Differences in Yamaha Deflector Nozzles

[Speedling]

I polished the pumps iim my Exciter and got 0.

I polished the pumps in my 212ss and got the satisfaction of trying.

 

[swatski]

Just saw this thread, very interesting. I must admit that in all my testing I kind of ignored the steering nozzle. Other than using it to attach the wonderful Cobra ultimates+fangs of course!

I have done a lot of work on the venturi nozzle. The stock has a 85mm opening, and I have tested just about every size up to something like 92, at which point there is no more "meat" to work with. Dramatic differences those changes make, no doubt. A combination of volumetric control of venturi nozzle (with an adjustable cone such as Lucky 13), the size of the aperture, and pitch of the prop together make a pump with maximum performance, tuned to provide best speed AND hole shot. It can be done, there IS a sweet spot in these pumps, but it is a lot of work.

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[swatski]

I polished the pumps in my 212ss and got the satisfaction of trying.

That is my understanding, too. Polishing/blueprinting pump parts does not seem to do much to performance. Unless blueprinting to seal gaps -- that is a different story.

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[DCB-270]

I polished the pumps in my 212ss and got the satisfaction of trying.

Something to do on a cold winter day.

 

[DCB-270]

Just saw this thread, very interesting. I must admit that in all my testing I kind of ignored the steering nozzle. Other than using it to attach the wonderful Cobra ultimates+fangs of course!

I have done a lot of work on the venturi nozzle. The stock has a 85mm opening, and I have tested just about every size up to something like 92, at which point there is no more "meat" to work with. Dramatic differences those changes make, no doubt. A combination of volumetric control of venturi nozzle (with an adjustable cone such as Lucky 13), the size of the aperture, and pitch of the prop together make a pump with maximum performance, tuned to provide best speed AND hole shot. It can be done, there IS a sweet spot in these pumps, but it is a lot of work.

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Reminds me of adjust- a - thrust.

 

[swatski]

Reminds me of adjust- a - thrust.

Yes it is! the same concept as Wetwolf's cone, different design. Never tried one myself, I went with the Lucky 13 based on what I could find and read, and discussions with Jerry Gaddis. The L13 is extremely well developed, they really thought of everything.

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[DCB-270]

Never tried myself.

 

[Ronnie]

@DCB-270 and @Speedling , I read your responsive posts on polishing and decided never to polish mine or spend the money to have someone else do it. Thanks

 

[DCB-270]

Yes , I dremeled tool everything I could fund that wasn't smooth. Got nothing.

@DCB-270 and @Speedling , I read your responsive posts on polishing and decided never to polish mine or spend the money to have someone else do it. Thanks