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Performance Modifications for the 9-5 This forum contains PERFORMANCE related Q&A's for the 9-5. This may also include suspension.

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Thread: t7 motors; which piston usually burns, first? Reply to Thread
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Topic Review (Newest First)
12-05-2010 06:42 AM
jouniu CP Custom made pistons...





11-26-2010 06:10 PM
GenuineSaab
Quote:
Originally Posted by mike d View Post
how about the earlyer style rods?
Not sure. We ran the old B204s a long time at high rpm. Never looked at the cap mating surface for fretting etc.
The earlier style with the studs instead of the fractured surface to keep the caps lined up might make the fasteners do more work. Small difference most likely. The weight of the pistons, rods combined with stroke and acceleration differences would make much more impact.
11-25-2010 03:35 PM
mike d how about the earlyer style rods?
11-24-2010 07:07 AM
GenuineSaab
Quote:
Originally Posted by mike d View Post
our of curisoty, how far have people taken the T7 rods? they look pretty beefy, and Ive barely every heard of them popping?
Stock B205 Rods. New style -01 up. 8900 Rev limit.
667whp at 7k http://trolltuner.com/temp/toomuch-20100918-131857.gif
620 at 8500 http://genuinesaab.com/gallery/album...s/IMG_0010.jpg

Long term durability may not be there but so far held far more dyno tuning and drag strip passes than expected. Sort of hard to shear the axles on the launch. RPM heads for the moon. Haven't decided if the super light flywheel helps or hurts in that situation.

Piston noise is mostly in setting the bore clearance when machining the block.
11-23-2010 10:41 PM
lekonna
Quote:
Originally Posted by mike d View Post
our of curisoty, how far have people taken the T7 rods? they look pretty beefy, and Ive barely every heard of them popping?
i've had no problems with the t7 rods so far around 500hp
11-21-2010 05:22 PM
mike d our of curisoty, how far have people taken the T7 rods? they look pretty beefy, and Ive barely every heard of them popping?
11-20-2010 08:26 PM
JZW
Quote:
Originally Posted by saabkid37 View Post
looks like a classic t7 failure to me.
I would agree, looks just like my viggen did and other t7 piston failures I have seen. T7 pistons are on the weak side, no doubt about it...
11-20-2010 08:25 PM
JZW I like the woessner, they are high quality and I get no piston slap on cold mornings, defintely less than the Je pistons I was running before and the woessner pistons do have a coating on the skirts, just like je.

The woessner pistons are a little bit lighter too, I have been very happy with them so far and have them in my Viggen and my 700bhp race car.

John
11-20-2010 06:11 AM
Dudethe9-5isfast I have the ceramic coated JEs in my daily driver for 30K miles at this point without any piston slap etc at startup
11-19-2010 05:56 PM
stromer Looks nice

Mine was #3, for reference. Luckily it happened shortly before my test drive and the Saab dealer rebuilt the engine.
11-19-2010 02:10 PM
g96nt I'm not going to have this car forever, And I'm trying to keep it as civil as I can (for resale) Trying to explain to anyone why the motor makes so much noise @ startup isn't what I want to be doing.
I'd perfer to buy the 4032's which have less expansion/contraction difference, and worry a lot less about warm-ups, and blowby.

JE aren't junk, by any means, but they're just not the most D/D-friendly.
11-19-2010 12:34 PM
Dudethe9-5isfast Just curious as to why you changed your mind from JE to Wossners ?
11-15-2010 02:49 PM
g96nt
Quote:
Originally Posted by Saabeh View Post
Nice! In the pics, the crank looks scored on number 3 I think? Like spun main bearing? Might just be stains.
are you talking about the 2nd from left? that's the rod bearing, still on the crank. Everything's fine in there. just needs a hone, and we're off!
11-15-2010 01:37 PM
saabkid37 looks like a classic t7 failure to me.



11-15-2010 01:07 PM
Raven18940 Wow, boom.
11-15-2010 12:48 PM
g96nt no scoring. they're all perfectly fine.
11-15-2010 12:12 PM
Saabeh Nice! In the pics, the crank looks scored on number 3 I think? Like spun main bearing? Might just be stains.
11-15-2010 10:34 AM
g96nt well, I finally got it apart today.
#1 is cracked. it's not in pieces, but it's cracked.
Also, the lower compression ring is cracked, and fell out when I popped it out of the motor.

The good news was that there was zero scoring, the rod bearings looked good, and the oil pan/pickup were pretty clean. (aside from some RTV scraps)

so.. a stone-hone, and wossners are the plan. I may have it done in '10, but I doubt it.
having the 9-3 means I donlt have to rush.

a couple crappy pictures:






09-19-2010 05:12 PM
g96nt the head was planed, yeah.....
the ARPs get tightened to 105lb/ft
the only thing is that I didn't use oil or the moly lube.
I'll take a look @ the head with a straight-edge when the head's off again.
09-19-2010 04:33 PM
mike d What did you torque the ARPs too? and did you have the head decked before installing??

its an end cyl (either 4 or 1) to toss an HG, most the time ive delt with blown ones those are the two that kick out first

however, this is c900/9000 experience talking, i think cyl 1 (or is it 4, its the one closest to the dizzy) usually blew due to the intake mani design. 9-5s are much more symmetrical
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