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Piston specs/comments please
Posted by PJ Cats (more from PJ Cats) on Sat, 14 Jul 2001 11:31:10
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Some posts below I asked about the possibility of a head and turbo swap from a 900 turbo to a 90/99 non turbo. I was warned about difference in pistons and compression, so I looked up the specs. Here's the lowdown:
Motortype B-20 and H H-turbo
compression 9.2:1/9.5:1 7.2:1/8.5:1
measures in mm
standard A 89.972-89.980 89.960-89.970
standard AB 89.980-89.986 89.970-89.976
standard B 89.986-89.994 89.976-89.986
standard C 89.994-90.010 89.986-90.002
1st oversize 90.472-90.487 90.460-90.475
2nd oversize 90.972-90.987 90.960-90.975
piston margin 0.014-0.040 0.024-0.050
I hope this diagram turns out legible. Well, in my opinion this means that the pistons in the higher compression machines (i.e. the 8-valve non-turbos) are somewhat larger. Even though very little, this might mean if you turbocharge them and combustion temperature increases, the pistons will get too large, get stuck and blow the engine. I'm still in doubt, though. I might just take the chance that the tolerances in my old machine (274.000 kms/±160,000 mls)have grown so much that I get away with it. Any ideas/criticism, please let me know.
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