If you haven't heard about what happened to my built motor see HERE . I got my block back from the machine shop got new bearings, pistons and rings. Supertech pistons and wiesco rings. I am attempting to reassemble the block myself. My first question is, do I use supertech's piston ring chart or wiesco's chart? Any other tips or recommendations please feel free to post.

 

i bought the supertech pistons and rings as a set, subbing for info.

my only problem is the gap, i don't have that cute device you have...

 

Supermiata and TSE both sell Supertech pistons and weisco rings, if that's any help to you...

https://supermiata.com/supertech-pistons-miata.aspx

Bottom End

Edit: oops, ring chart, my bad. I thought you were asking which rings to use.

 

Yea I already have everything. I'm pretty sure I should use wiseco's ring chart but I wanted to confirm it first.

 

Wisecos.

 

i think you should stick with what the piston manufacturer says, not the ring's...

 

Going with the same CR as the last setup?

 

Man, where's the love?

 

Yes

 

Some unsolicited life advice. Pull the brass galley plugs and clean out all your galleys if you didn't already. Will need new plugs to replace them. Bit hard to tell from the pic but that plug looks old. I pull the restrictor out of the top of the block and replace that too so you can clean behind it. Pretty normal to have a ton of debris in there after any machine work. Shops will tell you they've "cleaned the block". I rarely take anyone's word for stuff like this.

https://www.miataturbo.net/general-m...9/#post1454007

 

this is true, i had a friend trust this and spun his bearings within 50 miles of start up....

 

Use a rifle cleaning kit.

 

Good idea guys.

So back to rings. I was gonna go with .017 and .018, problem is that my lower rings are already .021 and .022. did I get a bad set of rings? I had to file the top rings to achieve the .017 so no problem there. Lower rings are much larger. Should I just go with .019 for top or?

 

What hp level? Are you planning to track it?

 

300 ish, 90% track and autocross use 10% street.

If I use supertech's chart I'm good to go at .017 upper and .021 lower. wiseco calls for .018 lower with .017 upper.

 

What would be the max ring gap I could run without excessive blow by and compression loss? It's looks like I'm going to have to run .019-.020 upper rings and .022-.024 lower rings.

 

I can tell you that I'm planning to try and hit 400hp. On Wiseco Rings and Supertech pistons, I'm at .019 (1st), .023 (2nd), .017 (oil rings). I'm happy with my decision so far. But I don't plan on using this for track (much). Certainly not at 400hp.

I'd go about 1mil less than me if I were you. Just make sure you are confident you can get perfectly crisp and square ring gaps. Don't be afraid to throw out a set if you screw up.

 

I think my cylinder bores are slightly too large for 83.5 mm pistons. when I drop the lower rings in to measure initial gap they are already too large at .024-.025. So I think I need to have the block board for 84 mm pistons and rings. Thoughts?

 

What P2W did they bore it for?

 

P2W? They told me for 83.5 mm pistons