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dmasys
Joined: 10 Dec 2011
Posts: 22
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 Posted: Sat Dec 10, 2011 9:54 am Post subject: 500 hours with no ignition boost |
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My RV-10 has been flying since 2007 with a factory new Lycoming IO-540 with Slick Mags. It always started well when cold, and was a little tricky to start when something other than cold (either some middle temperature or the classic hot start with fuel boiling in the injector lines). But is was all pretty workable until about 480 flight hours when it just would not fire up when flown just a few minutes to some middle engine temp between stone cold and very hot.
Pulled both of the mags and got them rebuilt at 500 hrs as part of the annual condition inspection, and discovered something I guess I should have picked up on five hundred hours ago: neither mag on the Lyc IO-450 D4A5 has an impulse coupling in it, though both of them have the collar that caused both me and several A&P's to guess that I had not one, but two impulse couplings. And the left Slick mag has the extra stud on it for attaching a SlickStart unit. (Of course, there was never the distinctive 'clack' of an impulse coupling, but what did I know -- perhaps Slick had some new silent technology hidden in those mag collars.)
Suffice it to say, my IO-540 now has a SlickStart that totally solved the starting problem, but I wonder how did this all fall through the cracks during the original build? Nowhere in Van's instructions from 2007 does it say that if you get a factory new IO-540 through them that you will also need to add a SlickStart to complete the firewall forward installation.
I'm guessing I am not the only RV-10 builder to whom this mini-revelation might apply. So if you've got dual Slick mags on an engine you bought new through Van's, there is an additional ignition accessory you might or might not have known to add to your build.
On the other hand, I did get a rather amazing 500 flight hours from a new IO-540 that was able to get going without any ignition boost.
-Dan Masys
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rv10flyer
Joined: 25 Aug 2009
Posts: 364
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| Posted: Sat Dec 10, 2011 11:45 am Post subject: Re: 500 hours with no ignition boost |
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You must have the fast turning lightweight starter and Odyssey pc925 battery like me. I wonder if your battery needs replacing. This would occur about now.
I really like my slick start. It will jump a good 1/2" gap to ground when I tested mine.
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Wayne G. |
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Bob Turner
Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA
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| Posted: Sat Dec 10, 2011 11:59 am Post subject: Re: 500 hours with no ignition boost |
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I'll admit, I made the same mistake. I discovered it when I first drained the preservation oil and turned the prop over by hand, and said, "Where's the click?". Only then did I research the mags and find they had retard breakers but no impulse coupling (actually, just the left mag). So I bought the Slick start then.
The paperwork from Vans is a little unclear; as I recall it says "Slick start recommended". No where did it mention that there were no impulse couplings, so that the Slick start was really required.
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Bob Turner
RV-10 QB |
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