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Rebuilding a 968 engine

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Old 12-30-2010, 10:42 AM
  #46  
Lemming
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Stock engine with a chip and headers. It was not a balanced and blueprinted engine, which I think is necessary to run at those RPM's under race conditions.
Old 12-30-2010, 05:07 PM
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JDS968
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Originally Posted by FRporscheman
Wow!
^
^
Old 12-30-2010, 10:50 PM
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Originally Posted by Lemming
Stock engine with a chip and headers. It was not a balanced and blueprinted engine, which I think is necessary to run at those RPM's under race conditions.
Ahhhh, thanks for the clarification.
Old 12-31-2010, 08:44 PM
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Originally Posted by Lemming
That's what I got for spinning a non-modified 3L engine at greater than 7,000 rpms for long periods!
Really??
Tell that to the guy that claims 7800rpm revs don't hurt our engines, lol.
Old 12-31-2010, 08:57 PM
  #50  
Lemming
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Originally Posted by 968TurboS
Really??
Tell that to the guy that claims 7800rpm revs don't hurt our engines, lol.
I learned that the hard way, two engines in one summer (broken #4 rod, shown above, and spun a rod bearing). Luckily I caught the 2nd before any real damage.
Old 01-01-2011, 05:24 AM
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So what's the generally-accepted figure for maximum safe sustained RPM for a non-blueprinted non-balanced 968 motor? 7000?
Old 01-01-2011, 12:17 PM
  #52  
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Originally Posted by JDS968
So what's the generally-accepted figure for maximum safe sustained RPM for a non-blueprinted non-balanced 968 motor? 7000?
After my two engine issues, I decided to go down to 6500 and ran a full year and one half with no issues at all. Now that I have a blower, I will not be going above 6500 and really need to find an aftermarket rev limiter to make sure.
Old 01-01-2011, 03:38 PM
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I'm not trying to sound snooty at all here, but I would think the obvious maximum rpm for a stock 968 engine would be the factory redline.
Old 01-01-2011, 05:02 PM
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It was 60+ degrees here in the 'ham yesterday, so I took the time to seal up all the openings and took the engine out into the driveway to be cleaned.
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Old 01-01-2011, 05:58 PM
  #55  
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Sounds like you need either standalone engine management or a custom built 968 DME chip that will work for your specific engines setup?

If the later than use a known high quality chip tuner that can support or stand bye his work?

Buy a set of new Porsche springs that go inside the Oil Pressure Relief Valve to ensure great pressure readings!
Old 01-04-2011, 05:19 PM
  #56  
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A MSD ignition box will allow you to adjust the rev limit as well as provide better spark, which is not a bad plus with a forced induction motor
Old 01-04-2011, 10:41 PM
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Originally Posted by 968workaholic
A MSD ignition box will allow you to adjust the rev limit as well as provide better spark, which is not a bad plus with a forced induction motor
Seems like a complete standalone ECU such as a Motec would be worth it. At that point, is an MSD box completely redundant, or does it still offer useful additional functionality?
Old 01-05-2011, 01:14 PM
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Its not really necessary if you have a standalone system, but the price tag of a Motec system is pretty steep compared to around $200 for a MSD box. The factory ECU works really well even on highly modified motors. The most power I have seen out of a motor running a factory ECU was 315 at the flywheel and it didn't have any problems tuning.
Old 01-05-2011, 07:09 PM
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Originally Posted by 968workaholic
Its not really necessary if you have a standalone system, but the price tag of a Motec system is pretty steep compared to around $200 for a MSD box. The factory ECU works really well even on highly modified motors. The most power I have seen out of a motor running a factory ECU was 315 at the flywheel and it didn't have any problems tuning.
Interesting. Was this FI or NA?
Old 01-05-2011, 07:44 PM
  #60  
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