fly_tornado Posted October 13, 2017 Share Posted October 13, 2017 finally twin electrode spark plugs https://rotax-docs.secure.force.com/DocumentsSearch/sfc/servlet.shepherd/version/download/0681H000002YH7YQAW?asPdf=false Link to comment Share on other sites More sharing options...
sandman Posted October 14, 2017 Share Posted October 14, 2017 Why the change, is there more performance?. Link to comment Share on other sites More sharing options...
M61A1 Posted October 14, 2017 Share Posted October 14, 2017 Nope....the only thing they mention is a common spark plug for all Rotax engines. The twin electrode is irrelevant, they have switched from a 14mm plug to a 12mm plug 2 Link to comment Share on other sites More sharing options...
sandman Posted December 10, 2017 Share Posted December 10, 2017 I’ve also heard that the spark plug cap is different as well and a special tool has to be purchased to remove the plug from the cap otherwise you may break the porcelain on the plug, also heard the new 12mm spark plugs are $25 per plug Link to comment Share on other sites More sharing options...
spacesailor Posted December 10, 2017 Share Posted December 10, 2017 Cheaper than "platinum" (used in some Holdens) I think. spacesailor Link to comment Share on other sites More sharing options...
Downunder Posted December 10, 2017 Share Posted December 10, 2017 Nope....the only thing they mention is a common spark plug for all Rotax engines.The twin electrode is irrelevant, they have switched from a 14mm plug to a 12mm plug The new plugs (custom made Bosch) do feature twin electrodes but other than that are not Iridium or Platinum. They are fitted to new 912 series engines but are interchangeable with the NGK's I believe. $22 USD !!...ROTAX SPARK PLUG 297-656 from California Power Systems I see it as a pure money grab. They have said there is nothing wrong with the NGK's.... so I see no point in paying 5 or 6 times as much for no difference in reliability or performance. If anything, those running avgas, would see these plugs fouling faster in my opinion... It's even worse for 2 stroke owners as they change plugs more often. And it (was) lucky NGK BR8** plugs are very cheap... Just another spare parts rip-off that Rotax inflict on their customers.... 1 Link to comment Share on other sites More sharing options...
facthunter Posted December 10, 2017 Share Posted December 10, 2017 Smaller plugs will foul easier. There's plenty of room for the bigger ones that are current and more commonplace. Multiple electrodes have been around for nearly 100 years. There's never been any demonstrated advantage and they are nearly impossible to regap. Nev Link to comment Share on other sites More sharing options...
sandman Posted December 13, 2017 Share Posted December 13, 2017 I heard from a very reliable source that the new 582-17 series are on the boat heading our way. Link to comment Share on other sites More sharing options...
Downunder Posted December 14, 2017 Share Posted December 14, 2017 If I had one of these new engines, I'd be going over to the 912 ngk's when required. DCPR8E's or DCPR7E'S...... You could probably flog 1 set of the new plugs (unused) and buy 4 sets of NGK's.....lol. Link to comment Share on other sites More sharing options...
facthunter Posted December 14, 2017 Share Posted December 14, 2017 Why do you run resistor plugs? Nev Link to comment Share on other sites More sharing options...
Downunder Posted December 14, 2017 Share Posted December 14, 2017 Why do you run resistor plugs? Nev DCPR8E's? They are the Rotax specified plug (up until recently) for all 912 uls ( 100hp) engines. Link to comment Share on other sites More sharing options...
facthunter Posted December 14, 2017 Share Posted December 14, 2017 That may well be .to comply with radio interference laws in Europe. It's definitely NOT a good idea for aircraft engines generally. Similarly you wouldn't run resistor (carbon) leads. Nev Link to comment Share on other sites More sharing options...
jetboy Posted December 14, 2017 Share Posted December 14, 2017 I thought NGK plugs are prohibited for aircraft use (probably why Jabiru use them, along with the carbon leads to make the engines run quieter) Link to comment Share on other sites More sharing options...
facthunter Posted December 14, 2017 Share Posted December 14, 2017 I haven't heard of any particular "brand" of plug being excluded but the type should be looked at.. Way back One particular type of Champion plug was approved for the 130 HP (DH) Gypsy 1-C motors. for Aviation use.. Nev Link to comment Share on other sites More sharing options...
Downunder Posted December 14, 2017 Share Posted December 14, 2017 I thought NGK plugs are prohibited for aircraft use Every Rotax dealer worldwide will sell you NGK plugs. I have no doubt they are probably not the only component "not approved for aircraft use" by the manufacturer, in use in aviation engines. The old vdo oil pressure gauges were also specifically prohibited for aircraft use, but Rotax fitted them anyway... The enigma of manufacturer liability......Perhaps if you purchased from the engine manufacturer, that is ok, but from elsewhere it is not. Seems a bit silly though, for the exact same part..... And for Nev, leads are copper cored.... Link to comment Share on other sites More sharing options...
facthunter Posted December 14, 2017 Share Posted December 14, 2017 Copper cored is fine, and not too common to buy these days. With aircraft you can't be too careful. The ideal set up is have a low tension supply to individual coils near the plug. This covers higher altitude work as well. Shielded leads give radio suppression with the magnetos but have their own problems one being cost.. Nev Link to comment Share on other sites More sharing options...
spacesailor Posted December 18, 2017 Share Posted December 18, 2017 They look a tad smaller/lighter?. There are four to a 582 engine. So would be good for weight watcher's. spacesailor Link to comment Share on other sites More sharing options...
spacesailor Posted December 18, 2017 Share Posted December 18, 2017 Also, Will the new "Blue" head (14mm plugs) fit the Grey head motor?. As the grey head brigade are usually looking for weight saving. spacesailor Link to comment Share on other sites More sharing options...
Downunder Posted December 18, 2017 Share Posted December 18, 2017 The only difference between the new (mod 17) and previous model (99?) 582 head is the spark plugs. They are 12mm plugs, same as the 912. Link to comment Share on other sites More sharing options...
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