![]() Before installing new spark plugs, use a gap guide to make sure your new spark plugs have the correct gap.This grease also promotes a good heat transfer between the spark terminal screw and boot terminal. Apply dielectric grease into the boot area to reduce the chance of exterior tracking on the buttress tower of the spark plug.This will help identify and relate any unusual condition to the cylinder involved. Remove each spark plug and place each one in a tray by cylinder number.The heat of the engine, in combination with a spark plug that is still hot, may cause the spark plug threads to strip the cylinder head upon removal. NOTE: To remove spark plugs from aluminum heads, allow the engine to cool. Use the correct deep socket size to loosen each spark plug one or two turns.CAUTION: Use goggles to protect eyes from debris when applying compressed air to spark plug wells. Brush or air blast dirt away from the well areas before removing spark plugs.DO NOT grab or violently pull spark plug cables. If necessary, use a spark plug boot removing tool. Pull the spark plug boot and cable away from the spark plug. Grasp the spark plug boot and gently rotate it 90 degrees counterclockwise. ![]() Read Also: Ac Humming Fan Not Spinning Visually Inspect Spark Plugs For Signs Of Wear Follow These Steps For Removing Spark Plugs For Inspection Servicing Or Replacement: Bigger gap supposedly gets a tiny bit more power though. Then a lot of people set it to 35 even if it calls for 45, since its less wear on your ignition and slightly more reliable spark with a smaller gap. Re: AC Delco #5 Platinum Rapidfire Spark Plugs Sparkytfl The gap should be whatever the sticker under the hood calls for. Engine305 Standard Bore, 4BLL Edelbrock,.035? I was interested to hear what people thought about these plugs since I was thinking about getting them too. Anybody know why some auto parts web sites specify the #2 plugs with a. Re: AC Delco #5 Platinum Rapidfire Spark Plugs henryd3 I think the number is the heat range. Re: AC Delco #5 Platinum Rapidfire Spark Plugs 1ADan stock replacement for these cars appears to be rapid fire #2, any reason for wanting to use #5?as for the brand/quality, i’ve always had great luck with ac delco plugs in my cars, only other option i go with on my own stuff is NGK Re: AC Delco #5 Platinum Rapidfire Spark Plugs Re: AC Delco #5 Platinum Rapidfire Spark Plugs The structure of the spark plug affects the heat rating:Īc Delco #5 Platinum Rapidfire Spark Plugs Spark plugs with high heat dispersal are referred to as cold, while plugs with less heat-dissipating characteristics are known as hot. What Is Spark Plug Heat RangeĪ spark plugs heat range is the degree to which it disperses heat. ![]() A hotter plug such as the RC12YC street plug has a long insulator tip it holds more heat and tends to burn off deposits. The cold Champion C57HCX racing plug has a shorter insulator tip that helps prevent tip overheating and preignition in high-speed engines. Critical factors involved in choosing the correct spark plug heat range include: Spark plug heat range is the relative temperature of the spark plug’s core nose. A “cold” spark has a shorter insulator and retains less heat at the tip endbut if it’s too cold, deposits accumulate and eventually the plug will short out. But if there’s too much retained heat, the engine will experience preignition. It keeps more heat in the tip of the spark plug, which helps burn off combustion chamber deposits. ![]() Hot or Cold Plugs?Ī “hot” spark plug has a longer insulator that prevents heat transfer into the water jackets. ![]()
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