Evolution 91NX Glow Engine w/Muffler

This item is discontinued and no longer available for purchase. You may want to search our site for a similar item.
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Low Price: $179.99
Discontinued Online

This is the Evolution 91NX Glow Engine. The Evolution .91NX is a revolutionary choice for modelers that demand quality, power and reliability from a pint sized powerhouse. This single-cylinder, 2-stroke glow engine provides the performance of a .91-size engine in the case size of a .61-class engine, allowing you to shoe horn more power into smaller, lightweight aircraft. The awesome power of the .91NX engines makes it possible to add a higher level of performance versatility to your .61, .75 or .91-size airplanes. This gives you more power on tap for 3D maneuvers, and war bird strafing runs can reach speeds faster than you ever thought possible.

Evolution glow engines are engineered for hands-on modelers who believe there's no replacement for displacement. Their awesome power-to-weight ratios and smooth operation make any flying experience, be it 3D, sport or scale, the best it can be. And they all benefit from ball bearing-supported crankshafts and the proven durability of ABC cylinder construction (aluminum cylinder with brass, chrome-plated liner).


  • Smaller size and lighter weight than typical .91 displacement engines to deliver a higher power-to-weight ratio
  • Fits the same mounting pattern as the .61NX engine
  • Smooth operation that's easy to tune
  • Dual ball-bearing support and ABC construction for performance and longer engine life

: 2-stroke airplane engine
: 0.91 cu. in. (15.00 cc)
: 1.09 in (27.8mm)
: 0.98 in (24.9mm)
: Single
Total Weight
: 20.0 oz (570 g)
Engine (Only) Weight
: 15.3 oz (435 g)
Muffler Weight
: 4.7 oz (135 g)
Crankshaft Threads
: 5/16 x 24
Benchmark Prop
: 14 x 7 @ 10,700 rpm
Prop Range
: 13 x 715 x 6
RPM Range
: 2,00015,000 rpm
: 1030% nitro fuel, 1618% oil
Muffler Type
: Expansion chamber


  • 91NX Engine
  • Muffler System
  • (2) Exhaust Gasket
  • Hardware and L Allen Tools

This product was added to our catalog on March 19, 2013.