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Old 04-14-2004, 05:40 PM   #1
Tony
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2005 9-2X Aero
Desert Silver

Question If a timing belt slipped a notch or two would I be running advanced or retarded?

...or am I retard? I'm thinking it would be advanced. Can anyone confirm this?

Reason I ask, take a look at my t-belt (15k before scheduled maintenence interval):


I don't have a good shot of the teeth side but they look like it might've skiped a tooth or two and that would explain the dip in power and full lean condition at 4k rpm I was experiencing.

A couple more pics: http://www.pbase.com/bigfork/rs_pix

Tony
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Last edited by Tony; 04-14-2004 at 07:58 PM.
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Old 04-14-2004, 07:09 PM   #2
Legacy777
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that thing is toast.......

I doubt the whole belt skipped a tooth on the crank & cams......so I think it'd just be running screwed up.......or one side running worse then the other.
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Old 04-14-2004, 08:07 PM   #3
Ruff
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Wow... So you have about 90k miles on your car? What power mods do you have on the car and what is your driving style/any racing?
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Old 04-14-2004, 08:20 PM   #4
Tony
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Quote:
Originally posted by Ruff
Wow... So you have about 90k miles on your car? What power mods do you have on the car and what is your driving style/any racing?
The chassis has 115k, the motor 85k (cracked a head and SOA wouldn't warranty it, maybe I should've removed the 4-points and helmet when I brought it in ). I put the new (to me) engine in when it had 50k on it so only the last 35k "gentle" miles were mine.

Driving style: Tough to say but I drive it pretty hard but I don't think I abuse it too bad. Regular oil changes with Mobil 1 and all scheduled maintenance. The bad: I've been autoxing this car... a lot. Not as much recently but I'm sure it's seen 500+ autox runs and 5 track days. I think if any damage was done to the t-belt it would be from bouncing off the rev-limiter while autoxing. At max revs I doubt that belt like to be accelerated and decelerated several times a second. Also my driving style probably keeps the revs higher than say an EJ25 in an Outback wagon so 85k in my car probably means a lot more revolutions than 85k in a typical EJ25 in an Outback or the like.

Mods: Not much. I/H/E is about it. If I'm making more than 5% more power than stock I'd be very surprised. Everything else is suspension changes.

Tony
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Old 04-15-2004, 06:10 AM   #5
KCramer
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i thought my belt looked bad...geesus
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Old 04-15-2004, 09:13 AM   #6
Section 8
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It would depend when the slip occured. Your example of bouncing off of the rev limiter, shows the two possibilities of slipage. Either when the crank was accelerating or decelerating. If it slipped while accelerating it would be retarded, if it slipped when decelerating it would be advanced.

THe other poster makes a good point that likely only one cam sproket is off.

cheeRS,

Greg
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Old 04-15-2004, 09:27 AM   #7
Tony
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Quote:
Originally posted by Section 8
THe other poster makes a good point that likely only one cam sproket is off.
That would explain why the exhaust note is noticable different now.

Tony
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