REFLECTOR: Automotive Spark Plugs

[Brian Michalk]

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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