HPI Racing F3.5 Manuel page 6
8,
Optional
Tuning
Glow
Plu
50—735
How Glow Plugs Work:
Unlike full sized car engines that use spark plugs and a distributor to fire the cylinders in the combustion cycle, glow engines rely on glow plugs. In a Nitro engine,
i"tion
is initiated by the application of a glow igniter. When the igniter is disconnected, the heat inside the combustion chamber keeps the glow plug filament
POWER
PCLJG
Outdoor Temp
Glow
Glow Plug Cold R5
50—735
3—JbF
Glow Plug Medium Cold R4
40—732
83
Glow Plug Medium R3
50—735
When to replace
the glow plug:
Fuel and temperature will have an effect on the performance, reliability and life span of the
w plu
flo
g an
d theref
ore shoul
d
be take
n into c onsiderat
dure there are several signs that can indicate the plug should be replaced
*Plug filament/plug bodyisdiscolored or thesurface isrough.
* Engine cuts out when idling.
Air Filter
1774JL,5—
Proper Air Filter Maintenance:
Ditt is the biggest enemy of a nitro engine and proper air filter maintenance is one of the most important factors
that uäll effect your engines longevity If you are using the air filter supplied with vour kit, we recommend cleani
elementafterevety run.If you are usingan after marketair filter,pleasefollowfhe manufacturers recom,me
Regardless, it is always a good habit to check the element after every nm to make sure it is propeny seated in the
filter body and that the body is fully seated on the carburetor. Never run the engine without the ait-filter!
1774
a
a
Reinstalling
The Air Filter:
After property cleaning the filter element make sure it is reinstalled
correctly. If you are usmg the filter that came with your kit, follow the
illustration to reinstall the filter element in the filter body. Make sure
there are no gaps between the element and body
fully seated on the carburetor and secured with a tie strap (HPI part
#6154).Never run the engine without the air filter!
1774
keeping the engine running. Ignition timing in a glow engine is automatic. At higher RPM's the plug becomes hotter, firi
the t iming.
At l ower RPM's
proper plug selection and maintenance are cruaal for an engine to pefform property
Glow
PI
Characteristics
Cpld A A *ver and will l ast
longer at high temperature.
R5
R4
Hot plug will stan engine easier and
keepit morestable for tuning. But will
fail soonerat high engine temperature.
RS
ion
Aside from b umout
* Plug filament is distorted or bent.
* Engine becotnes difficult to start
Cleaning
zoo
Remove and clean the air filter with nitro fuel when soiled. Spray fuel through the clean side to ensure proper dirt
Air Filter
Oil
removal.Squeeze the filter to remove excess fuel. To re-coat the air filter with oil, place the element in a plastic bag
with several drops ofair filter oil. Using your fingers, work the oil into the element making sure it is evenly distributed.
0
871990
The filter must be
€6
Z543
the p lug b ecomes
cooler,
firing the f uel/air
Proper Glow Plug Selection:
=
glow*ålecfion
yeffect performance.
foridealdrivingconditjmisffEkey. TWs 'A help
Tomaximize and extend thelifeofyourglow•plug follow these simple tips:
*Rermve theWow Vilterwhen using morethan1/2throttle oriftheengine ches notstartafter a few' seconds.
*Do notruntheengneJean. Lean confins
* Use the best Fuel/Aug combination for vamng driving conditions.
Use
a fuel that
has a lower
Glow Plug
or plug
40—735
HOT!
Pliers
Glow PlugIgniter
the
The Filter Element:
871990
871990
872040
4
M3x8rw•n
61
6
mixture
later, effectively
depends
on several
factors.
Fuel type n itro methane
Fitüngthe best c ombinåbon
ofnitro f iel and pligtemperature
overheat the
causing theelement tobedamaged o r fail.
nitro
content
Filament
Good
Plug
Bad Plug
Eknenz may be damaged
Never run the engine without the air filter!
74
6154
871990
Note:
0K!
the
retarding
the t iming
tgnce
content,
weatter,
and
Bad Plug
Ehmæu
or
up
up
