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-   -   Need 2.7 piston and cylinder sizes (http://forums.pelicanparts.com/911-engine-rebuilding-forum/428485-need-2-7-piston-cylinder-sizes.html)

84toy 09-03-2008 01:54 PM

Need 2.7 piston and cylinder sizes
 
Waiting for my service manual to arrive but I would like to continue on ...Could someone post the sizes, tolerances and clearances of 2.7 KS piston and cylinders?

Need:
piston and cylinder size and tolerance (group 2)
piston total allowable clearance
max egg shape of cylinder

Thanks in advance...

356RS 09-04-2008 10:13 AM

Paul,

KS group 2 cylinder: 90.020 - 90.030 Piston diameter: 89.990 +- 0.0005
Cylinder / piston clearance: 0.025 - 0.045
Cylinder ovality max: 0.04

Alusil group 2 cylinder: 90.020 - 90.030 Piston diameter: 89.972 - 89.987
Cylinder / piston clearance: 0.035 - 0.060 wow

Mahle "LS" group 2: 90.024 - 90.036 Piston diameter: 89.984 - 89.996
Cylinder / piston clearance: 0.028 - 0.052

84toy 09-04-2008 10:46 AM

Thanks! Just what I needed


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