Diamond Star Werks
Freelancer
- 3,246
- 224
- Jun 25, 2011
-
Inman,
South_Carolina
So my engine is at 90-100psi now. Deff am issue with the Rings. Around 10-15k into its life the tbelt stripped at the crank. I did hit the valves but it did not bend any at all. Car did sit with the head off for air 2 months.
Thing I noticed when I took the head off was that both thrust sides of the cylinder walls were worn. There was no cross hatch pattern left. The thrust walls were clean and shiny. This deff should not be like that as I've rebuilt a virgin block with mid 100k miles that still had the cross hatch left and I simply honed it as per the owner not affording to have it bored. Engine went together with good compression afterwards.
I do not know why this happened to my engine. I know power can do this but at that time it had never seen more than stock boost on the stock t25. Only mod being a set of aftermarket evo 8 cams.
This motor was done alil over 2 years ago. I was working Alot and left the assembly to (what I thought) more knowledgeable persons. And I had all machine work needed for head and block done. Gave it to the shop and said whatever needs done do it and ill pay. And I did. It was bored .040 and honed to match the pistons. They specifically said they would not bore it till they had the pistons.
And the guy my dad manages shop for assembled it for me as I didn't feel I had any time to do it myself.
So what I don't know us ptw and ring gap. I highly doubt the machine shop got ptw wrong being they waited for the pistons. So could incorrect ring gap cause this? I kinda fear that it was never checked and they were just installed as is.
Any ideas on what could have caused my car to lose compression so early in life or why my cylinders would wear so fast on the thrust side would be great. I am going to either re ring or rebuild sometime and I don't ever want this to happen a second time. I will be song everything personally this time and would like to figure out where the mistake could have been made so I can avoid it.
Thanks in advance and sorry for the long post.
Thing I noticed when I took the head off was that both thrust sides of the cylinder walls were worn. There was no cross hatch pattern left. The thrust walls were clean and shiny. This deff should not be like that as I've rebuilt a virgin block with mid 100k miles that still had the cross hatch left and I simply honed it as per the owner not affording to have it bored. Engine went together with good compression afterwards.
I do not know why this happened to my engine. I know power can do this but at that time it had never seen more than stock boost on the stock t25. Only mod being a set of aftermarket evo 8 cams.
This motor was done alil over 2 years ago. I was working Alot and left the assembly to (what I thought) more knowledgeable persons. And I had all machine work needed for head and block done. Gave it to the shop and said whatever needs done do it and ill pay. And I did. It was bored .040 and honed to match the pistons. They specifically said they would not bore it till they had the pistons.
And the guy my dad manages shop for assembled it for me as I didn't feel I had any time to do it myself.
So what I don't know us ptw and ring gap. I highly doubt the machine shop got ptw wrong being they waited for the pistons. So could incorrect ring gap cause this? I kinda fear that it was never checked and they were just installed as is.
Any ideas on what could have caused my car to lose compression so early in life or why my cylinders would wear so fast on the thrust side would be great. I am going to either re ring or rebuild sometime and I don't ever want this to happen a second time. I will be song everything personally this time and would like to figure out where the mistake could have been made so I can avoid it.
Thanks in advance and sorry for the long post.