Nitro Engines Spower B7TT Speed Factory Tuned .21 nitro engine août 1, 2024 by Chris Laisser un commentaire Spower have announced the release of their new B7TT Speed Factory Tuned .21 nitro engine. Made by O.S. in Japan, the power plant was tested and carefully selected to give you maximum performance and run time. It is a long-stroke engine that offers quick response at low speeds and more torque in the mid end with consistent idling. The latest Spower B7TT Speed piston/liner comes in a conventional 3-port configuration enabling smoother torque throughout the power range. Shopping! Wartelle Shop Shopping! Donuts Racing The engine’s crankshaft has 2 tungsten counterweights contributing to a consistent idle and quick RPM response according to the throttle movements. The B7TT Speed also has the latest technology rear thrust plate with surface treatment embedded in the cover plate. This is to reduce friction against the connecting rod and to extend its life. The crankcase of B7TT Speed is redesigned with a new boost port and a new exhaust port for optimum air flow. Specifications: Displacement: 3.49cc Power Output: 2.65ps/2.61 hp / 33,000 r.p.m. Bore: 16.27mm (0.641 in.) Stroke: 16.8mm (0.661in) Practical R.P.M: 3,800~41,000 r.p.m Weight: 350g (12.40oz.) Source: SPower PartagezTweetez0 PartagesAbout ChrisFounder of circusrc.com, journalist & photographer in the RC world for several years, Chris is passionate about RC, racing and technique. Whether in France or in the world, he is trying to bring high-quality information and photos for enthusiasts... and make you want to join the world of RC!