is it safe to o past the redline

[RedShift]

i just want a 19 or 18 front but now one has them, what is the bigest for the front? I GUESS I WILL GO DOWN IN THE REAR  damn caps i am not going to fix that, soo.

I haven't noticed anyone offering an 18 or 19 Tooth front sprocket. The tallest I've found is a 17, documented in my Adding a Tooth -- Going Up to a 17T Front Sprocket thread.

I've been very pleased with this change, but going up a tooth seems to be counter to the prevailing opinion.

[banner]

Okay if your bike is wobbling then there is something amiss. I wouldn't ride it until i knew what it was. It could be tire pressure, something loose in the front end, maybe something loose in the chain adjustment area?. Please give the bike a good looking over.

[onefastgs500]

overrevving can gain you a couple of kliks an hr but i've spent a lot of dyno time with gs's and a stocker signs off making power BEFORE 10k(98-99rpm) so what's the point.




oh and i prolly overrev my racebike every race

[annguyen1981]

Take an engineering or physics course and you'll wish the US used the metric system. (easier calculations) 

+1 on this...  Mostly factors of 10.  (maybe everything)

[RedShift]

Take an engineering or physics course and you'll wish the US used the metric system. (easier calculations) 

+1 on this... Mostly factors of 10. (maybe everything)

Totally agree.  With the exception of fuel efficiency.  I mean, who the heck prefers Litres per 100 Km as a measurement?  When I buy a litre of gas, I want to know how many kilometers I can go with it.  I can't get my mind around why they want the inverse and scaled to 100 km.   

[galahs]

Yeah its funny that they inversed the scale.

"Kilometers per litre"

hmmm, sounds wierd. But I guess it isn't used because the resulting fiure sounds too small.

28.5 kilometers per litre

or

3.5 Litres per 100km's


I think with litres being a smaller unit size than a gallon its easier to differentiate consumption when using Litres/100kms (once your used to it)

For example my 3.8L V6 Holden Commodore is averaging 11L/100kms where as my GS averages about 4L/100kms.

[deathlucky]

arrr stuff it i will just get a fireblade

[Egaeus]

Don't forget the life insurance. 

And be sure that when you get it, you sing, "Yo ho, Yo ho, the pirate's bike for me."

[werase643]

stock GS to slow....get a BUSA

[domas]

OK first dont over rev the engine. Valves do float and engine does get damaged.
Look at this dyno run of GS:
http://www.gstwin.com/dyno_run.htm

You can see that power goes downward after about 9200 rpm. So reving more than that will actualy make you go slower. When youare traveling in 6th gear 180 kmh @9000 rpm you are at your peak horsepower output and it wont go any faster. If you change to 15tooth sprocket you will go @ 9600 rpm at 180kmh and as you can see from chart you engine will make less power.

So the next time you see your bike in 6th @ 9200rpm, relax and understand that GS is giving all she got for you at that moment. Trashing it  in 5th not only will it make you go slower but also damaging your engine.

Also looking at the chart you can see that top acceleration can be achieved shifting at 9600 rpm and droping down to about 8600 in new gear. The revs up untill 11000 are made for forgiving your shifting errors, not making more power.

And no there is no rev limiter on GS. ( Maybe because it is not EFI? Anyone heard of rev limiter on carbed bike? )

[LimaXray]

And no there is no rev limiter on GS. ( Maybe because it is not EFI? Anyone heard of rev limiter on carbed bike? )

Aside from a fuel-cut rev limiter that could be implimented with EFI, there are also ignition rev limiters.  There are 2 kinds of ignition rev limters: soft and hard.  A soft rev limiter will pull back ignition timing causing a loss in power to hopefully alert the driver to shift.  A hard rev limiter will totally cut ignition (and/or fuel in the case of EFI) and thus preventing you from revving any higher.  Generally, a soft rev limiter is placed before a hard rev limiter so if you keep on revving past the soft limiter, or hang out in the soft limiters RPM range for too long, a hard rev limiter will kick in forcing you to stop being a moron.

I kinda wonder if the 04+ has a rev limiter, the electronics are more 'with the times' so implimenting an ignition rev limiter wouldn't take much for Suzuki.

[rangerbrown]

the 2004 up does, while ont he bed of the truck (when i was new at this stuff) i didnt see that the throttle was open because of the tie down strap.

i started it, and went right to red line and was bouncing back and forth, lasted 3 secs as i shut it down very quickly

[sledge]

Do you seriously think its safe to rev past the redline? Its there for a reason. Ever heard the term "Mechanical Sympathy"? When the GS engine was first designed and prototyped the designers in the office at Hammamatsu will have identified the maximum safe operating speed of the engine that doesnt compromise reliabilty and put a redline on the tacho to correspond with that speed. Its just common sense to me, you go past the redline, the valves  bounce and the con-rods try to make a bid for freedom via the cylinder walls!! When you have a bath and you open the red tap up full do you have to ask someone if the water will be hot? Get real!!

[Reddog787]

The redline is the point where the engine stops producing usable power.  Reving in the red zone will damage the engine, however the head gasket is usually the the first to go and is easily replaced.  After that major damage is done to the piston rings, valves, and cylinder.  If your bike needs a fresh rebuild - then rev away and ride it like its stolen.

Rev limiters only help decrease damage, but damage can still occur.  Ask me how I know. 

[GeeP]

The purpose of the redline is as Sledge stated:  It is the maximum safe operating speed.  Past this speed it has been determined that some part of the engine will become over stressed. 

Page 590 of "The Internal Combustion Engine in Theory and Practice, Volume 2:  Combustion, Fuels, Materials, Design" by Charles Fayette Taylor states the following:  "In 4-stroke engines the maximum allowable piston speed is often limited by the valve-gear rather than by the crank-rod piston system."

This adds merit to what the racers on this site have to say about the GS engine above redline, mainly that the valves begin to interfere with the piston at about 11,500 to 12,000 RPM.  It also appears that crankshaft failure is due to increased power output (possibly harmonics), not overspeed.

That said, the dyno run shows that there is little point in shifting much after 9k RPM.  The only reason to be going past 9,500 RPM is if you run out of gears.   

[rangerbrown]

ok math geaks, if the gs is reving at 10,000 rpm. what is the peak speed form for it turns around and does it again?

you have 10 mins to answer,    GO!!!

[Turd Ferguson]

Reving in the red zone will damage the engine, however the head gasket is usually the the first to go and is easily replaced.

I've never heard of that.  Unless you are talking about excessive heat warping the deck, how is a head gasket affected by over revving?  Over revving does not cause high cylinder pressures that would cause a head gasket failure (in most cases).  As GeeP stated, "redline" usually first affects the valve train (yup...valve float, I've heard my 2005 GS500F float once on accident).  In 75% of other catastrophic failure cases that I've observed, over revving has caused the rod bolts to stretch and things go from there.

-Turd.

[Turd Ferguson]

ok math geaks, if the gs is reving at 10,000 rpm. what is the peak speed form for it turns around and does it again?

you have 10 mins to answer,    GO!!!

Uhh...?  I lost my decoder ring...what does that post mean?

-Turd the math geek.

[rangerbrown]

the piston, is moving. how fast in mph/kmh
at 10000 rpm

[rangerbrown]

You got a stroke of 56.6mm=2.23" to work with, its going that far X 10,000 per min, but what is  avg/peak speed