21-06-2018, 08:36 PM
(This post was last modified: 21-06-2018, 08:38 PM by Andy Bennett.)
Following this slight diversion in the thread.
I am currently assembling bits for the new block I have.
As mentioned on previous thread my bores are 35 to 36 thou oversize (relatively rough vernier caliper measurement).
there is very light scoring in 1 bore and v small small steps at the top of the bores.
I have some second hand plus 30 pistons/rings etc but rather than hope that all is OK with them in the block, I am thinking that I should do the job properly and rebore.
So, my question (s), based on the comment from R above with A7 workshop pistons and the comment to rebore to the specific requirements of individual pistons, and previous comments re bore sizes at a tolerance of +0 to +5 thou.
What bore size do you specify to the machinist for +40 or +60 A7 workshop pistons?
And based on my current bores, what size would you go for, as it feels like plus 40 will likely be not enough material removal to ensure a clean bore and this is likely the only rebore I will ever need to do, so should I just go to +60?
Thanks for advice
Andy
I am currently assembling bits for the new block I have.
As mentioned on previous thread my bores are 35 to 36 thou oversize (relatively rough vernier caliper measurement).
there is very light scoring in 1 bore and v small small steps at the top of the bores.
I have some second hand plus 30 pistons/rings etc but rather than hope that all is OK with them in the block, I am thinking that I should do the job properly and rebore.
So, my question (s), based on the comment from R above with A7 workshop pistons and the comment to rebore to the specific requirements of individual pistons, and previous comments re bore sizes at a tolerance of +0 to +5 thou.
What bore size do you specify to the machinist for +40 or +60 A7 workshop pistons?
And based on my current bores, what size would you go for, as it feels like plus 40 will likely be not enough material removal to ensure a clean bore and this is likely the only rebore I will ever need to do, so should I just go to +60?
Thanks for advice
Andy
Enjoy yourself, it's later than you think!