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last update:
May 05, 2016



LIGHT SPEED ENGINEERING, LLC  RECOMMENDED SPARKPLUGS


Gap spark plugs fired by Light Speed Engineering's PLASMA CDI systems to .032"-.045" for standard compression engines (7 - 8.5:1) and .026"-.034" for high compression engines (8.7 - 10:1).  Turbo and Supercharged engines should run a spark plug gap of .026" - .034".  Install the spark plugs and inserts using 15 and 25 lb/ft respectively, using anti-seize.

 

New, High Performance Plugs
 

High Performance plugs 1/2" reach

HP Spark Plugs
These plugs have small iridium & platinum electrodes for best performance and long life. 
   
HP spark plugs are available in 24, 27, and 31 heat ranges and are $39 each.

They fit Light Speed Engineering's standard adaptors that have a 1/2" external thread, (18mm x 1/2").

 

 

 

 

HP-LR spark plug and adaptorHP-LR Spark Plugs and Adaptors
These are the same 14mm thread, small iridium & platinum electrode spark plugs as the HP plugs described above but they are specifically for cylinders with "long reach" threads.  

A high performance option for Continental IO-550, IO-470, IO-520 and Lycoming IO-580.

HP-LR spark plugs are available in 24, 27, and 31 heat ranges and are $39 each.

They require the new HP-LR adaptors that have an 18mm x 13/16" external thread and a 14mm internal thread.  HP-LR adaptors, PN: 7.252, are $24 each. 

 

 

 

 

Optional High Performance Plugs
Performance Plugs, now Standard Issue

 (Right) IK24 -34: Iridium racing sparkplugs.  The smallest center electrode available for best spark exposure and hottest spark. (Same electrode size as the new HP plugs.) $15-21 each.

 

 


Performance Long Reach Plugs

IKH-LR 24 & 27: Iridium spark plugs. These are the same 14mm thread, small iridium electrode spark plugs as the IK plugs described above but they are specifically for cylinders with "long reach" threads.  
Available in 24 and 27 heat ranges. $15 each.

These plugs require the new HP-LR adaptors that have an 18mm x 13/16" external thread and a 14mm internal thread.  HP-LR adaptors, PN: 7.252, are $24 each.

 

 

Alternate Ni Electrode Plugs

EMR-C spark plugs, standard issue Single ground electrode with a short body make these a durable option for most applications.  The W27EMR-C is no longer available and has been replaced by the premium IK27 plug or the HP27 plug.  

The W24EMR-C plug (hotter than the W27) used on lower to standard compression engines is still available.

W24EMR-C: Used on lower to standard compression engines.  $8.90 each.

The standard reach (1/2") spark plug adaptor is also pictured here.  This adaptor is used when converting aircraft engines using 1/2" reach aircraft spark plugs to 14mm plugs.  Light Speed Engineering's spark plug adaptors are made of high strength aluminum bronze.

*These plugs and adaptors are included with ignition kit purchase for those with 1/2" reach.
Additional or replacement parts are priced as follows.
 $15.00 per adaptor with copper washer ($60 per 4-cyl set)
 $8.90 per sparkplug


 

Long Reach Spark Plug and AdaptorLong Reach Plugs 

X27GPR-U:  
Single ground electrode sparkplug for aircraft cylinders using 3/4" reach spark plugs.  Standard issue for Continental IO-550, IO-470, IO-520 and Lycoming IO-580.

Long reach adaptor and copper washer also shown.

*Plugs and adaptors included with ignition kit purchase for those with 3/4" reach plugs.  

Additional or replacement parts are priced as follows.
 $24.00 per long reach adaptor with washer
 $8.90 per sparkplug

 

 

 

 

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