Go Back   986 Forum - The Community for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Boxster General Discussions

Post Reply
 
LinkBack Thread Tools Display Modes
Old 09-25-2008, 09:20 PM   #1
Registered User
 
Join Date: Jul 2006
Location: San Jose California
Posts: 220
Is the 3.4 and 3.6 based of the 3.2?

Hey guys so Im having an argument with my dad about the fact that the 3.4 and 3.6( GT3) are not based of the 3.2. He thinks that they are just the 3.2 made bigger with different components. Can anyone explain this to me or show me links explaining if the 3.4 and 3.6 are or not based of the 3.2.

thanks
Stunin_Stud is offline   Reply With Quote
Old 09-25-2008, 09:36 PM   #2
Track rat
 
Topless's Avatar
 
Join Date: Nov 2006
Location: Southern ID
Posts: 3,701
Garage
Maybe just some clarification is needed. The Boxster and Carrera share the M96 block which is available in 2.7, 3.2, 3.4, 3.6, and 3.8L. The GT3 and Twin Turbo share a 3.6L based on the old 964 block. Two very different engine designs. No IMS issues on the GT3 motor.
__________________
2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
Topless is offline   Reply With Quote
Old 09-26-2008, 05:44 AM   #3
Porscheectomy
 
Join Date: Mar 2006
Location: Seattle Area
Posts: 3,011
Quote:
Originally Posted by Topless
The GT3 and Twin Turbo share a 3.6L based on the old 964 block.
The engine on the TT, GT3, GT2, GT1 race car and 959 are all related and date back to before the 964. They are actually evolutions of a design that started with the 904 and 962 in the mid-60s.

I think that line ends next year though, I believe I say that Porsche announced all the engines in the new 997s will be based on the same block.

All the other 986, 987, 996, and 997 engines from 3.2-3.8 liters share the same block with different cylinder bores. The heads from different displacements and different years vary greatly.

Last edited by blue2000s; 09-26-2008 at 05:48 AM.
blue2000s is offline   Reply With Quote
Old 09-26-2008, 08:17 AM   #4
Registered User
 
Join Date: Sep 2004
Location: Atlanta
Posts: 1,820
here's how the M96 variants (non GT2, GT3 or Turbo) are pieced together (if i remember correctly):

the 2.5L and 2.7L engines share castings. the heads are identical and the bores are identical, but the stroke is slightly longer on the 2.7L (different crankshaft).

the 3.2L and 3.4L engines share castings and heads as well. i believe they also share cranks, but that their bores are different.

the 3.6L and 3.8L share castings and heads; the 3.8L has a larger bore.

The GT2, GT3 and Turbo engines are all more or less the same (and totally unrelated to the M96); the valvetrain on the NA is a bit different than the one on the turbo variants i think; the compression ratios are obviously different as well.
__________________
insite
'99 Boxster
3.4L Conversion

http://i156.photobucket.com/albums/t...1/KMTGPR-1.jpg
insite is offline   Reply With Quote
Old 09-26-2008, 06:43 PM   #5
Porsche "Purist"
 
Paul's Avatar
 
Join Date: Aug 2003
Location: Wisconsin
Posts: 2,123
Garage
All I can say for sure is a 2002 996 3.6 bolts right up to a 1998 5 speed tranny in a 1998 Boxster.
__________________
1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster original owner. I installed used motor at 89k.
1987 924S. 2002 996TT. PST-2
Owned and repaired Porsches since 1974. Porsche: It's not driving, it's therapy.
Paul is offline   Reply With Quote
Old 09-26-2008, 07:00 PM   #6
Registered User
 
Join Date: Sep 2004
Location: Atlanta
Posts: 1,820
Quote:
Originally Posted by Paul
All I can say for sure is a 2002 996 3.6 bolts right up to a 1998 5 speed tranny in a 1998 Boxster.
correct; all of the M96 variants have the same bell housing pattern. the GT2, 3 and turbo all mate up to the split case trannys.
__________________
insite
'99 Boxster
3.4L Conversion

http://i156.photobucket.com/albums/t...1/KMTGPR-1.jpg
insite is offline   Reply With Quote
Post Reply



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 05:44 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2025 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page