991 Internals?
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The pistons etc are all strong. You won't find anything stronger (barely) then what Porsche has in it. I even ran it with a 150 shot and now going 200. No issues at 150....
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From: Savannah GA
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That's very impressive for factory internals!
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Jeff are you leaving the integrals alone on your build?
Taken from the Porsche Tech Doc:
Similar to the previous model, forged aluminum pistons are used to reliably achieve
the high power values of the new engine. Many details of the piston rings were
improved to minimize frictional losses and a DLC coating was also applied to the
first ring. To reduce lateral forces and ensure reliable transmission of the enormous
gas forces from the piston to the crankshaft, the connecting rod was modified compared
with the previous model.
A computer-optimized design of piston and connecting rod in combination with a
short compression height permits the components to be designed with an optimum
power-to-weight ratio. The low mass forces bring about a reduction in the crank
drive loads and enhance the smooth running of the engine.
To ensure the load capacity of the new 911 Turbo engines as well as the higher
power and torque values, the pistons were strengthened and adapted. This made it
possible to increase the maximum peak pressures by more than 10% and considerably
improve internal efficiency. As a result, it was also possible to achieve the
increases in power compared with the previous models at comparable boost pressures
using new thermodynamic tuning (e.g. valve timing and timing angle)
Similar to the previous model, forged aluminum pistons are used to reliably achieve
the high power values of the new engine. Many details of the piston rings were
improved to minimize frictional losses and a DLC coating was also applied to the
first ring. To reduce lateral forces and ensure reliable transmission of the enormous
gas forces from the piston to the crankshaft, the connecting rod was modified compared
with the previous model.
A computer-optimized design of piston and connecting rod in combination with a
short compression height permits the components to be designed with an optimum
power-to-weight ratio. The low mass forces bring about a reduction in the crank
drive loads and enhance the smooth running of the engine.
To ensure the load capacity of the new 911 Turbo engines as well as the higher
power and torque values, the pistons were strengthened and adapted. This made it
possible to increase the maximum peak pressures by more than 10% and considerably
improve internal efficiency. As a result, it was also possible to achieve the
increases in power compared with the previous models at comparable boost pressures
using new thermodynamic tuning (e.g. valve timing and timing angle)
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Joined: Apr 2008
Posts: 673
From: NE
Rep Power: 81
Taken from the Porsche Tech Doc:
Similar to the previous model, forged aluminum pistons are used to reliably achieve
the high power values of the new engine. Many details of the piston rings were
improved to minimize frictional losses and a DLC coating was also applied to the
first ring. To reduce lateral forces and ensure reliable transmission of the enormous
gas forces from the piston to the crankshaft, the connecting rod was modified compared
with the previous model.
A computer-optimized design of piston and connecting rod in combination with a
short compression height permits the components to be designed with an optimum
power-to-weight ratio. The low mass forces bring about a reduction in the crank
drive loads and enhance the smooth running of the engine.
To ensure the load capacity of the new 911 Turbo engines as well as the higher
power and torque values, the pistons were strengthened and adapted. This made it
possible to increase the maximum peak pressures by more than 10% and considerably
improve internal efficiency. As a result, it was also possible to achieve the
increases in power compared with the previous models at comparable boost pressures
using new thermodynamic tuning (e.g. valve timing and timing angle)
Similar to the previous model, forged aluminum pistons are used to reliably achieve
the high power values of the new engine. Many details of the piston rings were
improved to minimize frictional losses and a DLC coating was also applied to the
first ring. To reduce lateral forces and ensure reliable transmission of the enormous
gas forces from the piston to the crankshaft, the connecting rod was modified compared
with the previous model.
A computer-optimized design of piston and connecting rod in combination with a
short compression height permits the components to be designed with an optimum
power-to-weight ratio. The low mass forces bring about a reduction in the crank
drive loads and enhance the smooth running of the engine.
To ensure the load capacity of the new 911 Turbo engines as well as the higher
power and torque values, the pistons were strengthened and adapted. This made it
possible to increase the maximum peak pressures by more than 10% and considerably
improve internal efficiency. As a result, it was also possible to achieve the
increases in power compared with the previous models at comparable boost pressures
using new thermodynamic tuning (e.g. valve timing and timing angle)
Is that recent for the 991.2? Or was that published for the 991.1 or 997.2?
Thanks
Registered User
Joined: Jan 2009
Posts: 760
From: Austin, TX
Rep Power: 76
Taken from the Porsche Tech Doc:
Similar to the previous model, forged aluminum pistons are used to reliably achieve
the high power values of the new engine. Many details of the piston rings were
improved to minimize frictional losses and a DLC coating was also applied to the
first ring. To reduce lateral forces and ensure reliable transmission of the enormous
gas forces from the piston to the crankshaft, the connecting rod was modified compared
with the previous model.
A computer-optimized design of piston and connecting rod in combination with a
short compression height permits the components to be designed with an optimum
power-to-weight ratio. The low mass forces bring about a reduction in the crank
drive loads and enhance the smooth running of the engine.
To ensure the load capacity of the new 911 Turbo engines as well as the higher
power and torque values, the pistons were strengthened and adapted. This made it
possible to increase the maximum peak pressures by more than 10% and considerably
improve internal efficiency. As a result, it was also possible to achieve the
increases in power compared with the previous models at comparable boost pressures
using new thermodynamic tuning (e.g. valve timing and timing angle)
Similar to the previous model, forged aluminum pistons are used to reliably achieve
the high power values of the new engine. Many details of the piston rings were
improved to minimize frictional losses and a DLC coating was also applied to the
first ring. To reduce lateral forces and ensure reliable transmission of the enormous
gas forces from the piston to the crankshaft, the connecting rod was modified compared
with the previous model.
A computer-optimized design of piston and connecting rod in combination with a
short compression height permits the components to be designed with an optimum
power-to-weight ratio. The low mass forces bring about a reduction in the crank
drive loads and enhance the smooth running of the engine.
To ensure the load capacity of the new 911 Turbo engines as well as the higher
power and torque values, the pistons were strengthened and adapted. This made it
possible to increase the maximum peak pressures by more than 10% and considerably
improve internal efficiency. As a result, it was also possible to achieve the
increases in power compared with the previous models at comparable boost pressures
using new thermodynamic tuning (e.g. valve timing and timing angle)
Great information. Much needed. This re-assures me for the long haul. I am intending to keep mine for a while, though stock for now, it gives me great confidence that by the time I feel the need for something "more" I can start modifying it, smartly, and keep it even longer.
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