FCR-Balance pipe effect

CBX-FCR-Negative pressure outlet nipple FCR
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FCR-Balance pipe effect

This is going to be a bit of a rough article. I've wanted to check the operation with and without a balance pipe for a while, so
I will post about it.
I will write the results first.
[No change]
The verification method is also sloppy, and it is not clear whether the thickness of the balance pipe is the correct size or not. At least, even if you install a balance pipe on the CBX with the outer diameter of the negative pressure outlet nipple, the effect will be low or you won't be able to feel it. The inner diameter of the balance pipe is the outer diameter of the negative pressure outlet nipple.
On the other hand, I didn't notice any symptoms that seemed inconvenient.
My current conclusion is that a balance pipe is useful in terms of improving work efficiency.

Past reference articles
FCR-6-synchronization-balanced pipe

FCR-6-synchronization-balanced pipe
There are three ignition coils in the CBX. Why are there three cylinders even though it has six cylinders? Nos. 1 and 6 are fired at the same time. Light 2 and 5 at the same time. This is because No. 3 and No. 4 are lit at the same time.If you write what you want to write early, the balance pipe connections are number 1 and number 6. No. 2 and No. 5. Connect No. 3 and No. 4. The engine firing order is 1-5-3-6-2-4.

Method of verification

Before re-synchronizing, check if there are any changes between the balance pipe specification and the blank cap specification.
The premise is that if there is a change in idling or racing before and after the synchronization is slightly out of sync,
It can be determined that there are changes, both good and bad. The current method of installing balance pipes assumes that they are functioning correctly even if they have not been installed correctly.
*It is possible that the pipe is too thin and has become synonymous with a blind cap.
The fact that there is no change also means that there is no problem with driving.
Some people who are equipped with nipples on their FCR may be a little concerned.
The inner diameter of the balance pipe is the outer diameter of the negative pressure outlet nipple.
The connections are No. 1 and No. 6, No. 2 and No. 5, and No. 3 and No. 4.
This will be the same as the destination of the plug cord.

I uploaded the video to YouTube.

A video will be played after the last synchronization. It may be helpful, but
It may not be worth it if you know the outcome.
・Balance pipe arrangement
・Balance pipe and ram air
・Balance pipe and funnel
・No balance pipe. Mekura cap. Funnel specifications
・Immediately after synchronization
It becomes.
HONDA CBX-FCR-Balance pipe

work photos

Either a balance pipe or a blank cap would be fine for the negative pressure outlet nipple.
What can be said with certainty is that if the opening of the negative pressure outlet nipple is in direct contact with the outside air,
The engine will stall. It will be in a state where it is sucking a lot of secondary air.
The fact that the engine stalls means that there is a problem with sucking secondary air, and the negative pressure extraction nipple is probably working correctly.

FCR-Balance pipe effect【summary】

This type of verification is extremely important and will definitely help someone in some way.
However, there was no change in a negative sense, so I will leave the current situation as good.
The verification method and installation method are complicated, so if you install the balance pipe with a more accurate method,
There may be other results. However, there may be no results.
If you think about it carefully, if the tuning is such that a balance pipe is effective, it seems like the balance pipe specification will be used at the time of shipment from the manufacturer.
I feel like the balance pipe is not effective.
Speaking of the CB750F, negative pressure can be extracted from the inside of the head, but basically a blind bolt is attached. If it is effective or causes no problems, the manufacturer should have adopted it as standard. However, I think that if it is not adopted as a standard, either there is a high chance of trouble occurring, or there is no point at all.
It may be difficult to understand the effect on a 6-cylinder engine. It may be that the effect is easier to understand with 2 cylinders. At least using a balance pipe instead of the negative pressure outlet nipple cap has not caused any trouble to date. In fact, it is useful because it is easier to put on and take off than a plug-type cap. I think there is little to be gained from further research on balance pipes. I'll at least keep it in the back of my mind, but I don't think I'll try anything else in the future.
I'll try it when I have a chance.
I hope you have a good FCR life!
See you again!
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