Stock Piston rings gone bad
#1
Thread Starter
Join Date: May 2002
Location: 無限 Its slow, NJ
Posts: 2,660
Likes: 0
Received 0 Likes
on
0 Posts
Stock Piston rings gone bad
Car is an my02, 68k miles and 4k boosted with a FR Gt35r setup. Motor had low compression on Cyl #4 (180, 180, 180, 150) It wasn't super low so we thought the HG was on its way out. Car was also experiencing low to no heat at idle (stationary) but heat while moving. Rad also wasn't pulling coolant from the overflow back into the system..
After pulling the head off, we found the 4th cyl had some decent scoring and some pretty heavy gouges. He pulled the rest of the motor apart last week and the 4th cyl piston also had some nice skirt damage but the rings were all intact. All the other cylinders, the rings were all damaged.
3mm HG had about 4k miles at 580whp. Car only saw 93oct but from what I've been told this could have been from a bad tank of gas.
After pulling the head off, we found the 4th cyl had some decent scoring and some pretty heavy gouges. He pulled the rest of the motor apart last week and the 4th cyl piston also had some nice skirt damage but the rings were all intact. All the other cylinders, the rings were all damaged.
3mm HG had about 4k miles at 580whp. Car only saw 93oct but from what I've been told this could have been from a bad tank of gas.
#3
This is why I completely stay away from pump piss and at least run a higher 110 octane cheap race gas all the time.
#4
Registered User
Join Date: Jan 2005
Location: San Diego
Posts: 772
Likes: 0
Received 0 Likes
on
0 Posts
YIKES!!! w/ those coolant issues, my guess it that ur HG was done for as well.
what did cyl #4's rod bearing look like? u may have spun it... our engines especially my02 and earlier have always been prone to what seems to be cyl 4 oil starvation issues for some reason??? also, the other 3 cylinder's rings being damaged might have caused enough loss in oil pressure to eventually spin cyl #4's bearing....
i blew a headgasket, then eventually spun cylinders 1 and 4... LAME!
what did cyl #4's rod bearing look like? u may have spun it... our engines especially my02 and earlier have always been prone to what seems to be cyl 4 oil starvation issues for some reason??? also, the other 3 cylinder's rings being damaged might have caused enough loss in oil pressure to eventually spin cyl #4's bearing....
i blew a headgasket, then eventually spun cylinders 1 and 4... LAME!
#5
Registered User
Join Date: Oct 2006
Location: Westchester NY
Posts: 2,507
Likes: 0
Received 0 Likes
on
0 Posts
how does the piston ring problem effect the rad not pulling coolant back from the overflow tank? that sounds like a rad cap problem?
also what do you mean by no heat? no hot air from the hvac system inside the car? or do you mean coolant temps were low at idle and high while moving? still seems kind of normal with more load on the engine at speed.
i know you know your ish, just curious for a little better explanation.
good luck with the rebuild! are you going to use all oem stuff? or go with an overbore/new pistons?
also what do you mean by no heat? no hot air from the hvac system inside the car? or do you mean coolant temps were low at idle and high while moving? still seems kind of normal with more load on the engine at speed.
i know you know your ish, just curious for a little better explanation.
good luck with the rebuild! are you going to use all oem stuff? or go with an overbore/new pistons?
Trending Topics
#9
Registered User
Join Date: Oct 2006
Location: Westchester NY
Posts: 2,507
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by JoeyBalls,Mar 29 2010, 06:27 PM
Jeff, who's car is this, PM me you want to keep it private, thanks
EDIT: nvmind he doesn't have a FR setup.
#10
Originally Posted by m R g S r,Mar 29 2010, 06:25 PM
how does the piston ring problem effect the rad not pulling coolant back from the overflow tank? that sounds like a rad cap problem?
also what do you mean by no heat? no hot air from the hvac system inside the car? or do you mean coolant temps were low at idle and high while moving? still seems kind of normal with more load on the engine at speed.
i know you know your ish, just curious for a little better explanation.
good luck with the rebuild! are you going to use all oem stuff? or go with an overbore/new pistons?
also what do you mean by no heat? no hot air from the hvac system inside the car? or do you mean coolant temps were low at idle and high while moving? still seems kind of normal with more load on the engine at speed.
i know you know your ish, just curious for a little better explanation.
good luck with the rebuild! are you going to use all oem stuff? or go with an overbore/new pistons?