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Tii piano piston


The Judge

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Piano top suggests your engine has an E12 head (cast into the left side of the head). Tii suggests it’s a high compression piston. If it’s a U.S. E12 head car with the factory pistons still in place, it’s likely a 9.0:1 compression ratio. But if the pistons have ever been replaced, it’s possibly a different compression ratio, say 9.5:1 or even 10.0:1. The “new” piston should match the remaining three “old” pistons as best as is possible, including weight and brand. In short, maybe photos and dimensions are in order. ?

 

Presumably, the old pistons are already out. What diameter are they: stock (88.95-ish), first oversize (89.25-ish), etc.?

 

Regards,

 

Steve

 

 

Edited by Conserv

1976 2002 Polaris, 2742541 (original owner)

1973 2002tii Inka, 2762757 (not-the-original owner)

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  • 2 weeks later...

As mentioned above, look at the top of the piston to determine the size or simply measure if you have access to an outside micrometer or a Vernier caliper. The original size is 88.97mm with the first overbore size being 89,22mm and second overbore being 89.47mm.  You can find the manufacturer by looking on the underside of the piston. It will likely be cast into the underside of the skirt "KS" (Kolbenschmidt) or "MAHLE". If you have the pistons out and your mechanic has access to the equipment to remove material without damaging the piston as well as an accurate scale, then you can balance the "new" piston to match the others; otherwise the current weight of it will be perfectly fine. If you cannot locate a piston, let me know as I have many that you could have an individual one for the cost of shipping.

shermanmartinez at Hotmail dot com

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