GSXR Carbs fixed my problem! (long)

[Geezer]

Originally posted by pgg
A true flatslide or smoothbore 34mm carb would be equal to a whopping 38 - 40 mm CV carb in flow rates. An XS11 with 34mm CV's would only need a 30mm flatslide carb at the most. I've run bikes (not an XS11 though) on smoothbores and, being honest, they were always a pain in the a**! They're not 'flexible' - more like on/off switches. The stock carbs on my XS11 have always performed brilliantly. Geez, those kwaka carbs would be different again, but give me CV carbs anyday.

I've hated every set of CV carbs I've had the displeasure of dealing with. From the fisrt set I encountered on a 1967 Honda 450 to the ones on my 240Z and XS11. They're fine from 1/4 throttle up but they suck in traffic.

I'll have to check the size on the KZ1000 carbs but I think they're 36mm. I also have a set of KZ900 34 mm carbs bot those are going on a KZ750 engine that I'm dropping into my KZ650. ;o)

Geezer

[stevec5000]

Eventually I'm going to fuel injection to eliminate the carb problem entirely. I picked up the complete F.I. setup from a GSXR600 on ebay that included wiring harness, fuel pump, computer and everything. The injection manifold is a nice fit on the 1100 but I can't use the computer since it requires cam and crank position sensors on the engine and I have no way to reprogram it for the 1100 so I'm going to get a Megasquirt computer to run it when finances permit.

[Bill]

pgg wrote:

A true flatslide or smoothbore 34mm carb would be equal to a whopping 38 - 40 mm CV carb in flow rates. ...give me CV carbs anyday.

Well, the stock GSX-R carbs are as flat as any carb, but they're still a CV design. The best of both?

XSively,

[pgg]

Hiclones - anyone tried them?

http://www.hicloneqld.com/

[ratbyk]

Hiclones

Just another type of "snake oil" as far as I'm concerned. Will do nothing for you except make your pockets lighter. Anything that impedes air flow through the intake track is going to cost HP.
"Spinning" air in the intake track could possibly provide a more thorough mixing of fuel and air providing better combustion but by doing this "mixing" there will be a reduction in how much air/fuel can flow reducing power.
Ken/Sooke
78E Ratbyk
82 FT500 "lilRat"

[Geezer]

Re: Hiclones

Originally posted by ratbyk
Just another type of "snake oil" as far as I'm concerned. Will do nothing for you except make your pockets lighter. Anything that impedes air flow through the intake track is going to cost HP.
"Spinning" air in the intake track could possibly provide a more thorough mixing of fuel and air providing better combustion but by doing this "mixing" there will be a reduction in how much air/fuel can flow reducing power.
Ken/Sooke
78E Ratbyk
82 FT500 "lilRat"

I couldn't have said it better myself. Every few years another company comes out with this stupid old idea. The last one I remember was called "Suarup" and they worked best in the trashcan. I think the original idea dates back to the 1920; it’s never worked and never will.

Geezer

[pgg]

Using intake air to spin a clunky steel fan - sure don't sound efficient does it.

[clarkcortez]

I agree. I used "swarups" in my XS1100 back in '79. Showed a slight reduction in fuel milage and no increase in power. They are still in my toolbox.

[chevy45412001]

v-max

doesn't the yamay v-max use some kind of air charger type thing on that model? i rode one before bone stock smokes the xs-xj NO problem what so ever. But at like 5,000 it's like throughing a switch,the tourqe just sanaps in even better than my XJ. Did i really say that?

[Geezer]

Re: v-max

Originally posted by chevy45412001
doesn't the yamay v-max use some kind of air charger type thing on that model? i rode one before bone stock smokes the xs-xj NO problem what so ever. But at like 5,000 it's like throughing a switch,the tourqe just sanaps in even better than my XJ. Did i really say that?

The Vmax used a valve that opens up at higer RPM to make 4 individual carbs act like a 4-barrel. ;o)

Geezer

[uk1.1s]

Carb alternatives

Must have posted this little nugget of information on a number of different threads over the time I've been here - but this should be a good forum to reach anyone interested.

Had a couple of conversations a few years ago with a guy here (UK) who used to drag race XS11's.

His mods included the use of Yam FZR 750 carbs, with different manifold rubbers. He didn't ever specify what he used to connect carbs to head, but it sounded like he had a friendly local breakers (bone yard) who let him try out a few alternatives until he got it right.

He found that rejecting with 140 mains was all that was needed to get things running nicely.

Brilliant posting Steve....and well done on the work getting the carbs on and the bike running well.

BTW - The UK drag racer also researched replacement ignition systems and got pretty decent running using a Dyna System for something like a GS1000, with a bit of machining of the centre pillar to fit (later engines without mechanical advance). That did away with all the problems the vacuum advance system gave him.

BTW #2 - he got some pretty impressive times hooking up a 535 Virago back wheel ...... tho' never let on how many spokes he needed to replace after every run

[Geezer]

Re: Carb alternatives

Originally posted by uk1.1s
Had a couple of conversations a few years ago with a guy here (UK) who used to drag race XS11's.

His mods included the use of Yam FZR 750 carbs, with different manifold rubbers. He didn't ever specify what he used to connect carbs to head, but it sounded like he had a friendly local breakers (bone yard) who let him try out a few alternatives until he got it right.

BTW #2 - he got some pretty impressive times hooking up a 535 Virago back wheel ...... tho' never let on how many spokes he needed to replace after every run

The FZR750 had the cylinders canted forward about 30 degrees and had downdraft carbs. I doubt he was using FZR carbs.

The 535s in the UK had wire spoke wheels? All the ones here had mags.

Geezer

[ROCCET933]

custom throttle intake system

ok i see all of this about carbs and such..
I race a 933 porsche that has a similiar
setup as the xs11. side draft webber setup with quad motorola coil set. Lots of power but alot of tuning every single race seems like. I also have a street porsche same series of car only fuel injected. the original throttle setup worked fine and i tuned it maybe once a year.. I recently turned it into a race car as well. I custom made an intake manifold and changed out my fuel injection system for a better flowing one. I also took the technology of the sidedraft and incorperated it into my manifold so i have 4 thottle bodies but kept the fuel injection.. the thing is much quicker response than the webber carbed car. I am about to do this same thing to my xs11. I have a design drawn up and will machine the manifold in a couple weeks depending on how busy we are at work.
if anyone has any information about after market systems or know any specs let me know asap so i can incorperate this into the intake system...
if this works like i believe it will i will post it at cost for and anyone will be able to purchase the unit.

[Bill]

There has been discussion of XS11 FI over the years. Try using the XS11.COM SEARCH feature and look up "FI" or "MegaSquirt". You'l find several threads.

Keep us posted on your progress!