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| *Vultures Knob>>>Sport Bike |
Motorcycle RPM? |
can any bad come from cruising at a really high RPM on a motorcycle. what is the best time to shift, (RPM wise) on a motorcycle? cause I have a sport bike and I usually shift around 5 to 6 RPMs (thousand you know). just wondering the ideal time to shift and would there be any engine damage at going higher than that. I know that your not supposed to redline it because that could cause damage but other than that. The higher the RPM the more wear occurs. If you run around at 7,000 RPM all day than you will have more engine wear than running around at 4,000 RPM. Each type of bike is different on where that "sweet spot" is for cruising. My V-Twin sportbike likes to run between 3,500 RPM and 4,500 RPM when at a steady speed. Inline bikes like 4,000 - 6,000. You just have to find that sweet spot on your particular bike where is just "feels" right. if it is a newer bike, it will hav a rev limiter to prevent top end damage. Most 4 cyl bikes can shift at 9-11000 without damage Running the motor at higher speeds can cause some oil consumption. It really depends on the motor. My 1-cyl 4-stroke 650cc dirtbike doesn't rev very high at all. Not sure what it turns but 7k would be pushin it pretty hard. But then a crotch rocket can turn 12k easily. It depends on how fast your accelerating and the powerband of the motor. Cruising a sport bike I would prob turn 3-5k and accelerating near the same maybe a little higher. What kind of bike is it... motor size? well, as long as your oil is changed regularly, and your shifting is okay (using the clutch lever and shifting firmly) it shouldn't matter where in the RPM range that you operate in. Running it at high rpm simply makes for a 'buzzier' motor with more vibrations (not to mention the higher noise level). Conversely, running the bike at too LOW of an RPM can cause extra strain on the engine. Most bikes have a 'sweet spot' to ride in and you'll find it after a few hundred miles of riding. The shift should be made just prior to the engine rpm's flattening out. No engine damage will result unless you continually exceed red line limits. I always figure the red line is the shift point on any car or bike they all have rev limiters if you put just a little upward pressure on the shifter it will automatically shift up when your rev limiter causes the engine to hesitate. when I build a stroker I calculate the red line at a piston speed of 4000 linear feet per minute & set the rev limiter at that rpm. the rings and cylinder in all engines are made of the same material theres no magic involved & for me 4k ft per min is a safe speed for a reliable street engine for a strip engine there is no limit because it only has to last a few seconds between ring jobs. wheather your stroke is 2 inches or 5in. just multiply it times twice your rpm and devide by 12 for ft. per min. you can calculate it from there. |
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