01-05-2010, 05:44 PM
Join Date: Jan 2008
Location: Knoxville, TN
Total Cats: 12
Advice needed inside, plz.
So my car needed a running motor 6 months ago.
I've got enough parts to assemble a few engines but I need advice on what to do or what would be the easiest or the most practical choice.
My built 94 motor took a hit, pistons seemed fucked but not as bad as I thought, possible salavagable, rods are fine. Block is the worst, it would need require some work, the cyclinder walls have some major vertical scouring.
The $50 94 motor had LOTS of carbon buildup, but I could still see the cross-hatches. Failed the compression check with it's original head, figured it was the HG. Swapped me 99-00 head on the block, still shitty compression. Drop some oil in the cyclinders and it reads 30psi more on each cyclinder (all sub-100psi) :(
The original 97 motor is fine, had a spun bearing. Block is fine, crank is even ok, its just completely disassembled.
Now heres where you guys will hate me. I sold my turbo kit morely for the money and it has been collecting dust. So I came across a really good local deal on a Fuji IRTB kit. I always have been interested in them so I decided to see what they're all about.
Go the cheap route, get new OE rings, put them on the pistons in the 156k motor, call it day.
Put new OE rings on the 97 pistons, put it in the 156k block.
Get high CR pistons (11:1, 84mm supertech's), put them on my crower rods, new bearings as well, machine work. Sell my 9:1 CR JE pistons
Get high CR pistons (11:1, 84mm supertech's), put them on the stock 94 rods, new bearings as well, machine work. Sell the 9:1 JE's and Crower rods to compenstate for money.
My future FI plans for this car are Rotrex. I might do a turbo build on a different miata way down the road but the reliablity factor of the Rotrex is just too tempting. From my understanding (fourm trolling) running high CR pistons with the Rotrex isn't a bad thing. So I could possible be making a dual purpose ITB/Rotrex engine.
Just looking for some advice on this. I'm tired of the car sitting in the driveway collecting pine needles and leaves!