Question about my squish measurements

[TAftonomos]

Putting a testa motor back together, I used solder to check the squish. Stock base gaskets, stock headgasket.

OE pistons, OE base gaskets, OE HG.

My front and back clearance was 1.02-1.05mm, but the side piston crown to head clearance was 1.5mm (or more?)  These are flat-top pistons btw...

1.00 mm is what I'm shooting for, but I was told by several people that nearly all of the testas need a .02mm thinner base gasket....wondering why mine seems spot on.

Also, if I did this correctly, why is the side clearance on the piston to head is more than the front/back. (piston rock? Or is the piston not really flat?)

[ducpainter]

Your piston pins would have to be very loose to account for that much side rock I'd think.

I'm thinking something isn't machined just right

[TAftonomos]

I was figuring the piston rock fore/aft would close up the squish there, where as the side to side play is non-existant.  I guess it's OK, I didn't change/machine anything.  Just weird that it's spot on and not all over the place like the dozen or so 900SS's I've checked.

Here is where I placed the solder.  Front/back or top/bottom is where the measurement was recorded.  The "side" measurement didn't come up with anything (at least 1.5mm)



Maybe it just wasn't close enough to the outside edge.  I'd assume the only rocking motion would be fore/aft, so as long as those are OK, and I didn't change/machine anything, I'm good to go.

[ducpainter]

I think you're good to go.