OS Max OSM13980

This is the O.S. Max 30VG(P) SR Rear Exhaust Monster Truck Engine
with Pilot Type Crankshaft.
This version is designed to use the
#87110 HPI Savage Roto Starter (HPIP8711), see COMMENTS.

FEATURES:

Same mounting dimensions as .21 size engines making upgrading easier
Advanced Bi-Metallic Liner (ABL) cylinder construction.
This process uses a double layer of plating material rather than
one thick layer. This helps the metal bond to the cylinder and is
more durable. Also, the plating process is more consistent,
resulting in a more precise fit between piston and sleeve for
better compression and longer life.
Machined aluminum piston, 3-port cylinder liner and double bushed
knife edge connecting rod
21E single needle Slide Valve Carburetor (OSMG2456) with insulated
sleeve to prevent fuel vaporization
SG (pilot) type oversized crankshaft with rubber-sealed front bearing
and oversized rear bearing to handle high torque loads

INCLUDES:

O.S. Max 30VG(P) SR Rear Exhaust Monster Truck Engine with
Illustrated Manual, #8 Glow Plug and #203 Air Filter, Two Foam
Filters

REQUIRES:

Car blend nitromethane fuel with 10-30% nitromethane content, 20%
nitro content recommended as starting point
Most of the fuels we carry meet or exceed the lubricant content
required for optimum performance and maximum engine life. In the
past, the conventional lubricant content used in fuel was 18%. But
with new advanced technologies, fuels like Red Alert and O'Donnell
for example, have a better quality of lubricants even though the
percentages of lubricant content are lower. These high-tech
lubricants provide exceptional cooling and protection.

SPECS:

Displacement: 0.298 cu in (5.0cc)
Bore: 0.728" (18.5mm)
Stroke: 0.717" (18.2mm)
Practical RPM: 4,000-36,000
Power Output: 3.0 ps/28,000 RPM
Weight: 14.1oz (399g)
Crankshaft Size: 1/4-28
Factory Needle Valve Setting: 2-3/4 turns OPEN from fully closed
Distance Between Mounting Holes Same Side: 0.83" (21mm)
Distance Between Mounting Holes Opposite Side: 1.4" (37mm)
Distance Between Mounting Holes Diagonal: 2.3" (59mm)
Height Bottom of Mounting Ears to Top of Cylinder Head: 3.8" (97.7mm)
Width of Mounting Ears: 1.8" (45mm)
Width of Crankcase Below Mounting Ears: 1.2" (30.8mm)
Distance from Front Bearing to End of Crankshaft: 1.2" (29.5mm)
Distance from Center of Engine to Front Bearing: 1.7" (44mm)
Distance from Center of Engine to Backplate: 0.84" (21.3mm)
Starter Shaft Diameter: 0.24" (6mm)

COMMENTS:

To install the #87110 Savage Roto Starter remove the backplate
unit (#87126, HPIP7126) from the Roto Starter and install on engine
To use the Roto Start for the Nitro Star K Series on this engine
the #87117 (HPIP8717) back plate must be purchased. The stock
back plate will not fit.
*To use this engine on the Nitro Warhead use OFNG0098*
jxs 10/17/05
update rrb 2/21/06

this information was sourced from Great Planes Model Distributors