Foxfan88 said:I know the cyl wall expands and all that, but does just abuse cause it?
I have some piston slap, its noticable, but not too bad. i dont abuse the car so maybe the people before me????
HISSIN50 said:It depends upon what kind of slugs are used. Guys, remember that dissimilar metals have different rates of expansion.
Forged slugs are more likely to have cold (start up) slap since they fit looser in the bores when cold, because of this (hypereutectic pistons fit tighter than forged, so no slap).
DMAN302 said:Guys who "know there stuff" are often quite far off base when they diagnose by ear..your not hearing Piston slap if the motor is at temp...that knocking sound is likely a more serious issue making itself known. Worn rings are not going to be heard..but seen when the throttle is applied and smoke is leaving the tail pipes. Sorry to sound grim..but any knocking when at temp is something you really don't want to hear..cold start up..ok..warm..um not a good thing at all. My 88's original motor had 200,000 miles and some SERIOUS blowby issues near the end (bless her soul)..but she was quite and polite right up to the day I pulled her (ran like a raped ape but used a quart every 100-200 miles ). Get an oil pressure gauge on that thing and FIND out what that knocking sound really is. Or just leave it and sell her like you indicated you were going to do on another thread.
Foxfan88 said:were trying to get my guage problem fixed shortly, i dont have a good oil pressure guage at all, i havent had a guage since i've had the car
There isnt a knock at temp there is a knock when overheating, now i dont think its a bearing, or it should do it all the time.
This sound i hear all the time is probably just some rocker noise thats normal. My mind may be playing tricks on me. Or it could be some slight detonation since i think my balancer might be bad.
But i still think its a some piston slap, when overheating the oil's visocity is reduced, so there is more room for piston movement, am i correct?
Now right now i am running a tad thicker oil than normal on my last change, i am due for a change here in the next week so what type of oil, thickness? and are there any additives i could use???