Honda's BLAST

Honda's completely redesigned BF40 and BF50 EFI four-stroke outboard engines have electronic fuel injection, Honda's revolutionary Boosted Low Speed Torque (BLAST) air/fuel ratio and ignition-timing technology, and Lean Burn Control to deliver powerful start-up and acceleration together with outstanding fuel economy during cruising.

BLAST, along with a newly-designed, streamlined gear case and other improvements, contributes to greater acceleration and a higher top speed, while Lean Burn Control results in a 22 per cent improvement in fuel economy over the previous models.

The new models are compatible with Honda's latest general purpose engine diagnostic system (Dr H) and also feature a new one-touch plastic cap, which permits easy inspection of anode wear inside the engine, for significantly improved ease of maintenance.

Consistently leading the world in environmental performance, Honda has also managed to reduce noise levels by 1.0dB over previous models through such improvements as a longer exhaust pipe and an optimised rib design inside the upper portion of the extension case.

Both models exhibit outstanding environmental performance and exceed: 2008 CARB emissions standards - the most stringent in the world; US EPA standards for 2006; and, domestic Japanese voluntary regulations.

As is the case with every other model in Honda's outboard engine range, the new BF40 and BF50 also achieve the Outboard Engine Distributors Association's (OEDA) three-star rating for ultra-low emissions.

Honda's product concept: are the lightest and most compact outboard engine it its class; have long branch plastic inlet manifold; small electrical parts (O2 sensor, etc); high output; large bore throttle body; adoption of BLAST; excellent fuel economy and ultra-low emissions; PGM-FI and Lean Burn Control; full complement of accessories; long tiller handle with angle adjustment function; four-bulb warning lamp (tiller model only); and can be connected to Honda's new diagnostic unit (Dr H).

Honda's revolutionary Boosted Low Speed Torque (BLAST) air/fuel ratio and ignition-timing technology was first employed in Honda's BF75/90, released in September 2006.

BLAST utilises MBT - Minimum advance for Best Torque - trace control, which is based on basic engine ignition timing theory. By linking the ignition timing control of the engine to the air/fuel ratio, it sets the optimum timing via computer control (see diagram).

BLAST traces the air/fuel ratio that results in the maximum torque for each engine revolution, while simultaneously tracing the maximum knock limit ignition timing that can be obtained using a rich air/fuel ratio in the full-throttle zone, and advances the ignition timing to the limit (27?) in order to produce greater torque.

This boost in horsepower and torque at low rpm contributes to strong holeshot performance to get the hull up on plane quickly!

BLAST ensures strong acceleration to get boats on the plane quicker!