Mark, Don, I've got the Great Plains heads on my Revmaster 2100D engine.
>From a few years ago, Steve Bennett told me to use a "Bosch 7904 or cross over equivalent" but that was for my 14mm thread setup. You'll need to use the equivalent in 10mm. I think if you want to go automotive type, you should be looking for 14mm not 10mm. This is actually much harder than you think it is when you go into an automotive store - the clerks only know how to look up a car plug from a specific model - they can't tell you anything else nowadays. You'll need to figure the plug model out using a spark plug catalog before you go to the store. The other odd thing was that the reach on the top side spark plugs was closer to a 0.7" vs a 0.5" on the bottom. I'm sure I ended up using the 3/4" reach plugs all around. I converted my Bendix Dual magneto setup to fire automotive plugs a couple years ago. It works great. http://www.robert7721.com/vwenginerebuild.html Thanks, Rob Schmitt N1852Z KR2S 816-309-0099 -----Original Message----- From: KRnet [mailto:krnet-bounces at list.krnet.org] On Behalf Of Donald Laverick via KRnet Sent: Wednesday, December 9, 2015 12:38 AM To: KRnet <krnet at list.krnet.org> Cc: Donald Laverick <dm.laverick at bigpond.com> Subject: Re: KR> GPASC dual-plug 10mm plugs? Sent from my iPad On 15 Jun 2015, at 2:25 am, Mark Langford via KRnet <krnet at list.krnet.org> wrote: I'm about to install a pair of Great Plains dual-plug heads on my 2180cc VW engine. Anybody know what make and model of 10mm plugs folks are using for the secondary plugs? I'm tearing the engine down anyway, since I found a broken cylinder stud yesterday, among other things. I noticed the broken stud while working on a new "performance" website for N891JF (http://www.n56ml.com/n891jf/performance/), and noticed the CHT for cylinder #4 wasn't even registering. After the stud broke, the nut backed off and the CHT ring was just floating around in space. See http://www.n56ml.com/n891jf/performance/ for that shot. I'm thinking Megajolt or Megasquirt to fire these plugs. Given that I have injector bosses on the intakes, I may just have to go Megasquirt. Either of these will manage spark based on load and MAP, so advancing the ignition at high altitudes could yield some real efficiency increases. Megajolt's not very expensive either...something like $170 for the controller, and it uses inexpensive Ford EDIS components that came on millions of 90's Ford cars and trucks. Don't forget my spark plug question. Plug wire info would be good too. Thanks, -- Mark Langford ML at N56ML.com http://www.n56ml.com _______________________________________________ Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org please see other KRnet info at http://www.krnet.org/info.html see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options _______________________________________________ Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org please see other KRnet info at http://www.krnet.org/info.html see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options
