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Old September 17th, 2016, 06:33 PM   #1
Motofool
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Arrow How VTEC works

Valves opening higher and longer at high rpm's: Easier breathing.
It was invented by Honda engineer Ikuo Kajitani.
It has been used in motorcycles and cars.

Copied from here:
https://en.wikipedia.org/wiki/VTEC

VTEC in motorcycles

Apart from the Japanese market-only Honda CB400SF Super Four HYPER VTEC, introduced in 1999, the first worldwide implementation of VTEC technology in a motorcycle occurred with the introduction of Honda's VFR800 sportbike in 2002. Similar to the SOHC VTEC-E style, one intake valve remains closed until a threshold of 7000 RPM is reached, then the second valve is opened by an oil-pressure actuated pin. The dwell of the valves remains unchanged, as in the automobile VTEC-E, and little extra power is produced, but with a smoothing-out of the torque curve. Critics maintain that VTEC adds little to the VFR experience, while increasing the engine's complexity. Honda seemed to agree, as their VFR1200, a model announced in October 2009, came to replace the VFR800, which abandons the V-TEC concept in favor of a large capacity narrow-vee "unicam", i.e., SOHC, engine. However, the 2014 VFR800 reintroduced the VTEC system from the 2002-2009 VFR motorcycle.

Honda incorporated the technology into the NC700 series, including the NC700D Integra (motorcycle/scooter hybrid), released in 2012, using a single camshaft to provide two timing routines for the intake valves.


Link to original page on YouTube.

Link to original page on YouTube.

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Old September 17th, 2016, 06:35 PM   #2
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Awesome! Thanks for sharing.
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Old September 18th, 2016, 05:17 AM   #3
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great info, i used to have a civic si that has vtec. Fun little car.
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Old September 18th, 2016, 07:13 AM   #4
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When that vtech kicks in though
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Old September 18th, 2016, 07:35 AM   #5
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Quote:
Originally Posted by JohnnyBravo View Post
When that vtech kicks in though
I LOVE my VFR 800!!! The VTEC is an amazing kick. However; in so many of the corner speeds I have around here: it had a bad habit of initiating at the precise moment I would begin to roll on the throttle mid turn!!! I solved the problem (and the unplanned pucker!) by dropping the front sprocket one tooth. That had the effect of raising the engine RPM just enough so the VTEC was already initiated so there is no longer an unexpected surge of power at a critical moment!
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Old September 18th, 2016, 01:55 PM   #6
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Smart thinking!
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Old September 18th, 2016, 06:40 PM   #7
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I had a VFR 800 and loved it. Everything about that bike was great.
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Old September 18th, 2016, 07:52 PM   #8
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