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Engine development

The piston

As we told you last time we have some improvements planned for next season to the CDI engine. Jesse will make a post with more technical details later but here’s a teaser about what we have planned.

Jesse dissembling the om648
Jesse dissembling the om648

The first upgrade Jesse wanted to do was modifying the fuel line. He and our programmer suspected that the original flow-back design causes the fuel pressure to drop to much on lift, or too much for our use. This may cause some of the lag and unresponsiveness we experienced this season on the track. To fix this we’ll modify the fuel rail and exchange the electronic pressure valve with a mechanical one.

The engine in pieces.
The engine in pieces.
All parts sorted and checked.
All parts sorted and checked.

When we took apart the engine we noticed some small cracks in the pistons and very light signs of melting. As we would still like to have more power from the engine this is slightly worrying. To fix this we’ll try to ease the stress on the pistons by lowering the compression rate. As we’ll also make a new version of our injectors we’ll also need to modify the pistons to work with the new injectors.

The piston
The piston
Jesse making prototype pistons.
Jesse making prototype pistons.
The new shape was designed by Jesse, our programmer and the injector maker.
The new shape was designed by Jesse, our programmer and the injector maker.
We'll test the new piston asap.
We’ll test the new piston asap.
Comparison between the new and the old piston.
Comparison between the new and the old piston.

The block, crank shaft and piston rods was sent to Ville at Kokkolan moottorihiomo. Ville will check the parts and fit new bearings.

Block at Kokkolan moottorihiomo.
Block at Kokkolan moottorihiomo.
Parts to be checked.
Parts to be checked.

I’m sure I’ve forgot something but hopefully Jesse will add more detail on the improvements. Jesse will also show you some very interesting engine simulations based on the new setup 😀
To be continued…

And check out our christmas sale on our shop if you haven’t already.

11 thoughts on “Engine development

  1. James Shiach James Jonus Worbey smoke

    1. Just knocking up a set of Pistons

    2. Lol CDI over square plz

    3. Excessive torque for the win

    4. Compression lower than atmospheric

    5. What boost you running.
      Oh -14.7psi

    6. Engine turns backwards giving 6 reverse gears and 1 forward

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