Sam, first of all, welcome back from your deployment. My family and I prayed
for your well-being while you were deployed. (I am assuming that you are back).
My 049 Revmaster heads use the small NGK 14MM spark plugs and they are working
just fine with plenty of power coming off of my 2100D Revmaster engine. .. and
my SDS electronic ignition.
On Wednesday, June 28, 2023 at 09:27:40 PM CDT, Samuel Spanovich via KRnet
<krnet@list.krnet.org> wrote:
Question for all the VW guru’s out there regarding dual spark plug setup,
specifically with AA Volkswagen cylinder heads.
After one year of use with single ignition (the same ones that made it across
the country with me for the gathering last year), I recently took my AA heads
in to get them machined for a second spark plug, in hopes of converting back to
dual ignition. I told the machinist originally to keep the same size plug as
the original spark plug (12mm x 3/4” reach).
However just before the machinist was supposed to perform the work, he informed
me that these particular heads (the AA ones) do not have enough metal up near
the combustion chamber and they are not thick enough to support a 3/4” reach
spark plug (he said he measured the width with calipers, and compared it to an
older MOFOCO cylinder head of mine, and the AA head was supposedly not as
thick.
I asked if it would be possible to machine the second spark plug port for
something smaller, such as a 10mm x 1/2” reach plug. He sounded like it would
physically fit, however he sounded a little hesitant about running that small
of a plug into a fairly powerful engine (~80 HP).
My question is whether or not it would be safe to have this type of setup (1x
spark plug 12mm x 3/4”, and a secondary plug 10mm x 1/2”). I was fairly
certain older VW heads accepted 14mm x 1/2”, so I was a little surprised when
the machinist said he wouldn’t think a 1/2” plug would suffice.
Any input would be greatly appreciated; just trying to make sure I’m not
missing something completely obvious here.
V/R
Sam Spanovich
Sent from my iPhone
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