Machining on the lathe - Piston re-dishing, Part 1

Here is another machining video of turning
On the lathe, and here I am showing my method of re-dishing piston crowns in order to help engine builders get the correct combination to achieve the correct static compression ratio when building there engines. As ever with my channel, this shows a typical example for a 1275 type A-series engine. There are more than that ne way to do this, but this I how I do it.

[@Cobra427Veight]

I've machined 1000s of pistons in the 80s and 90s , below the oil ring land is cam ground or diamond turned, all the ring lands I've clocked have been round .

[@ACDodd]

Thanks for that input, it seems some are, and some aren’t when it comes to the A-series engines

[@disturbedrocks1996]

I love your accent!! Thanks for the video, bud!!

[@robakagyser2300]

I enjoyed watching this video. Interesting topic. Thank for the video
- Rob in Tennessee USA

[@ACDodd]

Thanks for the kind comment Rob.

[@StefanMiniCooper]

Interesting video👍really nice craftsmanship

[@thomasclassicandmodern]

Great to see a how to on these!!
I know what the finished results look like as they are pretty regular job you do for us and always superb !! Thank you 👍👍

[@ACDodd]

Thanks Ross!

[@dennisvaneck9406]

Great visual demonstration of the ovality of a piston. Thank you for that. Perhaps you could move the DRO to show the taper of the skirt.

[@onepairofhands]

nice set up on holding the piston, and machining thereafter

[@tarekessed3036]

Great 👍

[@AmrinderSingh-zx9hr]

Very Good Video.!
Please tell me,
Can I cut forged piston 6mm from the top.

[@ACDodd]

I can’t answer that because i don’t know what thickness crown you have, it is unlikely as 6mm is usually the thickness that they are originally made.

[@mugeldavid4607]

its difficult (nearly impossible) to clean the pistons after machining with the rings still in the grooves.

[@ACDodd]

Correct, the engine builder will be doing that before they are used.

[@RyanBurisch]

Cool! Do you think this would be possible on a Myford ML7 - 84mm piston?

[@ACDodd]

Yes but you might struggle to get the radius in the corner on a smaller lathe.

[@alangiaconelli2919]

Im wondering if those rings are doing there own cutting

[@ACDodd]

No.

[@jonstout9236]

Like the video. Are you not compromising combustion efficiency just expanding in a step fashion?

[@ACDodd]

Has not been reported back as an issue.

[@opieshomeshop]

Not sure why they don't make aftermarket flat top pistons if raising compression is an issue.

[@ACDodd]

Raising compression is no problem, and they do make flat too pistons