Ewenm
NAXJA Forum User
- Location
- Gold Coast Australia
hi
i have a 1994 xj limited l6 ( export model) and am wondering how a stretched timing chain might effect performance
I've owned my car since it was three years old so am aware of how it used to perform, with that said and with 400,000 kilometres on the clock i realise its no longer new.
the compression is all around 135 psi, the back cylinder a little lower from memory 128
a vacuum gauge reads a little low indicating worn rings.
i have 31 inch tyres but have regard to 4.10 gears back and front
the car has great standing start acceleration but then drops off around 2000/2500 rpm, while cruising on the highway it runs well and gets reasonable fuel economy.
but in hilly country it lacks some punch.
so I'm wondering if a stretched chain could retard the cam enough to effect it this way
i did the take out the plugs and rotate the crankshaft back and forth to try and gauge how much slop there was in the chain by watching the effect on the distributor rotor button, but that was inconsistent, my helper didn't under stand what we were looking for.
so again will a stretched timing chain allow for good pickup down low but average to poor performance up high
what do you think, i also have the standard rear main seal leak ( has been ever since i owned the car) and the front seal weaps, the harmonic balancer damper rubber is showing very slight signs on bulging so its not unreasonable of me to do a job on the sump etc, trouble is I'm 62 and finding crawling under cars not that attractive any longer heheheh
thanks for reading
Ewen
i have a 1994 xj limited l6 ( export model) and am wondering how a stretched timing chain might effect performance
I've owned my car since it was three years old so am aware of how it used to perform, with that said and with 400,000 kilometres on the clock i realise its no longer new.
the compression is all around 135 psi, the back cylinder a little lower from memory 128
a vacuum gauge reads a little low indicating worn rings.
i have 31 inch tyres but have regard to 4.10 gears back and front
the car has great standing start acceleration but then drops off around 2000/2500 rpm, while cruising on the highway it runs well and gets reasonable fuel economy.
but in hilly country it lacks some punch.
so I'm wondering if a stretched chain could retard the cam enough to effect it this way
i did the take out the plugs and rotate the crankshaft back and forth to try and gauge how much slop there was in the chain by watching the effect on the distributor rotor button, but that was inconsistent, my helper didn't under stand what we were looking for.
so again will a stretched timing chain allow for good pickup down low but average to poor performance up high
what do you think, i also have the standard rear main seal leak ( has been ever since i owned the car) and the front seal weaps, the harmonic balancer damper rubber is showing very slight signs on bulging so its not unreasonable of me to do a job on the sump etc, trouble is I'm 62 and finding crawling under cars not that attractive any longer heheheh
thanks for reading
Ewen