Hi, 

What sensor would you use? All channels include a filter and very fast signal changes will not be possible to see.

A sensor that measures average vibration would be ok to measure, ie vibration level is given by 0 to 5 v. 

Plenty piezoelectric sensors out there to use. 

Google "piezo sensors shield for ardunio" there are many to choose from.

What is the purpose your intending to use the information for ? Sorry for the silly question.

Some diesel engines have them fitted and know their purpose on a diesel engine.

The engine is a 200cc single cylinder engine commonly used on racing g0 karts.

They have many classes and rules and the engine rpm can be limited to 6400 in one class up to unlimited classes seeing 10,000+ rpms.

The engines originally were designed to run at 3600 rpm and do not have counter balance shafts.

You can only balance a single cylinder engine to run smooth in a limited rpm range and it would be beneficial to be able to find that balance factor and rpm range on the dyno.

There is not a 'standard' balance factor on these engines and you will read anywhere from 50% tp 70% used which is a huge variance.

So to answer the question, logging vibration would allow the crankshaft to be balanced to match the engine rpm.

Jeff

OK , thanks for that reply , definitely would be hard on the kidneys. 

Even tho you only have one auxiliary input left on yourdyno , nothing stopping you using a arduino mega and log more information.

be nice to see it in operation have fun.

Cheers

Hello to all,

I want to try this, follow this link

https://www.murata.com/support/library/video/productvideo/sensorvideo13

Derk

Just use as many $2-95  Piezo Vibration Horizontal_100 Sensor shields and a Arduino ATmega2560 and have plenty of 1/0's in reserve for other engine parameter logging.

https://www.sparkfun.com/products/9198 - Piezo Vibration Sensor - Small Horizontal

One can even use a very small speak ( Piezo ), or even two wires anything is possible.

One still has to statically balance a crankshaft/conrods/piston assembly  before one starts dyno testing anyway to desired RPM.

On the engine dyno he will just confirm his dynamically balancing the engine to his set desired RPM.

Will be interesting to see it Revving on the dyno?

Here is what I went with.....

https://computech.com/product/single-axis-accelerometer/

It required a 12vdc power supply and hooked straight up to the 0-5v analog input.

Seems to do what I was wanting and can overlay with rpm on a graph.

Jeff