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Your head on its way to the hot tank looks better than when I got mine back. If only PO's knew how/when to change oil...
Haha. To be fair, those photos were taken after some simple green and a power washer.
Originally Posted by Arca_ex
If you're using stock cast pistons you're not going to get to the power levels where cylinder wall integrity becomes a problem anyways. You opted for a much weaker piston to get 83.225mm bore size if I'm reading the specs correctly, when you could have done 83.5mm with forged? The difference of 0.275mm bore size is not going to suddenly make it way more resilient, but using forged instead of the cast pistons definitely makes a difference in the 300whp+ range. Plenty of people running 83.5mm or 84mm bore sizes are at 400+whp, but stock cast pistons would be the weak link at that point.
I hope this isn't the last time I build this motor. I would like to keep this car for a while if possible, put lots of track time on it, and develop the car along with my skills. My current goals are sub 300whp. But if needed in the future, I wouldn't mind rebuilding to accommodate higher goals.
Very possible I could be making a mistake, but I considered a bunch of advice and experience on here. I appreciate your feedback though! Kinda wish I got it sooner.
[QUOTE=HalalBuilt;1645836]Haha. To be fair, those photos were taken after some simple green and a power washer.
I thought I was single handedly keeping Simple Green in business during my build. Simple Green and a crockpot is a very effective DIY hot tank for smaller brackets and hardware.
Everything is back from the machine shop. Got the crank polished, mains line honed, block decked (only needed a skim for a clean surface), and a 0.010" over bore. All the bearing clearneces were checked but I'll be checking them myself as well.
Time to get started I guess.
Still undecided on valves and springs. Leaning towards SuperTech valves and light double springs. Overkill? Warranted? I'm not sure.
Still undecided on valves and springs. Leaning towards SuperTech valves and light double springs. Overkill? Warranted? I'm not sure.
Scope creep kicked my ***.
Welp. That's that. Went with the Supetech light doubles springs and valves from Super Miata.
In the meantime I "ported" the head. Mostly just removed the casting flash, smoothed out some inconsistencies and removed carbon deposits.
Before shots:
After shots:
It doesn't look perfectly smooth but it's way better to the touch. Good enough I think.
Have to start assembling the head now. No more excuses that I can use unfortunately.
Question. In order to clean the head do I have to remove these two plugs (one of them in the center of the photo below)? I tried and they did not budge...
Wasn't totally satisfied with the port job, especially on the intake side right past the valves. So I took some time to get rid of the casting flash.
Before:
After:
Much happier with how those look and feel now.
Went on to try lapping in the new valves but the lapping tool I got from AutoZone is absolutely terrible. Wouldn't stick for ****. Even tried heating it up and hot gluing it to the valves. Ordered a new set. If those don't work I'll probably try another method.
Once the valves are lapped I'll clean and assemble the head.
Can anyone tell me about these two plugs? Worth removing to clean or will a through cleaning of the coolant galley be fine? Is it even coolant or is it oil? I can't seem to find any info on it. Checked forums and the service manual.
Lapped the valves. The new tool I ordered also sucked. I ended up just using some double sided tape to get the valves to stick to the tool. Got the job done.
Before and after lapping
Cleaned, primed, and painted the block. I think black would have looked better but I wanted a color that wouldn't make it hard to identify leaks. I'm not totally in love with the color but it serves it's purpose.
Assembled the head. This was by far the worst part of this whole process so far. Those damn valve retainers drove me insane.
I had the machine shop check clearances on the pistons and identify which piston goes in each cylinder but I just double checked to confirm. Everything looks good. Then set my ring gaps. I had trouble finding some solid information on suggested ring gaps for forced induction OEM oversized rings. Hopefully this is good.
Removed all the expansion plugs and brass oil plugs then cleaned the block as thorough as possible and installed the pistons. New plugs on the way.
Test fit the head to the block. I might take it off and spray the head gasket with Permatex 80065 High Tack Spray-A-Gasket Sealant. Not sure yet.
Thats about where the build stands. I have a few odds and ends coming in the mail. I have the Boundary oil pump and a Gates timing kit ready to go once I receive all the plugs. I cleaned the valve cover and oil pan. The aim is to drop the motor in next weekend.
02-02-2024, 01:59 AM
