REFLECTOR: Automotive Spark Plugs

[Brian Michalk]

John,

I checked the plugs today.  They are Autolite 386 plugs.

John Dibble wrote:
> I just called the auto store and they told me that 18 mm plugs only come in 1/2" reach.  Let me
> know when you verify your plug.
> 
> John
> 
> Brian Michalk wrote:
> 
>> Okay, I have no idea now.  I've gone through my email archive, and I
>> think it's an Autolite 18mm plug.  Which one?  I have not found it yet.
>>
>> Brian Michalk wrote:
>> ? I forgot to verify my plug type.
>> ?
>> ? I would be wary of getting a plug with too much reach (hotter).  1/2" of
>> ? thread seems too short, so I may be throwing out the wrong number.
>> ? Also, you do not need adapters with the 14mm plug.  They go right into
>> ? existing holes/threads.
>> ?
>> ? I pulled out my laptop with my inventory, and it only has the RHB32E's
>> ? on there.  I'm running the mag on the RHB32E's, and the electronic
>> ? ignition on the Bosch plugs.  I hope you can wait till Saturday.
>> ?
>> ? John Dibble wrote:
>> ?? Looks like I need to to more research.  Here's what I'm sure of:
>> ??
>> ?? Higher compression engines need a cooler spark plug.
>> ??
>> ?? Here's what I'm sort of sure of:
>> ??
>> ?? The next to hottest plug is about right for my 10/1 Franklin.
>> ??
>> ?? Here's what I don't know:
>> ??
>> ?? What reach the plug should have.  The aviation plugs have 3/4" of thread.  The adaptor
>> ?? adds another 1/4", so 1" of thread is needed to put the electrode at the same location in
>> ?? the combustion chamber.  Brian, the auto store cross referenced your Bosch plug to a
>> ?? Champion L86C (new # 306).  This has 1/2" of thread, so it is 1/2" short.  I am wondering
>> ?? if this can affect the compression ratio.  The guy in the store is concerned that it
>> ?? would foul.
>> ?? The other issue is the adaptor.  The ones I have, have 1/2 of thread, so a plug with 1"
>> ?? of thread will extend 1/4" past the adaptor.  Can this area foul with lead deposits and
>> ?? make removal difficult?  I'm thinking I will need an adaptor with 3/4" of thread.
>> ??
>> ?? Any comments?
>> ??
>> ?? John
>> ??
>> ?? Brian Michalk wrote:
>> ??
>> ??? I am using a Bosch 14mm plug on my Franklin.  Bosch W7AC, if I recall
>> ??? correctly.  I'll check when I get to the hangar.
>> ???
>> ??? John Dibble wrote:
>> ??? ? I plan to convert my Rose ignition (Franklin engine) to automotive spark plugs.  I
>> ??? ? currently use the same plugs as for the mag - Champion REB32E.  Anyone know or have
>> ??? ? ideas as to what plug to use?
>> ??? ?
>> ??? ? Thanks,
>> ??? ? John
>> ??? ?
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> 
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