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Over Rev... Where is it? What damage could I do?

  • Thread starter Thread starter Anonymous
  • Start date Start date
A

Anonymous

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the redline is at 9k, but after reading a lot of your posts I notice many of you tend to pull past even that... I'm wondering if on my GS850G (a twenty-five year old) if maybe the redline doesn't quite represent where damage might start occuring... so here's a hypothetical:

I'm running a bit rich as it is, the engine is warm, some nice looking girl pulls up next to me in her porsche (only a boxter :? ) and revs... next thing I know I'm blowing past her at 9200RPMS and just finally upshifting to second... in all honesty I feel a bit sick at this point: "what was I thinking, 25yo aluminium probably shouldn't be torn up like that even if it is still in fairly decent condition..."

should I think twice about this? the only negitive to the situation seems to be my gas cap buzzing for a few minutes (even after I've returned to a 3k cruise) -hopefully not a new engine vibration-

obviously this depends mainly on engine condition and proper lubrication, but any suggestions might be helpful - not that I plan on doing it again regardless, I'm simply more worried about damage I might have done, or could have done.
 
You probably didn't do any damage, usually what happens with over reving your engine is valve to piston contact due to valve float. Valve float will also cause a loss in power, typically before any contact happens. 200 rpm over isn't any big deal usually, but keep in mind that at that rpm, you're past your power band, so shifting is in your best interest.
 
Re: Over Rev... Where is it? What damage could I do?

Pulling 9200 on occasion isnt going to destroy anything. I wouldnt worry about it. I have gone well past that with no ill effects. :-)

Earl


PMHallum said:
the redline is at 9k, but after reading a lot of your posts I notice many of you tend to pull past even that... I'm wondering if on my GS850G (a twenty-five year old) if maybe the redline doesn't quite represent where damage might start occuring... so here's a hypothetical:

I'm running a bit rich as it is, the engine is warm, some nice looking girl pulls up next to me in her porsche (only a boxter :? ) and revs... next thing I know I'm blowing past her at 9200RPMS and just finally upshifting to second... in all honesty I feel a bit sick at this point: "what was I thinking, 25yo aluminium probably shouldn't be torn up like that even if it is still in fairly decent condition..."

should I think twice about this? the only negitive to the situation seems to be my gas cap buzzing for a few minutes (even after I've returned to a 3k cruise) -hopefully not a new engine vibration-

obviously this depends mainly on engine condition and proper lubrication, but any suggestions might be helpful - not that I plan on doing it again regardless, I'm simply more worried about damage I might have done, or could have done.
Click to expand...
 
Now to revive an old thread.
I pulled my 850g to ten grand and a bit beyond tonight and it was still pulling. As far as I know it's all stock, just has pod filters and I don't think it was jetted. The reason I think this is later on after spinning it up so high I rode with the choke on and found that the bike actually had some bottom end power! Jet kit is is I guess. Now where to find one for less than $120.00?
 
10,500 rpms on mine one time, just had to try it you know.
still going. i TRY to keep it below 9,000 now
 
Yikes. I have seen 12,000+ on mine a few times with missed shifts. I know that sick feeling...
 
Was just reading this discussion about redlining on the M/C Safety Forum -

http://www.msgroup.org/forums/mtt/topic.asp?TOPIC_ID=3396

theres a formula quoted which allows the calculation of piston speed at any given rpm. It suggests that 4000ft/min. is the maximum safe speed for a m/c piston before nasty things start to happen with the rings. I just did a quick calc. for a GS850 and it comes out at about 11000 rpm.
I agree with Mark - 7K rpm is more than enough for normal highway riding.
 
I've buried my tach with missed shifts before, over 13k. Spun the adjusters out of a couple of rockers making me think I had screwed up worse than I had.

With the mods to my bike it pulls hard after the 10k redline. It will get to 12.5k in a hurry if you fall asleep.
 
Over Rev... Where is it? What damage could I do

Over Rev... Where is it? What damage could I do

What color was the Porsche?:-D
DH
 
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