SloRolla Posted December 30, 2018 Report Share Posted December 30, 2018 Hey guys! So while i'm building my 5k, I have gotten to the point of putting the pistons in. I'm using 40 thou over and rings to suit. However, when I compress them with the tool, it doesn't compress right round equally. and so when I try and lighty tap them into the cylinder they instantly bind. Is this a common problem or am I doing something wrong? I've gapped them to their spec. (Everything is well lubed up and this is how I do it at work and no problems) Cheers! Quote Link to comment Share on other sites More sharing options...
Taz_Rx Posted December 30, 2018 Report Share Posted December 30, 2018 I just gapped a set of rings for my 5k the other day. What clearance did you do them too? If you did it properly and they were fine sitting in the bores on their own then the problem must lie in the ring/piston combo! Got a set of verniers? Compare the ring depth to the groove in the piston. Quote Link to comment Share on other sites More sharing options...
Banjo Posted December 30, 2018 Report Share Posted December 30, 2018 (edited) Hi James, Very common problem, with the cheaper type of ring compressors, most of us have. This video explains the issue perfectly, if everything else you have done so far, is as per the book. https://www.youtube.com/watch?v=v1bKOQWVOaE https://www.ebay.com.au/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=tapered+bore+ring+compressor&_sacat=0 There is also an adjustable tapered ring compressor, which are a lot cheaper, but I've never used one, so can't vouch for it. https://www.ebay.com.au/itm/4-000-4-060-Aluminum-Adjustable-Piston-Ring-Compressor/311749924622?hash=item4895be570e:g:hosAAOSwK~RaBQLn:rk:3:pf:1&frcectupt=true Maybe someone else on here that has used one, might like to comment. Cheers Banjo Edited December 30, 2018 by Banjo Quote Link to comment Share on other sites More sharing options...
SloRolla Posted January 3, 2019 Author Report Share Posted January 3, 2019 On 12/31/2018 at 8:25 AM, Taz_Rx said: I just gapped a set of rings for my 5k the other day. What clearance did you do them too? If you did it properly and they were fine sitting in the bores on their own then the problem must lie in the ring/piston combo! Got a set of verniers? Compare the ring depth to the groove in the piston. Cheers for the reply Taz, I've been using this as a guidepiston ring clearance: Ring End Gap: Top compression ring 0.10-0.28mmLower compression Ring: 0.15-0.30mmOil ring: 0.2-0.7mmRing clearance in groove:Top compression ring: 0.03mm-0.07mmLower compression ring: 0.09-0.06mm not sure if that's good or not, what kind of gapping would you recommend? On 12/31/2018 at 9:31 AM, Banjo said: Hi James, Very common problem, with the cheaper type of ring compressors, most of us have. This video explains the issue perfectly, if everything else you have done so far, is as per the book. https://www.youtube.com/watch?v=v1bKOQWVOaE https://www.ebay.com.au/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=tapered+bore+ring+compressor&_sacat=0 There is also an adjustable tapered ring compressor, which are a lot cheaper, but I've never used one, so can't vouch for it. https://www.ebay.com.au/itm/4-000-4-060-Aluminum-Adjustable-Piston-Ring-Compressor/311749924622?hash=item4895be570e:g:hosAAOSwK~RaBQLn:rk:3:pf:1&frcectupt=true Maybe someone else on here that has used one, might like to comment. Cheers Banjo yeah I've seen those, I might have to resort to them. Or else scab around work and see what I can get. Cheers fellas Quote Link to comment Share on other sites More sharing options...
kickn5k Posted January 4, 2019 Report Share Posted January 4, 2019 (edited) What type of 5k? Mild, hot, boosted? A mild 5k id go, 0.3mm on the top two rings(could run the second a touch tighter on a stock N/A) and oil ring rails 0.27-0.3mm. Never file the expander(zig zag ring)of a 3 piece oil ring it sets the tension. Usual rule of thumb is 4 thousandths of an inch per inch of bore diameter. Plus more for boosted engines. Edited January 4, 2019 by kickn5k Quote Link to comment Share on other sites More sharing options...
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