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Old 05-14-2014, 07:00 PM   #1
ian1976
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2000 focus SPI piston ring gap orientation

Getting ready to put my pistons in my sohc motor and can't get find an illustration for the orientation of my rings. I have the ford manuals for the car and they say "use ring expander for rings and install piston" not very informative. Thanks in advance for any feedback.


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Old 05-14-2014, 07:59 PM   #2
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Haven't seen an SPI recommendation myself, every manual I've seen in the past mentions 120* intervals so you're putting the gaps at three different points of the circle. You also avoid lining them up at the 90* points - lined up with the wrist pin or front/back sides. Double oil control rings are offset about 20mm. then treated as one gap.

I'll move this to the SPI performance section where you'll find the most rebuild information.

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Old 05-14-2014, 08:03 PM   #3
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Generally you'd align the compression rings and oil ring gaps so that the gaps are offset. So if the top of the piston were a face of a clock, the top compression ring gap would be at noon, second compression ring gap at 4 pm, top oil control ring gap at 8 pm, oil control ring spacer gap at noon again, lower oil control ring gap at 4 pm. Simply put, there is no hard and fast rule; the gaps however should not align so as to form a passageway from the combustion chamber right through to the cylinder bore/crankcase.

Edit: sailor beat me to it.
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