Chris83zxt Posted July 30, 2013 Share Posted July 30, 2013 (edited) Tested by removing all plugs and fully opening TB while cranking. 145-150 on cylinders 1-5. 115 on 6. Dumped a little bit of oil in and up to 150. Therefore I imagine it's a damaged compression ring. Theres no appreciable amount of oil use. There is a little oil getting blown into the intake through the PCV system. The motor has 200k+ on it but it's running pretty good with the new intercooler and 11psi. There's a slight miss at idle sometimes and sometimes not. It rolled a fart can honda that tried to jump me pretty bad earlier tonight. I had plans on rebuilding with flat top pistons sometime in the 9-12mo timeframe. I wanted to go sequential spark and fuel via MS3 first. Should I rearrange my priorities and look to rebuild soon? What bad things could I be doing to the engine internals, long term, if I continue to run it (sometimes hard) with the damaged ring(s) in #6? Thanks for any input. (*edit - Tony D, I posted this before reading your response on zcar) Edited July 30, 2013 by Chris83zxt Quote Link to comment Share on other sites More sharing options...
Tony D Posted July 30, 2013 Share Posted July 30, 2013 I thought I recognized this from somewhere before... Quote Link to comment Share on other sites More sharing options...
Gollum Posted August 1, 2013 Share Posted August 1, 2013 Like tony said, run it till it's a REAL problem. It's still giving you compression and it's running, so just don't go crazy. I'm usually a fan of building a second motor on the side, instead of planning to re-do what you got, but that's 100% because I don't like downtime for ANY car. Downtime sucks, and I've experienced plenty of it and have grown to hate it. Spend the extra $50-300 to find a second block to build. And personally I approve of flat tops on a turbo build, but it really depends on application. As tony knows, a high compression turbo build is in my future, but it's going to be quite different than most builds. I'd say get the MS3 first though. Then you could even trim that cylinder back on timing to go easy on it. Odds are you might blow it up, and you'd much rather do that while learning MS3, than on your current EFI, just to then have to rebuild the motor and then learn MS3 tuning on a new build that you're scared to push. Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted August 2, 2013 Share Posted August 2, 2013 Probably a broke ring land. The top ring is hard to break. The second ring is cast iron. Quote Link to comment Share on other sites More sharing options...
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