Four cycle engine

April 2, 2013
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Four cycle engine from 1905

IMPORTANT NOTE: The K&B 7311 glow plug works perfect in HP VT four stroke engines. Don't use R/C, 4 cycle, miracle, wonder or any other plugs that have anything extending from the end. These plugs can hit and destroy the rotary valve. Early VT 21's use a standard short plug like the K&B 1S 7321. You can identify the early version by the rotating valve, early used a bronze valve in a chromed sleeve, all later engines used a chrome valve in a bronze sleeve.

VT .21 SPECIFICATIONS
Displacement
Weight

9.5 oz
Prop Size

8x5; 8x6; 9x5; 10x4
Prop Nut Thread

1/4" x28
Piston/Cyl Type

Dykes Ringed ABC
Crankshaft

Hardened supported by two ball bearings
Valve Type

Hard Chrome Rotary in bronze sleeve
Valve Train Drive

Bevel and spur gear via shaft

Carburetor Type

Twin Needle
Glow Plug

K&B 1L 7311 Std Long
See note a bottom of page about glow plugs in VT engines
ULTRA QUIET!
HP's unique design of four strokes are the quietest made. In fact, the VT 21 rivals an electric. Both engines are equipped with suburb mufflers that easily meet all DB requirements.		 EXACTING TOLERANCES!
HP engines have always been renowned for their unsurpassed quality and precision. This tradition continues as all HP four cycles are produced with the latest computer controlled machines in our Southern California facility.
SUPER SMOOTH
!HP has always been known as the smooth runners. The one piece hardened steel crankshaft with a massive counter weight is supported by 2 ball bearings. A light alloy forged conrod and cast piston are balanced perfectly. You'll be surprised just how smooth a engine can be.		 OVERHEAD BBC rotary valve technology
Bronze, Brass, Chrome. HP pioneered rotary valves in model engines and utilize a true hard chrome valve running in a bronze sleeve. This arrangement never requires adjustment. No valve float and or power robbing valve spring tension to overcome.
Source: www.mecoa.com
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