Woopa!! Cbr1000rr Riders

[Ken]

Maybe i should put might get even better milleage rather than will.

 

My personal opinions, might not be true. Here it goes...

By adding an air filter, there will be more air flow which should result in more fuel output, but there's a limitation to how much the ECU can adjust the fuel output.

Therefore we need a PC3 to ''ask'' for more fuel output.

So when the air filter is added without the PC3, the a/f ratio will be more air and lesser fuel thus making the mixture lean.

I dun noe why by adding a pipe will make a bike run lean, maybe the pipe will change the a/f ratio. And it seems that by adding a pipe without PC is making the bike having better milleage cos it make the bike runs lean, so i presume that adding an air filter without PC will further leaning the bike and might improve the millieage more?

But it may also be too lean that it will damage the bike.

 

While going at high speed, the air input will be even more, but the amount of fuel is still at that level. So when going at high speed, it is bad for the engine as fuel is not enough.

Now that my bike is running lean, i found that it is not as smooth as it is when my bike is running rich.

 

But tashi, Block off plate is a must do ''mod''.

Trust me, u will like it very much and dun think it will reduce ur milleage.

I think that as long u dun add a PC, ur milleage should be still the same.

[henRRy]

TASHA AND GUYS, guess what u guys miss...

http://img206.exs.cx/my.php?loc=img206&image=pic00124vr.jpg

http://img206.exs.cx/my.php?loc=img206&image=pic00113jq.jpg

http://img206.exs.cx/my.php?loc=img206&image=pic00101av.jpg

 

$18,000 Ginsheng!

http://img206.exs.cx/my.php?loc=img206&image=pic00132ar.jpg

 

blackbird for 68k

http://img206.exs.cx/my.php?loc=img206&image=pic00152tn.jpg

 

Pardon me for my 2mp digi camera..

[Raptor]

Originally posted by Ken@Feb 3 2005, 06:31 PM

Maybe i should put might get even better milleage rather than will.

 

My personal opinions, might not be true. Here it goes...

By adding an air filter, there will be more air flow which should result in more fuel output, but there's a limitation to how much the ECU can adjust the fuel output.

Therefore we need a PC3 to ''ask'' for more fuel output.

So when the air filter is added without the PC3, the a/f ratio will be more air and lesser fuel thus making the mixture lean.

I dun noe why by adding a pipe will make a bike run lean, maybe the pipe will change the a/f ratio. And it seems that by adding a pipe without PC is making the bike having better milleage cos it make the bike runs lean, so i presume that adding an air filter without PC will further leaning the bike and might improve the millieage more?

But it may also be too lean that it will damage the bike.

 

While going at high speed, the air input will be even more, but the amount of fuel is still at that level. So when going at high speed, it is bad for the engine as fuel is not enough.

Now that my bike is running lean, i found that it is not as smooth as it is when my bike is running rich.

 

But tashi, Block off plate is a must do ''mod''.

Trust me, u will like it very much and dun think it will reduce ur milleage.

I think that as long u dun add a PC, ur milleage should be still the same.

If I remember correctly, someone correct me if I am wrong, the fuel to air mixture should be 1:15 ideally.

 

By putting on the Yoshi, which has been developed for the bike, the flow of exhaust gases out of the pipe has been enhanced, less restrictive unlike the OEM's.

A less restrictive pipe will mean better pickup and midrange power, but lack of back pressure causes the engine to lose out on the top end but these pipe companies have come up with the best configuration to get the best out of the pick up and midrange but still have enough back pressure available not to lose out on the top end. Because they have devoted more efforts into their research and development... most exhaust system companies tend to produce better pipes than the OEMs.

 

Those 2 strokers riders who cut the baffle on their exhaust have better pickup but shitty top end, it flattens off abruptly. That is why the newer bikes have the exhaust valves, which allows for free unrestricted flow in the low rpms but start to close and restrict when the rpm goes higher. Best of both worlds.

 

Four stroke engines are basically constant volume engines unlike jet engines which are constant pressure engines. The volumetric efficiency of the the 4 stroke engine is dependant upon the timing of the inlet and exhaust valves and the head pressure that is available in the air box, hence the ram air intake system and tubes. There is a period during the exhaust stroke, when the inlet and exhaust valves are both opened, to effect cross scavenging, ie to use the impetus of the exiting spent exhaust gases to literally 'suck' in the fresh mixture. The exhaust valves are normally closed a split second earlier than the inlet valves to allow the inrushing fresh charge to build up a back pressure which directly increases the volumetric efficiency of the engine. Two strokers suck at this game of volumetric efficiency due to the lack of valves and alot of their fresh charge of fuel / air mixture is lost through the exhaust port.. hence their poor consumption and low compression capability.

 

Changing to a less restrictive exhaust on a 4 stroker actually enhances this 'sucking' effect, hence the power increase.

 

But the moment one puts on a less restrictive air filter... the whole ball game changes. More air is allowed in... whilst fuel input by the injectors is still the same... the result is a leaner mixture. Hence the need for a PC to reprogramme the fuel mapping to enrich the mixture. All petrol driven engines have a rich best power and lean best power. For piston engined aircraft, like Cessnas, they are manually trimmed to rich best power for take off and to keep cylinder head temps down but once they are cruising they are trimmed to lean best power to conserve fuel and cater for the less dense air at altitude. If you have noticed before, petrol driven engines tend to suddenly increase in rpm before calling it quits when the fuel supply runs out. That is an example of lean best power... and increase in power without an increase in fuel input.

 

Sounds like a whole mouthful. Am I making sense to you??

 

With regards to the Yoshi I have on... the bike is running more efficiently. I know I am not running leaner coz there is grayish black soot on the exhaust. If the exhaust deposits were white or very light gray... I am running too lean.

 

Running too lean will result in higher than normal operating temps and alot of after firing (explosions in the exhaust) accompanied by rough running and pinging due to preignition of the fuel mixture by the hot spots created (glowing carbon deposits in the combustion chamber and piston head) even when cruising at a fixed throttle setting.

 

I get 'pops' coming from the exhaust when I snap the throttle open and close due to sudden increase in airflow when the rpm is increased but the sudden cut off of fuel due to the sudden closing of the throttle results in an overlean condition setting off the 'popping' of the exhaust. Tashi noticed that when he started my bike the first time to hear the exhaust at KKFC, I think that hooked him.

 

I also get 'popping' when I downshift from high speeds with the throttle close after a while.

 

But the best part is... when I pick up to redline and do quick gear changes.. there is 'pop' from the exhaust everytime I change gear... just like the MotoGP bikes sound like when they go down the main straight of Sepang.

 

Other than the titanium street legal Yoshi end can and the Plot steel braided brake hoses...everything else on the bike is stock.

[Tashi]

Originally posted by henRRy@Feb 3 2005, 08:02 PM

TASHA AND GUYS, guess what u guys miss...

http://img206.exs.cx/my.php?loc=img206?=pic00124vr.jpg

http://img206.exs.cx/my.php?loc=img206?=pic00113jq.jpg

http://img206.exs.cx/my.php?loc=img206?=pic00101av.jpg

 

$18,000 Ginsheng!

http://img206.exs.cx/my.php?loc=img206?=pic00132ar.jpg

 

blackbird for 68k

http://img206.exs.cx/my.php?loc=img206?=pic00152tn.jpg

 

Pardon me for my 2mp digi camera..

Tasha right, later kena pull ear again. I was wondering why your gf called me Tasha.

 

Coming from you, I'm wondering if those are real chics or not, hehe.

[Tashi]

Is that popping bad? I notice these occur a lot in race tuned machines. Even when playing Ridge Racer on my PSP, when I rev the engine and release, there is no popping, but when I rev it to red line and release, it pops & spits fire in the exhaust as well.

 

Such realism in a game. Let me hook up my PSP to my speaker and record the sound.

[Tashi]

Got it, d/l file, rename to .mpg.

 

Better go shower now, later kena super tarik talinger.

[Tashi]

Suzuki K5 will be unveiled @ Taka on 26 & 27 this month btw.

[Raptor]

Originally posted by Tashi@Feb 3 2005, 11:41 PM

Is that popping bad? I notice these occur a lot in race tuned machines. Even when playing Ridge Racer on my PSP, when I rev the engine and release, there is no popping, but when I rev it to red line and release, it pops & spits fire in the exhaust as well.

 

Such realism in a game. Let me hook up my PSP to my speaker and record the sound.

Let me go do some research on this.

As long as the popping in the exhaust is not an explosion like a gun shot, which you can hear from some vehicles, I am not worried.

 

Lean mixtures are slower (milliseconds) to burn when ignited by the spark plug.. so I think the pop sound comes when the last traces of unburnt mixture is still igniting whilst in the process of exiting the exhaust valve during the exhaust stroke hence the mini explosion heard in the exhaust.

 

A correct fuel/air mixture would be completely ignited and burnt during the downward power stroke. The following upward exhaust stroke would be expelling the totally burnt mixture (exhaust gases) through the exhaust valves.

 

Ahhhh the four stroke cycle... Induction, Compression, Power and Exhaust.

 

I just like to remember the cycle as Suck, Squeeze, Bang and Blow.

[3ddy]

Ride: Iranian Dinner @ Perling

Date: Saturday 5 Feb 2005

Time: Evening 8 pm?

Meeting: GP Esso

 

Participants

1. Raptor

2. Tashi

3. Chilly

4. Ideal

 

 

sorry guys. las min...going for a spin to KL

[Tashi]

Originally posted by lEddyl@Feb 4 2005, 07:25 AM

sorry guys. las min...going for a spin to KL

Hey, always "let aeroplane go."

 

Say hi for me if you see a 63 yr old Blader. Enjoy your trip.

[Tashi]

Originally posted by Raptor@Feb 4 2005, 06:42 AM

Let me go do some research on this.

As long as the popping in the exhaust is not an explosion like a gun shot, which you can hear from some vehicles, I am not worried.

 

Lean mixtures are slower (milliseconds) to burn when ignited by the spark plug.. so I think the pop sound comes when the last traces of unburnt mixture is still igniting whilst in the process of exiting the exhaust valve during the exhaust stroke hence the mini explosion heard in the exhaust.

 

A correct fuel/air mixture would be completely ignited and burnt during the downward power stroke. The following upward exhaust stroke would be expelling the totally burnt mixture (exhaust gases) through the exhaust valves.

 

Ahhhh the four stroke cycle... Induction, Compression, Power and Exhaust.

 

I just like to remember the cycle as Suck, Squeeze, Bang and Blow.

Exhaust Systems

by Jim Kerr

 

Exhaust systems are usually forgotten about until a major problem occurs. Fortunately, the systems tend to very durable considering the conditions they operate under. A good exhaust system not only carries harmful exhaust gases away from the passenger compartment, but also converts most of the harmful gases into acceptable by-products. A simple understanding of exhaust system operation can help a driver recognize many problems before they require more expensive repair.

 

The exhaust system starts with the exhaust manifold on the engine. Hot exhaust gases flow from the manifold through the front or header pipe into a catalytic converter. The converter changes unburned hydrocarbons (fuel) and carbon monoxide into water vapour and less harmful carbon dioxide.

 

Inside the stainless steel case of the converter, there is a ceramic honeycomb coated with a thin layer of platinum. When the exhaust gases pass through the hot converter, they are changed. Many performance cars use dual converters and dual exhaust systems to allow more exhaust gases out of the engine.

 

From the converter, the exhaust flows through another pipe to the muffler. On most cars, the exhaust now flows out the tail pipe, but on some models, the exhaust passes through a secondary muffler called a resonator. Finally, clamps and rubber mounts called hangers support the exhaust system under the vehicle.

 

Inspecting the exhaust system is simple. The first step is to put on some work clothes because reaching under the car is a dirty business. The second step is to apply the parking brake and block the wheels so the car will not roll over you! Most exhaust parts are visible once you lay down beside the car. Inspect all the hangers to see if the exhaust system is properly supported. A broken hanger causes the exhaust pipes to flex and break.

 

Next, inspect the muffler and resonator. Poke the parts with a screwdriver to see if they are solid. Small rust holes usually start to form at the bottom and ends of the mufflers close to where the exhaust pipes enter. Many mufflers have a small hole at the lowest end to drain any water out of the muffler. The water is a by-product of the combustion process and is normal, but it is also the reason the exhaust system rusts from the inside first.

 

Any exhaust parts with rust holes in them should be replaced. Odourless and poisonous carbon monoxide gas can leak from the rust holes into the passenger compartment. Tap on the muffler a, resonator, and converter gently with a rubber hammer or block of wood. Any rattles heard from inside these parts indicate an internal failure hat could lower vehicle performance by blocking the exhaust flow.

 

The last parts to check are the exhaust pipes. Any pipes that bend easily when squeezed with a large pair of pliers require replacement. Many newer cars have exhaust pipes made of stainless steel. Although more expensive then regular steel pipes, the stainless pipes last much longer.

 

Noise and smell are other indications of exhaust system problems. A hole in the exhaust system not only makes the car sound louder, but can also cause the oxygen sensor in the fuel injection system to falsely sense a lean fuel mixture. The computer then injects extra fuel into the engine to compensate and your fuel economy drops. Sometimes the extra fuel passes through the engine into the exhaust system and combines with the oxygen let in by the exhaust leak to cause a loud backfire. This can quickly destroy a good muffler!

 

Some vehicle exhaust gases smell a little like rotten eggs. This is caused by the catalytic converter as it changes the exhaust gases. Sulphur in the fuel combines with oxygen to create the smell. Unfortunately, the odour is the small price we have to pay for cleaner exhaust, but if the smell is strong, the vehicle should be checked. An engine that is using too much fuel or is running rough causes the converter to work extra hard as it tries to convert the unburned fuel into other gases. The converter gets extremely hot under these conditions; exceeding 650 degrees C. and this soon causes converter failure. Drive the vehicle slowly and as little as possible until the rough running is repaired.

 

Finally, here is a tip for diagnosing a plugged exhaust system. Connect a vacuum gauge to an intake manifold vacuum port. Run the engine at 1000 rpm with the transmission in park and check the vacuum reading. Then increase the engine speed to 2500 rpm. Again, check the vacuum reading. If the reading drops at higher rpm, then the exhaust system may be plugged.

 

 

 

 

Jim Kerr is a master automotive mechanic and teaches automotive technology. He has been writing automotive articles for fifteen years for newspapers and magazines in Canada and the United States, and is a member of the Automotive Journalist's Association of Canada (AJAC).

[Tashi]

Ride: Iranian Dinner @ Perling

Date: Saturday 5 Feb 2005

Time: Evening 8 pm?

Meeting: GP Esso

 

Participants

1. Raptor

2. Tashi

3. Chilly

4. Ideal

 

 

Guys, need a favour. There're 2 young tian mimi office ladies who wants to go tomorrow as well. They have their own helmets. Anyone here can pillion them?

 

I know we're all fuel conscious, but they're light weight, the Fitch should be more than able to counteract.

 

Raptor, your VVIP going tomorrow?

[3ddy]

Originally posted by Tashi@Feb 4 2005, 09:31 AM

Hey, always "let aeroplane go."

 

Say hi for me if you see a 63 yr old Blader. Enjoy your trip.

hahaha. trip cancelled. coz many scare of the jam this weekend.

 

can i transit back on?

[Tashi]

Ride: Iranian Dinner @ Perling

Date: Saturday 5 Feb 2005

Time: Evening 8 pm?

Meeting: GP Esso

 

Participants

1. Raptor + 1 SYT

2. Tashi

3. Chilly

4. Ideal

 

 

Guys, need a favour. There're 2 young tian mimi office ladies who wants to go tomorrow as well. They have their own helmets. Anyone here can pillion them?

 

I know we're all fuel conscious, but they're light weight, the Fitch should be more than able to counteract.

 

Update: 1 more SYT (Sweet Young Thing) left to pillion.

[Tashi]

Originally posted by lEddyl@Feb 4 2005, 07:12 PM

hahaha. trip cancelled. coz many scare of the jam this weekend.

 

can i transit back on?

Eddy, welcome back! Pls add your name and let me know whether you can pillion 1 SYT or not. Make sure you don't be a pilot again.

[3ddy]

Ride: Iranian Dinner @ Perling

Date: Saturday 5 Feb 2005

Time: Evening 8 pm?

Meeting: GP Esso

 

Participants

1. Raptor + 1 SYT

2. Tashi

3. Chilly

4. Ideal

5. Eddy

 

 

 

Tashi: where ur SYT stay ah? i'm near town.

[Raptor]

Originally posted by lEddyl@Feb 4 2005, 08:58 PM

Ride: Iranian Dinner @ Perling

Date: Saturday 5 Feb 2005

Time: Evening 8 pm?

Meeting: GP Esso

 

Participants

1. Raptor + 1 SYT

2. Tashi

3. Chilly

4. Ideal

5. Eddy

 

 

 

Tashi: where ur SYT stay ah? i'm near town.

If it is a sweet young thang.... she could stay in Batam and I would ride my bike there to pick her up. Whahahahahhahha!!!

[Raptor]

Originally posted by Tashi@Feb 4 2005, 07:20 PM

Eddy, welcome back! Pls add your name and let me know whether you can pillion 1 SYT or not. Make sure you don't be a pilot again.

Yeah... welcome back Eddy. Would be a pleasure to meet you tomorrow.

 

And talking about tomorrow... can we all meet at the GP Esso by 7.30pm??

We should be in Perling by 8.00pm latest.

 

If there are no objections... by tomorrow 3 pm.. it will be 7.30pm.

[Raptor]

Originally posted by Tashi@Feb 4 2005, 09:42 AM

Exhaust Systems

by Jim Kerr

 

A hole in the exhaust system not only makes the car sound louder, but can also cause the oxygen sensor in the fuel injection system to falsely sense a lean fuel mixture. The computer then injects extra fuel into the engine to compensate and your fuel economy drops. Sometimes the extra fuel passes through the engine into the exhaust system and combines with the oxygen let in by the exhaust leak to cause a loud backfire. This can quickly destroy a good muffler!

 

The cars mentioned are USA market cars.

 

American cars have oxygen sensors and there extra pipings leading into the exhaust manifolds to introduce fresh air intot the headers to help ignite unburnt mixtures. These all done as part of their requirements of the Clean Air Act.

 

When I was assigned to the USA, I owned an American car... a Ford Thunderbird to exact, and that was when I found out about this oxygen sensor thingy and the rotten eggs smell from car exhausts.

 

Because of this stringent requirements set by the EPA, bikes meant for the USA market tend to be detuned and shortchanged on horsepower and are running leaner, and therefore use colder spark plugs.

[Ken]

Dearest Tashi, my gf saw ur sms especially the meaning of SYT.

Got to thank you once again.

You are really my good friend.

[Raptor]

Ken,

 

What this block off plate you talking about??

 

What is its purpose and function??

 

What is the effect of removing it??

[Raptor]

F22 aka Raptor.

Stealth technology at its best.

I could kiss the ground this jet rolls on.

 

Just like the CBR1000RR.... it looks beautiful when seen at an angle of 45 degrees from the rear.

 

Check out the rectangular fully variable exhausts nozzles.

 

Unlike the exhaust control valves, which are actually gate valves, on our bikes... this engine just varies the size of the exhaust openings according to the settings of the the throttle and engine rpm.

 

When is the day this kind technology gets transferred to the bikes???

[Tashi]

Originally posted by lEddyl@Feb 4 2005, 08:58 PM

Tashi: where ur SYT stay ah? i'm near town.

2 original SYT not going, another 1 coming.

[Tashi]

Originally posted by Ken@Feb 5 2005, 03:47 AM

Dearest Tashi, my gf saw ur sms especially the meaning of SYT.

Got to thank you once again.

You are really my good friend.

I'm crying a river for you.

 

SYT could be durians.

[3ddy]

Originally posted by Tashi@Feb 5 2005, 09:52 AM

2 original SYT not going, another 1 coming.

ok. see u all at 1930hrs