Originally Posted by
houston
ok here it goes , i am rebuilding a sirio on road engine for a local friend , i have researched through boca , called a few well known engine guys that there engines are based off of sirio and cant get a definititive answer .
the rear main bearing on this s12-t3 i sti measures exactly 11.18 x 21.18 x 4.87 mm . what is the actual bearing size referred to when ordering a replacement ? 11.2 x 21 x 5MM?
Now that's a coincidence.
I bought 3 bearings for Sirio .12 from a shop that closed down.
Yesterday I wanted to replace the main bearing in one of my engines and it turned out that the first package I opened was the wrong bearing. It measured 11.2 x.21.2 x 4.9mm.
They all had the same product number and the other two bearing were 12x22x5.
You want that bearing?
PN me your address and I send it to you.