Pistons for m20 Stroker

[.n0iz4!]

Yea this looks pretty accurate. Would you share your work with me? When you dont want to, no problem.

My last two problems are that i have to measure the Radius of the "Piston Ball - the convex shape" and the position and Radius of the Concave/Dome Ball.

I think its x+8 and y-8 but this is too unaccurate for me. Also the Radius at the 9,7 - somthing from 200mm-210mm(Diameter) could be correct but... for me its tooo unaccurate :?

Some idea is to clamp the piston on the CNC and take a dial indicator and "drive" above the piston. Write down the Points and get the Radius :D

[digger]

for the 9.7:1 +0.5mm piston it is, R100 convex (dome) and R107 concave (dish)

[.n0iz4!]

for the 9.7:1 +0.5mm piston it is, R100 convex (dome) and R107 concave (dish)

Thanks alot!

I'll check this on thuesday/friday at the cnc.

It is correct that the Offset is x8 y-8 ?

[digger]

I had It closer to 7mm but hard to measure. Small variation Doesn't matter much though

[.n0iz4!]

Didnt had the time for the Piston "measure".

I'm too busy buildin my own Rocker arms, sorry.

Will get back to the pistons soon!

[E30-325iS]

Didnt had the time for the Piston "measure".

I'm too busy buildin my own Rocker arms, sorry.

Will get back to the pistons soon!

So start a new thread and show us your work on the rocker arms.

[.n0iz4!]

So start a new thread and show us your work on the rocker arms.

I already started a new thread in our german e30-talk Forum :D

https://e30-talk.com/topic/202157-kevin-allein-zu-haus-baut-nen-motor/

There you can watch it. But its not finished yet. The Problem ist the strength / how much Newtons go into the rocker-arm etc.

But i'm on the way... maybe :D

[.n0iz4!]

Ok, back to the Pistons.
Offset Wiseco should be X+5.9 Y-6.05 (~6)

Merry Christmas :D