19 replies to this topic

[Lplus]

Here's the head now. I'm wondering whether it's best practice to chamfer the waterway holes to take the sharpness off them. I did run a small file around the chambers to take the sharp edge of them. 

 

 

20250110_100827.jpg

No, just leave them alone.

[Shooter63]

I've been doing a bit of rooting about regarding you piston dish, are you sure you have 8.3cc? This seems high, and I can't find that listed anywhere, compression ratio yes, but not piston dish?

Shooter

[babsbrown]

I've been doing a bit of rooting about regarding you piston dish, are you sure you have 8.3cc? This seems high, and I can't find that listed anywhere, compression ratio yes, but not piston dish?

Shooter

Hi shooter, well I wrote that down from using syringes to cc them. So I could have quite easily have over calculated. I did notice the higher 1098 compression pistons had 7cc dishes. I'm hoping they're closer to those really.

Bit of a shame as theyre in the block now so I would be able to accurately measure them.

Cheers again,

[Turbo Phil]

Here's the head now. I'm wondering whether it's best practice to chamfer the waterway holes to take the sharpness off them. I did run a small file around the chambers to take the sharp edge of them. 
 
 
20250110_100827.jpg

Yes definitely worth running a file around all the chambers & holes after it’s been skimmed. Removing the sharp edge will reduce the chances of a crack starting.


Phil.

[babsbrown]

Here's the head now. I'm wondering whether it's best practice to chamfer the waterway holes to take the sharpness off them. I did run a small file around the chambers to take the sharp edge of them.


20250110_100827.jpg

Yes definitely worth running a file around all the chambers & holes after it’s been skimmed. Removing the sharp edge will reduce the chances of a crack starting.

Thanks mate, would you glance the holes with a countersink bit or just a small file? Cheers

Phil.