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YOUR RESEARCHEngine replacement displacement for '99 996
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Replace 3.4 engine
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Paul 996 recently replaced a 3.4 engine with a 3.6 engine, so his thread my help answer your questions.
Leading evidence: 'Replace 3.4 engine' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace 3.4 engine' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion
My 1999 car recently had this done using a different approach which retains as much of the original car's equipment as possible (DME, harnesses, etc.)
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You would need a DME for 3.6 since that engine has VarioCam Plus (DME 7.8). You would also need to make some changes in the fuel system since your car does not have the returnless fuel system of the 3.6.
Not to difficult but not really plug 'n play.
I posted this link in another thread were you asked the question. Paul 996 recently replaced a 3.4 engine with a 3.6 engine, so his thread my help answer your questions.
Replaced a 3.4 engine with a 3.6 engine
Thanks, guys. Oh you have no idea how much I hate this.
OK! About 5-6 years ago when 996 engines were launching left and right, the argument was made that the 993's 3.6 was far more durable for whatever reason. This 3.6 water cooled we're talking about is NOT the same 3.6 aircooled as far as the innards go, correct? Or is it?
Whiz..
Loren is spot on. The way he describes is one of the more "factory like" methods of how to put a newer 3.6L into the earlier 3.4L based 996s. My 1999 car recently had this done using a different approach which retains as much of the original car's equipment as possible (DME, harnesses, etc.)
Loren's way requires updating the car with newer components to match the newer engine... ECU, Dash, fuel system, new harness. A lot more surgery but a lot more "stock".
FWIW: you can also upgrade your car to a 3.8L from the 997S... The shop that did my car has done a few of those in Boxsters.
Lastly: the 3.6 of the 993 and 964 era are not the same as the newer 3.6 of the 996 and 997 era. The 996 3.6 is just an upgraded 3.4 with lots of updates of things that porsche found to have gone wrong.
More head banging. I need to get this monkey off my back. Can you all please hook me up with some info source on how much a 996 without a motor can sell for? Looking at options here; put replacement motor and sell at submarket value, or sell car sans motor. Either way, I am getting rid of this one. Thanks, everyone, again for your input.
Oh BTW, the car has an aerokit from Carnewal without the rear wing, ROW suspension, no wrecks. Panels in very good shape, need maybe a 2-300 dollar job at Dent Wizard and it'll be good for near concours. Road chips from the dang DE's at CMP (like sand blasting). I'm melting.........
Whiz..
Plan on spending 11-14k at a dealer for a remanufactured 3.4 from porsche with a 2yr warranty. This really vaires based on your local labor rate and if your 3.4 is considered acceptable as a core towards your new 3.4.
PM me if you any questions. I also believe that there is another active thread on 996 value's with blown engine.
IMHO, it is not in your interest to consider upgrading to a 3.6/3.8 unless you plan to keep the car for a while and make it something special. Otherwise just have a 3.4 put in or sell it and eat the loss. I went through all these choices myself already.
best of luck to ya.
-Paul
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