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Have the big end resized with a 1mm offset so that the rods shorter.
But why do you want 1mm shorter?

If you are messing around with the position of the piston in comparison to the head go all the way or none at all.
Your piston should either be as close to the head as possible +/-1.5mm or les or more than 2.5 mm away or you will struggle excessively with detonation.
 

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Stock 1800 turbo as in 75 turbo motor or 1800 Alfetta with a turbo bolted to it?

Then again is it running?
What are and will you be boosting?
Keep it as is if i remember correctly the cr on the 1.8 was 9 to 1 so why change it? We have proper management that can manipulate timing and fuelling which they could not do in the 80’s so they lowered the cr.
Today we do not do that anymore we are out of the dark ages at last.:thumbs:

If you really want to pull the piston down pull it at least 2mm nothing less.
Then you can tell everybody that you boost 1.5bar.
The fact that you make the same power that you would have made at 0.8bar with oe cr apparently does not matter for some people.
It is all about how high they can boost.
 

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So true perfect way to explain it , I'll jus get a set of rods shortened just to have spare in case some thing brakes
do not mess with your motor.
you had it at 0.8 with no problim so 0.5 will be boring but safe.
and you do not need knock sensors since the cr is low as is.
 
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