![]() ![]() ![]() ![]() Neither is likely to apply to you, or anyone for that matter who doesn't know exactly which gap they want to run. TOPAZ laser iridium spark plugs: Best Overall: 9.9 Out Of 10: Check Price On Amazon: NGK laser iridium spark plugs: Best For Quick Starts: 9.8 Out Of 10: Check Price On Amazon: Genuine Honda Spark Plugs: Best For Smoothness: 9.5 Out Of 10: Check Price On Amazon: DENSO Iridium TT spark plugs: Best For Fuel Economy: 9. Or the other option is magneto ignition, again rare unless a purpose-built race engine, likes a big gap but will misfire at lower RPMs, where the engine's purpose isn't relevant (such as drag racing) or it's done for style reasons (hot rods, custom big motor / super-lightweight motorcycles). then maybe 0.32 might be more to the engine's liking. heat range to resist pre-ignition and fouling Pre-gapped and nickel plated threads. rare, these days even Big 3 motors have had electronic ignition since the 1970s as standard. Bosch Double Iridium Spark Plugs are engineered to deliver both high. If you happen to be running a points-style mechanical ignition. Your car will probably be just fine with it. Do not change the gap on platinum, iridium or twin tip spark plugs, as the fine electrodes may get damaged. Always use a special spark plug gapping tool to change the gap. With nickel plugs, especially with motorcycles, the gap may need adjustment. Spark plugs require a precise gap to ensure proper ignition of the air/fuel mixture, and gapping them requires appropriate tools for your vehicles specific. Use the pre-gapped plugs and stop worrying. Are Denso iridium spark plugs pre-gapped DENSO spark plugs are manufactured with a pre-set gap. Unless you have a highly tuned high compression race motor, the added value of that extra 0.14" isn't critical (it un-shrouds the spark a little, which in theory makes it easier to light the charge, but if you're not misfiring, which you should notice as roughness, it's lighting the charge just fine). I hope somebody will be kind enough to explicitly answer them. They also say that 'torque is one of the most critical aspects of spark plug installation and give numbers for both cast iron and aluminum cylinder heads. There are advantages to having as wide a gap as possible, but then again there is a line where you start to get misfires. They say that the plugs DO NOT come pre-gapped. the plugs will work fine with that gap, again with any modern electronic ignition. On the other hand 0.40 is not "too close". an electronic ignition in good condition should be able to cross about 0.60 with typical street vehicle compression ratios and maximum RPMs. I have driven 500 miles with these brand new spark plugs and the engine no longer has a rough idle and purrs like a kitten. 42 I ended up re-checking in slightly gapping to. Re-gapping (you should check, though) is not recommended as you may create cracks or actual breakage, now or sometime after installation.Ġ.54 is a fairly large gap for a modern OEM recommendation, but it's not out of the realm of practicality. I received these plugs and according to AC Delco‘s website it stated that the plugs were pre-gapped at. Iridium is a very hard, brittle material. ![]()
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