Ken,
What grade of fuel do you run?
bs
Freese, Ken wrote:
> I cleaned up the compression reading columns.
> Ken
>
> Saturday, I removed the head from my BJ8 to have steel valve seats
> installed because of #4 exhaust valve recession and low compression. I
> figured #4 was now burned enough, I should get it fixed. After putting
> on the hardtop on New Years, I could hear rougher running.
> Now I see that #2, 3, and 4 pistons have 1/16 to 1/8 inch notches
> missing and I can see the top ring on #4. Preliminary inspection of the
> notches don't show smooth melting. So, new set of problems. I figure the
> causes are:
> 1. Swallowed debris
> 2. Detonation
> 3. Defective pistons
> Incidental facts:
> A - oil never filtered only changed for about the past 40000 miles due
> to faulty spin on filter adapter.
> B - last rebuild in 1982 and 70000 miles ago due to melted pistons
>
> Compression 1997 Compression 2004 Compression 2007
> 165 130 110
> 155 135 90
> 150 145 70
> 150 90 70
> 155 130 115
> 175 150 145
>
> Any thoughts on the cause until the pistons are actually out?
> Ken Freese
> 65 BJ8
>
>
***************************************************************
Bob Spidell San Jose, CA bspidell@comcast.net
'67 Austin-Healey 3000 '56 Austin-Healey 100M
***************************************************************
|