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  #54  
Old 01-31-2023, 04:12 AM
Dragncar Dragncar is offline
Ultimate Warrior
 
Join Date: Mar 2004
Location: Humbolt County California
Posts: 8,284
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I did some testing today with the last sonic tester I bought.
First I used a 4" inside dia air cylinder . The distance under the flat spot of the probe is only .007-.008. Not much.
The cylinder was .131 thick checked with calipers. Used 46 hyd oil on the probe, tested on the outside and it read .134, pretty good.
But on the inside it read .163, not so good. A difference of .029 of what it actually is.

Then I tested a plain steel pipe section, 3" inside dia, .233 thick. Checked on the outside and it came in at .232, very good.
But the inside, where it counts was also a problem. It came in at .278. A .046 difference. Big problem.

So I tried to buy just the probe so I could contour it to the inside of a Pontiac bore with emery cloth and see how that works. Probe was 80 $. But I found a different sonic checker that said it does 2 types of cast iron for the same 80 $. So I ordered it.
It will be here the 2nd and I will let you guys know how it works out.
This is the one I bought. My 3rd (sent one back)
https://www.amazon.com/gp/product/B0...1AI5Y5G6&psc=1

I need a junk Pontiac block so I can cut out a chunk of a cylinder wall for testing.