REFLECTOR: Automotive Spark Plugs

[Brian Michalk]

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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