The Terrain Denali brings an exceptional level of style, power and refinement to the segment. All models include four-wheel disc brakes with StabiliTrak electronic stability control and traction control, as well as six standard air bags: dual frontal air bags, head curtain side air bags and pelvic/thorax seat-mounted side air bags. Terrain is offered in front-wheel-drive and all-wheel-drive models, in SLE and SLT trim levels, as well as the Denali. An available 3.6L V-6 engine with direct injection and continuously variable valve timing is SAE certified at 301 horsepower and 369 Nm of torque. The 2015 Terrain features power and efficiency highlighted by the standard Ecotec 2.4L four-cylinder engine with direct injection and camshaft phasing to optimize performance and fuel efficiency – enabling EPA-rated 7.3 L/100km on the highway (FWD models). Terrain Denali delivers an extra touch of luxury with exceptional style and the latest technologies. GMC Terrain remains a favorite in the compact crossover segment, introducing drivers to the brand’s Commands Respect design and features in a well-appointed vehicle. Dark Sapphire Blue Metallic and Cypress Green Metallic exterior color.If you are like me and don't want your plugs in there for a long time ( I change mine at +- 60K miles) the advantage is pretty much negated. So as you can see there are some advantages to using this type plug but generally it's up to the owner. Finally, any vehicle that has an extend plug change interval (say 100K miles, or more). A good example is the Equinox 3.0 where the intake manifold has to be removed for access to the plug. Additionally, any vehicles that have difficult plugs to change are also a great candidate for these plugs. These engines fire each plug on the off stroke in addition to the compression stroke so they get double the electrical wear. So what vehicles should have iridium plugs?Īny waste spark engine (think Dodge V-10) that has one coil servicing two plugs should have this plug. It should be noted that conductive resistance inside the plug is not a significant player in strong spark generation since you are already dealing with resistor plug wires (to cut down on radio noise and electrical interference of other sensitive under-hood systems). Additionally, since the iridium resists electrical wear the plug voltage can be somewhat increased for a greater spark potential, but shorting through the plug wire insulation limits the amount of voltage that can be applied. By comparison, a copper plug with a squared off electrode wastes some energy because the spark can't decide where to jump from and relies on a coronal discharge to generate the spark which is "wasteful". A small electrode will concentrate the electrons to that spot and enable the spark to more easily be generated. Since the center electrode resists spark erosion so well, the diameter of the tip can be reduced to a fine point. The longevity of iridium is one of the things that allows auto manufacturers to stretch plug changes to 100K miles, or more. The biggest advantage to using iridium in a spark plug is it's ability to not wear while operating in the harsh environment of a cylinder. Remember, iridium is a rare metal and today's price is $650 per troy ounce, (for comparison, platinum today was $933 per oz.) so they use as little as possible. Other than that, the construction of the plug is pretty generic. The manufacturer laser welds a tiny iridium wire onto the end of the center electrode. The iridium in the plug is limited to the cathode tip. They also can crow that they are because they producing low maintenance engines that those engines are of a higher quality.įirst, you should know a little about an iridium plug. The main one, in my opinion, is that the use of iridium plugs (along with other innovations) gives manufacturers "bragging rights" about reduced maintenance costs. Iridium has some properties that enhance the overall performance of the engine.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |