Now I am gonna hafta go pull a couple of plugs outta one cylinder of my great plains 2180 and see what they are.
jg On Thu, Jun 29, 2023, 10:59 Chris Gardiner <cgardn...@rogers.com> wrote: > Hi Sam > My dual plug VW 2180 from Great Plains has 14mm on top and 10mm on the > lower plugs. > Your guy is correct that there is barely enough material to add the lower > plugs. > This is my 3rd set of heads from GPAS and no problems with this set up > Chris Gardiner > C GKRS > 2180 VW 300 hours > > Sent from my iPhone > > > On Jun 29, 2023, at 08:20, robert7721--- via KRnet <krnet@list.krnet.org> > wrote: > > > > Sam, > > > > I am not sure what an "AA" head is, but I am sure they are all similar. > I purchased mine replacement heads at Great Plains and had the cylinder > head machine work done by them as well. > > > > https://www.greatplainsas.com/0154a-/-043-cylinder-head.aspx > > > > Then can do the dual spark plugs machine work. They can do 10mm, 12mm, > or 14mm no problem. You can actually mix the types; my recent set has 12mm > on top and 10mm on the bottom. > > > > 10mm is fine for our VW engines. > > > > Thanks, > > > > Rob Schmitt > > N1852Z (over 1000 hours) > > Lees Summit MO > > > > > > > > > > > > -----Original Message----- > > From: KRnet <krnet-boun...@list.krnet.org> On Behalf Of Samuel > Spanovich via KRnet > > Sent: Wednesday, June 28, 2023 9:28 PM > > To: krnet@list.krnet.org > > Cc: Samuel Spanovich <spanovich...@gmail.com> > > Subject: KRnet> VW AA Cylinder Head Dual Spark Plug Question > > > > 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 > > -- > > KRnet mailing list > > KRnet@list.krnet.org > > https://list.krnet.org/mailman/listinfo/krnet > > > > -- > > KRnet mailing list > > KRnet@list.krnet.org > > https://list.krnet.org/mailman/listinfo/krnet > > -- > KRnet mailing list > KRnet@list.krnet.org > https://list.krnet.org/mailman/listinfo/krnet >
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