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03-31-2009, 11:03 AM
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Join Date: Jun 2005
Location: Milwaukee, WI area
Posts: 2,967
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Which spark plugs?
How do I know which spark plugs I need? 
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Chad Jensen
Astronics AES, Vertical Power
RV-7, 5 yr build, flew it 68 hours, sold it, miss it.
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03-31-2009, 11:06 AM
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Join Date: Jan 2005
Location: Charlotte, NC
Posts: 1,523
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massive electrode (aviation)??? -37BY's and be done.. but you should determine if you need REM or RHM first 
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Radomir
RV-7A sold
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03-31-2009, 11:07 AM
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Join Date: Jun 2005
Location: Milwaukee, WI area
Posts: 2,967
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And I determine that....how? I have RHB37E's and REM40E's on hand...
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Chad Jensen
Astronics AES, Vertical Power
RV-7, 5 yr build, flew it 68 hours, sold it, miss it.
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03-31-2009, 11:24 AM
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Join Date: Feb 2005
Location: Huskerland, USA
Posts: 5,862
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Usually, the spark plug manufacturers have a guild you can use. I like the fine wire plugs, they seem to start better, and stay cleaner (less fowling).
Are you having a specific problem with the plugs you are using?
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RV-7 : In the hangar
RV-10 : In the hangar
RV-12 : Built and sold
RV-44 : 4 place helicopter on order. 
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03-31-2009, 11:51 AM
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Join Date: Jun 2005
Location: Milwaukee, WI area
Posts: 2,967
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Not using any yet...haven't started the engine...it just occurred to me that there are many options, and I haven't found a thread (or info on Spark Plug Annie's site) on how to choose spark plugs. There's info on each type, but how do I know what type I need? I don't think I need fine wire since I have Lightspeed on one side...
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Chad Jensen
Astronics AES, Vertical Power
RV-7, 5 yr build, flew it 68 hours, sold it, miss it.
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03-31-2009, 12:12 PM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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This might be....
Quote:
Originally Posted by cjensen
Not using any yet...haven't started the engine...it just occurred to me that there are many options, and I haven't found a thread (or info on Spark Plug Annie's site) on how to choose spark plugs. There's info on each type, but how do I know what type I need? I don't think I need fine wire since I have Lightspeed on one side...
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...a good starting point from Lycoming -
http://www.lycoming.com/support/publ...fs/SI1042Y.pdf
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Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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03-31-2009, 01:20 PM
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Join Date: Jun 2005
Location: Milwaukee, WI area
Posts: 2,967
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Thanks for that link Gil...looks like my REM40E's will work!
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Chad Jensen
Astronics AES, Vertical Power
RV-7, 5 yr build, flew it 68 hours, sold it, miss it.
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04-02-2009, 11:38 PM
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Join Date: Aug 2005
Location: Pasadena CA
Posts: 2,484
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R= Resistor, very good for avoiding radio interferance
E (H)=Wire end size small (Big, all weather)
M (B)=Reach short (long)
40 (XX)=heat range
E (S, BY)= Massive electrode (Iridium, Protruding)
All this is from memory, so I might have screwed it up. Depending on the size of your spark plug wire ends, you'll need either REM or RHM, suggest Massive electrode unless you foul plugs alot. SHORT REACH ONLY for your standard lyc.
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Stephen Samuelian, CFII, A&P IA, CTO
RV4 wing in Jig @ KPOC
RV7 emp built
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