Are ac delco spark plugs pre gapped9/20/2023 ![]() ![]() It is always best to check the gap against the manufacturer’s specifications. The incorrect plug gap for your engine can contribute to a high rate of misfires, loss of power, plug fouling, poor fuel economy and accelerated plug wear. What will happen if spark plug gap is wrong? Even with small variations in the factory set gap the ultra-efficient firing power design will compensate for those small variations. In most cases your Iridium Power plugs do not need to be gapped. For BMWs with V8, V10, or N54 or N63 engines, 37000 miles are the threshold before getting new spark plugs. In most modern BMWs, manufactured after 2010 with the N20 or N55 engines, it is required to change spark plugs every 60,000 miles. When should spark plugs be replaced on BMW X3?Įvery 60,000 Miles Your first 60,000 miles is a significant milestone that will require you to replace several important components, including your engine’s spark plugs, transmission fluid, and tires. Spark plug gap tools can be found at any auto parts store for a couple dollars if not less. So for the BMW they do not come pre-gapped but it’s nothing a gapping tool can’t handle. ![]() They should come pre-gapped but just check to make sure. ![]() If you’re stock, just use the gap that comes from the factory, which is around 0.03. The name "AC Delco", logos, and verbiage on boxes are the property of General Motors.24 Should you lubricate spark plug threads? What is the gap on BMW spark plugs? Copyright (C) 2004 by Padgett except for quotes from other sources. I wonder if now that regapping is allowed, you can spread a #3 to. In the future I will probably still buy Rapidfires but from now on will look at both the box and the plugs inside to make sure they are the "new improved" version. Note that the original Rapidfire was presented as a "Performance Spark Plug" (see fig 1.) Can see using up supplies but over two years later ?Įven more surprising was the new admonition on the box to regap the plugs Consequently I was surprised when the #14s came in two different boxes (plugs were all "new style" and according the AC Delco this meant they were all platinum). Well according to AC Delco any plug with the new tip (as on the right in figure 2) was the redesigned platinum plug. The change took place in late 2001 so in April 2004, you would think that all the plugs had changed. Had noticed the different electrode when I bought the #14s and so checked the ones coming out. Did not notice at the time because they were "pregapped" so did not require checking. The new design, which contains a tapered and columned center electrode with a platinum pad, continues to promote lower demand voltage and extends the life of the spark plug over conventional plugs."Įvidently when I replaced my plugs the previous time there were 3 oldstyle and 3 new style Rapidfires. ACDelco added a platinum tip to its RAPIDFIRE Spark Plug line, giving it longer life. When I bought the new #14s I found out what the difference was - in late 2001 Delco replaced the original Rapidfire "Performance" spark plug with a Rapidfire "Platinum" spark plug.įrom Repair Shop Product News September 2001 issue is this blurb: "ACDelco has achieved a new level of endurance in its spark plug offering with its redesigned RAPIDFIRE Platinum Spark Plug and the Professional Platinum Spark Plug. On examination the electrodes were of two different types: one that matched the original RapidFires and "something else". When I removed the existing #3s I found that we had not one but two different plugs.įig. This year I changed out the Magnavox ignition for a Delco Type II and decided to change from the. When I changed the spark plugs in our Bonneville a few years ago, I opted for RapidFires since it was a GM part and purchased the then-recommended #3 plugs with. The latter is important since as of, the AC DELCO web page still said "Per package directions, ACDelco does not recommend changing the gap because the RAPIDFIRE plug comes pre-gapped." No longer. Two things to note about the box: First the "tapered splined" electrode blurb and second the bit about "DO NOT REGAP". The plugs were introduced with a serrated electrode that was said to be the greatest thing since sliced bread - better MPG, smooter idle, more power, just like the Fish Carburator - and was quietly dropped a few years later. That said, in recent years GM has adopted the Microsoft technique of making signitficant changes to a part wihout bothering to tell anyone. Have used them on several cars without any problems. I have been a fan of RapidFire Spark Plugs ever since they were introduced. Observations on the AC Delco RapidFire Spark Plug ![]()
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