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dirtybird91
11-27-2004, 12:29 AM
What is the stock compression of our 3.8 SC engine compared to the stock compression of a 1987 3.8 Buick GN Turbo engine??? :confused: :confused: :confused:

89importeater
11-27-2004, 11:40 AM
from what i found the sc has a cr of 8.2:1 while the GN had a cr of 8.0:1.

quick35th
11-27-2004, 01:41 PM
I thought that the SC compression was 8.5.1 but I am not sure.

Shane

dirtybird91
11-27-2004, 02:16 PM
I found out that the Buick GN is definately 7:8:1 compression ratio, but nobody seems to be certain about the SC. I know it sounds funny why I want to know, but I am doing a little homework.
Thanks! :cool:

dirtybird91
11-27-2004, 05:05 PM
Thunderbird SC: 8.2:1
1987 Buick GN: 7.8:1

Does anyone know which has the advantage if you factor in a power adder of equal boost???? :confused:

Kevin Varnes
11-27-2004, 05:13 PM
Early SC's were 8.2:1
94/95 SC's were 8.5:1

dirtybird91
11-27-2004, 05:28 PM
Early SC's were 8.2:1
94/95 SC's were 8.5:1
Thanks Kevin! :cool:

Mustang IIowner
11-27-2004, 06:24 PM
Does anyone know which has the advantage if you factor in a power adder of equal boost???? :confused:


The higher compression one would make more power (everything else being equal) But it will have detonation B4 the lower comp engine would.

dirtybird91
11-27-2004, 06:27 PM
The higher compression one would make more power (everything else being equal) But it will have detonation B4 the lower comp engine would.

I see! But with boost factored in things should have the opposite affect, right? :confused:

quick35th
11-28-2004, 02:00 PM
I see! But with boost factored in things should have the opposite affect, right? :confused:

No. Mustang IIowner is right. The one with lower compression can safely make more boost before is starts to detonate compared to the higher compression one that makes less boost before it detonates.

Shane