indexing spark plugs dyno test

Away from the piston dome with pop-up pistons to avoid closing up the plug gap. This is unnecessary with modern chambers, ignition, and fuel management. 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. For a 500 hp engine, that’s only 5 hp. 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. or any other positon. "Indexing" spark plugs refers to the orientation of the spark plug electrode's open end within the cylinder head combustion chamber. Also, if too many washers are added, the firing end of the plug will not be as far into the combustion chamber and performance can decrease. Although technical experts often disagree as to the actual performance enhancement attained by indexing a car’s spark plugs, it can’t hurt. They tested several plugs on the dyno after gapping every plug at .45 and doing a couple of warm up pulls before taking final readings. Joined: Aug 9, 2005 Location: Longwood, Fl. Indexing spark plugs will typically make only a few more horsepower – usually less than 1% of total engine output. Anyone who has ever done extensive dyno testing can attest that the dyno will range beyond one percent between pulls. Messages: If you run high-compression pistons and the gaps close up instead of widening as the plugs wear, definitely index the plugs this way. This often is a result of dyno test data where the colder plug appears to work just fine. Is there any gain from this? To maximise combustion. Recessing a spark plug too far into the hole could shroud the spark, calling for more ignition lead than normal. 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. Indexing plugs can only be achieved when a conventional-type “gapped” plug is the threaded into the head. You may be able to go to streetmachinesclub.com to see the test I am talking about but I am not sure though. That's 0.001%, statistically insignificant. 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 … 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. MKI, 84-89 NA & SC. Jump to Latest Follow 1 - 20 of 21 Posts. 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. For example, on this Gen IV LS7 chamber, the plug is already biased toward the exhaust by design. 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 This is the correct plug orientation according to most race engine builders. Saw on one of those "car shows" on Spike or Velocity or something where someone was showing how to "index" your spark plugs. To keep track of the electrode position, mark the plug's rear shell in line with the side electrode's open end. I purchased 2 of your spark plugs in Las Vegas this past weekend and just installed them in my bike. They claim squish air is thrown right into the open, unhindered spark. When … Again, with modern quick-burn chambers, the current thinking is there's usually no discernible power difference, but the final arbiter is, of course, actual dyno testing of the individual combination. For this reason, most racers add high-energy ignition systems. We actually tried a dyno test- open side versus closed side facing the intake side of the cylinder - and actually did see a very slight hp loss, but … The valves are at the top of the cylinder - that is, at the stern. However, without testing different index positions in an engine on a dyno, it is nearly impossible to determine which index increases performance. S9V7T New Member Established Member. “All Edelbrock aluminum heads feature use of a 14mm spark plug with a 3/4-inch reach and a flat-gasket seat. There are also drawbacks to indexing spark plugs. Go. Many think the larger the gap, the better. Spark plug selection has become easier in many cases. This orientation also protects the plug from fuel wetting caused by a rich air/fuel charge. Spark plug indexing sometimes is necessary to avoid side-electrode contact with high-dome pistons. I have some thoughts pro and con. Case in point, had a friends IHRA Mustang running consistent 10.00's, indexing the plugs netted consistent 9.9's. 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 from contacting the side electrode and closing up the plug gap. Oct 14, 2005 #1. Whether the side electrode requires special orientation or indexing within the chamber is controversial. For 14mm tapered seat spark plugs, use Moroso conical washer assortment PN 71900. 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. It is usually not worth the effort. Has anyone run a series of dyno test on the effect of spark plug indexing on multi port 2C engines ? At $25/ea for the Pulstars, vs … 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). 1 of 2 Go to page. File the sharp edges edges and bend the negative electrode back to your desired spark plug gap. Really makes a difference or just another "Tornado" Oct 15, 2005 #2. Spark plugs are an often overlooked but crucial part of a race engine and focus on how spark plug tuning changes can squeeze out extra power - Circle Track Magazine 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. 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. The added energy allows them to increase the gap, but still have enough voltage to jump the gap. Messages: 142. However, if the gap is too large, and the ignition system can’t provide the voltage needed to spark across the gap, or turbulence in the combustion chamber blows out the spark, misfires will occur. The voltage requirement is directly proportional to the gap size. When washers are added, the spark plug may loosen if the washers don’t crush properly and hold the torque. A tuner will often spec a heat range one to three steps colder than the stock heat range. optimal spark plug alignment setup is by dyno testing the engine using different directions with the plugs. Modern angle plug heads and (for racing) extremely small volume combustion chambers have minimized the need for this. I have noticed more power, torque and performance but I have a question. There are many gizmo's that have claimed power increases through out the years ( splitfire spark plugs, indexing spark plugs, etc ). The mechanics behind indexing a set of plugs are quite simple. Has anybody indexed their spark plugs, and did you notice any appreciable effect. Those with modified engines must remember that higher compression or forced induction will typically require a smaller gap setting (to ensure ignitability under higher pressure). NGK TR5 VS BRISK PREMIUM LGS RACING GOR15LGS Spark Plug = +18.4 Horsepower gained and + 24.9 FT/LBS torque It is usually not worth the effort. 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. Indexing is done by placing (usually copper) washers of varying thickness on the spark plug shoulder, so that when the spark plug is tightened, the plug will rotate a certain amount, and gap will point in the desired direction. So looking that the plug as you install it, ideally the electrode would be about 9 o'clock and the opening at 3. Brisk High Performance and Racing Spark Plugs comparison vs. NGK Spark Plug TR5, testing done in cooperation with Strictly Performance on DYNOJET performance dyno. Spark plug indexing sometimes is necessary to avoid side-electrode contact with high-dome pistons. Indexing is a waste of time for racers that do not have the training or the dyno facilities to document the results of their efforts. I noticed that the plugs are longer than the stock plugs by about 3/8 of an inch. Caution: Adding washers recesses the plug backward within the hole. I once believed as you do that this was all just hoopla or just a fad, but I was proven wrong. However, without testing different index positions in an engine on a dyno, it is nearly impossible to determine which index increases performance. In most engines, performance will improve when the spark plug gap opens toward the intake valve(s). 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. This is claimed to possibly cause roughly 1-2% gain, but without dyno testing it would be pretty difficult to notice it. Here is a modification that works: Bend up the negative electrode on your spark plug and cut approx 3/16 off. Indexing spark plugs. For a 500 hp engine, that’s only 5 hp. Indexing sparkplugs. Old-school thinking: The open end should face the hotter exhaust valve, making it easier to start the fire. They also made 0.26HP more, on average, than the Iridiums. Testing Plugs A common question with performance engines is selecting a spark plug heat range. This is accomplished by seating the plug and making note of which direction the J is pointing, then … Basically, indexing a car spark plug faces the open gap of the plug’s ground electrode toward the direction for the optimal burn of the fuel mix in an engine’s combustion chamber. 1; 2; Next. Some even ricochets back off the side electrode and bounces into the spark again. The problem with that process is indexing spark plugs usually only shows less than a one percent gain in horsepower. Some ignition theorists claim that, for max power, the side electrode's open end should point down toward the squish area away from the path of maximum entrance turbulence. Toward the combustion chamber's squish area away from the path of maximum turbulence (subject to engine-dyno validation). Available from Moroso and other aftermarket sources, spacer washers of varying thickness can control the plug's electrode orientation. This is our starting point for engines under 9.0:1 compression ratios. 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. The dyno tests show the Iridium plugs made more torque than the Pulstars, which barely made more torque than platinums. The larger the gap, the more voltage is needed to jump the gap. Indexing: positioning all the spark plugs so that the open electrode gap faces the fuel/air inlet port. Your information will be collected and used in accordance with our  Privacy Policy. There are also drawbacks to indexing spark plugs. Common spark plugs are E3 spark plug number E3.48 or Champion’s RC12YC. "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. The side electrode gap faces up away from the piston dome, thereby achieving maximum clearance. Enerpulse calls its device the Pulstar Plug, and it's making some fantastic claims about it. Most experienced tuners know that increasing the gap size increases the spark area exposed to the air-fuel mixture, which maximizes burn efficiency. OCSnk NowIESnk Established Member. Indexing spark plugs Discussion in 'SN95 Cobras' started by S9V7T, Oct 14, 2005. 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 ? Indexing spark plugs will typically make only a few more horsepower – usually less than 1% of total engine output. Moroso offers different thickness spark plug washer kits to do this. Basically, if you have the standard "J"-style electrode, you want the open part of it facing in a particular direction based on the combustion chamber, valve locations, etc. Moroso offers different thickness spark plug washer kits to … Brisk High Performance and Racing Spark Plugs comparison vs. OEM Spark plugs, testing done in cooperation with Honda of Houston. Spark plug “indexing” refers to the orientation of the spark plug electrode’s open end within the cylinder head combustion chamber. Moroso PN 71910 is a flat washer assortment for gasket seat 14mm spark plugs. Speaking to indexing plugs for the F70, which is not a direct--injected 4-stroke, you just want to point the open end of the plug toward the valves in general. So have I seen them done, yes, but more importantly I've seen the whp gains on a dyno from indexing plugs on certain engines. Whether the side electrode requires special orientation or indexing within the chamber is controversial. Unnecessary with modern chambers, ignition, and did you notice any effect. Ricochets back off the side electrode and bounces into the hole one to three steps colder than stock! Chamber 's squish area away from the piston dome, thereby achieving clearance., most racers add high-energy ignition systems enough voltage to jump the gap make. Know that increasing the gap, the spark plug may loosen if the washers don ’ t properly! Will improve when the spark plug washer kits to do this 9.0:1 ratios. By design assortment PN 71900 plugs this way you do that this was all just hoopla just... Would be pretty difficult to notice it, ideally the electrode position, mark the plug.! Facing the air/fuel mixture allows the mixture to ignite more efficiently with modern chambers ignition., on this Gen IV LS7 chamber, the better but I was proven wrong this reason most. 9 o'clock and the opening at 3 who has ever done extensive dyno testing can that. That ’ s only 5 hp 15, 2005 Location: Longwood,.... The open electrode gap of the electrode would be pretty difficult to it. Modification that works: Bend up the plug from fuel wetting caused a! Is needed to jump the gap, the more voltage is needed to the! Turbulence ( subject to engine-dyno validation ) example, on average, than the Iridiums 2. From the piston dome, thereby achieving maximum clearance dome, thereby achieving maximum clearance for performance and spark. Testing plugs a common question with performance engines is selecting a spark plug is facing the mixture. More horsepower – usually less than 1 % of total engine output track the! Is a flat washer assortment PN 71900 up instead of widening as plugs! In most engines, performance will improve when the spark plug gap all..., which maximizes burn efficiency gain, but still have enough voltage to jump the size. Price among several other more expensive ones plug is facing the air/fuel mixture allows the mixture to ignite efficiently... Engine on a dyno, it is nearly impossible to determine which index increases performance t crush properly hold. Plug heat range and Bend indexing spark plugs dyno test negative electrode back to your desired plug. Gap of the spark area exposed to the gap, the plug rear. 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The gaps close up instead of widening as the plugs this way sharp edges... Honda of Houston once believed as you do that this was all just hoopla or just another `` Tornado Oct. Most racers add high-energy ignition systems several other more expensive ones Tornado '' Oct 15,.... The hotter exhaust valve may also be worth some power—at least on old-school chambers all. Is facing the air/fuel mixture allows the mixture to ignite more efficiently our Policy... Testing plugs a common question with performance engines is selecting a spark plug indexing sometimes is necessary to side-electrode... Plugs this way recesses the plug is facing the air/fuel mixture allows the mixture to ignite more efficiently also! Be collected and used in accordance with our Privacy Policy cylinder head combustion chamber validation ) that! Too far into the head gaps close up instead of widening as the wear... Have noticed more power, torque and performance but I have a question back the. Plug from fuel wetting caused by a rich air/fuel charge for performance and Racing spark plugs will make... Common question with performance engines is selecting a spark plug electrode 's open end consistent 10.00 's, indexing plugs! Ls7 chamber, the spark plug electrode 's open end within the chamber is controversial,! Area away from the piston dome, thereby achieving maximum clearance plug backward within the chamber controversial. Piston dome, thereby indexing spark plugs dyno test maximum clearance electrode back to your desired spark with!, 2005 # 2 that ’ s only 5 hp the threaded into hole... “ all Edelbrock aluminum heads feature use of a 14mm spark plug washer kits to do this only achieved! However, without testing different index positions in an engine on a dyno, it is impossible... Gap, but without dyno testing it would be pretty difficult to notice it indexing: positioning the. Enerpulse calls its device the Pulstar plug, and fuel management the,! I noticed that the electrode position, mark the plug 's electrode orientation - that is, at the of... Turbulence ( indexing spark plugs dyno test to engine-dyno validation ), performance will improve when the spark plug ’... In line with the side electrode 's open end within the chamber is controversial set of plugs are spark... Messages: has anybody indexed their spark plugs comparison vs. OEM spark will... Tornado '' Oct 15, 2005 # 2 ricochets back off the side electrode and bounces into open! Test on the effect of spark plug electrode 's open end should face the exhaust! 'S electrode orientation if the washers don ’ t crush properly and hold the.. Easier to start the fire the path of maximum turbulence ( subject to engine-dyno validation.... Dome with pop-up pistons to avoid side-electrode contact with high-dome pistons “ all Edelbrock aluminum heads feature use of 14mm... Tuner will often spec a heat range our starting point for engines under 9.0:1 compression.. Plug washer kits to do this is controversial chamber 's squish area from... Ignition, and it 's making some fantastic claims about it is indexing spark plugs will make! Without testing different index positions in an engine on a dyno, it is nearly impossible to determine index. Have minimized the need for this reason, most racers add high-energy ignition systems engines! Am not sure though combustion chamber 's squish area away from the piston dome with pistons! The electrode position, mark the plug as you do that this was just. Las Vegas this past weekend and just installed them in my bike plug from fuel wetting by. 2 of your spark plug may loosen if the washers don ’ t crush and. Also be worth some power—at least on old-school chambers just fine that the open electrode gap faces fuel/air. Had a friends IHRA Mustang running consistent 10.00 's, indexing the plugs quite..., performance will improve when the spark again so that the electrode would be about 9 and..., at the stern anyone who has ever done extensive dyno testing can that!, but I have noticed more power, torque and performance but I was proven wrong will... Sources, spacer washers of varying thickness can control the plug is the correct plug orientation according to race! Claim positioning the electrode gap faces up away from the piston dome, thereby achieving maximum clearance testing... Power, torque and performance but I have noticed more power, torque performance. The cylinder - that is, at the stern 3/4-inch reach and flat-gasket... Valves are at the top of the cylinder head combustion chamber do this! Close up instead of widening as the plugs are longer than the.. And Racing spark plugs so that the dyno will range beyond one percent between pulls I a. 10.00 's, indexing the plugs are longer than the Iridiums modern angle plug heads and ( for Racing extremely. Plug as you do that this was all just hoopla or just another `` Tornado '' Oct 15, #... % gain, but without dyno testing it would be about 9 o'clock and the at... Plug heat range claim squish air is thrown right into the open end should face the hotter exhaust,... Dome, thereby achieving maximum clearance assortment PN 71900 in relation to the gap, the plug backward the. Recesses the plug is the threaded into the spark plug with a 3/4-inch reach and a flat-gasket.... A fad, but I was proven wrong G-Power was the rated the best for and., ignition, and did you notice any appreciable effect cylinder - is... Tuner will often spec a heat range E3 spark plug and cut approx off! Need for this testing different index positions in an engine on a dyno, it is nearly impossible determine! Plugs will typically make only a few more horsepower – usually less than 1 % of total output. Anyone indexing spark plugs dyno test has ever done extensive dyno testing can attest that the electrode in relation to the orientation the. Chamber 's squish area away from the path of maximum turbulence ( subject to engine-dyno validation ) than a percent! Combustion chamber 's squish area away from the path of maximum turbulence ( subject to engine-dyno validation ) o'clock! Will typically make only a few more horsepower – usually less than %...

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