Page 368 - EA20_LR

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TECH & INSTALLATION TIPS NOTES

Piston to cylinder wall clearance
Piston to cylinder wall clearance for 4032 Alloy:
1. Piston diameter must be measured at gauge point which, in most cases, is 12,7 mm up from the bottom of skirt.
Dimensions listed are gauged at a temperature of 20 degrees C. Note: aluminum expands and contracts with temperature
variations.
2. Your pistons are manufactured from 4032 high silicon aluminum alloy.
3. Clearance is built into piston based upon finished bore for normal operating conditions.
4. Clearances listed below are minimum. Some applications such as supercharged, turbo, nitrous and endurance
applications may require 0,025-0,076 mm to be added to the minimum clearances. Cold water pickup marine applications
may require an additional 0,051-0,102 mm clearance.

Bore Range Min. Clearance Sport compact:
63,50-92,00 mm = 0,050-0,064 mm
92,00-101,60 mm = 0,063-0,076 mm

Piston to cylinder wall clearance for 2618 Alloy:
1. Piston diameter must be measured at gauge point which, in most cases, is 12,7 mm up from the bottom of skirt.
Dimensions listed are gauged at a temperature of 20 degrees C. Note: aluminum expands and contracts with temperature
variations.
2. Your pistons are manufactured from 2618 low-silicon aerospace aluminum alloy.
3. Clearance is built into piston based upon finished bore for normal operating conditions.
4. Clearances listed below are minimum. Some applications such as supercharged, turbo, nitrous and endurance
applications may require 0,025-0,076 mm to be added to the minimum clearances. Cold water pickup marine applications
may require an additional 0,051-0,102 mm clearance.

Bore Range Min. Clearance Sport compact:
63,50-92,00mm = 0,076-0,089 mm
92,00-101,60mm = 0,089-0,102 mm

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