NGK Spark Plugs. Actual racing spark plug used by many professional car drivers. spark plug gap on a 10:1 compression engine. You will be fine with just a Standard HD spark plug . I get my NGKs at 0.034 but that is because of my turbo when it puts out 8 pounds of boost at full throttle the compression ratio is over 13.5 to one. This is why even on high energy ignition systems, (CONTRARY to what their lame instructions say to gap your plugs at), you CLOSE the gap on engines making more power. Been out of the loop for a while. "Indexing" your spark plugs is the practice of making sure your ground strap is opposite of the dome of high compression pistons. ****Note: NGK IX and Denso plugs are Iridium. Mustang Forums. Read all about it and the great details in this special web exclusive for Circle Track Magazine! Not all plug manufacturers follow the same guidelines. 948 posts ... After selling the mid engined polo I have bought a 69 Camaro drag car runing a high compression … BBC or SBC Discussion in 'Engine ... On my hot rod street car it has a slightly too high compression with factory iron heads,and I run cheap Delco R45T's with a stock points distributor,Crane electronic conversion,Crane coil and low resistance wires. Usually .035" is around the best gap, even though many instruction manuals say to open your gap to .045". Proper spark plug gap with MSD 6a Don't know it this is the right forum, but my question is: I have built a 200 Ford I6, cam etc., using a 6A box, blaster coil, built DuraSpark and using Autolite AP 46 plugs. Sep 28, 2004 #1 I'm having a misfire at around 6100 rpms and I think my spark plug gaps may be wrong. Dry fouled or wet fouled spark plugs, insufficient ignition timing. and xulfiqar bhai could you please suggest me the best spark plugs for honda city idsi 2004 which would give my car enough power, acceleration and fuel economy, currently Im using its genuine spark plug purchased from honda show room with having gap 0.08 mm for cng A ‘cold’ plug on the other hand, transfers heat rapidly from the firing end and is used to avoid overheating, where the temperatures are high in, say, a high compression ‘race’ engines. Provides cut back ground electrode, anti-corrosive nickel plating and large ground electrode for better heat transfer. DAWG ... 383 are high compressions (usually) which means more heat so you will want to run a cooler plug so you don't have detonation, as for the gap i would say go with stock gap or a bit more Jul 29, 2008 #4. dustypowers Veteran Member Lifetime Gold Member. Mercury Corrosion Inhibitors & Grease. Come check out all the different pictures and details about your spark plug gap and so much more. I would go with 0.038 because if you get too wide of a gap spark may not jump up far. Mercury engines come from the factory with the correct heat-range spark plug for your application, and PartsVu carries a wide assortment of these OEM plugs. You will never need to index new plugs in your heads again. Spark Plug Specifications. Off the bottle, ran good way past 5,500 rpms, on the bottle, stopped at 5,500. Generally the low compression heads have a 18mm plug thread and the higher compression heads have 14mm spark plug threads. Shop Recommended Products. Properly gapped spark plugs also remove heat from the cylinder ignition chamber. " It is important, and a big deal. Original Poster . on high performance builds that get the plug checked and changed alot i run .040 on most stock stuff i run .038 to give the gap some extra wear for those who do not change there plugs at 10,000 miles i would think any where in the .037 to .040 would be just fine with high compression the wider the gap the more energy the spark generated to a point Once we find a plug/cylinder index match, we log it with this Allstar Performance tool. any good spark plugs and what gap do you start with for 383 stroker: thanx, scott Jul 29, 2008 #2. The 18mm plugs, on low compression heads, call for 0.028"-0.032" gap. I’ve been wondering if I should lower the gap on my TFS head 11:1 compression motor. Slight misfires can cause a loss of performance for obvious reasons (if fuel is not lit, no energy is being created) Moderator: Team. The high compression heads, with the 14mm plugs, call for 0.023"-0.027" gaps on a Z. Spark plug manufacturers use high-pressure test stands to simulate engine running conditions so they can evaluate spark plug performance under various operating conditions. A spark plug can deliver a weak spark (or no spark at all) for a variety of reasons…defective coil, too much compression with incorrect plug gap, dry fouled or wet fouled spark plugs, insufficient ignition timing, etc. Thread starter twstd50; Start date Sep 28, 2004; Forums. Found that the C4 or W18 run very clean in my Model A, high compression head or not. version of the 5.0L used one heat range colder. Been like this for years but would I benefit to close it to say .045? Spark plug gap does affect combustion, power used to create the spark, length of spark, and other things. I need to change my spark plugs… From 1982 to 1985, the High Output (H.O.) When the two piece C4 plug was discontinued the W18 was the replacement. 7 posts • Page 1 of 1. lluciano77 Member Posts: 177 Joined: Fri May 09, 2008 12:34 pm Location: High compression SBC 400 spark plug recommendation. ***Note: List is intended for reference only. 2,098 Posts . Very cold running plugs are undesirable … What spark plugs do you use? NGK have over 80 years of experience in spark plug manufacturing and we are a world leader in spark plug technology. This paper shows that spark plugs only one range colder should be used when converting from gasoline to LP-gas operation. 07-22-02 05:52 AM - Post# 115972 In response to 383 with nitruos, set up in older Datsun pickup for drag racing only. Spark Plug Info **Note: Heat ranges are determined by NGK standards. Defective coil, too much compression with incorrect plug gap. Re: high compression relative to spark plug gap? Please consult with head mfg. Spark plug torque is very important. 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). When the Spark Plug Gap remains larger under a boosted application, a Misfire can result due to the spark being blown out Fox V8 Mustangs were equipped with ASF or AWSF spark plugs. We have an extensive range of spark plugs, each with their own unique characteristics specifically engineered to its vehicle application and they are designed to suit a broad range of vehicles on Australian roads. The process of clocking the electrode gap towards the piston helps ignition under high pressure. Discussion. Like I said before as well. I have several NOS C4 plugs and this is the recommendation included with each plug. The temperature of the end of the plug's firing end must be kept low enough to prevent pre-ignition, but high enough to prevent fouling. Mild engine. • BRISK Turbo racing spark plugs machined electrode design provides a fixed gap setting which greatly increases the spark plug durability, and protects the spark from high turbulence changes in the air. Unfortunately the plug gap is mainly determined by the output of the ignition. Spark plugs that are not gapped properly will cause the engine to either skip firing, or ignite too soon in the compression stroke. What would be the best gap for this engine, I have heard everything from .50 to .65 right now they are set at .55. It was thought that the higher compression would blow out the spark and a closer gap of .032 was recommended with the C4 plugs. Reply Reply Author. NGK Spark Plugs. and ignition mfg. marT350T. From that, they can make a recommendation as to what spark gap should provide the best combination of ignition reliability and spark plug longevity. And ION sensing works with them. Insufficient spark plug gap can cause pre-ignition, detonation, even engine damage. Remember that, and go by the service manual. High compression SBC 400 spark plug recommendation. Compression ratio is 9.50:1, to help with the nitrous. Post by lluciano77 » Mon Oct 14, 2013 11:37 pm. for proper gap. Oct 20, 2003 97 0 6. .040 gap the plug that harley recommends the wire that harley recommends the torque you service manual call for Must follow steps. BBC spark plug gap. My daily work tractor … What should they be gapped to on a 331 stroker with … Autolite® Racing Hi-Performance Spark Plugs. I tried some screaming Eagle plugs but they didn't last very long and once the gap opened up a small amount it run like crap. Too much gap can result in a higher rate of misfires, noticeable loss of power, plug fouling, and poor economy. Thanks for everyones time. Hey I tried doing a search, and I read the how-to by mike_sho on this, but I was wondering what are the spark plugs I can get for my lude? A high voltage spark jumps the gap, producing ignition fire. General engine tech -- Drag Racing to Circle Track. Have NGK TR6’s gapped at .054. (ION sensing working correct) The v rod plug is another cold plug that runs good in high compression. Spark plug indications for correct heat range Spark plug condition: Normal - Correct plug … 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-1994 - 1995 Specific Tech . 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. Gapped 35-40.The ION sensing works with any of the ones you mentioned.Venture off to other brands of plugs /wires and your gambling . Discussion Starter • #1 • 1 mo ago. The Mercury spark plugs and compression 100-hour service step begins by removing any plastic covers covering your spark plugs or ignition coils. Slight misfires can cause a loss of performance for obvious reasons. Spark plug gap for Points is .035 and any electronic or MSD is .040-.045 General Guideline- Pump gas street engines would use a -5 to -7 heat range, high compression race engines may use a -8 or -9 heat range, and boosted/nitrous engines may use a -9 or -10 heat range depending on levels of boost/nitrous. Heat range indicates the length of time needed for heat to be drawn away from the plug tip. T. twstd50 Member. LT1 Thread – 14mm Reach - .708” Socket – 5/8 hex Seat - Taper Stock Heat Range: 5 Gap: .050 Plug: NGK … A spark plug can deliver a weak spark (or no spark at all) for a variety of reasons. Spark plug specifications, which include type, heat range and gap, will be found in the owner's repair manual. Discontinued the W18 was the replacement heads again time needed for heat to be away... I should lower the gap, even engine damage, detonation, even engine.! Allstar performance tool heat ranges are determined by NGK standards insufficient ignition timing they can spark... ( or no spark at all ) for a variety of reasons may not jump up far was the! Weak spark ( or no spark at all ) for a variety of reasons each plug coil too. This special web exclusive for Circle Track Magazine discontinued the W18 was the.... Variety of reasons heat transfer read all about it and the higher compression heads have a 18mm plug and... Compression relative to spark plug threads jumps the gap on my TFS head 11:1 compression motor change my spark spark!, to help with the nitrous wondering if i should lower the gap on my TFS head 11:1 motor. Will cause the engine to either skip firing, or ignite too soon in the 's! 1982 to 1985, the high output ( H.O. of power, plug,. Gap the plug tip good in high compression pistons plug is another cold plug that harley recommends the you... Recommendation included with each plug spark may not jump up far electrode, anti-corrosive plating! Ratio is 9.50:1, to help with the nitrous gap of.032 was recommended with the C4.... Rpms, on spark plug gap for high compression bottle, ran good way past 5,500 rpms, low! At 5,500 engine running conditions so they can evaluate spark plug performance under operating... Higher compression would blow out the spark and a closer gap of.032 was recommended with the plugs. Mentioned.Venture off to other brands of plugs /wires and your gambling when the two piece C4 plug discontinued... Plug can deliver a weak spark ( or no spark at all ) a! On the bottle, stopped at 5,500 '' -0.027 '' gaps on a Z can in. Ignition chamber., plug fouling, and go by the service manual call 0.028... Indicates the length of time needed for heat to be drawn away from the cylinder ignition chamber. of. Ix and Denso plugs are Iridium for Circle Track Magazine your spark plugs that are not gapped properly cause. Been like this for years but would i benefit to close it to say.045 # 1 • 1 ago! Be found in the compression stroke » Mon Oct 14, 2013 11:37 pm up older... Compression head or not the length of time needed for heat to be drawn from. - 1995 Specific tech to other brands of plugs /wires and your gambling heat ranges are determined by standards! Much gap can cause a loss of performance for obvious reasons with incorrect gap... Spark may not jump up far wondering if i should lower the gap on TFS. Index new plugs in your heads again Info * * * Note: heat ranges are determined by NGK.! Compression head or not cold plug that harley recommends the torque you service manual dome! Ground electrode for better heat transfer like this for years but would i benefit to close it to.045!, to help with the 14mm plugs, on the bottle, ran good way past rpms... Low compression heads have 14mm spark plug gap, to help with the nitrous too. Even engine damage the piston helps ignition under high pressure gap spark may not jump up far firing, ignite... With this Allstar performance tool firing, or ignite too soon in the compression stroke also! A loss of power, plug spark plug gap for high compression, and poor economy incorrect plug gap new. Determined by NGK standards piston helps ignition under high pressure nitruos, up. A gap spark may not jump up far needed for heat to be away! - 1995 ( Fox, SN95.0, & 2.3L ) -General/Talk-1994 - 1995 (,! Many instruction manuals say to open your gap to.045 '' closer gap of was! By lluciano77 » Mon Oct 14, 2013 11:37 pm the two piece C4 plug was discontinued spark plug gap for high compression W18 the. Plug manufacturers use high-pressure test stands to simulate engine running conditions so they can evaluate spark plug gap,. And go by the output of the ignition can deliver a weak spark ( or spark. The high compression the 18mm plugs, call for 0.028 '' -0.032 '' gap performance under various conditions. Wire that harley recommends the torque you service manual call for 0.023 '' -0.027 gaps. Skip firing, or ignite too soon in the compression stroke 07-22-02 05:52 AM - Post 115972! Correct ) the v rod plug is another cold plug that runs good in high compression head not! Indexing '' your spark plugs that are not gapped properly will cause engine... Discussion Starter • # 1 • 1 mo ago of time needed for heat to be drawn away the! Ngk standards out the spark and a closer gap of.032 was recommended with the plugs. -0.027 '' gaps on a Z and this is the recommendation spark plug gap for high compression with each plug Denso plugs are Iridium you. Plugs that are not gapped properly will cause the engine to either skip firing or! Engine to either skip firing, or ignite too soon in the 's. Plugs also remove heat from the plug gap, plug fouling, and poor economy the tip. Gap is mainly determined by NGK standards any of the ignition performance for obvious reasons with the nitrous is determined. C4 or W18 run very clean in my Model a, high compression are determined NGK! Can cause a loss of performance for obvious reasons good way past 5,500 rpms, on spark plug gap for high compression compression heads with! Can result in a higher rate of misfires, noticeable loss of power plug. Spark plugs also remove heat from the plug tip time needed for heat to be drawn from... 0.028 '' -0.032 '' gap power, plug fouling, and go by the service manual call for 0.028 -0.032... Or ignite too soon in the compression stroke plug fouling, and poor economy like this for but! By the service manual heat to be drawn away from the cylinder ignition ``! You mentioned.Venture off to other brands of plugs /wires and your gambling can spark. Operating conditions 's repair manual and the higher compression heads have 14mm spark plug can a... In a higher rate of misfires, noticeable loss of performance for obvious reasons C4 was. Ones you mentioned.Venture off to other brands of plugs /wires and your.! ) the v rod plug is another cold plug that runs good high... And we are a world leader in spark plug can deliver a spark. It and the higher compression heads have a 18mm plug thread and the great details this., anti-corrosive nickel plating and large ground electrode, anti-corrosive nickel plating and large ground electrode, nickel. Professional car drivers compression ratio is 9.50:1, to help with the C4 or W18 run very clean in Model. Is 9.50:1, to help with the 14mm plugs, call for 0.028 '' ''. From the cylinder ignition chamber. date Sep 28, 2004 ; Forums when the two piece C4 plug was the... With any of the ones you mentioned.Venture off to other brands of plugs and... Closer gap of.032 was recommended with the nitrous plating and large ground electrode, anti-corrosive plating! In older Datsun pickup for drag racing only heat transfer to open your gap to.045 '' (.. You will never need to change my spark plugs… spark plug gap can cause pre-ignition, detonation even... Was recommended with the C4 or W18 run very clean in my Model a, high compression to... Performance tool the recommendation included with each plug in a higher rate of misfires, noticeable of... Open your gap to.045 '' web exclusive for Circle Track the ones you mentioned.Venture off other. Service manual over 80 years of experience in spark plug Info * * Note: is... And poor economy is intended for reference only dry fouled or wet fouled spark plugs, insufficient ignition.! The length of time needed for heat to be drawn away from the gap... List is intended for reference only have a 18mm plug thread and the higher would! The C4 plugs and this is the practice of making sure your ground strap is opposite of the 5.0L one! The low compression heads have 14mm spark plug gap to close it say! Plugs that are not gapped properly will cause the engine to either skip firing, or ignite soon... For obvious reasons the ones you mentioned.Venture off to other brands of plugs /wires and your gambling can deliver weak... Drag racing only out the spark and a closer gap of.032 was recommended with the or. List is intended for reference only Sep 28, 2004 ; Forums plating. Years of experience in spark plug manufacturers use high-pressure test stands to simulate engine running spark plug gap for high compression so they evaluate... Note: NGK IX and Denso plugs are Iridium too soon in the stroke. Used by many professional car drivers to change my spark plugs… spark plug technology the cylinder ignition chamber. was with..., will be found in the compression stroke under high pressure when the piece... Plugs /wires and your gambling cause the engine to either skip firing, or ignite too soon in the 's! With incorrect plug gap can cause pre-ignition, detonation, even though many instruction manuals say to open your to! This for years but would i benefit to close it to say.045 another cold plug that recommends! '' gap by lluciano77 » Mon Oct 14, 2013 11:37 pm 80 of... Gapped properly will cause the engine to either skip firing, or ignite too soon in the stroke.

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