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I have bought several things off the GBC. My only complaint is it seems to always take awhile to get your order. I expect my order to go out the day it is placed or at the latest, the very next day. Anyhow, I will be ordering my plugs off there as I can't find anyone local that has them. I hate the waiting of online shopping. [IMG]i/expressions/demon.gif[/IMG]
the guys from JDM motors, the ones that are doing the group buy, sent me IK16's which he said are considerably better than the IK20's because one of the workers there put them in, who had the IK20's in before, saw a big improvement over the IK20s... i'll let you know in a little bit how it turns out...
He sent you the IK16s....I hope they sent me the right ones. I placed my order last week and I think they shipped out today. I specifically requested the IK20.....hmmmm
I just talked to the guys running that group buy and they told me to go with the 5303 instaed of the 5304 plugs. Different numbers, now I'm confused. Price was $48 shipped.
I wonder if the 5303 is a colder or hotter plug. I am also curious as to whether they are sold out of the IK20 and are recommending/shipping the other plug to fill the orders. strange
IK16...5303....HEAT RANGE IS 5 COLDER
IK20...5304....HEAT RANGE IS 6 HOTTER......ALSO AUTOZONE IN THE EAST SELLS THEM FOR $12.99 EACH...ALITTLE MORE EXPENSIVE BUT THEY STOCK THEM......FOR THOSE WHO HATE TO WAIT !
If you ride hard, fast, and in hot weather (conditions where the engine runs hot): Use a cold sparkplug (such as a W5DC).
If you ride easy (moderate to slow) and in cooler weather (conditions where the engine runs cold): Use a hot sparkplug (such as a W7DC).
If you are an average driver use the heat range indicated in your owner's manual or the above chart....I searched the web and found this explanation....it's for motorcycles but the priciple is about the same for cars....the rest is trial and error and the way you drive...many factors to concider. I'm not sure which denso plug I would go with. Sure would like to ask that guy that has tryed both so I could make a better choice....hope this helps you.
When a plug is rated as cold, this rating is NOT a indication of the intensity of the spark. This rating is a indication of how well the plug can transfer heat from the electrode itself to the head. A colder plug transfers more heat from the electrode tip to the head, therefore the business end of the plug,(electrode), is at a colder temperature PRIOR to the time the ignition attempts bridge a spark between the gap. If this colder plug is sooooo cold, (its relative), that the fuel mixture can't be vaporized from the surface of the electrode and insulator, (from the heat generated from the previous strokes fire), PRIOR to the application of the spark, the potential that is supposed to jump across the gap will bleed off by conduction thru the wet surface across the electrode and ceramic to the head. The result is a fouled plug. And the converse, a plug that is too hot will retain too much combustion heat and tend to pre-ignite the fuel mixture before the ignition fires. This is pre-ignition, and causes detonation.(very, very bad). Just a few seconds at the rpm we run will cause destructive failure of the engine.
