DIRT BIKE SUSPENSION REBUILD – DYNO SHOCK!

Hi guys!

Following a very popular question of past weeks of you all, I’ve decided to talk about my dyno shock, how it works and what it can tell to us when I’m testing a new product or when I’m doing a dirt bike suspension rebuild.

Well, for start is important to know the two types of dyno shock, which are:

  • Rotation Dyno Shock
  • Linear Dyno Shock

ROTATIONAL DYNO SHOCK

As the name says, it has a rotating motor with a fixed stroke and variable speed. It has the “Scotch Yoke” that is a reciprocating motion mechanism, converting the rotation in to a slider motion . It is a simple dyno shock but very good to have in the workshop to test when you are rebuilding a dirt bike suspension. You can see how it works on the image below.

LINEAR DYNO SHOCK

Linear dyno shock has a linear motor, which is an electric motor that has had stator and motor unrolled, that produces a linear force along its length. It levitates on magnets and it can accelerate an object to a very high speed. It has a wide range of speeds, positions and higher acceleration. The consumption is very high and it can exceed the 40A.

And this is the dyno shock that I’ve chosen to test my products and to do dirt bike suspension rebuild. It is perfect and high-performance to test new products and as I’ve already said, also when I rebuild a dirt bike suspension.

Step Lab Engineering, an Italian company which is specialized in the production of high customizable test benches, did my dyno shock, clearly customized according to my special needs.

It has a stroke of 380mm, when usually the standard ones have a stroke of 200mm.

The data acquisition on a classic dyno is 1 kHz, that is 1000 dots per second, on mine is 4kHz so 4000 dots per second and it has 60G of acceleration. Thanks to this I can obtain a big number of data, that can allow me to understand many things about my products’ performances.

WHY IS SO IMPORTANT TEST ON DYNO SHOCK WITH NEW PRODUCT OR WHEN YOU ARE DOING A DIRT BIKE SUSPENSION REBUILD?

It is important to know that tests on dyno shock don’t tell me if a shock absorber is ok or not, but with the graphics I can see if there is cavitation or other problems and I can do a valving analysis.

Regularly I spend whole days to do tests on it before and after have done tests on track with a rider and is very interesting to see the comparison and if what I’ve seen on the dyno is exactly what happens on bike during a ride

On the video below you can see how my dyno shock works and what type of graphic I obtain.

To test the front fork or to rebuild it, I push it at various speeds and the dyno shock simulate the asperities of the ground and the result is what you see on the graphic.

MY FIRST HOMEMADE DYNO SHOCK TO TEST PRODUCTS TO UPGRADE DIRT BIKE SUSPENSION

Before buying my actual dyno shock, which is with me since last year, I had a test bench completely designed and done by myself and you can see it on the pictures. If you are thinking that it looks terrible, I say yes, but I can assure you that it was a faithful ally and it did a commendable job! Funny thing.. I remember when I was going in France with my wife and we had an old turboprop, my wife was scared and the flight assistant told us “It’s ugly but it work very well!” 😂 

I did it in 2008 at the beginning of my way, so yes I’m attached to it and I preserve it like a memory.

But now I’m happy and proud to have my new test bench, that is one of the most important machineries in my workshop! 

I hope that my theme of today was interesting and for your curiosities or questions, I’m here to answer !

Thank you for your time and….. happy weekend!!!! Here in Italy we have a long weekend due to a bank holiday next Monday and it will be a good opportunity for riders, that will have an extra day to ride!

See you next time!

-Gianni-

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