HP Four Stroke Engines
HP  VT.25 Four Stroke

FOR THE FIRST TIME EVER, you can buy an American made four stroke
and have the support of a major American engine producer.
This way you're assured the highest quality parts and
technical support because you deal with the people that make'em.

The Most Unique Design of any Four Cycle
Available Today!
FEATURES
•  Roller Bearing Head
•  Ringed ABC construction
•  Dual Ball Bearings
•  Slide Valve Carburetor

So quiet you'll rival the electrics!

Price & Availability

 

 

SPECIFICATIONS
   
VT 49
Displacement  
.49 cu.in (8ccm)
Bore  
0.898
Stroke  
0.772
Power  
.75 hp
RPM Range  
2500 ~ 13,000
Piston/Cyl Type  
Conventional Ringed ABC
Weight  
17.3 oz
Prop Size  
10x6; 11x5 12x4
Features: Ringed-ABC construction • Double ball bearing supported crankshaft • Rotary Valve porting • Two year warranty
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.
   
OVERHEAD ROTARY VALVES!
 

BBC (bronze, brass, chrome) rotary valves never require adjustment. No valve float and or power robbing valve spring tension to overcome.
   
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.
   
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 RJL's Southern California facility.
   
Optional roller bearing supported valve
  Rather than the standard bushing, you can purchase the bearing head version to take the upward force of the valve during combustion. Both engines provide the same power, however the bearing head is less critical on the oil scavenging from the exhaust.
   
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 provides the longest wearing and least friction of all metallurgy in this high temperature area.
   
ABC ringed piston & cylinder assembly
  A high silicon piston fitted with ring runs in a hard chrome plated brass sleeve that is precision ground to .0001 of an inch on both the inside and outside diameters.
   
Forged & bushed connecting rods
 

Each VT connecting rod is forged from high strength aircraft grade aluminum alloy then precision machined and fitted with bronze bushings at both ends.

   
Precision Crankshaft
  Produced from solid bar stock with large counterbalance and then fully heat treated, these crankshafts are then precision ground to a tolerance of .0001 of an inch. This is why HP engines are known as the smoothest runners.
   
Ball Bearings
  All VT's are equipped with double ball bearings on the crankshaft. The front is sealed on both sides eliminating blow by and rusting that is common in four cycle engines.
   
High pressure castings
  All HP engines are pressure die cast from aluminum alloys. These castings are made by forcing molten aluminum into high strength tool steel dies at pressures as high as 3000 psi.
 

 
 

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