Subaru Pistons


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High Performance Subaru Pistons

For motors running greater than 10bls of boost it's a good idea to have race pistons. Available in assorted compressions ratios, our pistons are considerably stronger for those higher horsepower motors.  Here you can see a stock cast piston next to one of our high performance forged race pistons.  Race pistons are noticeably heavier due to their beefy construction, but some of this is compensated for with lighter but stronger matching wrist pins. You get more durability from noticeably thicker ring glands for strength and larger oil holes for added lubrication.  All this helps to withstand higher temperatures that can be generated from high boost turbo motors.

Another benefit from race pistons is the dome shape.  Stock pistons can hit the valves if you break a timing belt.  Race pistons are shaped in the dome area with sufficient clearance to prevent this potential risk.  Breaking a timing belt can ruin your weekend, everything stops, not to mention a healthy repair bill for a valve job.  The same broken timing belt on a SOHC engine can be repaired in the field with a few tools, and a new timing belt if you have our pistons in your motor.

As timing belts get old, they can also jump a cog in certain unusual situations.  Here again, if you try to start up the motor in this condition, a valve or two can be hit by the pistons, ruining your weekend. Preventing this kind of ruined weekend is minimized with our domed pistons, not to mention the potential cost savings of a needless valve job.  By the way, you should check your timing belt every couple of years to insure sand isn't causing any unusual wear.

Here you can see the difference in wrist pin weight.  The pin with the thinner wall is lighter, but actually much stronger due to the materials it's made of.  Inside the pistons you can see the better construction of the forged race piston with more reinforcement versus the stock cast piston .  When you compare these pistons in person you'll notice the dome of the race piston is also thicker for added strength and heat dissipation, which allows it to withstand more punishment.



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