My original CARTER fuel pump.

[Fernando Mendes]

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.

[bach4660]

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

[Fernando Mendes]

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?

[bach4660]

a difficult number to find. I think the ratio is 6.6:1 but don't know how to calculate the compression

[Fernando Mendes]

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.

[Fernando Mendes]

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

[Fernando Mendes]

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.