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Evilchicken0
Joined: 12 May 2010
Posts: 2996
Location: London
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 Posted: Wed Mar 07, 2012 10:09 pm Post subject: |
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I wouldn't be in such a hurry for the pipercross filters, the GSX-R carbs don't get on with them so well.
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Mako
Joined: 17 Dec 2011
Posts: 141
Location: Reggio Emilia, Italy
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| Posted: Thu Mar 08, 2012 11:18 am Post subject: |
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| Evilchicken0 wrote: |
| I wouldn't be in such a hurry for the pipercross filters, the GSX-R carbs don't get on with them so well. |
... well, this means money saving...
but when I look at the SB6 air box it seams a moped one instead of a lung for a 1100 displacement. 
... and in all the bikes I worked on the air box is the most annoying thing to reinstall. I dreamt to stock it in the garage 
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Honda CB450K1 - CB750K2 - CB500K1 - RC30 - Ducati 750SS - Bimota SB6 |
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oily
Joined: 05 Apr 2008
Posts: 4788
Location: worcestershire
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| Posted: Thu Mar 08, 2012 11:22 am Post subject: |
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My prediction...........
If you do not use the airbox, you may very well regret it 
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SB6 mk1 (project mega light, big bore)
Sb6 mk2 ( Big Bore)
Sb6 mk2 ( Restored)
Sb6R fighter
Sb6 or Sb7 WANTED |
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sapila racing
Joined: 14 Jan 2009
Posts: 67
Location: Athens, Greece
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| Posted: Thu Mar 08, 2012 3:36 pm Post subject: |
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| Evilchicken0 wrote: |
| I wouldn't be in such a hurry for the pipercross filters, the GSX-R carbs don't get on with them so well. |
I have them on my bike and they work fine with changed main jets.
Have you tried them?
Mako if you need info on jetting I can look up my notes. |
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Mako
Joined: 17 Dec 2011
Posts: 141
Location: Reggio Emilia, Italy
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| Posted: Thu Mar 08, 2012 5:38 pm Post subject: |
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| sapila racing wrote: |
| Evilchicken0 wrote: |
| I wouldn't be in such a hurry for the pipercross filters, the GSX-R carbs don't get on with them so well. |
I have them on my bike and they work fine with changed main jets.
Have you tried them?
Mako if you need info on jetting I can look up my notes. |
if you have some note about main jets, screw turns out and idle jets it could be helpful
btw, on the 1100 baby do the central cylinders run richer than the outer ones?
If I'll have some money remaining in the pocket I would try to thrash the airbox
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Honda CB450K1 - CB750K2 - CB500K1 - RC30 - Ducati 750SS - Bimota SB6 |
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oily
Joined: 05 Apr 2008
Posts: 4788
Location: worcestershire
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| Posted: Thu Mar 08, 2012 6:09 pm Post subject: |
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| sapila racing wrote: |
| Evilchicken0 wrote: |
| I wouldn't be in such a hurry for the pipercross filters, the GSX-R carbs don't get on with them so well. |
I have them on my bike and they work fine with changed main jets.
Have you tried them?
Mako if you need info on jetting I can look up my notes. |
Aris, if you've got them to work, I for one, would be very interested in what jetting you've used
Are there any hesitations or coughs through the rev range?
This sounds like the holy grail
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SB6 mk1 (project mega light, big bore)
Sb6 mk2 ( Big Bore)
Sb6 mk2 ( Restored)
Sb6R fighter
Sb6 or Sb7 WANTED |
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sapila racing
Joined: 14 Jan 2009
Posts: 67
Location: Athens, Greece
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| Posted: Fri Mar 09, 2012 11:24 am Post subject: |
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According to my notes the Main jets I used are 150. The originals where 127.
I didn't touch the needles or pilot jets.
The bike works fine from 3.500 until a little above 10.500 ,according to the speedo, where it hits the rev limiter I suppose. Up until 3500 it is a bit rough and unresponsive, but idle is good and stable. Above 3500 it clears and carburation is really good, without any hickups or flat spots that I have noticed.
I don't have a dyno graph, the jets where claculated by trial and error on the road.
On eother mod I made is with the fuel taps.
My bike doesn't have the original vaccuum operated fuel tap.
I have two separate fuel taps, one on the left and one on the right side of the tank. I have one fuel filter per tap and I have routed the fuel pipes to an on-off fuel switch that I have attached to s[pecially made metal frame on which the fuel tank sits.
When I had only one and installed a fuel filter I had fuel starvation problems when pushing the engine hard during trackdays or prolonged open throttle runs on the road.
I had a lot of trouble with the carbs as it had pods when I bought it. It never ran well with single pods and I bought a set of FCR41 carbs to put on.
In the meantime I tried the Pipercross filters and it ran so well that I haven't installed them yet!  |
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Ekku
Joined: 22 Feb 2012
Posts: 24
Location: Finland
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| Posted: Sat Mar 10, 2012 9:34 am Post subject: By the way... |
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When I replaced the float valves, I noticed that in my sb6 there is bigger main jets in the carburettors of the second and third cylinder. I do not remember the sizes, but i left everything as they were, just did the synchronizing.
I think the carburation is quite spot on, so why to modify?
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Evilchicken0
Joined: 12 May 2010
Posts: 2996
Location: London
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| Posted: Sat Mar 10, 2012 2:33 pm Post subject: |
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| sapila racing wrote: |
According to my notes the Main jets I used are 150. The originals where 127.
I didn't touch the needles or pilot jets.
The bike works fine from 3.500 until a little above 10.500 ,according to the speedo, where it hits the rev limiter I suppose. Up until 3500 it is a bit rough and unresponsive, but idle is good and stable. Above 3500 it clears and carburation is really good, without any hickups or flat spots that I have noticed.
I don't have a dyno graph, the jets where claculated by trial and error on the road.
On eother mod I made is with the fuel taps.
My bike doesn't have the original vaccuum operated fuel tap.
I have two separate fuel taps, one on the left and one on the right side of the tank. I have one fuel filter per tap and I have routed the fuel pipes to an on-off fuel switch that I have attached to s[pecially made metal frame on which the fuel tank sits.
When I had only one and installed a fuel filter I had fuel starvation problems when pushing the engine hard during trackdays or prolonged open throttle runs on the road.
I had a lot of trouble with the carbs as it had pods when I bought it. It never ran well with single pods and I bought a set of FCR41 carbs to put on.
In the meantime I tried the Pipercross filters and it ran so well that I haven't installed them yet! |
Hmmm ok - I knew about the pod filters being difficult and assumed the Pipercross was similar. Mine has a K+N cut to fit the original airbox.
If I hold the bike open for a while it will fuel starve - at least I think it's fuel starving
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oily
Joined: 05 Apr 2008
Posts: 4788
Location: worcestershire
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| Posted: Sat Mar 10, 2012 2:59 pm Post subject: |
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Thanks Aris but I think I'll stick with the airbox for the road. I kinda like it reasonable below 3.5k revs as well as above. Sounds good for track riding though
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SB6 mk1 (project mega light, big bore)
Sb6 mk2 ( Big Bore)
Sb6 mk2 ( Restored)
Sb6R fighter
Sb6 or Sb7 WANTED |
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oily
Joined: 05 Apr 2008
Posts: 4788
Location: worcestershire
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| Posted: Sun Mar 11, 2012 9:20 am Post subject: |
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| sapila racing wrote: |
The bike works fine from 3.500 until a little above 10.500 ,according to the speedo, where it hits the rev limiter I suppose. Up until 3500 it is a bit rough and unresponsive, but idle is good and stable. |
I've been thinking about this Aris and the trade off depends on how rough and unresponsive (?) it is below 3.5k. Junking the air box has always been the holy grail as it frees up space to re-locate the battery
Obviously, my bikes need to be used on the road so still need to be usable below 3.5k.
I suppose the big question is...........HOW rough and unresponsive below 3.5K?
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SB6 mk1 (project mega light, big bore)
Sb6 mk2 ( Big Bore)
Sb6 mk2 ( Restored)
Sb6R fighter
Sb6 or Sb7 WANTED |
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Evilchicken0
Joined: 12 May 2010
Posts: 2996
Location: London
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| Posted: Sun Mar 11, 2012 1:26 pm Post subject: |
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Mine has a rough spot at 4-4.5k where the cams come in (I'm guessing)
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Pompey
Joined: 31 Jul 2008
Posts: 2311
Location: Marlborough
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| Posted: Sun Mar 11, 2012 2:16 pm Post subject: |
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I ran the race pipes and stock everything else and had no complaints about power and was smooth all the way through. Its far better to have a linear power curve on a 4 stroke... Just open it up right thru the revs and keep it nailed. Its got the power, just open it up.
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Pomps
Bimota's Db2, Db5 ,Ducati's 851' 92, 888' 93, Honda blade' 93, Triumph speed triple' 07, kawasaki zxr 750 k1 |
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sapila racing
Joined: 14 Jan 2009
Posts: 67
Location: Athens, Greece
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| Posted: Sun Mar 11, 2012 7:03 pm Post subject: |
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| oily wrote: |
Obviously, my bikes need to be used on the road so still need to be usable below 3.5k.
I suppose the big question is...........HOW rough and unresponsive below 3.5K?
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It is usable enough below 4000, but let's just say that it isn't 100% perfect. It accelerates fine from standstill without even reving the engine, and it works fine, but after 3500-4000 it really changes and the game is on.
The feeling is like Evilchicken0 describes it, so I don't think that carburation is bad at low revs, it's just that it comes in perfect tune a little later.
Of course I don't know how it is with the standard airbox and everything, but I know it works fine like this for me and revs to the limiter outhout a hitch. The Pipercross filters are large twin foam filters, maybe this is the difference that makes them work.
I'm talking about these http://www.pipercross.net/motorcycle/applications.asp?m1=12&m2=90
I plan to ditsch the twin battery set up and install a Shorai or similar LiFePo4 battery in the room left by the airbox.
The twin batteries are around 4,6 kg, this one will be 560-730 grams depending on size and it fits easily.
http://www.shoraipower.com/s-233739-SB6.aspx
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brian
Joined: 22 Aug 2011
Posts: 3790
Location: Australia
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| Posted: Mon Mar 12, 2012 1:58 pm Post subject: |
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mmm, very interested to see how this one goes. would certainly be nice to relocate the battery
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'99 DB4 #104, '96 SB6 #1165, '94 DB2 J #652, '99 DB4 #088, '08 VTX1800, '93 ZXR750R M1, '95 ZXR750, '95 ZXR750 Race Bike, '94 CBR400rr NC29 Race Bike, '94 CB250, '49 BSA C10 250, '61 BSA A10 650, '89 ZXR750, '91 Ducati 851 |
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