Today's Message Index:
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1. 07:00 AM - Re: 277 keeps falling off the pipe (slingshot003)
2. 07:10 AM - Kolb Plans Correction (slingshot003)
3. 02:38 PM - Re: 277 keeps falling off the pipe (Richard Pike)
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Subject: | Re: 277 keeps falling off the pipe |
Richard,
Is the exhaust a stock 277 exhaust pipe? If not, an improper taper in the tuned
section could be the cause.
Also, adjusting the midrange/full power jetting in your carb might help. I would
theorize that an overly rich mixture in the problematic throttle range could
produce those symptoms, but you say the egt numbers are good so that doesn't
seem likely. -Richard Swiderski
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=488658#488658
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Subject: | Kolb Plans Correction |
Kolbers,
A few weeks back, I said I spoke with Kolb about the getting the plans and builders
manual and was told they do not have any for the FS KXP. Well I spent some
time talking with Bryan Melborn at Sun & Fun, and he said they have plans
and manuals for all the models. -Richard Swiderski
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http://forums.matronics.com/viewtopic.php?p=488659#488659
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Subject: | Re: 277 keeps falling off the pipe |
slingshot003 wrote:
> Richard,
>
> Is the exhaust a stock 277 exhaust pipe? If not, an improper taper in the tuned
section could be the cause. -Richard Swiderski
Well, yes and no, I am starting to think no.
The original pipe was a curlyque like the one in the bottom left of the attachment,
but we wanted to try something to reduce the engine vibration, and I found
a supplier of tapered cones for people who are fabricating their own exhausts
and headers. Short version; got a cone that was exactly the right taper and
diameter at both the top and bottom when cut to the length as referenced according
to the top center pipe in the catalog. At 16 3/4" long, the top diameter
where it welds to the can is the same as the diameter of the opening in the can.
The diameter at the bottom (small end) is the same as the diameter of the 879-190
female joint connection.
Consequently I would have bet money that the straight section would be identical
to a stock Rotax pipe with that configuration, but I am starting to think it
is not.
Flew it twice last night, took a bit of pitch out of the prop each time, trying to compensate for it maybe being overpropped; this chart shows the correct prop diameter and pitch for a 277: http://www.ultralightnews.ca/articles/rotaxproprecommendation.htm
Since we are running a 62" two blade IVO, it seemed possible we are overpropped,
However I flew it twice more today each time taking out pitch, to the point
that you can't even give it full throttle or it will overspeed, and that was not
helpful, so I think I will assume it is not overpropped.
I think I weld the original curleyque pipe back on and see if it runs properly.
If that issue gets fixed, then I'll worry about the vibration.
Or sell it and get a different engine.
--------
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kolb Firefly Part 103 legal
Kingsport, TN 3TN0
Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing.
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