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View Poll Results: Have you replaced one or more of your RV8 engine control cables?
Yes, at under 500 hours. 10 29.41%
Yes, at under 800 hours. 8 23.53%
Yes, at under 1100 hours. 1 2.94%
I have never replaced my RV8 engine control cables 15 44.12%
Voters: 34. You may not vote on this poll

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  #11  
Old 04-05-2019, 04:15 PM
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edneff edneff is offline
 
Join Date: Apr 2007
Location: Oakland, CA
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Quote:
Originally Posted by Ironflight View Post
Ed - just a recommendation based on my own experience - they get really bad quick - if it?s taking two hands to get it ?off?, then ground the airplane now until the cable is fixed - you might only have one operation left.

Paul
Agree. I grounded it Sunday while I come up with a plan. Tried lubricating, no joy. Just need to decide which cable to order exactly.
Question asked by custom cable supplier:
Will the clamp sleeves need to be threaded????
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  #12  
Old 04-05-2019, 04:29 PM
Kyle Boatright Kyle Boatright is offline
 
Join Date: Aug 2005
Location: Atlanta, GA
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Quote:
Originally Posted by edneff View Post
Agree. I grounded it Sunday while I come up with a plan. Tried lubricating, no joy. Just need to decide which cable to order exactly.
Question asked by custom cable supplier:
Will the clamp sleeves need to be threaded????
Just buy the drop-in replacement from Van's. It is an $80 fix that will last years. I replaced my engine cables after about 15 years on the RV-6 and expect the current set to last that long too.
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Last edited by Kyle Boatright : 04-06-2019 at 06:33 AM.
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  #13  
Old 04-05-2019, 08:51 PM
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Ironflight Ironflight is offline
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Quote:
Originally Posted by Kyle Boatright View Post
Just buy the drop-in replacement from Van's. It is a $80 fix that will last years. I replaced my engine cables after about 15 years on the RV-6 and expect the current set to last that long too.
That?s what I did on the -8, and after adding heat protection, the cables have gone 1500 hours....

I used different cables on the -3, but modifying the -8 would have been painful after its was finished and flying.
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RV-8 - N188PD - "Valkyrie"
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  #14  
Old 04-06-2019, 09:26 AM
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Pilot135pd Pilot135pd is offline
 
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If you want to know if the heat is affecting them go fly the plane. I think that's what's happening to my throttle cable. On the ground it's stiff, but moves. Once I'm flying it moves super freely so I'm thinking the heat is softening whatever inside is binding the cable.
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  #15  
Old 04-06-2019, 11:10 AM
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Ironflight Ironflight is offline
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Originally Posted by Pilot135pd View Post
If you want to know if the heat is affecting them go fly the plane. I think that's what's happening to my throttle cable. On the ground it's stiff, but moves. Once I'm flying it moves super freely so I'm thinking the heat is softening whatever inside is binding the cable.
Careful - when it happened to me, heat made it worse, and while it operated on teh ground, it froze up on me in flight, and we couldn?t do an idle/cutoff shutdown at the end of the flight.
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Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
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http://Ironflight.com
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  #16  
Old 04-06-2019, 06:51 PM
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edneff edneff is offline
 
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Quote:
Originally Posted by Ironflight View Post
Careful -... heat made it worse, and while it operated on the ground, it froze up on me in flight, and we couldn?t do an idle/cutoff shutdown at the end of the flight.
My main symptom was the binding of the mixture cable when trying to pull it to idle cutoff. Had to use two hands to get it shut down.

Today I removed both the throttle and mixture cables... PIA! The prop cable is still working like a champ. The governor's on the back, so it's not close to the exhaust. I disconnected the throttle cable and worked it by hand and it was binding significantly, although less than the mixture. So it will be replaced as well.

I measured them and am ordering new Van's cables.
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  #17  
Old 04-07-2019, 01:36 AM
scsmith scsmith is offline
 
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Quote:
Originally Posted by edneff View Post
Question asked by custom cable supplier:
Will the clamp sleeves need to be threaded????
I think the answer to this is YES. The ends of the outer sleeves are threaded to hold them to brackets at the ends.
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  #18  
Old 04-08-2019, 09:17 AM
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RV8Squaz RV8Squaz is offline
 
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I had to replace my original green Van's cables at about 500 hours. I installed heat shields and fire sleeve on my throttle and mixture cables. At 1000 hours they became stiff again and I replaced them with custom McFarlane cables. They are still going strong at 1600 hours. They are three time the price of the Van's cables, but if they last me twice as long I'll be happy since replacing cables is such a pain.
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  #19  
Old 10-16-2019, 09:39 AM
gblanck gblanck is offline
 
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Here's the drawing for the custom throttle cable McFarlane made for me. I've been using it for quite a while now, no issues. The quadrant end length was a little different than the original Cablecraft/Vans cable, I had to find a shorter clevis fork to work in my installation, otherwise very happy with it.
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  #20  
Old 10-16-2019, 01:49 PM
scsmith scsmith is offline
 
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Location: Ashland, OR
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Quote:
Originally Posted by gblanck View Post
Here's the drawing for the custom throttle cable McFarlane made for me. I've been using it for quite a while now, no issues. The quadrant end length was a little different than the original Cablecraft/Vans cable, I had to find a shorter clevis fork to work in my installation, otherwise very happy with it.
Greg,
thanks for posting the order form for McFarlane. I am getting ready to order both a mixture cable and a throttle cable. Can you confirm the equivalent length of the standard Van's cable that this replaces? Is it a QT-60? I'm guessing because the sum of all the individual lengths is 60". I can't recall if the Van's cable lengths are listed as full overall length? Could you have specified different lengths so that the standard quadrant clevis fork would work? Did the threaded sleeve ends come with the same thread diameter as a standard Van's cable?

I put firesleeve on my original cables. The throttle cable failed after about 450 hrs. I installed a new Van's cable and did firesleeve + aluminum tape wrap + an additional heat shield. Now the mixture cable is failing at about 600 hrs.

Kyle, with an RV-6 or -7, the replacement procedure is easy enough that it makes sense to just keep buying the $80 Van's cables. On the RV-8, the replacement procedure is so difficult that I only want to do it once more. I am willing to spend the $300 or so for a McFarlane cable that will for sure last the life of the airplane instead of having to do a painful replacement every 500 hrs or so.
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RV-8 N825RV
IO-360 A1A
WW 200RV
"The Magic Carpet"
Hobbs 625
LS6-15/18W sailplane SOLD
bought my old LS6-A back!!
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