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| Batavus Encarwi Carburetors |
Page 3
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| Click on photos to enlarge. WARNING: These modifications are experimental. I take no responsibility in the accuracy or damage this information or modification may cause to you Bat. |
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The material below is an attempt to document the differences between the venturi and the atomizer tube on the S23 and the S22/25 Encarwi carburetors. From what I noticed the S23 and the S8A are the same carburetors, but are mated with different intake manifolds. Therefore, what is stated below for the S23 carburetor will also apply to the S8A.
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Notice hole in venturi cavity. Shallow cavity and shorter atomizer tube. |
No hole in venturi cavity. Deeper cavity, hence
longer atomizer tube.
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This shows the throttle valve installed in the carburetor. |
Throttle valve installed.
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You can see the relationship between the atomizer tube and the bore. |
Bigger bore and the relationship between the bore and atomizer tube is different. |
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| Notice the hole in the back of the atomizer tube on the S22/25. |
Next I'll be posting the modifications I made to an S8A carburetor. The problem with just modifying a carburetor is that what you do on the intake side of an engine has to be compensated for on the exhaust end. These work hand in hand together. I'm not really sure if there is a difference in the port timing between a 20 MPH engine and a 30 MPH engine, but I know that I have enlarged my exhaust port with good results. I had multiple cylinder jugs to play with and am not sure what I finally did right to make my current set up work. Port timing is where the real science of a 2 cycle engines performance can be improved. I used trial and error to achieve my set up and feel that I don't have any useful knowledge to pass along on this subject. Therefore you will never see any material written on this web site about port timing and the enlargement of the exhaust port. Sorry.
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