Rebuilding my block
 

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.
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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

Piston to wall clearance. That's a spec given by the piston manufacturer as the value will change depending on the material used for the piston.

I'm taking all my stuff to the machine shop today to have everything rechecked.

Have them make sure the block is clean of all debis as well.

I'm running .018" Top and .024" on my 2nd ring on the stock bore CP's in my car. 350whp, 22psi.

Engine is back together and in. I'm not getting oil pressure though. Manually primed the pump, have cranked it over a whole bunch and nothing. Pulled the turbo feed line and nothing. Anyone got any ideas? Anything else I should be doing since I reused the oil pump? It is a boundary oil pump. I also installed an oil filter relocation kit..


**UPDATE** Oil filter lines were backwards, I got pressure now.

Was the relief valve clear of debris and free moving? Only other thing I’d do is crank with the plugs out and injectors unplugged.

Glad it was something easy. It's it running now?

Yes, she's alive. Bled the coolant now just got to fill the trans and take her out

She's alive, 50 (knocks on wood) trouble free miles so far.

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Nice man! Glad it's back!

Looks great man I'm glad it's back up and running!

Seems you work fast. Hoping this time all is good.

Looks good! Also to answer a question toward the beginning of the thread, I have ST Pistons and the suggested Wiseco rings. I used the clock diagram from Supertech. The rings should be pretty much 1:1 in terms of design (ring with a gap lol), I wasn't going to bet that on the pistons however and the location of the port holes etc. I figured it was safer to clock to Supertechs specifics.