996 Turbo engine builders?
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Joined: Mar 2009
Posts: 334
From: Northern Virginia
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Yes, ditto on the lifter part number... I'm in the middle of my build and am still undecided on the lifters. As far as I know, mine were in good shape. Does it make sense to replace them anyways???
Again, the 'new' part number for both would be great!
thanks
Again, the 'new' part number for both would be great!
thanks
Registered User
Joined: Apr 2010
Posts: 284
From: san francisco
Rep Power: 34
There arent many that have had moving failures, more like mine that fall apart when doing work, if so, hopefully someone will speak up.
The newest part number for an intake lifter is 996-105-255-25 the exhaust is 996-105-041-72. These newest numbers are also the same as used in the 997 turbo.
//Anders
The newest part number for an intake lifter is 996-105-255-25 the exhaust is 996-105-041-72. These newest numbers are also the same as used in the 997 turbo.
//Anders
copied the wrong items..
99610504173 Exhaust Lifter $650-700
99610525525 Intake Lifters $1350-1400
Couldn't tell you why there is the difference
99610504173 Exhaust Lifter $650-700
99610525525 Intake Lifters $1350-1400
Couldn't tell you why there is the difference
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Joined: Oct 2005
Posts: 5,522
From: NW
Rep Power: 275
Havent posted for a while, figured I was due for an update... I don't remember where I left off but dropped my turbo off at Protomotive before leaving for Afghanistan, Todd , Cyn and company were awesome hosts and very patient showing me and my buddy Pete around their facilities.
During the tear down to replace the rods, we found a few problems, the lifters literally fell apart when they were pulled out.. we were aware of the issues with the earlier years and had planned to use the new part number (there are a few posts about the early 996tt lifters). Someone also overtorqued the camhousing bolts and pulled some threads... I'll post some pics later but why the hell would someone overtorque the cam housing?
Later on during the teardown the exhaust valves were in bad shape, they were so pitted that they would be unable to be dressed up and would probly overheat with the higher power I am looking for, they and the guides will be replaced.
My oil pump also had some stiffness and the gears looked like something went through it at some time, I'll replace it with a GT3 model, I am told not much difference but an additional pickup.
I also planned on cleaning up the heads a little bit, new Alpha turbos, the infamous protomotive 5" intecoolers, intake and exhaust, the 997tt intake manifold, e85 fuel system and a few other go faster tricks that will get us somewhere between 800-1000hp.
We should be doing the build up in the near future and will be posting more as it happens. Cant wait to drive the Proto-monster when I am back home sometime this summer :-)
During the tear down to replace the rods, we found a few problems, the lifters literally fell apart when they were pulled out.. we were aware of the issues with the earlier years and had planned to use the new part number (there are a few posts about the early 996tt lifters). Someone also overtorqued the camhousing bolts and pulled some threads... I'll post some pics later but why the hell would someone overtorque the cam housing?
Later on during the teardown the exhaust valves were in bad shape, they were so pitted that they would be unable to be dressed up and would probly overheat with the higher power I am looking for, they and the guides will be replaced.
My oil pump also had some stiffness and the gears looked like something went through it at some time, I'll replace it with a GT3 model, I am told not much difference but an additional pickup.
I also planned on cleaning up the heads a little bit, new Alpha turbos, the infamous protomotive 5" intecoolers, intake and exhaust, the 997tt intake manifold, e85 fuel system and a few other go faster tricks that will get us somewhere between 800-1000hp.
We should be doing the build up in the near future and will be posting more as it happens. Cant wait to drive the Proto-monster when I am back home sometime this summer :-)
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Joined: Apr 2008
Posts: 5,214
From: Colorado
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I hope they are made of forged Titanium
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Joined: Jun 2005
Posts: 8,509
From: Virginia, USA
Rep Power: 789
Mine failed in my GT2 at only 8K miles. If you are already in the motor, definitely replace them.
Porsche tax, you know how it is. The car had 10 hard years out of them, hard to ask for more considering at what power levels we're at.
Divexx, yep, I was definitely aware of the issue and was on the replace list, interestingly when Todd was disassembling the heads he made a comment about them "falling apart in his hands", not that Porsche is infallible, but I'm thinking most other makes this would have been a catastrophic moving failure.
Divexx, yep, I was definitely aware of the issue and was on the replace list, interestingly when Todd was disassembling the heads he made a comment about them "falling apart in his hands", not that Porsche is infallible, but I'm thinking most other makes this would have been a catastrophic moving failure.
Registered User
Joined: Jun 2005
Posts: 8,509
From: Virginia, USA
Rep Power: 789
I posted this thread a while back: https://www.6speedonline.com/forums/...r-lifters.html