Balance Factor ??

[belongtomes3]

Hi everyone!
Please tell me a good balance factor for 1 cylinder engine without balance shaft. I read somewhere that the balance factor of vertical engine (piston moves along vertical axis) is different from balance factor of horizontal engine.

I have tried a balance factor 71% for my 1 cylinder horizontal engine and it runs worse than the stock crankshaft.

Please give me some advises.

I have an ideal that:
I measure the balance factor of the stock engine with stock crankshaft and stock piston, then when I use bigger piston I will modify the crankshaft to keep the same balance factor. Is it a possible, had anybody does this and have a good result ?

sorry, my English is not good ^^.

 

[rich1]

In reality a single cylinder engine cannot ever be perfectly balanced . Google it and see why.

 

[belongtomes3]

In reality a single cylinder engine cannot ever be perfectly balanced . Google it and see why.

thank you sir, I read about it but I wonder what balance factor give the smoothest feeling riding????

 

[best]

There is much more to this question.
When the Blaster motor is mounted in a DT200 motorbike and used with a head stay, it can be used without a balancer. This is because the head stay dampens the vibrations of the engine case and the leverage they have on the front and back engine mounts. Like tuned exhaust pipes, the theoretical calculations will get you into the range, final determination is made through experimentation.

If you are worried about using a heavier piston and its effect on balance, don't.
A minor increase in piston weight is generally insignificant in a single cylinder engine.

Short answer, experiment. Move the weight timing around until you feel the least vibration at your most used rpm. Increasing the balancer weight to compensate for the piston increase is probably not going to be worthwhile. A head stay may help to reduce perceived vibration. Cushioned motor mounts are generally ineffective in light weight single cylinder engines. I can talk deeper about the reasons for all of this but I have probably bored everyone already...

Good luck

Steve

 

[BlasterFun484]

This sounds like a disaster waiting to happen. Engine parts flying all over the place!

 

[OConnor Racing]

I'm not bored Steve. But I'll be boring most of the day. Get it?