about to but another 1g

[minuteswidegsx]

so i found a 93 mitz gsx in my town. the car runs but has a knock. its not a rod, i have had my fair share of those. (what dsmr hasnt) its a knock right of the bat. its in the top end. feels under the valve cover. and as soon as you crank it before it starts it makes the knock or more of a beat. it has perfect compression 165 all 4. starts right up. any ideas? thanks guys

 

[doubleclutch99]

It could be a piston wrist pin or piston slap just what it sounds like to me, at least if your description is correct. the valves sound good with the high compression. and the lifters would make more of a ticking sound . if it's a rod or a main knock you might be able to see it with a manual oil pressure gauge. oil psi should go up and down depending on how bad the knock is

 

[habitatguy187]

Pull the valve cover and check it out, may just be a rocker arm off.

 

[gingerbredman00]

^^Yep Yep^^

 

[DSM1G90]

and if rocker arm off, wouldn't the spark plug look rather raunchy while the others looked clean?

 

[minuteswidegsx]

ya i havent got it to my house yet. and i dont want to pull the valve cover yet to see if it a lifter. i hope it is. maybe the cam to, that would be fine have extras., thanks for some input.

 

[SlickGSX]

Could be the timing belt tensioner.