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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 11-25-2011, 05:01 PM   #1
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Compression Numbers

Engine: B235R, 2000 9-3 Viggen
Miles: ~600 on rebuild
History: one oil change, still on regular dyno oil for break in
Internal Mods: JE Pistons, 1st over
Test: dry, other plugs removed

1: 181
2: 187
3: 185
4: 190
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First T7 19T turbo setup. First T7 Deka 80lb. injector setup.

Last edited by Drew in Houston; 11-27-2011 at 06:08 PM.
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Old 11-26-2011, 07:11 AM   #2
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doing this next chance i get at the shop... i feel like cyl 2 in my car is gonna be low
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Old 11-27-2011, 06:00 AM   #3
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Found an old note with more numbers

Engine: B205R, 2000 9-3 SE
Miles: unknown, bought car with transplanted engine, bad instal didn't run right. 87k on body, engine lower, suspect 40-60k(?)
History: unknown
Internal Mods: none, stock engine
Test: Dry, other plugs removed

1: 185
2: 185
3: 185
4: 175
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First T7 19T turbo setup. First T7 Deka 80lb. injector setup.
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Old 11-27-2011, 06:05 AM   #4
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Engine: B205R, 2001 9-3 SE
Miles: 189k
History: this was my modified 19T car, purchased with 60k original miles. After 129k hard miles, most over 300whp, finally cracked #4 piston at 26psi, between ring lands. Always ran synthetic
Internal Mods: none, stock
Test: Dry, other plugs removed

Teardown/Plans: bearings were in great shape, cross hatching on walls very visible. Out at machine shop currently. Wear wasn't enough to catch your fingernail on it, probably could put stock pistons back in it, going 1st over though since it's going to be balanced.

1: 150
2: 140
3: 160
4: 90
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First T7 19T turbo setup. First T7 Deka 80lb. injector setup.

Last edited by Drew in Houston; 11-27-2011 at 06:14 AM.
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Old 11-27-2011, 06:10 AM   #5
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doing this next chance i get at the shop... i feel like cyl 2 in my car is gonna be low
Yeah for sure, post up when you can. It'd be great if we could get a lot of info together, after rebuilds, mid-life, tuned...

I tend to write stuff on scratch paper leave it in the garage and then eventually lose it...pretty worthless long term.
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First T7 19T turbo setup. First T7 Deka 80lb. injector setup.

Last edited by Drew in Houston; 11-27-2011 at 06:13 AM.
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Old 11-27-2011, 07:06 AM   #6
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As soon as i find a compression gauge i trust!
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I heard Tom Had a 2 pump dump on his injector duty cycle....

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Old 11-27-2011, 07:24 AM   #7
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ill be doing one as well prob next week. im not expecting any numbers though lol
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Old 11-27-2011, 07:54 AM   #8
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Quote:
Originally Posted by Drew in Houston View Post
Yeah for sure, post up when you can. It'd be great if we could get a lot of info together, after rebuilds, mid-life, tuned...

I tend to write stuff on scratch paper leave it in the garage and then eventually lose it...pretty worthless long term.
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ill be doing one as well prob next week. im not expecting any numbers though lol
mine will probly show the affects of leaving water in the cylinder for days time after an hg blowout
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Old 11-27-2011, 05:05 PM   #9
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Got one running 120s across the board, any thoughts?
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Old 11-27-2011, 05:43 PM   #10
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normal wear engine if they are all equal
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Old 11-27-2011, 05:51 PM   #11
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Got one running 120s across the board, any thoughts?
Could be an off guage, or an older motor. or both, Usally anything over 100 will run. a fresh strong motor is between 185-205psi.

Last time i checked my old wagon (yours now) with around 245k on it, it got a solid 175 +/- 5 across the board..

Could just be the guage, Also are you taking comp reading at WOT, if the throttle flap isnt open it will get alot less air to compress.

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Old 11-27-2011, 05:54 PM   #12
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How about cylinder 1 with 120psi and the rest in the 150-155 range.. Oil is milky so it needs a head gasket but am wondering if it's possible for the low reading in one cylinder could be due to a HG when usually its cyl 2&3 that have low readings
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Old 11-27-2011, 05:56 PM   #13
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Also are you taking comp reading at WOT, if the throttle flap isnt open it will get alot less air to compress.

Mike d
Good point. Mine were all with the throttle closed.
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First T7 19T turbo setup. First T7 Deka 80lb. injector setup.
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Old 11-28-2011, 10:24 AM   #14
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I always compression test with throttle plate closed..... I'm consistant about it, as im sure most of you are. I'll have to do a Back to back test to see the difference between WOT and closed throttle.
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Old 11-28-2011, 10:25 AM   #15
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Its an older motor with new headgasket. Cranks but won't run. Changed out CPS, etc.

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Could be an off guage, or an older motor. or both, Usally anything over 100 will run. a fresh strong motor is between 185-205psi.

Last time i checked my old wagon (yours now) with around 245k on it, it got a solid 175 +/- 5 across the board..

Could just be the guage, Also are you taking comp reading at WOT, if the throttle flap isnt open it will get alot less air to compress.

Mike d
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Old 11-28-2011, 01:30 PM   #16
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I always compression test with throttle plate closed..... I'm consistant about it, as im sure most of you are. I'll have to do a Back to back test to see the difference between WOT and closed throttle.
Motor depending (single cyl/ITB cars have a bigger difference) also if your doing the test with the plugs still in it matters more,,,

with all the plugs out, some air is alowed back into the intake mani via the other cyls open intake valves
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Old 11-30-2011, 08:33 AM   #17
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Engine: B204R
Miles: ~4k
History: 2 blown HG
Internal Mods: JE Pistons, 1st over
Test: dry, other plugs removed, WOT

Cyl 1: 170
Cyl 2: 165
Cyl 3: 175
Cyl 4: 195

So this is the affects of water sitting in your cylinders
gonna recheck it again to confirm but that was a quick test between classes
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Old 12-23-2011, 02:28 PM   #18
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Do you guys let the motor crank the same amount for each cylinder? I thought that was the right way to do it, but then I heard you should crank each cylinder until you reach max compression for each one...can someone clarify?
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Old 12-23-2011, 06:42 PM   #19
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Do you guys let the motor crank the same amount for each cylinder? I thought that was the right way to do it, but then I heard you should crank each cylinder until you reach max compression for each one...can someone clarify?
just keep cranking until the needle maxes out
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Old 12-24-2011, 03:03 AM   #20
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I done mine.
Not wot, All plugs out

97 mod 188,000 klm's

In PSI
1&2 - 190
3 -185
4 -180
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