Engine Cylinder measurements before and after boring


Post Reply
Hamza
New Member & Happy To Be Here
New Member & Happy To Be Here
Posts: 7
Joined: Mon Dec 24, 2018 4:57 am
Location: Karachi, Pakistan
Location: Karachi, Pakistan

Engine Cylinder measurements before and after boring

Post by Hamza »

Hi guys,

Working on a 79Z..

So I got the block bored out to 65.00 mm. I asked the machine shop to give me 0.04 mm of piston to wall clearance. Cylinders were not too out of round except cylinder 5 which I felt may need some work. Engine is in good health otherwise from the looks of it. Pistons from cruzinimage and then inspected under a measuring microscope (a tad of an overkill..had access thought i would break out the big guns).

I miced the bore gauge to 65.00 mm and took the following readings. My table shows the min and max recorded post boring. Before boring the table shows preop measurements. I read clearance is from 0.01 to about 0.09 mm?
Screenshot_20200801-174632_Excel.jpg
Pics of pistons measured 10 mm up from skirts. Effectively i think ill get a minimum of 0.02 mm if i match pistons to wall clearance. The issue is that I asked him to give me 0.04 mm across all cylindera, he reckons he measured all the pistons and cuz they were the same he bored it based on the one...I reckon thats a bit lazy and may explain the variation.

I think I can make it work...looking for some candid advise!
20200728_161509.jpg
20200728_154938.jpg
20200728_155002.jpg
You do not have the required permissions to view the files attached to this post.

Post Reply

Return to “ENGINES: Maintenance, Performance, Parts Sources”