Chris Duncan Posted October 3, 2013 Share Posted October 3, 2013 Running a 280z in Chumpcar/Lemons endurance racing. doing a hone and re-ring on a used L28 out of a ZX should I use cast iron rings or moly? if cast iron what is a good source? I bought some Grant rings, the top ring doesn't look chrome but the instructions say they are moly? Quote Link to comment Share on other sites More sharing options...
BluDestiny Posted October 3, 2013 Share Posted October 3, 2013 If it's chump cars, shouldn't you use the cheapest one? Also I thought the material of the rings is depended on the roughness of the hone. Quote Link to comment Share on other sites More sharing options...
Chris Duncan Posted October 3, 2013 Author Share Posted October 3, 2013 If it's chump cars, shouldn't you use the cheapest one? Also I thought the material of the rings is depended on the roughness of the hone. I found the Grants for cheap but reading the forum they seem to prefer cast iron? I'm just doing a bare minimum hone. Quote Link to comment Share on other sites More sharing options...
seattlejester Posted October 3, 2013 Share Posted October 3, 2013 (edited) From what I recall when I did my rebuild: Three types of rings Cast was preferred for a street rebuild, in addition it is cheap, regular hone, etc Moly was preferred for high speeds, better oil retention, requires a smoother hone but traded off with longevity, a littler harder and causes the cylinder walls to wear at a slightly faster rate. Chrome will wear the cylinder walls down since they are much harder, takes a lot longer to break in, requires a really smooth hone so it doesn't catch on the walls. I think my block still had the stock cross hatching when I took it apart, I would go for cast if available. I think they were 40$ for a set when I bought mine. Edited October 3, 2013 by seattlejester Quote Link to comment Share on other sites More sharing options...
Chris Duncan Posted October 14, 2013 Author Share Posted October 14, 2013 Gonna go with the Grant Moly's since they are in hand and got them for $32.00 going with a 240 grit hone per the instructions. Not sure if the cast iron's would hold up to endurance racing anyway. Quote Link to comment Share on other sites More sharing options...
Tony D Posted October 14, 2013 Share Posted October 14, 2013 The stated ring characteristics are for use in American Blocks...none of them really apply to Nissan Blocks with their high Nickel Content... All characteristics otherwise are the same, it just affects how fast the RINGS wear out (which is what happens in Nissan's: the rings wear, not the block!) Quote Link to comment Share on other sites More sharing options...
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