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Author Topic: late night Rev limiter  (Read 4022 times)

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Offline blackbird

Re: late night Rev limiter
« Reply #20 on: September 04, 2016, 04:40:07 pm »
Smugs is jy in die enjin herbou game? Lyk my jy soek baie werk !
Jaag en vat kanse, moenie indruk nie, die boek is klaar geskryf!
 

Offline SmuGS

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Re: late night Rev limiter
« Reply #21 on: September 04, 2016, 04:50:50 pm »
Smugs is jy in die enjin herbou game? Lyk my jy soek baie werk !


Nee, ek maak koerante vur 'n lewe.. :imaposer:

Nee wat vlekkelose ek kuier op my lekkerste tussen die rokers,dronkgatte,vloekers,hoere en ander sondaars  :imaposer:
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Offline blackbird

Re: late night Rev limiter
« Reply #22 on: September 04, 2016, 05:16:07 pm »
OP die stadium ry Rossi om te wys hy het nie n limiter nie
Jaag en vat kanse, moenie indruk nie, die boek is klaar geskryf!
 

Offline Herklaas

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Re: late night Rev limiter
« Reply #23 on: September 04, 2016, 06:41:51 pm »
 :sip: Shame, die langebaners is nie eintlik op hoogte nie, jy rev hom tot in die limiter en dan gooi jy die kill switch vinnig aan en af, dan skiet hy saam met die limiter soos 'n 9 mil op full auto...... 
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Offline ALLEN I

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Re: late night Rev limiter
« Reply #24 on: September 04, 2016, 08:54:23 pm »
Yip i also dont understand why the neighbors complain at 02h00 when you start a bike with out an exhaust. I meen a ou just wants to show your buddies  what a "lekker" boney looks and sounds like
I mean "jislaaik" thees ous have got know consideration for us ous.  ;D ;D :imaposer: :imaposer:

 :imaposer: Like when I said to my cousin do you remember how we use to race through all the Cape passes in the 70/80's, and nowadays even a bike gets stuck in the
weekend Clarence drive car traffic. So my cousin pipes up; "And these motorists do not realize that they are on a racetrack" :imaposer:

 :imaposer: :imaposer: :imaposer:
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Offline Grumpleton

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Re: late night Rev limiter
« Reply #25 on: September 06, 2016, 07:04:47 am »
:sip: Shame, die langebaners is nie eintlik op hoogte nie, jy rev hom tot in die limiter en dan gooi jy die kill switch vinnig aan en af, dan skiet hy saam met die limiter soos 'n 9 mil op full auto...... 
:spitcoffee:

saw a youngster do that here as well with his 125 the results were a bit expensive for Dad or mom   :3some:
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Offline Manic

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Re: late night Rev limiter
« Reply #26 on: September 06, 2016, 08:37:53 am »
Question to the clever okes  :thumleft:

I was told, that a bike standing still in neutral, hitting the limiter, causes more damage on engine, compared to a bike under load in gear, and clapping the limiter at speed?
 

Offline Eendstop

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Re: late night Rev limiter
« Reply #27 on: September 06, 2016, 08:42:46 am »
Jislaaik, ons dorpie se burgers het weer erg geraas en resies gejaag Saterdag nag so 02h00 (Sondag Oggend). Hulle warmgemaakte Honda Ballades met die plat blink wiele en dik exhaust pipes kan groot geraas maak. :P

Niks bikes gehoor nie  O0

Was net Sondag self effe uitgetrap toe ek onbewustelik op 'n plaas gery en blomme kyk het in my ryery langs Shark Bay in die 2 spoor sandpaaie. Moes hom gechirp het hoekom is daar dan nie hekke en heinings om jou grond nie, maar toe te ordentlik. Moer gesukkel om die pig om te draai teen die steil afraend in die sand tweespoor paadjie. Hy reken "Ek like nie bikes op my grond nie"  :patch:  SORRY, nie geweet ek is op privaat grond nie  :ricky:
Thought so, tough behind a keyboard, but no balls.......
 

Offline Regis Laconi

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Re: late night Rev limiter
« Reply #28 on: September 06, 2016, 09:03:39 am »
Ek en my vriende het ook altyd ons bikes na moer gerev op die rallies.  Later toe ons beter bikes koop, hou ons die ou bike vir geraas maak.  Nou doen ek dit glad nie meer nie.  Ek hou wel daarvan as ander dit doen. 

Ek het jare terug op n Castrol seminar gehoor dat indien jy jou bike staan en limit, jy jou enjin lewe met soveel as 20 persent kan verminder.

Ek het al n paar bikes gesien brand slaan en motor pop...so hoe langer jy hom daar hou, hoe hoer klim daai 20 persent.
Enjoy The Freedom...
 

Offline lecap

Re: late night Rev limiter
« Reply #29 on: September 06, 2016, 09:43:48 am »
Question to the clever okes  :thumleft:

I was told, that a bike standing still in neutral, hitting the limiter, causes more damage on engine, compared to a bike under load in gear, and clapping the limiter at speed?

Rubbish. The limiter's only duty is to prevent damage to the engine. It has to do this reliably regardless if the engine is under load in a low gear or if you forget to tap off before pulling the clutch - or if you just rev the engine in N
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Offline Manic

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Re: late night Rev limiter
« Reply #30 on: September 06, 2016, 10:40:12 am »
So a Neutral limiter bike will run the same temps as the bike running at 160kph  :peepwall:
 

Offline Moondog

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Re: late night Rev limiter
« Reply #31 on: September 06, 2016, 10:43:09 am »
Pray please tell me what the fascination is with holding a bike on the rev limiter when you ar standing still.
 :xxbah: :xxbah:
.....  I also have a neighbor thatís young friend 18 years  or so has just got a new supper bike, rides it around with slops and my Gym vest to look cool and also does this ,we then come along with our bikes ......


The word in red is the one that worries me most in this thread - why is he in your Gym vest?
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Offline FrancoisTz

Re: late night Rev limiter
« Reply #32 on: September 06, 2016, 10:47:30 am »
Pray please tell me what the fascination is with holding a bike on the rev limiter when you ar standing still.
 :xxbah: :xxbah:
.....  I also have a neighbor thatís young friend 18 years  or so has just got a new supper bike, rides it around with slops and my Gym vest to look cool and also does this ,we then come along with our bikes ......


The word in red is the one that worries me most in this thread - why is he in your Gym vest?
My concern as well..
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Offline lecap

Re: late night Rev limiter
« Reply #33 on: September 06, 2016, 10:52:26 am »
So a Neutral limiter bike will run the same temps as the bike running at 160kph  :peepwall:

If you run the engine until it overheats you will obviously do damage. This will not happen quickly and does absolutely have nothing to do with hitting the limiter. Whilst standing or moving slowly you can overheat an engine without ever coming close to the red line.
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Offline OomD

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Re: late night Rev limiter
« Reply #34 on: September 06, 2016, 10:53:20 am »
Question to the clever okes  :thumleft:

I was told, that a bike standing still in neutral, hitting the limiter, causes more damage on engine, compared to a bike under load in gear, and clapping the limiter at speed?

Rubbish. The limiter's only duty is to prevent damage to the engine. It has to do this reliably regardless if the engine is under load in a low gear or if you forget to tap off before pulling the clutch - or if you just rev the engine in N
Would there not be more slap when revved to the limiter in N, as there is not anything putting a load on the engine?
 

Offline iamgigglz

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Re: late night Rev limiter
« Reply #35 on: September 06, 2016, 10:57:32 am »
Question to the clever okes  :thumleft:

I was told, that a bike standing still in neutral, hitting the limiter, causes more damage on engine, compared to a bike under load in gear, and clapping the limiter at speed?

Rubbish. The limiter's only duty is to prevent damage to the engine. It has to do this reliably regardless if the engine is under load in a low gear or if you forget to tap off before pulling the clutch - or if you just rev the engine in N
Would there not be more slap when revved to the limiter in N, as there is not anything putting a load on the engine?


I've always been told high load + low RPM or low load + high RPM cause the most damage.
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Offline lecap

Re: late night Rev limiter
« Reply #36 on: September 06, 2016, 10:59:57 am »
What is slap?

It is a misconception that an engine running in neutral runs without load. Parasitic losses at high revs are significant. Just because the rear wheel is not driven does not mean the engine does not work. The engine has to overcome internal friction, pumping losses, inertia of oscillating masses, drive coolant pump & alternator.

High load and low rpm / labouring the engine definitely causes damage.

High revs and low load does not cause damage. Neither will high revs and high load. As long as you don't over rev the engine.
« Last Edit: September 06, 2016, 11:03:50 am by lecap »
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Offline Regis Laconi

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Re: late night Rev limiter
« Reply #37 on: September 06, 2016, 11:14:24 am »
My bikes wat ek gelimit het toe ek nog n laaitjie was het nooit gebreek nie.  Solank jy jou temperatuur dop hou en n draai gaan ry sodra hy n bietjie warm raak behoort jy fine te wees.  Ek dink nie dis gesond of normaal vir n motor om so te staan en skree nie.  Die grootste probleem vir enige motor is mos maar die hitte.  Timing chains vat n bietjie van n pak en as gevolg van die hitte kan jy heat spots in jou silinder optel.  Die nuwe bikes het nickel coated silinders, so enige hitte bo 126 grade kan jou coating beskadig.

Ou bikes soos die Slingshot het n olie pyp gehaad wat onder deur die motor gehardloop het.  As die pyp te warm geraak het, smelt die pyp en val die olie op die exhaust en die bike steek brand.  Dis maar gewoonlik al wat hulle kon stop, anders skree daai bikes jul naweek en Sondag ry die ou huis toe.

Solank die gerev as " above normal usage " gesien word en die fiets n bietjie ekstra aandag kry, kan jy n motor rev laat hy bars voor hy skiet.  Natuurlik as daar klaar n piston of bearing probleem is sal die limiter hom vinniger uit wys.
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Offline OomD

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Re: late night Rev limiter
« Reply #38 on: September 06, 2016, 11:23:21 am »
What is slap?

It is a misconception that an engine running in neutral runs without load. Parasitic losses at high revs are significant. Just because the rear wheel is not driven does not mean the engine does not work. The engine has to overcome internal friction, pumping losses, inertia of oscillating masses, drive coolant pump & alternator.

High load and low rpm / labouring the engine definitely causes damage.

High revs and low load does not cause damage. Neither will high revs and high load. As long as you don't over rev the engine.

I'm sure you know what I meant with "slap". That being said, I'm not a mechanic so there's probably a better term that describe's what I meant. Let me try to explain my thoughts, though... The flywheel, for example, stores the energy of the engine. Once the rev limiter is reached the piston stops accelerating the flywheel, and in that instant the flywheel could actually drive the piston - same as when you close the throttle. Thus the connection between the conrod and flywheel, which invariably has some play, now applies force in the opposite direction. But only for a few milliseconds, until the piston starts accelerating the flywheel again, and then the force changes direction again. This to and fro change in force direction is what I meant with "slap". When the bike is moving, the load on the engine might be sufficient to not allow the flywheel (and rear wheel, etc) to drive the piston, thus no change in direction of the force.

I'm no mechanic, so I'm probably wrong here anyway. Never thought of the parasitic loads/losses as you mentioned.
 

Offline Regis Laconi

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Re: late night Rev limiter
« Reply #39 on: September 06, 2016, 02:08:38 pm »
OomD you are 100 percent correct.  You might not be a mechanic but you've got the workings of a engine correct.  No matter what anyone says.  No engine was designed to run at it's maximum rpm while standing still.  Some engines might be able to do it for years and others only a few hours.  But in the end, it's not what they were designed for.  And for that reason they will never last as long as a motorcycle under "normal" use.
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