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Hartley Enterprises specializes in custom high performance engines for sport and competition use.  The engines incorporate advance motorcycle engine technology to give unparalleled high horsepower and low weight. 

 

BOLT 4

The BOLT4 is a 16 valve L4 engine.  It utilizes the Suzuki Hayabusa head and incorporates race car  features such as a high capacity alternator, flywheel with an automotive race clutch, adapter for Hewland and other gearboxes, robust crankshaft, advanced dry sump oiling system and low crankshaft center height . 
 
See BOLT 4 Specs. page for details. (CLICK HERE!)
 
 
 
 
 
 
 
 
 
 

H1 MAXI V8

The MAXI is the largest and most powerful compact V8 available.  This 90° V8 utilizes motorcycle technology for the heads, flat plane crank and a robust bottom end to insure durability. 

The unique cam drive reduces the engine length and it retains separate cylinders for flexibility in bore size and rebuild.  Presently it is available in displacements 2.5 to 3.3 liters, and a 3.5 liter version is planned.

 

See H1 MAXI V8 Specs. Page  for specifications details  (CLICK HERE!)

See H1 MAXI V8 MFG Page  for manufacturing details   (CLICK HERE!)

 

 

 

See the updated GALLERY page for examples of applications and technical details! 

 

Last update 11/2019

 


 

  Hartley Enterprises working on the following projects:

  • 2000cc V4 engine for race applications
  • 900cc 3 cylinder high efficiency engine The target market is power generation for plug-in automobiles.  Design goal is 80 hp continuous and 50% thermal efficiency using improved adiabatic combustion and unique combustion pressure control.