turbogrill Posted January 29, 2021 Report Share Posted January 29, 2021 Hi, OEM Piston availability is getting difficult for my car, is aftermarket OK as long as the compression ratio is the same? Not sure what counts as OEM replacement here, maybe the rings are slightly higher/lower. thanks 1 Quote Link to comment Share on other sites More sharing options...
Technical Advisory Committee Chris Huggins Posted January 30, 2021 Technical Advisory Committee Report Share Posted January 30, 2021 This is a question for the Tech Desk. I'm questioning how NC miata pistons are getting hard to get? 1 Quote Link to comment Share on other sites More sharing options...
turbogrill Posted January 30, 2021 Author Report Share Posted January 30, 2021 4 minutes ago, Chris Huggins said: This is a question for the Tech Desk. I'm questioning how NC miata pistons are getting hard to get? Haha no. It's for my other rust bucket car that I can't let go. Quote Link to comment Share on other sites More sharing options...
MoparBoyy Posted February 1, 2021 Report Share Posted February 1, 2021 I dont see why it would have to be an actual OEM piston rather than a aftermarket oem replacement. 1 Quote Link to comment Share on other sites More sharing options...
TiredBirds Posted February 1, 2021 Report Share Posted February 1, 2021 I don't see how it would matter. If you had to go .030 over then what? Quote Link to comment Share on other sites More sharing options...
turbogrill Posted February 1, 2021 Author Report Share Posted February 1, 2021 The blocks are like $200, so would just get a new block Quote Link to comment Share on other sites More sharing options...
Technical Advisory Committee Ray Franck Posted February 2, 2021 Technical Advisory Committee Report Share Posted February 2, 2021 On 1/29/2021 at 1:22 PM, turbogrill said: Hi, OEM Piston availability is getting difficult for my car, is aftermarket OK as long as the compression ratio is the same? Not sure what counts as OEM replacement here, maybe the rings are slightly higher/lower. thanks OE or OE equvalent part for that specific model is quoting the rule, 4.7.1.. Factory recomended overbore is allowed. Quote Link to comment Share on other sites More sharing options...
turbogrill Posted February 2, 2021 Author Report Share Posted February 2, 2021 1 minute ago, Ray Franck said: OE or OE equvalent part for that specific model is quoting the rule, 4.7.1.. Factory recomended overbore is allowed. I guess the problem is what that means, seems like it can be subjective at some point. I am going to go with as along as the shape of the piston is similar and compression rate is the same it's OK. Quote Link to comment Share on other sites More sharing options...
TiredBirds Posted February 2, 2021 Report Share Posted February 2, 2021 12 hours ago, turbogrill said: I guess the problem is what that means, seems like it can be subjective at some point. I am going to go with as along as the shape of the piston is similar and compression rate is the same it's OK. I'd think wit and enduro car you wouldn't too much bore, not like a drag car where you can fill 1/2 the block. annnnnd... there are other ways to pick up compression. 1 Quote Link to comment Share on other sites More sharing options...
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