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
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
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.
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
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is no longer available and has been replaced by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 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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