Woopa!! Cbr1000rr Riders

[BlackHonda]

Here's what ive ordered for my fren from USA

within a week it was shipped to me

http://i23.photobucket.com/albums/b361/Blackhonda666/IMG_1934.jpg

http://i23.photobucket.com/albums/b361/Blackhonda666/IMG_1933.jpg

http://i23.photobucket.com/albums/b361/Blackhonda666/IMG_1935.jpg

[Saufi]

Coolz,...

How much does the fender eliminator cozt,..???

[Wayang]

So if I read the article below right, and if the article is accurate, doing the mod will not help. At lower RPM, the closed valve will allow for higher velocity.

 

So it seems Honda also employs the "simpler and less effective method" like the BMW and Nissan as compared to Ferrari.

 

I guess this is why after switching to aftermarket pipes, you lose the bottom end but gain at the top end, because the exhaust valve is removed.

 

Backpressure: The myth and why it's wrong.

 

I. Introduction

One of the most misunderstood concepts in exhaust theory is backpressure. People love to talk about backpressure on message boards with no real understanding of what it is and what it's consequences are. I'm sure many of you have heard or read the phrase "Engines need backpressure" when discussing exhaust upgrades. That phrase is in fact completely inaccurate and a wholly misguided notion.

 

II. Some basic exhaust theory

Your exhaust system is designed to evacuate gases from the combustion chamber quickly and efficently. Exhaust gases are not produced in a smooth stream; exhaust gases originate in pulses. A 4 cylinder motor will have 4 distinct pulses per complete engine cycle, a 6 cylinder has 6 pules and so on. The more pulses that are produced, the more continuous the exhaust flow. Backpressure can be loosely defined as the resistance to positive flow - in this case, the resistance to positive flow of the exhaust stream.

 

III. Backpressure and velocity

Some people operate under the misguided notion that wider pipes are more effective at clearing the combustion chamber than narrower pipes. It's not hard to see how this misconception is appealing - wider pipes have the capability to flow more than narrower pipes. So if they have the ability to flow more, why isn't "wider is better" a good rule of thumb for exhaust upgrading? In a word - VELOCITY. I'm sure that all of you have at one time used a garden hose w/o a spray nozzle on it. If you let the water just run unrestricted out of the house it flows at a rather slow rate. However, if you take your finger and cover part of the opening, the water will flow out at a much much faster rate.

 

The astute exhaust designer knows that you must balance flow capacity with velocity. You want the exhaust gases to exit the chamber and speed along at the highest velocity possible - you want a FAST exhaust stream. If you have two exhaust pulses of equal volume, one in a 2" pipe and one in a 3" pipe, the pulse in the 2" pipe will be traveling considerably FASTER than the pulse in the 3" pipe. While it is true that the narrower the pipe, the higher the velocity of the exiting gases, you want make sure the pipe is wide enough so that there is as little backpressure as possible while maintaining suitable exhaust gas velocity. Backpressure in it's most extreme form can lead to reversion of the exhaust stream - that is to say the exhaust flows backwards, which is not good. The trick is to have a pipe that that is as narrow as possible while having as close to zero backpressure as possible at the RPM range you want your power band to be located at. Exhaust pipe diameters are best suited to a particular RPM range. A smaller pipe diameter will produce higher exhaust velocities at a lower RPM but create unacceptably high amounts of backpressure at high rpm. Thus if your powerband is located 2-3000 RPM you'd want a narrower pipe than if your powerband is located at 8-9000RPM.

 

Many engineers try to work around the RPM specific nature of pipe diameters by using setups that are capable of creating a similar effect as a change in pipe diameter on the fly. The most advanced is Ferrari's which consists of two exhaust paths after the header - at low RPM only one path is open to maintain exhaust velocity, but as RPM climbs and exhaust volume increases, the second path is opened to curb backpressure - since there is greater exhaust volume there is no loss in flow velocity. BMW and Nissan use a simpler and less effective method - there is a single exhaust path to the muffler; the muffler has two paths; one path is closed at low RPM but both are open at high RPM.

 

IV. So how did this myth come to be?

I often wonder how the myth "Engines need backpressure" came to be. Mostly I believe it is a misunderstanding of what is going on with the exhaust stream as pipe diameters change. For instance, someone with a civic decides he's going to uprade his exhaust with a 3" diameter piping. Once it's installed the owner notices that he seems to have lost a good bit of power throughout the powerband. He makes the connections in the following manner: "My wider exhaust eliminated all backpressure but I lost power, therefore the motor must need some backpressure in order to make power." What he did not realize is that he killed off all his flow velocity by using such a ridiculously wide pipe. It would have been possible for him to achieve close to zero backpressure with a much narrower pipe - in that way he would not have lost all his flow velocity.

 

V. So why is exhaust velocity so important?

The faster an exhaust pulse moves, the better it can scavenge out all of the spent gasses during valve overlap. The guiding principles of exhaust pulse scavenging are a bit beyond the scope of this doc but the general idea is a fast moving pulse creates a low pressure area behind it. This low pressure area acts as a vacuum and draws along the air behind it. A similar example would be a vehicle traveling at a high rate of speed on a dusty road. There is a low pressure area immediately behind the moving vehicle - dust particles get sucked into this low pressure area causing it to collect on the back of the vehicle. This effect is most noticeable on vans and hatchbacks which tend to create large trailing low pressure areas - giving rise to the numerous "wash me please" messages written in the thickly collected dust on the rear door(s).

 

fantastic article.. an enlightening read..

[BlackHonda]

Coolz,...

How much does the fender eliminator cozt,..???

 

less den $200

[Tashi]

Finally, something official from Honda.

 

 

Honda launches V4 concept bike

By MCN News Desk

New bikes

07 October 2008 09:47

 

Honda has launched a V4 sports bike concept at the Cologne Motorcycle Show. Described as the bike Honda really wants to build.

 

There’s no word on technology inside the bike other than the new V4 motor but the bike has been developed to mark 30 years of the Honda V4 engine configuration.

 

Honda Europe’s Boss Mark Davies said ‘This bike shows exactly what we can do and is the sort of thing that could be reality within a couple of years.’

 

Check back for more updates throughout the day from the Cologne Motorcycle Show

[BlackHonda]

So bro Where u guys gonna be seated this sunday?

Looks like im gonna be hitching a ride on a car as well this time round

[ghost04]

dear fellow blade riders...

my 05 blade was stolen early this morning at the driveway of Hotel Equatorial KL.. CCTV footage shows the thief came, sit on the bike reverse n rode off.

does not mean our bikes come with HISS, it is safe...i still wondering how they managed to start the bike and its parked right in front of the hotel main entrance.

gone in 17 secs, fast enough??

[Yongster]

Sorry for your loss bro........

[Tashi]

So bro Where u guys gonna be seated this sunday?

Looks like im gonna be hitching a ride on a car as well this time round

 

I was in KL, but did not go to Sepang this time round.

 

Wow, it looks like HISS has a vulnerability now, get a lawyer to sue Honda for compensation. The CCTV footage is valuable proof.

 

Last time when I was in JB with an ex-blader whose bike got stolen, we heard the same thing from witnesses, but didn't think they made sense.

[ghost04]

bike wasnt started...was 'towed' away by another bike.

steering unlocked only...cctv could not zoom in on the number...

HISS cannot start cos key still wit me..

[GRassCuTTeR]

.....................

[GRassCuTTeR]

ghost04, i really feel the pain for u. hope u can recover it back soon.

 

 

this is actually the reason why i never ride my bikes anywhere unless i have 100% secured parking. (indoors only hidden from public view)

[R1Rider]

hi...just bought 07 cbr repsol 3 weeks ago....after with yamaha for long time, this is my first time on honda.....

[R1Rider]

08 owner....did u all experience the burnt oil that make ur engine oil dissapear/burnt in a riding..???

i heard this is a big problem on 08....

[BlackHonda]

dear fellow blade riders...

my 05 blade was stolen early this morning at the driveway of Hotel Equatorial KL.. CCTV footage shows the thief came, sit on the bike reverse n rode off.

does not mean our bikes come with HISS, it is safe...i still wondering how they managed to start the bike and its parked right in front of the hotel main entrance.

gone in 17 secs, fast enough??

 

sorry for yr loss bro...

hope to have it can be recovered

[BlackHonda]

another CBR 1000 rr was stolen on last sunday morning in KL

 

http://i23.photobucket.com/albums/b361/Blackhonda666/IMG_0002.jpg

[R1Rider]

looks like KL bike crime is on par with indonesia bike crime....here in indonesia hundred of bike lost in a day......but its just moped/scooter, no big bike...

sorry for u guys that lost their bike...

[d3an_cain]

another CBR 1000 rr was stolen on last sunday morning in KL

 

http://i23.photobucket.com/albums/b361/Blackhonda666/IMG_0002.jpg

 

may b its ghost04's?

[ghost04]

nope its not mine...

[ghost04]

thief had been identified...

thief is from simpang renggam

[ghost04]

pass the msg ard....

[RoslanSp]

Dear bladers,

 

While i'm ridding my 08 to my workplace, i was hit by a forklift.

Lucky never buang or the forklift blade hit my leg.

[d3an_cain]

r u ok ?

i wonder how the forklift hit u?

[RoslanSp]

r u ok ?

i wonder how the forklift hit u?

 

Lucky i'm ok.

i was ridding towards my work place when i saw a forklift ahead of me moving towards the same direction. I was about to reach beside the forklift (about 2 metres gap), the forklift driver without checking blindspot n safety check, just make a sudden left turn. i could feel the forklift blade hit my machine and i started to wobble.

[BlackHonda]

How bout the repairs? u claim the F**klift guy?

lucky not yr leg get the hole bro