Incorrect specs? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 05-28-2003, 07:11 PM   #1
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Default Incorrect specs?

Been looking around and what I've read suggests the L27 came with 220 ft/lb torque, not 225.
Even so, I'm looking for some specs I can never find a solid answer on...for example:

Did the L27 come with a compression ratio of 8.5:1 or 9.0:1? My manual (I'll have to recheck CHILTON as well) says 8.5:1 until 1995, then itr was 9.0:1 for NA 3800'*.

Also, whats the gearing for the L27? Let me know if I'm correct:
1st = 2.97
2nd = 1.57
3rd = 1.00
4th = 0.70
Final drive ratio = 3.06:1

Last but not least...weight of a 94 SSE is 3587?
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Old 05-28-2003, 07:24 PM   #2
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I actually looked some of this info up a couple days ago. I know I read that the torque IS 225lb/ft and the weight you said is what I found also.
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Old 05-29-2003, 12:46 AM   #3
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BTW! The Engine has nothing to do with the Transmission gearing!
Depending on what transmission you have & model of Bonneville (SE/SSE/SSEi), depends on what final drive option you got.

Pontiac Bonneville Transmission Final Drive Ratios:

1987 > ME9 > 2.73R
1988 > ME9 > 2.73R / 2.84R
1989 > ME9 > 2.84R
1990 > ME9 > 2.84R
1991 > ME9 > 2.84R
1992 > M13 > 3.06R / 2.97R / 2.84R
1993 > M13 > 3.06R / 2.97R / 2.84R
1994 > M13 > 3.06R / 2.97R / 2.84R
1995 > M13 > 3.06R / 2.97R / 2.84R
1996 > M13 > 3.06R / 2.84R / 2.93R
1997 > M13 > 3.06R / 2.84R & MN7 > 2.93R
1998 > M15 > ?.??R & MN3 > 2.86R & MN7 > 2.93R
1999 > M15 > ?.??R & MN3 > 2.86R & MN7 > 2.93R
2000 > MN3 > 2.86R / 3.05R & MN7 > 2.93R
2001 > MN3 > 2.86R / 3.05R & MN7 > 2.93R
2002 > MN3 > 2.86R / 3.05R & MN7 > 2.93R
2003 > MN3 > 2.86R / 3.05R & MN7 > 2.93R
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