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02-06-2011, 12:17 PM
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Join Date: Dec 2010
Location: Greeley, Colorado
Posts: 199
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Spark plug life
Records show 500 hours on the spark plugs in the RV 320 I bought recently. They seem fine but in the interest of safety, is it time for new ones?
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John D. Artz, EAA 71811, 100+ Young Eagle flts
Adopted Dave's 6A
MXL Ultralight, only bleeding after 3 landings
Scorpion Two Helicopter, big mistake
PA-28 and 210E Centurion
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02-06-2011, 03:19 PM
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Join Date: Jan 2010
Location: Southern Michigan
Posts: 1,964
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Keep them gaped and cleaned regularly and test each one with an ohm meter whenever you remove one. Any that read above 5000 ohms, throw it out. Also if you ever drop one while handling it on a cement floor, pick it up at once and drop it again on purpose,,,,then throw it out. You should get engine TBO if cared for properly.
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David C.
Howell, MI
RV-10: #41686 Under Construction
RV-9A: #90949 Under Construction
RV-10: #40637 Completed/Sold 2016
Cozy MKIV:#656 Completed/Sold 2007
"Donor Exempt" but donated through Dec. 2020
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02-06-2011, 04:45 PM
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Join Date: Jan 2005
Location: NC25
Posts: 3,503
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The are good a lot longer that that.
Get a Go / No Go gauge and let that be your guide other than time in service as to good or not.  All the other good or not good factors still apply but if they pass the Go / No Go Gauge, I would keep using them and have for more than 1,000 hours.
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Gary A. Sobek
NC25 RV-6 Flying
3,400+ hours
Where is N157GS
Building RV-8 S/N: 80012
To most people, the sky is the limit.
To those who love aviation, the sky is home.
Last edited by RV6_flyer : 02-06-2011 at 04:46 PM.
Reason: add photo
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02-07-2011, 03:25 AM
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Join Date: Dec 2005
Location: Sydney, Australia
Posts: 427
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Quote:
Originally Posted by 9GT
Any that read above 5000 ohms, throw it out.
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Measured how? This might be a dumb question but is this measured between to center connection terminal and the tip or i it measured elsewhere.
OK with the go/nogo gauge - who said I was done buying new tools.
Doug Gray
RV6 flying... |
02-07-2011, 07:12 AM
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Join Date: Jul 2007
Location: Delta, CO/Atlin, BC
Posts: 2,389
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Gary,
What's the hole diameter? That tool seems like something fairly easy to make unless the hole is some funky size.
greg
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Greg Arehart
RV-9B (Big tires) Tipup @AJZ or CYSQ
N 7965A
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02-07-2011, 07:18 AM
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Join Date: Jan 2010
Location: Southern Michigan
Posts: 1,964
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Quote:
Originally Posted by Doug
Measured how? This might be a dumb question but is this measured between to center connection terminal and the tip or i it measured elsewhere.
Doug Gray
RV6 flying...
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Yes. One ohm lead probe needs to touch the metal contact inside the barrel of the plug where the harness contacts and the other lead to the center electrode. You may have to modify the probes plastic insulator to fit inside the plugs barrel. This is just a basic test to help weed out a definite bad plug.
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David C.
Howell, MI
RV-10: #41686 Under Construction
RV-9A: #90949 Under Construction
RV-10: #40637 Completed/Sold 2016
Cozy MKIV:#656 Completed/Sold 2007
"Donor Exempt" but donated through Dec. 2020
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02-07-2011, 07:56 AM
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Join Date: Mar 2008
Location: Texas
Posts: 1,378
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Rotax Plugs
Since ours cost less than $2 each at Napa, I just change em when I run out of stuff to do.
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02-07-2011, 08:29 AM
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Join Date: Jan 2005
Location: NC25
Posts: 3,503
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Quote:
Originally Posted by Greg Arehart
Gary,
What's the hole diameter? That tool seems like something fairly easy to make unless the hole is some funky size.
greg
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I have not measured the hole size. It also has a tapper (countersink) to it. Typically if you stop by the Champion booth at an air show, they will give you a gauge FREE.
__________________
Gary A. Sobek
NC25 RV-6 Flying
3,400+ hours
Where is N157GS
Building RV-8 S/N: 80012
To most people, the sky is the limit.
To those who love aviation, the sky is home.
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02-28-2011, 12:06 PM
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Join Date: Jan 2007
Location: Waterloo Il.
Posts: 7
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Quote:
Originally Posted by 9GT
Keep them gaped and cleaned regularly and test each one with an ohm meter whenever you remove one. Any that read above 5000 ohms, throw it out. Also if you ever drop one while handling it on a cement floor, pick it up at once and drop it again on purpose,,,,then throw it out. You should get engine TBO if cared for properly.
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A 320 would have aircraft spark plugs, which do not have any resistance, if you are using a resistance plug that is a different story, maybe with a modified ignition system???? |
02-28-2011, 12:37 PM
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Join Date: Aug 2007
Location: Wichita Falls, TX
Posts: 2,182
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Aviation spark plugs very well can be resistor plugs. In fact, most of them are resistor type. The "R" in the part number means resistor. See http://www.aircraftspruce.com/catalo...psprkplugs.php for details.
The nearly brand new UREM-37BY plugs in my Cherokee measure about 1000 ohms from the wire connector to the tip electrode.
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Neal Howard
Airplaneless once again...
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