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Z1300 Custom Intake Manifold | ||
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This page shows a new custom
made aluminum manifold designed to fit on all 6cyl Kawasaki 1300cc
engines. It's made to fit a single Weber 40 DCOE Carburetor in place of
our stock 3 two-barrel Mikuni carb setup. One of our members has made and tested
this intake on a Z1300, which is basically identical to the KZ1300. Technically, it might even work on a
Voyager 1300, or a fuel injected ZG1300, if you wanted to get rid of your DFI
system, but we'd have to try it out first to confirm that thought.
I've got a few pictures shown here of the prototype and he'll be sending more
soon. Things I know at this time are that you'll remove your airbox to fit it, but the
battery will stay in its current position. It will come as a kit with or without the carb as you wish, but with the custom 6 into one intake made from
aluminum, custom throttle cables, 2 air filter pods, gaskets, and bolts to mount
it.
If you want to buy a new Weber carb with the kit you can, but you'll be paying
some extra for it, than if you sourced it locally yourself. He says "The response on the bike is
unbelievable". It uses the 40 DCOE Weber Carburetor which I show below.
The reason to offer it without the carb is that you could probably get the best price on the carb by buying it off the "Weber Carburetors" ebay store which I link to below.
That way he doesn't have to buy a new carb and then resale it which would drive the
price up, and create a delay for him waiting on the carb to arrive. Estimated
cost for everything minus the carb is in the $500 USD range. It may be a little more once he starts putting all the parts together and sees his true cost with shipping, etc.
The question he has, is how many people are interested in buying one of these in the next few
months? He needs to know how many he can sell so he can judge how many to make, and then he'll be able to finalize a cost per unit more accurately.
He doesn't need your money up front, but he needs to know how many he can sell if he makes a batch of them.
So I need to hear from potential buyers, but only if you can commit to buy one
soon. Once we see about how many people can buy one, then we can get a
more accurate sale price than just "in the $500 USD range" as I quoted
above. I'll probably stock one kit myself. Propose any questions you may have on this, and I'll add a question and answer section to
this page, and we'll get all your questions answered. My first question is, does it improve the gas mileage, hurt it, or no change?
You can discuss it here or send me your questions direct to david@kz1300.com
Q: How does this setup affect our gas mileage?
A:
For this application, we'll use a Weber 40 DCOE carb, but
this carb comes in variants from 38 DCOE to a 50 DCOE size. The Weber DCOE (doppio corpo orrizontali) carburetor was extensively
used on:
1. Triumph GT6 and Triumph Spitfire:
2. Fiat 1100R (Rinnovato), Fiat 125:
3. Alfa Romeo Spiders (1300 junior, 1600, 1750, 2000, 2600)
4. and the Alfa Romeo 2600 Sprint used by the Rome police.
5. Porsche 911 T
6. Citroën DS 21
7. Lamborghini 400 GT lslero
8. The 1780 cc Ford Lotus Cortina
9. the Caterham Super 7
10. Lotus Elan
11. BMW 1800 Tl/SA
12. Aston Martin DB6 - Vantage
13. Maserati 3500 GT 34
14. Renault Caravelle 1100S
15. Lancia Flaminia 3C
16. Opel Rekord Sprint
17. Simca 1000 D/GLS, Simca 1500S
The two throats of the Weber DCOE can have synchronized butterfly-valves (like in the case
of the Weber DCOE 2) or differential butterflies. In the case of the differential Weber,
each body has to be tuned independently.
Transplanting a carburetor is not always as simple as you'd expect, and definitely not for the faint of heart. Experimenting with different jet sizes would be a starting point. It has a progression circuit and main circuit that govern the progression from idle to cruise to overtaking acceleration. Some creative matching of Idle Jet, Air corrector and Emulsion
tube would be called for to make a smooth transition. Tweaking the jetting may call for
adjusting the venturi jet, main jet, emulsion tube jet, air jet, idle jet, etc.
The big Weber 45 DCOE comes in Weber 45 DCOE 9 to Weber 45 DCOE 152 choke sizes. The
45 DCOE 152 offers a plastic float. The 45 DCOE 9 offers a brass float. Even that makes a
difference. Why? Changing the fuel level in the bowl will change the point that the main
circuit starts to feed, alter the characteristics of the emulsion tube, and affect both
drivability and fuel consumption.
In other words, you need to be an educated carb tech specialist. The expert carburetor tuner would use an air-flow meter
(AFM). An untrained street mechanic would be challenged by the engineering understanding, necessary. For ebayers: I've heard that when a Weber DCOE develops a vexatious air leak, people steam-clean it up and palm it off on eBay. Another thing to be careful about when buying a used Weber.
Here's some relevant Weber PDF files I made:
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