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-   -   compression ratio (http://986forum.com/forums/boxster-general-discussions/83486-compression-ratio.html)

Race 06-04-2023 08:42 AM
compression ratio
 
Anyone know what the dynamic compression ratio is on 2001 3.2 986?

JFP in PA 06-04-2023 11:18 AM
Quote:
Originally Posted by Race (Post 653714)
Anyone know what the dynamic compression ratio is on 2001 3.2 986?
The advertised compression ratio is 11.0: 1

Race 06-04-2023 12:59 PM
Yes 11.0 to 1 is the static compression ratio. I am trying to figure the dynamic, that should be much lower.

JFP in PA 06-04-2023 01:41 PM
Quote:
Originally Posted by Race (Post 653721)
Yes 11.0 to 1 is the static compression ratio. I am trying to figure the dynamic, that should be much lower.
DCR in the range of 8-8.5:1

Race 06-04-2023 05:15 PM
Perfect thank you I am working on a super charger install and trying to determine if I am going to run into any issues at 6 to 7 psi boost.

JFP in PA 06-05-2023 05:49 AM
Just remember that the DCR moves on these engines within a range because of the Vario Cam functions, and both turbos and blowers are a bad idea for these engines...................

Gilles 06-05-2023 12:14 PM
Quote:
Originally Posted by JFP in PA (Post 653734)
Just remember that the DCR moves on these engines within a range because of the Vario Cam functions, and both turbos and blowers are a bad idea for these engines...................
Specially if you are leaving the bottom end stock (conrods & conrod bolts)

JFP in PA 06-05-2023 12:24 PM
Quote:
Originally Posted by Gilles (Post 653742)
Specially if you are leaving the bottom end stock (conrods & conrod bolts)
Or the pistons, and especially the piston rings. You do not just slap a blower or turbo (or nitrous for that matter) on an engine designed to run normally aspirated and expect it to live for very long....

Bush Pilot 06-05-2023 02:16 PM
Quote:
Originally Posted by JFP in PA (Post 653743)
Or the pistons, and especially the piston rings. You do not just slap a blower or turbo (or nitrous for that matter) on an engine designed to run normally aspirated and expect it to live for very long....
Completely agree.


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