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  #1  
Old 06-07-2020, 01:34 PM
rv6n6r's Avatar
rv6n6r rv6n6r is offline
 
Join Date: May 2007
Location: Gearhart Oregon
Posts: 391
Default Today's engine puzzler #2

I was inspired by David Harris's recent puzzler -- and who doesn't love Click and Clack? Here's my engine puzzler. Probably an easy one but I'm posting because it stumped me for a while, and perhaps some other engine-challenged folks like me can get some benefit. At the risk of getting beat up like David did, I'm not going to post the answer right away. But it will be later today or tomorrow, or as soon as someone gets it. If you're frustrated by that you can subscribe to this thread and you'll get the follow-ups in your inbox.

So here's the setup: at around 1400 hours the engine began having a hard starting issue. Mostly it would start right up but maybe 1 out of 10 times it would just crank and crank. I could get it started with some starter fluid (I know, not safe, but it did the trick).

This is an RV-6 with Lycoming O-360 A1A, cabureted, P-mag right side with aircraft ignition harness, traditional magneto left side, iridium lifetime plugs all around. I had the magneto serviced, adjusted the carb, checked the fuel screens & verified no water in the fuel, cleaned & gapped the plugs. Checked all ignition wires with no problems found. No change.

Then I listened to an EAA webinar by Vic Syracuse. Bingo!

The clues are there, if you know the answer write it on a set of James Aircraft RV-6 high speed fiberglass pressure recovery wheel pants and send it to me PO box [etc.] OR post it here :-)
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Randall Henderson
RV-6 / O-360 / CS, 1600+ hrs, 1st flight Sept. 1999
Outstanding Workmanship OSH 2000, Craftsmanship award AWO 2000
Airport committee chair & AOPA ASNV for Seaside, OR Municipal (56S), www.seasideairport.org
Donated August and November 2021
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  #2  
Old 06-07-2020, 02:32 PM
Hitt7A Hitt7A is offline
 
Join Date: Aug 2018
Location: Mount Vernon WA
Posts: 32
Default

Malfunctioning primer
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  #3  
Old 06-07-2020, 02:52 PM
rv6n6r's Avatar
rv6n6r rv6n6r is offline
 
Join Date: May 2007
Location: Gearhart Oregon
Posts: 391
Default

Quote:
Originally Posted by Hitt7A View Post
Malfunctioning primer
No primer installed. Should have said.
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Randall Henderson
RV-6 / O-360 / CS, 1600+ hrs, 1st flight Sept. 1999
Outstanding Workmanship OSH 2000, Craftsmanship award AWO 2000
Airport committee chair & AOPA ASNV for Seaside, OR Municipal (56S), www.seasideairport.org
Donated August and November 2021
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  #4  
Old 06-07-2020, 03:59 PM
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rv8ch rv8ch is offline
 
Join Date: Feb 2005
Location: LSGY
Posts: 4,300
Default ignition key switch

Bad ignition key switch?
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Mickey Coggins
http://rv8.ch
"Hello, world!"
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  #5  
Old 06-07-2020, 04:53 PM
rv6n6r's Avatar
rv6n6r rv6n6r is offline
 
Join Date: May 2007
Location: Gearhart Oregon
Posts: 391
Default

Quote:
Bad ignition key switch?
Don't have that either, just a starter button and two mag switches (actually a grounding mag switch and a P-mag switch). All working good.

Again, the clues are in my original description, not in any component I didn't mention.
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Randall Henderson
RV-6 / O-360 / CS, 1600+ hrs, 1st flight Sept. 1999
Outstanding Workmanship OSH 2000, Craftsmanship award AWO 2000
Airport committee chair & AOPA ASNV for Seaside, OR Municipal (56S), www.seasideairport.org
Donated August and November 2021
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  #6  
Old 06-07-2020, 05:10 PM
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Skid Skid is offline
 
Join Date: Jun 2006
Location: KBUU
Posts: 255
Default Plug Problem?

Do the Irdium plugs have screw on ends for the plug wires to attach to? I would believe that could cause that issue. Although you stated a convention mag on one side so that couldn’t be an issue for those plugs.
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IO-360 B1B
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  #7  
Old 06-07-2020, 05:14 PM
Taltruda Taltruda is offline
 
Join Date: Oct 2017
Location: Las Vegas, NV
Posts: 914
Default

He mentions that a spray of starting fluid will make it start, so I?m thinking the electrical and ignition systems aren?t the problem. I?ll guess that the carb bowl is draining out somehow..
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RV-4 flying…
RV-8 empenage finished 10-2020

Wings Started.. 11-2020
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  #8  
Old 06-07-2020, 05:21 PM
BobTurner BobTurner is offline
 
Join Date: Dec 2011
Location: Livermore, CA
Posts: 7,854
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Quote:
Originally Posted by Taltruda View Post
He mentions that a spray of starting fluid will make it start, so I?m thinking the electrical and ignition systems aren?t the problem. I?ll guess that the carb bowl is draining out somehow..
I agree, fuel problem. I?d guess a stuck needle valve (once engine starts with starter fluid the vibration frees the valve).
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  #9  
Old 06-07-2020, 07:14 PM
AaronG AaronG is offline
 
Join Date: Sep 2009
Location: Hartford, CT
Posts: 107
Default

Starts with starter fluid, so likely not electrical.

Starts with extra fuel added, so likely too lean.

My guess is in intake leak. Old intake gaskets or hoses?

Aaron
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  #10  
Old 06-07-2020, 08:00 PM
Boyd Birchler Boyd Birchler is offline
 
Join Date: Sep 2014
Location: IN
Posts: 254
Default

Failed induction tube gaskets or hoses.
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