Safe Piston speed

[Zagan]

Does anyone know what the safe piston speed is for a CBR 600 RR 04 model is, or all of them I guess as it's the same engine in all of them.

it wouldn't be max rpm on the dial would it?

I've read 4500 feet per minute is safe in racing but that was around 98 or so.

[Jeff]

wow... so early in the game and already another candidate for stupid questions!!  Don't take that bad, it's an honor, really!

~160mph... 

[NewRedRider]

Does anyone know what the safe piston speed is for a CBR 600 RR 04 model is, or all of them I guess as it's the same engine in all of them.

it wouldn't be max rpm on the dial would it?

I've read 4500 feet per minute is safe in racing but that was around 98 or so.

Piston is connected to the rod and the rod to the crank. The crank is measured in RPM. Therefore, the piston should be rated in RPM?  I've never heard of a piston speed rating.

[Jeff]

Take the stroke (43.5mm), multiply it by 2 (as it's going up AND down), times that by RPM and continue calculations.

e.g., at 10,000 RPM, the piston is moving 870,000 mm/min or 2854.33 FPM (feet per min).
at 15,000 RPM, the piston is moving at 1,305,000 mm/min or 4281.5 FPM.

The big question is WHAT EFFEN DIFFERENCE DOES IT MAKE?!?!?!  The  bike is designed around a specific redline max RPM.  It's not going to exceed tolerance before that point.

[TopgunRR]

Take the stroke (43.5mm), multiply it by 2 (as it's going up AND down), times that by RPM and continue calculations.

e.g., at 10,000 RPM, the piston is moving 870,000 mm/min or 2854.33 FPM (feet per min).
at 15,000 RPM, the piston is moving at 1,305,000 mm/min or 4281.5 FPM.

The big question is WHAT EFFEN DIFFERENCE DOES IT MAKE?!?!?!  The  bike is designed around a specific redline max RPM.  It's not going to exceed tolerance before that point.

yay for math. combine these calculations with my rpm to mph breakdown ( http://www.cbr600rr.com/forum/index.php/topic,9435.msg167784.html#msg167784 ) and you can go from piston speed to bike speed! who knows why you would want to....

[600RRpilot]

where did you hear that that was correct for "racing"?  ive never heard of piston speed in relation to anything.

[Jeff]

gunRR, that way while going down the track, you can break out your palm pilot and slide-rule to figure out how fast you're going!

My pistons are special.  They go up & down really fast while moving forward really fast too...

[Audiofyl]

maybe you should pull your tach and replace it with a piston speedometer.  better yet get 4 of them, one for each piston, just incase one of them is going faster than the others.

[frankie]

pretty sure he is not coming back.

[Meddiepie954rr]

DOOD! HAHAHAHAHAHAHAHAHAHA    This thread is fucking HILARIOUS!!

[Zagan]

I'm back just can't look on here everyday.

Safe Piston speed, is the real speed of the pistons that should be safe before they start to break up or detroy your engine.

MAX RPM on the tacho can be higher than the safe Piston speed.

You may think it's a stupid question but back in 1998 4500 in MotoGP was the max limit for Safe Piston speed, in Drag racing it was 5000 feet per second.

Just wondeing if anyone has come across these figures anywhere, I guess you guys arn't in the know.

[600DubRizzle]

I'm back just can't look on here everyday.

Safe Piston speed, is the real speed of the pistons that should be safe before they start to break up or detroy your engine.

MAX RPM on the tacho can be higher than the safe Piston speed.

You may think it's a stupid question but back in 1998 4500 in MotoGP was the max limit for Safe Piston speed, in Drag racing it was 5000 feet per second.

Just wondeing if anyone has come across these figures anywhere, I guess you guys arn't in the know.

Dude, please stop because you're making it worse on yourself.

1.  Racing organizations don't set max RPM or feet per whatever period of time.  The engine builder does that.  Even if the racing organization did......
2.  .......You didn't mention which cc class was under the "4500" rule in MotoGP, or which drag racing organization.
3.  Lastly, bullets don't even travel @ 4500-5000 feet per second.  The engine would blow up as soon as one cylinder got spark.  Sucks too, because that engine would have a ton of power. 

[Jeff]

Don't get bent out of shape because we tagged it a stupid question, it's just something that people don't ask every day and it's a fairly unique question you must admit.

As for your last tag about drag racing being 5000 FPS, I'm assuming that was a typo.  In perspective, 5000 FPS on a 600RR would be better than 150,000 RPM's.  At that point you're splitting atoms...

[600RRpilot]

Don't get bent out of shape because we tagged it a stupid question, it's just something that people don't ask every day and it's a fairly unique question you must admit.

As for your last tag about drag racing being 5000 FPS, I'm assuming that was a typo.  In perspective, 5000 FPS on a 600RR would be better than 150,000 RPM's.  At that point you're splitting atoms...

i heard something about a nuclear powered 600rr coming out sometime in 2018.

[NewRedRider]

Please make it stop!!!!!!