REFLECTOR: Automotive Spark Plugs

John Dibble aminetech at bluefrog.com
Wed Oct 22 07:00:18 CDT 2008


That makes more sense.  I'll look for some 18 mm auto plugs.

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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