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Cylinder Hone or bore out? How to decide

  • Thread starter Thread starter bwanna
  • Start date Start date
B

bwanna

Guest
Hi and thanks ahead of time for reading my post.

I have an 82' GS450TZ that I upgraded the jugs/pistons to 500 about 2 years ago. In that upgrade, I forgot to de-glaze the cylinders and installed new rings. On completion the compression was within specs on both sides.

Lately, I've noticed the engine doesn't have the same power (slightly) and the compression is lower on the right side. In planning a winter time project, I've contemplated pulling the top end to do the job right and wanted to get some opinions.

Some choices I'm figuring:
1. Deglaze & new rings to current pistons
2. Hone & new rings to current pistons
3. Bore to 5 or 10 over and new rings to new pistons.

Any other choices?

So, what does everyone think?
 
There's no way to know what's wrong (if anything) until you assess and carefully measure the bores. Of course, valve issues could cause the same symptoms.
 
Have you checked valve clearances, THEN done a compression check on a WARM engine with the throttle held fully open? :-k

.
 
Not to be a trouble-maker or anything....but, isn't #1 and #2 the same thing?
Maybe I've been working on VW diesels too long........................
 
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