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B20 pistons 1800

posted by  jaydee on  Fri Nov 26 17:22 CST 2004
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last visit: Thu Oct 23 23:45 CST 2014
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I pulled all 4 pistons tonight from the B20 I have been disassembling over the past few weeks on and off. I found the reason there was such poor compression: broken top rings on numbers one, three and four cylinders. A fair amount of scuffing on the lower piston walls, like this thing had been run HARD!
Lower end bearings look great (will replace anyway) and rods and wrist pins in good shape. Cylinders appear to need only a bit of honing to remove some scuff marks.
I don't know what sort of pistons these might be. They are 0.30 over and marked 19750 and ID7. The pistons have a key-hole shaped aperature on either side of the wrist-pin, going right through the piston. Can anyone identify these pistons for me? Are they worth getting knurled if they are a bit out of round, or should I chuck them and get new ones?
Thanks
JD






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