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Old 02-09-2010, 08:49 PM   #1
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Default Is this a 95-97 9.0:1 Piston?

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By the raised center, I am guesing that it is, but all of the links to pics of the 94-95 8.8:1 and the 95-97 9.0:1 are broken. The engine that I took these from was 70 production units later than the 95 VIN cutoff for the later pistons, but I wanted to be sure before I put everything back together and cc'ed the block and head.

Thanks in advance,

Joe

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Old 02-09-2010, 09:09 PM   #2
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Im pretty sure thats the later one, from what i remember from reading all that stuff, someone else confirm? Oh yeah, just finish a fudgesickle?
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Old 02-09-2010, 11:10 PM   #3
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Yep, those are 9.0:1. Here's mine, ceramic coated though:

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Old 02-09-2010, 11:17 PM   #4
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If the middle section doesn't stick out its the 9.0:1
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Old 02-10-2010, 01:06 PM   #5
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Quote:
Originally Posted by 18psi View Post
If the middle section doesn't stick out its the 9.0:1
I would think that the stock 8.8:1 piston would have a center section that doesn't stick out. I have some stock 99 9.5:1 pistons here, that I took out of a stock 99 motor myself, and the center of those sticks out much further than these. The piston in the first pic definately has less compression than the 9.5:1 next to it in the pics below. The only missing piece here now is finding a good pic of the 94-95 8.8:1 piston.
Piston that I pulled from the 95 engine is on the left, 99 piston on the right:

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Old 02-10-2010, 11:59 PM   #6
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I can't find them now, but I believe there used to a side-by-side picture of an early 1.8L piston vs. the later showing the dish vs. dome on SoloMiata.
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Old 02-11-2010, 10:21 PM   #7
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Here's a pic of my old 94 1.8 block. The pistons are slightly domed.

The 1.8 block I have now from a 93 Protege the pistons are dished.
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