3100 compression - 60DegreeV6.com

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95Grand-Am

Join Date: May 2007

Posts: 268
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#1

3100 compression

08-16-2009, 08:07 PM

What should a good fresh 3100 have for cranking compression? Does GM have any specs for it?
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robertisaar

W-Body for Life!

Join Date: May 2007

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#2

08-16-2009, 09:01 PM

normal would be around 150psi

the recommended minimum is 100psi, with no more than 30(?)% difference between the highest and lowest cylinder.

1995 Monte Carlo LS 3100, 4T60E...for now, future plans include driving it until the wheels fall off!
Latest nAst1 files here!
Need a wiring diagram for any GM car or truck from 82-06(and 07-08 cars)? PM me!
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95Grand-Am

Join Date: May 2007

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#3

08-16-2009, 09:27 PM

Could a stock 3100 have 200psi?
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robertisaar

W-Body for Life!

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#4

08-16-2009, 09:37 PM

depending on how well the rings and valves are sealing and how much carbon has built up inside the chamber, yes.

1995 Monte Carlo LS 3100, 4T60E...for now, future plans include driving it until the wheels fall off!
Latest nAst1 files here!
Need a wiring diagram for any GM car or truck from 82-06(and 07-08 cars)? PM me!
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Azrael

Accelerating uphill in OD

Join Date: Apr 2005

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#5

08-16-2009, 10:57 PM

With 190,000km, mine was between 170 to 185 psi. Warmish and no oil added.

1995 Grand Am SE
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