Polishing intake manifolds

by Eugene Klimenko in General Tech Discussion 6 years ago

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Re: Polishing intake manifolds

by Ken Ryan » 6 years ago

Ken Ryan

28 360 928

I have no opinion as to whether or not the larger diameter crossover tube represents an improvement. I can, however, think of at least one reason Rotax might have opted for a smaller one. Perhaps Rotax feels that the smaller diameter crossover tube is preferable because a larger one masks effects of poorly balanced carburetors (or other problems). Maybe they *want* the engine to run poorly if the carbs are not properly balanced, because, perhaps, unbalanced carbs would cause other, more serious problems. Just a thought. (It also seems obvious that Rotax would have tested crossover tubes of differing diameters.)

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Re: Polishing intake manifolds

by Genival Pacheco » 6 years ago

Genival Pacheco

4 87 135

Thanks kenryan,

This is a discussion that is in this forum for a long time and until now no conclusive statement has been made.
As you wrote there are a lot of maybes that Rotax could explain to us.
Of course the carbs must be well Synchronized but minor deviations commonly seen in mechanical equipment coud be compensated

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Re: Polishing intake manifolds

by Eugene Klimenko » 6 years ago

Eugene Klimenko

12 74 1

When I was younger, I used to believe that in charge of large corporations or countries are always very, very smart people. People, who simply too smart to make simple mistakes.

Now, that I am getting older, and have seen plenty of mistakes in brilliant German or American engineering, or political decisions of our leaders = I don't think that way anymore!

I will stop and talk to them at Oshkosh, maybe they will explain pros and cons of installing large size balancing pipe. Just like everybody else, I like to think that in the process of developing this engine, they did tests with different tube sizes.

But on other hand, looks like at least one company in Italy did enough research to start making and selling kits to fix this problem.

P.S. another option is, to stop talking and wondering about it, and just install it by yourself. Just like I did. And feel results every time you start your engine.

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Re: Polishing intake manifolds

by Bill Hertzel » 6 years ago

Bill Hertzel

13 1.95k 7.97k

... I will stop and talk to them at Oshkosh, maybe they will explain pros and cons of installing large size balancing pipe ...

The problem with talking to them at Oshkosh is that "Rotax" is not there!
The Rotax Tent, and a large and fancy one at that, is supplied and funded by BRP-Rotax but manned by representatives from the various distributors in the US.

You do not get to talk to the Engineers, Designers, or Anyone from Austria.
You get to talk to the Marketing Reps from California, Florida, and Wisconsin.
No one is going to have a heavy Austrian accent.
If you are lucky you might get to talk to one of the repair techs.
Mostly you are going to get the company sales pitch and no one is going to say anything that does not Toe-the-Line with BRP-Rotax Company policy.

If you try to suggest that you can offer them an improvement to their products, they will smile, nod their heads, quietly listen, and politely thank you for your suggestions.
Been there, Done that!

But, by all means, visit the Rotax Tent.
See all the engine displays and new developments and enjoy the show.
Pick up copies of their latest glossy brochures.
But don't expect that they are going to want to contact you after the show to discuss your Mods.

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.

Thank you said by: Wayne Fowler, Eugene Klimenko

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Re: Polishing intake manifolds

by Garrett Wysocki » 6 years ago

Garrett Wysocki

1 572 1.45k

Well put, Bill. All big business is run by the CFO/accountants.

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Polishing intake manifolds

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