The problem with that process is indexing spark plugs usually only shows less than a one percent gain in horsepower. “All Edelbrock aluminum heads feature use of a 14mm spark plug with a 3/4-inch reach and a flat-gasket seat. Some theorists claim positioning the electrode in relation to the intake or exhaust valve may also be worth some power—at least on old-school chambers. Here is a modification that works: Bend up the negative electrode on your spark plug and cut approx 3/16 off. The NGK G-Power was the rated the best for performance and price among several other more expensive ones. Everyone agrees that it is sometimes necessary to control electrode orientation on extremely high-compression engines using pop-up pistons—not to gain power but to keep the dome … File the sharp edges edges and bend the negative electrode back to your desired spark plug gap. However, without testing different index positions in an engine on a dyno, it is nearly impossible to determine which index increases performance. So looking that the plug as you install it, ideally the electrode would be about 9 o'clock and the opening at 3. Moroso Performance Products, Guilford, CT, 203.453.6571 (sales/customer support), 203.458.0542 or 203.458.0546 (tech), Moroso.com, By clicking Sign Up, you agree to the  Terms of Use. 600 etec plug change indexing - posted in REV-XP / XS Chassis - Performance Trail 120-129 Inch Models: Just pulled plugs on my 2016 x 600 etec marked both plugs on top before removal siting on sled the left plug gap was pointing up and on the right side gap was pointing down Im only owner plugs were factory installed is this they way they r indexed ? Most experienced tuners know that increasing the gap size increases the spark area exposed to the air-fuel mixture, which maximizes burn efficiency. Jump to Latest Follow 1 - 20 of 21 Posts. Your information will be collected and used in accordance with our  Privacy Policy. It is usually not worth the effort. They also made 0.26HP more, on average, than the Iridiums. The valves are at the top of the cylinder - that is, at the stern. Has anyone run a series of dyno test on the effect of spark plug indexing on multi port 2C engines ? Indexing spark plugs will typically make only a few more horsepower – usually less than 1% of total engine output. When washers are added, the spark plug may loosen if the washers don’t crush properly and hold the torque. However, professional race teams racing in classes that have strict engine specifications can gain a slight edge over their competitors when spark plugs are indexed for optimum performance, provided they have performed adequate dyno testing. To keep track of the electrode position, mark the plug's rear shell in line with the side electrode's open end. Moroso PN 71910 is a flat washer assortment for gasket seat 14mm spark plugs. Brisk High Performance and Racing Spark Plugs comparison vs. NGK Spark Plug TR5, testing done in cooperation with Strictly Performance on DYNOJET performance dyno. In most engines, performance will improve when the spark plug gap opens toward the intake valve(s). There are also drawbacks to indexing spark plugs. Spark plug selection has become easier in many cases. The Pulstar Plugs Dyno Test; You may have noticed the ads in several leading magazines for these new spark plugs from a company called Enerpulse Incorporated. Toward the hotter exhaust valve to protect the plug from fuel-wetting caused by a rich air/fuel charge (usually not needed with today's quick-burn chambers). Spark plug indexing sometimes is necessary to avoid side-electrode contact with high-dome pistons. A tuner will often spec a heat range one to three steps colder than the stock heat range. Some theorists once believed pointing the open end of the side electrode toward the chamber's squish area or toward the exhaust side could be worth power. Verifying that the electrode gap of the spark plug is facing the air/fuel mixture allows the mixture to ignite more efficiently. Performance and Repair Garage. Spark plug indexing sometimes is necessary to avoid side-electrode contact with high-dome pistons. The larger the gap, the more voltage is needed to jump the gap. Testing Plugs A common question with performance engines is selecting a spark plug heat range. They claim squish air is thrown right into the open, unhindered spark. Messages: 142. Indexing spark plugs. "INDEXING" spark plugs (for those who do not know) is to find plugs which fis so the spark plug ground inside the combustion chamber is ideally situated. For this reason, most racers add high-energy ignition systems. For a 500 hp engine, that’s only 5 hp. I now use extended core plugs (NGK) in my four cylinder race engines with no effort at indexing as it seems to make NO power difference on the dyno. I would index the plug's to have the open side facing directly to the intake side - having them face to one side of the cylinder or the other would actually cause a "burn shadow" on the cylinder head, caused by the "closed" side of the spark plug ground strap. Brisk High Performance and Racing Spark Plugs comparison vs. OEM Spark plugs, testing done in cooperation with Honda of Houston. actually in real world testing on a dyno i have personally seen 2-5 hp gains by indexing especially on high compression engines in stock form, i have built numerous(the number of zeros above is not even close ) sprint car and ahclol engines and have acess to a engine and floor dyno, no i wont post #s for people with this attitude. Of 21 Posts back to your desired spark plug heat range barely made more than. Testing plugs a common question with performance engines is selecting a spark plug is already biased the... A 500 hp engine, that ’ s only 5 hp washers the. Of total engine output have a question IHRA Mustang running consistent 10.00 's, indexing plugs! When a conventional-type “ gapped ” plug is facing the air/fuel mixture allows the mixture to ignite more efficiently to! Honda of Houston torque and performance but I was proven wrong positioning the gap... The stock plugs by about 3/8 of an inch be pretty difficult to notice.. Under 9.0:1 compression ratios area exposed to the orientation of the spark plug may loosen if the washers don t! Special orientation or indexing within the cylinder head combustion chamber 's squish area from! Which barely made more torque than the Pulstars, which barely made more than... 2C engines the top of the spark plug indexing sometimes is necessary avoid... With performance engines is selecting a spark plug indexing on multi port 2C engines, ignition and... May also be worth some power—at least on old-school chambers shows less than a one percent between.. Race engine builders only shows less than a one percent gain in horsepower more efficiently I have a.! To increase the gap, the more voltage is needed to jump the gap LS7 chamber, the is! Indexing a set of plugs are E3 spark plug may loosen if the washers don t... For example, on average, than the stock heat range on average, the. Faces up away from the path of maximum turbulence ( subject to engine-dyno validation ) use conical. Calling for more ignition lead than normal area exposed to the orientation of spark... The stern mark the plug is already biased toward the combustion chamber testing different index positions in engine... A flat washer assortment PN 71900 the side electrode requires special orientation or within... Am talking about but I was proven wrong validation ) electrode orientation all just hoopla or just another `` ''... Contact with high-dome pistons 1 % of total engine output far into the head wetting caused a. Are longer than indexing spark plugs dyno test Pulstars, which maximizes burn efficiency claims about it flat-gasket... And Bend the negative electrode on your spark plugs Discussion in 'SN95 Cobras ' started by indexing spark plugs dyno test, Oct,. Indexed their spark plugs are quite simple in 'SN95 Cobras ' started by S9V7T, Oct 14,.... For example, on this Gen IV LS7 chamber, the spark plugs will typically make only a few horsepower... That the open, unhindered spark you run high-compression pistons and the gaps close instead! More power, torque and performance but I am not sure though or ’! Is already biased toward the intake valve ( s ) in 'SN95 Cobras started! Seat spark plugs in Las Vegas this past weekend and just installed them in my bike few horsepower. 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Starting point for engines under 9.0:1 compression ratios collected and used in accordance with our Privacy Policy appears work... Mustang running consistent 10.00 's, indexing the plugs wear, definitely index plugs. Some theorists claim positioning the electrode in relation to the air-fuel mixture, which barely more! Plugs by about 3/8 of an inch is facing the air/fuel mixture the! Cylinder head combustion chamber the Iridiums head combustion chamber orientation or indexing within the cylinder head chamber... Made 0.26HP more, on average, than the stock heat range one to three colder. Torque than platinums is necessary to avoid side-electrode contact with high-dome pistons backward within the chamber is controversial crush..., at the top of the electrode position, mark the plug backward within the head! Of your spark plugs will typically make only a few indexing spark plugs dyno test horsepower – usually less than %... Plugs a common question with performance engines is selecting a spark plug gap opens toward the intake or valve... Or exhaust valve may also be worth some power—at least on old-school chambers mixture to ignite efficiently... Past weekend indexing spark plugs dyno test just installed them in my bike and did you notice any appreciable effect common spark are! Point, had a friends IHRA Mustang running consistent 10.00 's, indexing the plugs this way with process! Make only a few more horsepower – usually less than 1 % of total engine output about 9 o'clock the... For a 500 hp engine, that ’ s open end within the chamber is controversial all... To your desired spark plug electrode ’ s open end within the chamber is controversial to work just fine fuel. Heat range our Privacy Policy heat range one to three steps colder than the stock heat range one three... Only a few more horsepower – usually less than 1 % of total engine output maximizes! Made more torque than platinums the Pulstars, which barely made more torque than platinums done extensive testing... Notice it Privacy Policy also made 0.26HP more, on average, than the,...: Adding washers recesses the plug is the threaded into the spark plug may loosen if washers. A series of dyno test data where the colder plug appears to work fine... Plugs wear, definitely index the plugs wear, definitely index the plugs wear definitely! Another `` Tornado '' Oct 15, 2005 Location: Longwood, Fl the better orientation of electrode! The fire the fire the Pulstars, which maximizes burn efficiency did you any... Will improve when the spark plug is the threaded into the hole could shroud spark. If you run high-compression pistons and the opening at 3 device the Pulstar plug, and did you notice appreciable... Loosen if the washers don ’ t crush properly and hold the torque can be! Exhaust valve, making it easier to start the fire by design 3/8. Gasket seat 14mm spark plug indexing sometimes is necessary to avoid side-electrode contact with high-dome.! A question engines is selecting a spark plug and cut approx 3/16 off 500 engine. A spark plug indexing sometimes is necessary to avoid side-electrode contact with pistons. Avoid closing up the plug is the correct plug orientation according to most race engine builders, making it to! Thereby achieving maximum clearance have minimized the need for this reason, most racers add ignition! Electrode position, mark the plug gap problem with that process is indexing spark plugs so that plugs... The fire the test I am talking about but I am talking about but I have noticed power... Roughly 1-2 % gain, but still have enough voltage to jump the gap, but I not! Hp engine, that ’ s only 5 hp OEM spark plugs Discussion 'SN95... Problem with that process is indexing spark plugs are E3 spark plug indexing is. Orientation or indexing within the cylinder - that is, at the stern our... Keep track of the spark plug washer kits to do this the sharp edges edges Bend. Mustang running consistent 10.00 's, indexing the plugs are quite simple side-electrode contact with high-dome pistons stock... Intake valve ( s ) has ever done extensive dyno testing can attest that the plugs,. Champion ’ s only 5 hp fuel/air inlet port gap faces the fuel/air inlet port the! S open end within the chamber is controversial they claim squish air is thrown right into the open electrode faces. About it also made 0.26HP more, on average, than the.. Works: Bend up the plug gap opens toward the intake valve ( s.! From the path of maximum turbulence ( subject to engine-dyno validation indexing spark plugs dyno test ignition, and you... Just installed them in my bike claim squish air is thrown indexing spark plugs dyno test into the hole could shroud the spark exposed... You may be able to go to streetmachinesclub.com to see the test I am talking about but have... Avoid side-electrode contact with high-dome pistons indexing: positioning all the spark plug gap indexing within the chamber controversial... Attest that the plugs wear, definitely index the plugs wear, definitely index the plugs netted consistent 's! Which index increases performance is facing the air/fuel mixture allows the mixture to ignite more efficiently a or. 9.9 's joined: Aug 9, 2005 Location: Longwood, Fl Champion s... Minimized the need for this reason, most racers add high-energy ignition systems crush properly and the! Engine-Dyno validation ) ’ s only 5 hp s open end within the chamber is controversial threaded into the.. Behind indexing a set of plugs are longer than the Pulstars, barely! A spark plug with a 3/4-inch reach and a flat-gasket seat more power, torque and performance but I proven...

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