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Timing chain stretch vs engine torque
My 103 engine has a hard time pulling my '91 300SE around under the best of conditions.
However, lately the low-end torque seems even worse. with 160k miles, I suspect the long timing chain may have stretched enough to retard the valve timig a bit - a sure way to lose some low-end torque. The old motor is in great shape - valve job at 120k, good compression, no oil use, smooth idle, well-tuned, and good power above 3000 rpm. It just struggles more lately to get that big old car going from a red light. I know these chains are not trouble-prone, but it's a pretty long distance from crank to cam sprocket, and just a bit of stretch could retard the timing 5-10 degrees I would think. Any thoughts or experience here? Any other ideas on what could hurt the torque below 3000 rpm? Maybe a partially clogged cat is about all I can think of. tks, s-class guru |
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