IRP FA20 Forged Piston Set 10.5CR

DESIGN INNOVATION AND ADVANCED TECHNOLOGY

RalliSpec has adopted IRP across our engine product line owing to their advanced design features and unmatched quality control protocols. Every piston starts with the latest material technology from the highest quality sources. IRP forgings are 100% machined meaning all surfaces are machined using the latest generation 5 axis CNC equipment in a temperature controlled environment ensuring precise dimensional control. All IRP pistons incorporated a bridged and strutted construction for strength and stiffness and a skirt coating for friction reduction. Each piston undergoes extensive quality controls and every critical dimension and weight is recorded in their systems for future reference.

These FA20 pistons utilize a 2618/A1 material for high strength and detonation resistance. The crown and ring land surfaces have been hard anodized for wear resistance and thermal control. A sacrificial skirt coating reduces friction and allows the piston to precisely conform to the bore. A short length high strength piston pin with a 0.225in wall thickness supports significant power levels. Piston rings are the highest quality Japanese-sourced reduced-tension rings for superior blow-by and oil control.  Top ring sealing is assisted by the use of lateral gas ports.

We highly recommend these pistons for all types of applications and power levels. They can and should be run with tighter clearances than might be typical for a 2618 piston due to the precise dimension control and crown coating. For this reason along with the wear resistance provided by the hard anodizing these pistons can be used without compromise in everything from a daily driven street application to a highly competitive racing application.

Piston Specs:

• Compression Ratio = 10.5
• Cylinder Bore Sizes = 86.0mm, 86.25mm
• Piston Alloy = 2618/A1
• Recommended Bore Clearance = .0018 to .0027in
• Piston Pin Wall Thickness = .225in
• Applications = FA20F