Power-wise, couldnt tell ya. Performance Ideas :-* Aftermarket Parts. Side-gapping! My concern was if the side gapping exposed the spark in the combustion more it might encourage spark blowout in a forced induction engine. side gapping plugs ... it really works performance & modifications ... i know its only a butt dyno crap but hey it does have a good amount more kick. Brisk High Performance and Racing Spark Plugs comparison vs. OEM Spark plugs, testing done in cooperation with Honda of Houston. Side-gapping your spark plugs. If you want to see for yourself, google serach "side gapping to reduce spark blowout". Then we're gonna decide from those results on the final setup of the car to tune it to. What’s being discussed here is not a true side gapped spark plug but a gapping procedure or electrode modification that allows the spark to actually fire off of the very edge or ‘side’ of the spark plug’s ground electrode. -Baseline my new setup on dyno day 2.-Stock timing w/stock plug gap and non-indexed.-Advanced timing w/stock plug gap and non-indexed.-Advanced timing w/side gapped & indexed plugs. Please like and subscribe!! While spark plug gap does not have a direct effect on timing, excessive gap in a power adder application can easily cause engine misfire. I've done some more web searches and it looks like it's the other way. I really want to leave the shop with some definitive data to provide here. The spark is physically shorter, but longer duration.The larger the gap, the more voltage it takes to bridge that gap, and the shorter the time the coil is capable of producing voltage sufficent to jump that gap. Since the gap size has a direct effect on the voltage necessary to jump the gap and ionize (light) the air-fuel mixture, careful attention is required. Excessive spark plug gap results when the voltage has too far to travel. While most engines like the spark plug's gap open to the intake valve, there are still other combinations that make more power with the gap pointed toward the exhaust valve. ... so yea just for those who care and might be having spark blow out issues a good side gapping seems to help a bit. I have a chopped 53 Harley with a barely streetable, poked and stroked 92CI and a set of shovel heads on top, and can tell you for a fact that side gapping the plugs results in much easier starting and they seem to last 3 times as long. BMW Motorcycle Dyno Testing Results In Independent Test Conducted by German BMW Motorrad Magazine The BRISK Premium Spark Plugs Outperformed All Leading Competitors!One of the most prestigious journals - BMW M Side gapping spark plugs has been use in racing for years to increase horsepower by unshrouding the spark thus allowing the flame created to propagate faster resulting in a more complete burning of the fuel/air mix. Side gapping reduces spark blowout. While plugs are pre-gapped from the factory, the gap may need to be adjusted for the vehicle that the spark plug is intended for. ... a plug and grounding it so you could see the spark. Many manufacturers offer plugs deemed racing plugs that are side gapped but at … The increased length of the spark travel weakens it, robbing it of the hot, strong ignition charge it needs to fire the plug. Included on that list of old racers tuning tricks is spark plug side gapping. 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