this, and if I had it to do again, I would have just bought the DynoJet rebuild kit. It's been awhile but I think I went with the pretty standard #45/#170 combo. My bike has great throttle response, no backfires/carb farts. I have a hi-flow AC and Exhaust system with no crossover pipe. Carb work on a scale of 1-10 I would say would be a solid 8 if you are new to working on engines. If you have some mechanical experience then I would rank just about everything shy of internal engine work as a 3-4. I haven't run up agains anything I couldn't handle yet. Most folks say that I have an above average learning ability so I am not sure that I am a good gauge.
If it were me, I would do it myself. But thats me. Nothing ventured, nothing gained.
If it were me, I would do it myself. But thats me. Nothing ventured, nothing gained.
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Road Warrior
Joined: Jul 2006
Posts: 1,351
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RE: Velocity stack and more...
ORIGINAL: 1200c
Yes, CFM. I wouldn't get too caught up in the numbers though because they do not specific how they were measured. Usually, you should be told something like in 12 inches of water. Furthermore, more CFM doesn't necessarily mean better. The time it becomes irrelevant is when you air filter flows more than the carb is able to flow. Buying a 400 CFM air filter won't help anything if you only have a 300 CFM carb.
More flow numbers:
The stock Harley CV40 carburetor flows about 185 CFM (cubic feet per minute) when flow is measured at a pressure difference of 12 inches of water. All the Mikuni HSR series flow considerably more:
Stock Harley: 185 CFM
Mikuni HSR42: 213 CFM
Mikuni HSR45: 237 CFM
Mikuni HSR48: 270 CFM
You seem to want to run an air-cleaner that looks different than the ham cam, so this is mostly for other people reading this. If you have an old style SE air filter that came with a K&N filter but want more flow, then you can fit a 3" K&N filter for ~$40. I think stock the SE came with a 2" K&N, which is more than enough and should feed an engine all the way up to 100 rwhp.
I assume those are CFM #'s? Good stuff there!!
More flow numbers:
The stock Harley CV40 carburetor flows about 185 CFM (cubic feet per minute) when flow is measured at a pressure difference of 12 inches of water. All the Mikuni HSR series flow considerably more:
Stock Harley: 185 CFM
Mikuni HSR42: 213 CFM
Mikuni HSR45: 237 CFM
Mikuni HSR48: 270 CFM
You seem to want to run an air-cleaner that looks different than the ham cam, so this is mostly for other people reading this. If you have an old style SE air filter that came with a K&N filter but want more flow, then you can fit a 3" K&N filter for ~$40. I think stock the SE came with a 2" K&N, which is more than enough and should feed an engine all the way up to 100 rwhp.
Don't you think though if the carb flow is capable of 185 CFM and I am under the impression that it is weighted at 1 atmosphere of pressure that it is possible to force more air through the carb? I am not a physics major but I do dabble a bit. I wonder what the numbers are based on... Maybe it's max pressure that the carb is capable of? And to sustain that pressure an AC thatt is capable of higher CFM could keep a steadier supply of air flow to the carb?
It probably all comes back to me trying different combos until I am happy. LOL. I do love to crunch the numbers though.
Grand HDF Member
Joined: Sep 2007
Posts: 4,122
Likes: 43
From: Boise Idaho
RE: Velocity stack and more...
The 3" air filter idea works, that is what I built for my bike I found it only recuired a little more work to build the whole thing from scratch and other than the cost of the K&N air filter was quite cheap.
The pictures show the set up with the stock ham can and the second picture shows the custom double wide ham can I built to cover the whole filter.
This thing will flow so air and there is enough room inside for a real velocity stack.
[IMG]local://upfiles/43689/A50518A785494941844154D9EDECEE97.jpg[/IMG]
[IMG]local://upfiles/43689/38D33EF259FA492D92848F3666DE0E55.jpg[/IMG]
The pictures show the set up with the stock ham can and the second picture shows the custom double wide ham can I built to cover the whole filter.
This thing will flow so air and there is enough room inside for a real velocity stack.
[IMG]local://upfiles/43689/A50518A785494941844154D9EDECEE97.jpg[/IMG]
[IMG]local://upfiles/43689/38D33EF259FA492D92848F3666DE0E55.jpg[/IMG]
Road Warrior
Joined: Jun 2005
Posts: 1,334
Likes: 2
RE: Velocity stack and more...
Don't you think though if the carb flow is capable of 185 CFM and I am under the impression that it is weighted at 1 atmosphere of pressure that it is possible to force more air through the carb? I am not a physics major but I do dabble a bit.
Here is another example using a forcewinder. The length, shape, etc of the forewinder is tuned so that is actually produces more power at a certain rpm range than just running without an air filter and the carb 100% open.
Also, you can't compare the CFM I gave for the air filters with the ones I gave for the carbs. The carbs were done in 12 inches of water. Nobody specified what the air filters were done in. You can't compare things measured differently. The same flow will air filter will produce lower or higher readings depending how you measure it (10 in, 12 in, 20 in).
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Road Warrior
Joined: Jul 2006
Posts: 1,351
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RE: Velocity stack and more...
Gotcha. 12 in of water must be the key for nominal usage then. I also understand the differences between the filters and carbs. Interesting that the Forcewinder balances the curve and pushes the bigger gains from 80mph to 100mph..To me when I look at this, I see that the FW is most efficient atmoving air from 50mph to 57mph and then again from 80-100mph. It must be aPITA getting air to behave through the entire power band. Silly turbulence! Would be great to see more of a comparison between different models of AC units.
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Road Warrior
Joined: Jul 2006
Posts: 1,351
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RE: Velocity stack and more...
ORIGINAL: jag1886
The 3" air filter idea works, that is what I built for my bike I found it only recuired a little more work to build the whole thing from scratch and other than the cost of the K&N air filter was quite cheap.
The pictures show the set up with the stock ham can and the second picture shows the custom double wide ham can I built to cover the whole filter.
This thing will flow so air and there is enough room inside for a real velocity stack.
[IMG]local://upfiles/43689/A50518A785494941844154D9EDECEE97.jpg[/IMG]
[IMG]local://upfiles/43689/38D33EF259FA492D92848F3666DE0E55.jpg[/IMG]
The 3" air filter idea works, that is what I built for my bike I found it only recuired a little more work to build the whole thing from scratch and other than the cost of the K&N air filter was quite cheap.
The pictures show the set up with the stock ham can and the second picture shows the custom double wide ham can I built to cover the whole filter.
This thing will flow so air and there is enough room inside for a real velocity stack.
[IMG]local://upfiles/43689/A50518A785494941844154D9EDECEE97.jpg[/IMG]
[IMG]local://upfiles/43689/38D33EF259FA492D92848F3666DE0E55.jpg[/IMG]
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