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11-21-2011, 09:47 AM
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Join Date: Dec 2008
Location: na
Posts: 1,457
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Dan, is your eng/prop dynamically balanced? Didn't you have an exhaust crack too?
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11-21-2011, 10:48 AM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Quote:
Originally Posted by RV8R999
Dan, is your eng/prop dynamically balanced? Didn't you have an exhaust crack too?
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Dynamic balance wasn't done until about 20 hrs ago, as it was never a shaker. When we did balance the initial numbers were in fact small. The internals were balanced to within a gnats arse at BPE.
Did have a crack in the 4-into-one collector, and it's now running with a slight mod suggested by the vendor.
__________________
Dan Horton
RV-8 SS
Barrett IO-390
Last edited by DanH : 11-21-2011 at 10:54 AM.
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11-21-2011, 07:03 PM
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Join Date: Oct 2005
Location: Melbourne, Australia
Posts: 1,868
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Quote:
Originally Posted by RV8R999
Dan, is your eng/prop dynamically balanced? Didn't you have an exhaust crack too?
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It may well be that Dan's Plane Power alternator itself is not balanced. B&C alternators are individually balanced and I've never heard of this type of failure on a B&C.
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You’re only as good as your last landing 
Bob Barrow
RV7A
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11-21-2011, 07:35 PM
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Join Date: Nov 2010
Location: lake charles, La.
Posts: 699
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Maybe
Just a dab of strategically placed silicone would stop this type of vibration.
bird
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Bird
rv8 entire airframe at airport now, painting done, intersection and gear upper and lower fairings done, maybe order engine around first of year or before the next rate increase.
"to fly is a privilege that I am so thankful to God for"
http://www.mykitlog.com/tcb328/
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11-22-2011, 08:18 PM
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Join Date: Apr 2007
Location: Cedar Hill, Tx.
Posts: 159
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We had the same problem with ours several times. They replaced it for free every time but the alternator itself would break also. We are close enough to the factory that we could take it there and wait for it. But the frustration of failure and them always saying it was caused by the plane made us switch to a B&C. We had the engine balance checked and it is pretty close to perfect but they would not belive us. The straw that broke was when they said no more warranty. Have had no problems with the B&C but have not flown it much cause of other problems.
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member 1 of 6
Metal Feathers Club
RV 7 N706CB
1st flight Oct 18, 08
S/N 72847 tip 200HP CS glass IFR
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11-22-2011, 08:30 PM
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Join Date: Jun 2006
Location: 8I3
Posts: 3,564
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Before my -6 became a project again, I had a bit over 1000 hours on a Nippondenso forklift alternator and never had a moment of trouble with it.
Come to think of it, I've never heard of ANY failures with said alternator as I have a number of friends flying with one or very similar variations of ND alternators.
Just curious if anyone else has had problems with stock automotive alternators. Not counting the alternators Van's use to sell...those were junk.
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Please don't PM me! Email only!
Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
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11-23-2011, 06:54 PM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Well, a shroud arrived today.
The "new" shroud is aluminum, just like the broken one. There was a note in the box from Jan, the office manager at Plane Power, stating she was mistaken about the shrouds being steel on current production alternators. I find that odd given her first question Monday on the phone was "Aluminum or steel?". And this one has been previously installed on an alternator.
To prevent another failure I'll take two steps. First, a couple well placed dabs of silicone sealant should damp the vibrating cover. Second, the edge of the cover needs to be deburred just like any other airplane part. The old cover appears to have cracked exactly where I find a nice notch on the new one. It should have a label saying "Break Here"

__________________
Dan Horton
RV-8 SS
Barrett IO-390
Last edited by DanH : 11-23-2011 at 07:06 PM.
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11-23-2011, 06:59 PM
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Join Date: Mar 2005
Location: SE Florida
Posts: 1,499
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Dan,
If the new one breaks, just put a stock ND steel shroud on it and be done with it.
Charlie
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11-23-2011, 07:10 PM
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Join Date: Dec 2008
Location: Ontario, Canada
Posts: 464
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NP alt
Quote:
Just curious if anyone else has had problems with stock automotive alternators. Not counting the alternators Van's use to sell...those were junk.
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Bob,
Mine didn't make twenty hours and packed it in. On went the B&C and
fine ever since.
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11-23-2011, 07:42 PM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Quote:
Originally Posted by chaskuss
...if the new one breaks, just put a stock ND steel shroud on it and be done with it.
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Charlie, got a source?
__________________
Dan Horton
RV-8 SS
Barrett IO-390
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