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996 Engine Evolution

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What are the actual differences between the 3.4, 3.6 and 40th Anniversary 3.6 (Not concerned with GT3 and Turbo models)? Does anyone have all of the engine specs and details?

This is what I have found to date on basic specs

1999 3.4 = 296 hp

00-01 3.4 = 300 hp

02-05 3.6 = 320 hp

04 40th 3.6 = 340(5) hp

Additionally, many have noted that the 40th headers are different. Is this because of the heads?

Does anyone have all of the engine specifications; from bore and stroke to camshaft lift and duration?



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Here is some more information discovered.

3.6 has a longer stroke and the same bore as the 3.4.

3.4 Non-Egas uses Motronic 5.2 Non Egas models include those without PSM from MY98-00.

3.4 Egas uses Motronic 7.2 (All C4s and PSM cars) (7.2 cars also have 300hp vs 296hp which is a skeptical issue because this would mean the MY99 C4s have more power than the MY99 C2s)

3.6 uses Motronic 7.8 (same version for turbo) (Motronic 7.8 is more efficient than the *.2 versions mentioned above meaning the larger displacement is better on the environment and still makes bigger hp.)

It looks like the egress valves might be larger on the MY02-05 3.6 but I cannot find supporting information at this time.

The 40th anniversary car has major headwork, oil baffling, a different intake, headers and a remapped Motronic 7.8. (Loren, I hope this is not too specific)

For you Boxster guys the 3.4 Non-Egas uses the same computer as the 2.5L cars but a different mapping obviously.

The Boxster 2.7 and 3.2 uses the Motronic 7.2 much like the 3.4 Egas no-shocker to you Egas guys.

Please correct me if I am wrong on these claims.



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3.4 Non-Egas uses Motronic 5.2 Non Egas models include those without PSM from MY98-00.

Optionally these cars could have TC (Traction Control ) and LSD which was a forerunner to PSM with ABD.

C2's of MY98-99 were all non egas.

C4's of MY98-99 were all egas.

MY00 - on - all were egas.

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