Z1 - Single carb mod

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30 May 2006 17:57 #50995 by FEF
Z1 - Single carb mod was created by FEF
All,

I'm thinking about trying to make an intake manifold, and use a single carb. I've found the room to make it happen. However, not wanting to re-invent the wheel (so to speak), I thought I'd see if anyone's done it.

My first swag has me thinking that I'd need a smooth 500CFM carb. I just don't know that I can get it to idle AND run at high RPM, though.

Any thoughts?

Anyone tried it?


Thanks,

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30 May 2006 18:00 #50997 by rstnick
Replied by rstnick on topic Z1 - Single carb mod
It's been done and worked! In the archives I believe there should be a post.

Here's one post by Milkman: Stromberg CD carb



Post edited by: rstnick, at: 2006/05/30 21:21

Rob
CANADA

Need a key for your Kawasaki? PM me

1978 KZ650 C2, 130K kms, Delkevic ex, EI, CVK32, PMC easy clutch, ATK fork brace, steering damper, Progressive Suspension, braced swingarm, ZRX shocks, 18" Z1R front wheel.
2000 ZRX1100
2011 Ninja 250R - Wife's
2005 z750s
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30 May 2006 18:10 #50999 by The Milkman
Replied by The Milkman on topic Z1 - Single carb mod
Here's a pic of the one I made for my 650, works fine.
Ride safe,
Les

had to make it smaller


Post edited by: The Milkman, at: 2006/05/30 21:14

78 650-C2, Stock engine, Jardine 4-2 Exh., 17-38 sprockets, dyna ignition and coils, coil wiring mod, carb mod.
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30 May 2006 18:15 #51001 by The Milkman
Replied by The Milkman on topic Z1 - Single carb mod
Thanks Rob,,, :laugh:

78 650-C2, Stock engine, Jardine 4-2 Exh., 17-38 sprockets, dyna ignition and coils, coil wiring mod, carb mod.

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30 May 2006 18:30 #51006 by rstnick
Replied by rstnick on topic Z1 - Single carb mod
No problem Les. You still runnin this set up?

Rob
CANADA

Need a key for your Kawasaki? PM me

1978 KZ650 C2, 130K kms, Delkevic ex, EI, CVK32, PMC easy clutch, ATK fork brace, steering damper, Progressive Suspension, braced swingarm, ZRX shocks, 18" Z1R front wheel.
2000 ZRX1100
2011 Ninja 250R - Wife's
2005 z750s

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  • wireman
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30 May 2006 21:24 #51045 by wireman
Replied by wireman on topic Z1 - Single carb mod
why?:whistle:

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  • Pterosaur
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30 May 2006 21:37 #51048 by Pterosaur
Replied by Pterosaur on topic Z1 - Single carb mod
wireman wrote:

why?:whistle:


Compliments to the people that made it work, but it seems to me that it'd be one giant leap backward to the carb and intake manifold setups from the old Indian, Excelsior and Henderson straight fours...

The whole point of a ported head and smoothbore carbs is to give the atomised fuel/air mixture the straightest possible shot at the combustion chamber. The less the flow is disturbed, the more efficient the transfer.

My guess would be that the setup would work moderately well up to cruising speeds, perhaps a bit more - but the swirls and eddies induced by those 90 degree bends in the manifolds would choke the bejesus out of it with a good, stiff wank on the right grip.

But it is an interesting looking and worthy bit of benchtop experimentation...

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31 May 2006 08:38 #51134 by FEF
Replied by FEF on topic Z1 - Single carb mod
First... Thanks for moving the post. ;)


Why? It's a fair question.

One of the main issues with the Z1-KZ engine, in my opinion, is carb sync. Over the years, I've spent too much time, even being good at it, tinkering on carbs. I'd love to be able to have one unit to rebuild.

It's great that there appears to be proof of concept. It's very exciting that it worked with a less then optimal intake. Clearly, the path to the center is better then the path to the outsides. But hay, it worked!!!!

The next step it to make the intake manifold that's more of a plunum type intake with equal runners. I'm thinking of making a down draft intake, that will allow a small auto carb. From this point, I'll have a lot of options. One option might be something like a ~400cfm 4bbl carb. I just might get the throtle responce I'm looking for at mid-power, if I can control the opening of the last set. I've seen some slick 2bbl carbs, a bit smaller, that open in succesion.

Assuming that the above works, EFI is the next step. assuming I can tune a small auto carb, then it should be failry easy to make an open loop Throtle Body (GM) EFI system work. At that point, it will be about the fuel map. IF I can get an O2 sencer in the 4:1 collector, I might even be able to make a closed system work. The EFI would be pretty sweet, but it will take a bit of time to tune.

It's an intresting project. Though, I still don't know where the ari cleaner will go. :P ;)


;) B)

Post edited by: FEF, at: 2006/05/31 11:41

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31 May 2006 16:22 #51240 by dnestell
Replied by dnestell on topic Z1 - Single carb mod
i saw a manifold for sale on ebay which used a single carb. it was a really nice cast chromed piece. the description said it was for a kz650 engine but used on a plane!!! if you look for custom plane parts i'm sure there is one around and you won't have to make a weird looking copper pipe fiting one. just thought you might want to know?

(no offense milkman, i actually kind of like the idea. it would look great on a ratted bobber or something?)

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31 May 2006 16:39 #51245 by kawtoy
Replied by kawtoy on topic Z1 - Single carb mod
Could you make the manifold from a turbo setup work? They use a single carb.

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  • Shoe48
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31 May 2006 17:26 #51259 by Shoe48
Replied by Shoe48 on topic Z1 - Single carb mod
That carb looks like a SU off a late Model MG or Triumph ?? I worked in a British sports car garage many years .. I saw that 650 manifold too , I thought it was a slick looking thing ,,I was always told that the Old Skool to the Best carb set up was mutipules ... I agree that you wouldnt thing the airflow to the outside two Cyl. would be all that good ,, But then Car manifolds ? and how the carb sits in the middle ??? anyway ,, Just throwing in my 2 cents ;)

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31 May 2006 17:47 #51260 by 77KZ650
Replied by 77KZ650 on topic Z1 - Single carb mod
kawtoy wrote:

Could you make the manifold from a turbo setup work? They use a single carb.

just get the whole turbo kit while youre at it:evil:

but more on topic, maybe some old 4-1 pipes cut up would work, just sort of mirror the exhaust pipes for an intake. only shorter lol, but i would think the collector might come in handy...

Post edited by: 77KZ650, at: 2006/05/31 20:51

07 MDP Rookie of the Year
01 ZX-12R street/drag bike. 8.97 @155.7 pump gas, dot tires, no bars, no power adders. top speed in the 1/4: 161MPH

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