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PostPosted: Wed Aug 11, 2004 8:02 am 
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Joined: Mon Dec 15, 2003 2:40 pm
Posts: 22512
Location: Chicago
The intake and carb I am using is from a 580cc seadoo watercraft, the intake does not
match the snowmobile crank cases exactly, you can see the size difference in the photo
below.

Using a old set of cases I was able to bolt the manifold up to the cases then scribe a
line where the material needs removed to provide a better flow match and more
importantly ensure the rotary valve timing is phased correctly, with the Seadoo
manifold having a smaller intake openings the roof height was lower this affected
the timing of the rotary valve when the valve was opening to allow the fresh charge
into the bottom end the lower roof height required a delay before it started to flow
into the cases also with the floor of the opening higher it reduced the duration or
amount of time the rotary valve was open.


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rotax_rotary_intake.jpg
rotax_rotary_intake.jpg [ 129.82 KiB | Viewed 2898 times ]
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PostPosted: Wed Aug 11, 2004 8:09 am 
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Joined: Mon Dec 15, 2003 2:40 pm
Posts: 22512
Location: Chicago
Backcountry of Patriotracing.net http://www.patriotracing.net gave me the following advice on
Ziggys board.

"Measure degrees between the two lines scribed across top and bottom of the RV cover/intake

also the green area can safely be removed to gain more area and not alter the timing.

leave a fat radius (.250+) in the corners and DO NOT go any closer to the outside rim than is existing. Have to leave plenty material for the RV to ride on across the hole."


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rotax_rotary_intake_rev_MOD.jpg
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PostPosted: Wed Aug 11, 2004 8:11 am 
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Joined: Mon Dec 15, 2003 2:40 pm
Posts: 22512
Location: Chicago
You can see in the following pictures the miss match between the manifold and
cases is pretty big.


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Mvc-510f.jpg
Mvc-510f.jpg [ 56.48 KiB | Viewed 2902 times ]
Mvc-511f.jpg
Mvc-511f.jpg [ 55 KiB | Viewed 2902 times ]
Mvc-512f.jpg
Mvc-512f.jpg [ 57.32 KiB | Viewed 2902 times ]
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