O.S. Engines, Speed .12TZ Spec 2

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OSMG2031    Speed .12TZ Spec 2

TECH NOTES

This is the O.S. Max 12TZ Spec II (P) Pilot Crankshaft
Speed Tuned Engine for 1/10 scale racing.
Meets IFMAR specifications.

*** Due to the High Performance of the TZ Series Engines ***
***    OS does NOT provide a warranty with this engine   ***

FEATURES: Silicon filled crankshaft
Nine fin aluminum cooling head, black in color
Two-piece turbo cylinder head with magnesium outer head
Ceramic rear ball bearing
11HBS Slide Valve Carburetor (OSMG3667)
Round rear exhaust

INCLUDES: One O.S. Max 12TZ Spec II Pilot Shaft Speed Tuned Engine with P7 glow
plug (OSMG2695) 11HBS valve carb, decal sheet, instruction manual
5.5mm carb reducer, and rubber exhaust sealing ring

REQUIRES: Fuel: 10%-30% nitro (recommend starting w/20% changing to a higher
nitro content if necessary) with at least 16% lubricant
Air Cleaner DTXG2612

SPECS:    Bore:         0.543" (13.8mm)
Stroke:       0.551" (14.0mm)
Displacement: 0.128 cu in (2.1cc)
Practical RPM Range: 5,000-44,000
Power Output: 1.7 ps/35,000 RPM
Weight: 7.336oz (208g)

Distance between mounting holes same side:             0.43"   (11mm)
Distance between mounting holes opposite side:          1.2" (31.4mm)
Width not including mounting flanges:                     1" (25.4mm)
Width including mounting flanges:                       1.5"   (39mm)
Height bottom of crankcase to top of cylinder head:     3.5"   (89mm)
Height crankshaft center to top of cylinder head:       2.9" (74.2mm)
Length from front of crankcase to end of crankshaft:    1.2" (29.5mm)
Length center line of piston to front of crankcase:     1.4" (34.8mm)
Length center line of piston to front of crankshaft:    2.5" (64.3mm)
Length from backplate to end of crankshaft:             3.1" (79.4mm)
Length from backplate to front of crankcase:            1.9" (49.9mm)
Crankshaft threads: 1/4-28

COMMENTS: Some notes on slide valve and rotary carburetors:
Rotary carbs offer a larger response in the middle of the power
band. This works well for off-road applications when throttle
response must be varied.
Slide Valve carbs provide greater response at the beginning and end
of the power band. This works well for on-road and racing
applications for fast take-offs and high speed.
Many high-performance engines have short lives, as racers constantly
strive to "lean them out" for greater performance. Unfortunately,
it also makes engines run hotter, which reduces their lives.
Needle Valve (aka High Speed Needle): Approximately 2.5 turns from
closed, page 19 in manual
Mixture Control Screw (aka Low Speed Needle): Factory set where
slotted head is flush with carb body, page 25 in manual
Metering Needle: Factory set where slotted head is flush with ball
link body, page 25 in manual
Throttle Stop Screw: Approximately 0.5mm open with the reducer
removed (factory set)

ACCESSORIES

THIS IS THE O.S. MAX .12TZ SPEC II SPEED TUNED ENGINE W/ PILOT CRANKSHAFT.
FEATURES: SILICON FILLED PILOT TYPE CRANKSHAFT, CERAMIC REAR BEARING,
IFMAR COMPATIBLE, P7 GLOW PLUG, MAGNESIUM OUTER HEAD, 11HBS SLIDE VALVE CARB
REQUIRES: 10-30% NITRO FUEL, GLOW STARTER AND FUEL TUBING