variable valve timing.... - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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Other Motorcycles Forum for you to discuss anything about any other motorcycles. Good place for former (and soon to be) V-Strom owners to keep on the site even though they are without a strom.

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  #1  
Old 12-12-2012, 02:13 AM
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Default variable valve timing....

My Honda S2000 has a V-TEC engine(variable cam/valve timing) which is becoming more common on other manufacturer's engines as well so it's nothing new. The engine in this application is further unique in that the engine block is very light using F1 technology that Honda utilizes called FRM(Fiber Re-enforced Metal) which allows closer proximity between the cylinders which allows for less metal to build the block=less weight and stronger block. I was thinking that at the least, Honda would apply the FRM technology to motorcycle engine cases to reduce weight and add rigidity. But, why not the variable valve timing design? Perhaps it's because of that sudden burst of power when the more aggressive profile takes over....say in a turn? While the V-Tec engagement in my S is pretty intense, perhaps the mortorcycle makers could design one that would be less abrupt and maybe only active if the bike is vertical, or near vertical, and under full throttle for safety. I find it hard to believe that Honda hasn't looked at it. It sure would come in handy when trying to make a quick pass...uphill on the Wee when loaded two-up with luggage. Hmmm...perhaps a push-button switch on the left grip area that could only activate the system under certain coniditions? I DO understand about the R&D $$$ that would be required for such a design, but I find it interesting to consider the possibilities.
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  #2  
Old 12-12-2012, 05:20 AM
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I'm pretty sure that some of the VFR Interceptors (800cc) that Honda made had Vtec.
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Old 12-12-2012, 08:10 AM
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My friends with VFR's seem to not like the V-Tech system much. Some are OK with it. But Honda is always on the frontline of technology. Sometimes thier products aren't the most exciting, but always work like they should (not that they have never had problems). I don't have a Honda, but would sure like to try one of thier V-Tech bikes.
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Old 12-12-2012, 09:15 AM
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My VFR ('01) had VTEC, and it worked exactly as you described. A lot of people hated it, but I thought it was an absolute blast. Whack the throttle and the revs take off, then just when you think it's peaking, WHAM, I'd get a huge power hit and the front wheel would come up. It reminded me of the 4-barrel carbs they used to put on muscle cars.

As for non-metal engines, the last version of the Britten super-bike had carbon-fiber cases. He was working on making more and more of the engine composites. I doubt production bike costs will permit that technology for a long time; aluminium is too cheap and easy to work with.
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Old 12-12-2012, 10:22 AM
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Variable valve timing is mainly a help for fuel economy at lower power. That sells cars, but isn't a big selling item on motorcycles while adding to the manufacturing cost.
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Old 12-12-2012, 10:51 AM
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The Concours 14 has it. There are many lovers of that fine machine...
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Old 12-12-2012, 01:02 PM
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Quote:
Originally Posted by enumclaw View Post
The Concours 14 has it. There are many lovers of that fine machine...
Yup!
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Old 12-12-2012, 01:32 PM
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Maybe its the cave man in me but I would rather go back to carbs on bikes. Maybe a 1 bit cpu for the spark plugs...but points would be ok too. No fuel pump, just mount the tank higher than the carbs and she should be just fine. Kick starter for sure, and if the whole electrical system shits it would still run for quite some time.

I would leave my GPS at home and just use maps as I reflect about the good old days.

Bet I would get home every friggin time.

I bet you really do not care about my feelings on more electrical crap for bikes.
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Old 12-12-2012, 02:09 PM
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Quote:
Originally Posted by Scott E. Bonds View Post
Maybe its the cave man in me but I would rather go back to carbs on bikes. Maybe a 1 bit cpu for the spark plugs...but points would be ok too. No fuel pump, just mount the tank higher than the carbs and she should be just fine. Kick starter for sure, and if the whole electrical system shits it would still run for quite some time.

I would leave my GPS at home and just use maps as I reflect about the good old days.

Bet I would get home every friggin time.

I bet you really do not care about my feelings on more electrical crap for bikes.
Part of the reason I have so much love for my air-cooled, carbureted Triumph. Maybe not quite as rustic as you describe, but it does the trick. Sometimes simplicity is bliss.
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Old 12-12-2012, 08:19 PM
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Thanks for info. I had no idea that ANY motorcycle had a V-TEC system!! It's always great for me to learn something.
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