pitted piston questions
04-14-2012, 05:39 PM
#1
Teching In
Thread Starter
Join Date: Feb 2012
Posts: 24
Likes: 0
Received 0 Likes
on
0 Posts
pitted piston questions I bought an lq9 a couple weeks ago and barely started digging into it. Not liking what I've found so far. I pulled the driver side head and found the pistons are pitted pretty good. The very back one is the worst and the 3rd cylinder wall has a nice sized spot of discoloration. What causes a piston to pit like this and how should I go about rebuilding this? I plan on swapping this into my 91 s10 blazer and just want a basic rebuild, nothing too major. I can't get the cylinder wall pic to load but I'll retry it. Any help is greatly appreciated.
04-14-2012, 05:43 PM
#2
On The Tree
Join Date: Jun 2009
Location: Pawtucket, RI
Posts: 195
Likes: 0
Received 0 Likes
on
0 Posts
ive seen pitting exactly like that in burnt engines. ive bought a few fire motors from the junkyard for parts seems they get that way from water in the cylinder.
04-14-2012, 06:04 PM
#3
Teching In
Thread Starter
Join Date: Feb 2012
Posts: 24
Likes: 0
Received 0 Likes
on
0 Posts
I did notice some water draining when I pulled the head. Another question, is this an lq4 because the pistons are dished? I was told it was an lq9 when I bought it.
04-14-2012, 06:38 PM
#4
On The Tree
Join Date: Jun 2009
Location: Pawtucket, RI
Posts: 195
Likes: 0
Received 0 Likes
on
0 Posts
u got lied to, its and lq4 lq9 are dished w/ floating wristpins pop off the pan, pickup tube and windage tray and snap me a picture of the connecting rods and ill tell u what year it is
04-14-2012, 07:24 PM
#5
Teching In
Thread Starter
Join Date: Feb 2012
Posts: 24
Likes: 0
Received 0 Likes
on
0 Posts
04-15-2012, 09:53 AM
#6
On The Tree
iTrader: (1)
Join Date: Jan 2008
Location: Upstate NY
Posts: 143
Likes: 0
Received 0 Likes
on
0 Posts
I have new ls2/lq9 pistons,rods,wrist pins and bearings for $250 these are flat top pistons and the good floating rods. I also have many other lq9 and lq4 parts for sale extra blocks heads misc. parts
04-15-2012, 01:27 PM
#7
Teching In
Thread Starter
Join Date: Feb 2012
Posts: 24
Likes: 0
Received 0 Likes
on
0 Posts
Can anyone identify what year my engine would be from? Also if I just get some used lq4 pistons to swap in would i need to get everything balanced? If so I may just upgrade everything now. Any advice on the cylinder wall too? Do i need to get it bored or would honing it be enough.
Trending Topics
04-16-2012, 01:07 AM
#8
On The Tree
Join Date: Jun 2009
Location: Pawtucket, RI
Posts: 195
Likes: 0
Received 0 Likes
on
0 Posts
thats a pre 05 motor due to the style of connecting rods the 05+ rods are a bit stronger and use floating pins those are press fit pin rods. any time you swap any internal component with another definately get it rebalanced it may hone out try it and see how the walls look personally i would run those pistons you will be fine just throw on some hellfire rings and some arp rod bolts and your ready to roll
