Fernando Mendes Posted March 24, 2018 Author Report Share Posted March 24, 2018 Each cylinder average: cylinder nr 1 :86,25 cylinder nr 2: 77,5 cylinder nr 3: 82,5 cylinder nr 4: 85 cylinder nr 5: 77,5 cylinder nr 6: 82,5 Total average:86,25+77,5+82,5+85+77,5+82,5=491,25 491,25:6cy=81,9psi. Cylinders nr 2 and nr 5 are with valve leakage or other problems(worn rings).I do not know which is the correct compression ratio nor compression pressure for mine IND-251. 1 Quote Link to comment Share on other sites More sharing options...
bach4660 Posted March 26, 2018 Report Share Posted March 26, 2018 I think on these motors you need a difference of 25 to be definite valves, I think 5-10 difference between cylinders is within limits Quote Link to comment Share on other sites More sharing options...
Fernando Mendes Posted March 26, 2018 Author Report Share Posted March 26, 2018 12 hours ago, bach4660 said: I think on these motors you need a difference of 25 to be definite valves, I think 5-10 difference between cylinders is within limits Yes,after I was watching a paper that says difference of 25.My engine differences is only 4 psi.And what do you think about the compression ratio and compression pressure? I was looking for in various papers but did not find nothing.In B3-B driver's manual does not have.Years ago a mechanic I had said to me he found 120,110psi in this same IND-251.Why now it is only 90,80? Quote Link to comment Share on other sites More sharing options...
bach4660 Posted March 27, 2018 Report Share Posted March 27, 2018 a difficult number to find. I think the ratio is 6.6:1 but don't know how to calculate the compression Quote Link to comment Share on other sites More sharing options...
Fernando Mendes Posted March 27, 2018 Author Report Share Posted March 27, 2018 6 hours ago, bach4660 said: a difficult number to find. I think the ratio is 6.6:1 but don't know how to calculate the compression Wow.Now is more easy to find the compression pressure.Thanks. Quote Link to comment Share on other sites More sharing options...
Fernando Mendes Posted March 27, 2018 Author Report Share Posted March 27, 2018 2 hours ago, Fernando Mendes said: Wow.Now is more easy to find the compression pressure.Thanks. RATIO.........PRESSURE 6.5.................110 7.0.................120 7.5.................130 8.0.................140 Quote Link to comment Share on other sites More sharing options...
Fernando Mendes Posted March 27, 2018 Author Report Share Posted March 27, 2018 bach4660, I found today a register about a compression pressure of my IND-251 engine in june,25th 1989.It was with 110 psi.Almost 29 years after it is with 82psi average. Quote Link to comment Share on other sites More sharing options...
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