Piston cracked...what could have caused this? *PICS*
10-13-2007, 11:08 PM
#1
Honda-Tech Member
Thread Starter
Join Date: Feb 2006
Location: East Bay, CA, USA
Posts: 1,524
Likes: 0
Received 0 Likes
on
0 Posts
Piston cracked...what could have caused this? *NEW PICS*
My motor had been running very well for three months at 15psi making 360whp daily. This was done on pump gas (91)...I know I was pushing it on shitty cali 91 octane for daily driving. The day before I took it out to the track I went back to the dyno to do some pulls with open downpipe. It made 392 on the same 15psi. I took it to the track and right after the second pass I heard lots of noise and knocking and I thought I spun a bearing so I shut it off and pushed it back to the pits. Towed it home and took it apart and this is what happened to #2...crappy camera!
Any ideas on what might have happened? Ran lean? Injector went out? or the tune? The other pistons have very little wear on the sides and skirts but nothing like this one.
Modified by champLSinteg at 10:52 AM 10/14/2007
Modified by champLSinteg at 10:52 AM 10/14/2007
Any ideas on what might have happened? Ran lean? Injector went out? or the tune? The other pistons have very little wear on the sides and skirts but nothing like this one.
Modified by champLSinteg at 10:52 AM 10/14/2007
Modified by champLSinteg at 10:52 AM 10/14/2007
10-14-2007, 01:23 AM
#5
HT White Ops
iTrader: (4)
Join Date: Oct 2005
Location: Ova Thur, United States
Posts: 6,116
Likes: 0
Received 0 Likes
on
0 Posts
Re: Piston cracked...what could have caused this? *PICS* (champLSinteg)
Yeah its hard to help you when we can't even see what happened! Why even post those pictures? Get some new pictures!
A little more information might be helpful! What pistons??
A little more information might be helpful! What pistons??
10-14-2007, 04:18 AM
#6
Honda-Tech Member
Join Date: Jan 2004
Location: Tampa, FL
Posts: 1,251
Likes: 0
Received 0 Likes
on
0 Posts
Re: Piston cracked...what could have caused this? *PICS* (SD_Lurker)
that camera doesn't suck, but the person who took the pictures do.
Get yo self a Ford and FOCUS!
Get yo self a Ford and FOCUS!
Trending Topics
10-14-2007, 05:58 AM
#9
Honda-Tech Member
Re: (I Have an STD)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by I Have an STD »</TD></TR><TR><TD CLASS="quote">open downpipe makes you leaner. leaner makes you melt/crack pistons. dont run open downpipe whe you're tuned with a full exhaust.</TD></TR></TABLE>
not all the time.......
anyway, your pics suck.
what injectors did you have
not all the time.......
anyway, your pics suck.
what injectors did you have
10-14-2007, 09:58 AM
#12
Honda-Tech Member
Thread Starter
Join Date: Feb 2006
Location: East Bay, CA, USA
Posts: 1,524
Likes: 0
Received 0 Likes
on
0 Posts
Re: (tepid1)
LOL... I was late last night and the pics didnt look that bad then...new pics are up that are somewhat better!
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DC4KiD »</TD></TR><TR><TD CLASS="quote">Looks like your motor was running too hot and the piston expanded too much and scratched the walls.</TD></TR></TABLE>
I did notice my temp needle at 3/4 of the way hot at the end of the run but coolant was fine.
These were flat top 9.8:1 Wiseco pistons. Is this too high for me?
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DC4KiD »</TD></TR><TR><TD CLASS="quote">Looks like your motor was running too hot and the piston expanded too much and scratched the walls.</TD></TR></TABLE>
I did notice my temp needle at 3/4 of the way hot at the end of the run but coolant was fine.
These were flat top 9.8:1 Wiseco pistons. Is this too high for me?
10-14-2007, 10:15 AM
#13
Honda-Tech Member
Re: (champLSinteg)
piston-wall clearance was probably on the tight side and you over heated it.. you skuffed it.
run those things a little looser next time.
run those things a little looser next time.
10-14-2007, 10:19 AM
#14
Honda-Tech Member
Thread Starter
Join Date: Feb 2006
Location: East Bay, CA, USA
Posts: 1,524
Likes: 0
Received 0 Likes
on
0 Posts
Re: (JDogg)
Thats what I though but I had piston to wall clearance at .0025 which is what wiseco reccomends because of the coating. Unless my machine shop left it tighter than that.
10-14-2007, 11:08 AM
#16
Honda-Tech Member
Thread Starter
Join Date: Feb 2006
Location: East Bay, CA, USA
Posts: 1,524
Likes: 0
Received 0 Likes
on
0 Posts
Re: (tepid1)
I was going to set it at .0035 but Wiseco suggested .0025 because of the .001 layer of coating.
I just got a set of CPs...should I go with their reccomended clearance of .0035 i think or bigger?
I just got a set of CPs...should I go with their reccomended clearance of .0035 i think or bigger?
10-14-2007, 12:37 PM
#17
Honda-Tech Member
iTrader: (4)
Join Date: Apr 2005
Location: Tacoma, WA
Posts: 611
Likes: 0
Received 0 Likes
on
0 Posts
Re: (DC4KiD)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DC4KiD »</TD></TR><TR><TD CLASS="quote">Looks like your motor was running too hot and the piston expanded.</TD></TR></TABLE>
10-14-2007, 01:42 PM
#19
Honda-Tech Member
Thread Starter
Join Date: Feb 2006
Location: East Bay, CA, USA
Posts: 1,524
Likes: 0
Received 0 Likes
on
0 Posts
Re: (mighty137)
what would make it run that hot? cooling problem? or running lean?
When i put it back on the dyno the AF was in the low 11's.
When i put it back on the dyno the AF was in the low 11's.
10-14-2007, 02:24 PM
#20
Re: Piston cracked...what could have caused this? *NEW PICS* (champLSinteg)
Digital Picture taking 101: 1.)For very close up shots, use the macro setting on your camera 2.) cameras have a minimum focus distance. You are obviously too close, back up and zoom in.
10-14-2007, 04:31 PM
#21
Junior Member
Join Date: Jul 2004
Location: perry, ga, usa
Posts: 472
Likes: 0
Received 0 Likes
on
0 Posts
Re: (DC4KiD)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DC4KiD »</TD></TR><TR><TD CLASS="quote">Looks like your motor was running too hot and the piston expanded too much and scratched the walls.</TD></TR></TABLE>
10-14-2007, 05:29 PM
#23
Honda-Tech Member
Join Date: Mar 2002
Location: in this nutshell
Posts: 2,657
Likes: 0
Received 0 Likes
on
0 Posts
Re: (champLSinteg)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by champLSinteg »</TD></TR><TR><TD CLASS="quote">
I did notice my temp needle at 3/4 of the way hot at the end of the run but coolant was fine.
</TD></TR></TABLE>
if it goes past halfway...something is up....you should have shut it down after you saw that. what radiator are you running?
I did notice my temp needle at 3/4 of the way hot at the end of the run but coolant was fine.
</TD></TR></TABLE>
if it goes past halfway...something is up....you should have shut it down after you saw that. what radiator are you running?
10-14-2007, 05:47 PM
#24
Honda-Tech Member
Thread Starter
Join Date: Feb 2006
Location: East Bay, CA, USA
Posts: 1,524
Likes: 0
Received 0 Likes
on
0 Posts
Re: (philafelman)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by philafelman »</TD></TR><TR><TD CLASS="quote">
if it goes past halfway...something is up....you should have shut it down after you saw that. what radiator are you running?</TD></TR></TABLE>
I noticed the temp after I crossed the traps and I shut it down soon after that. I am running a half size radiator, dual core from a del sol.
if it goes past halfway...something is up....you should have shut it down after you saw that. what radiator are you running?</TD></TR></TABLE>
I noticed the temp after I crossed the traps and I shut it down soon after that. I am running a half size radiator, dual core from a del sol.
10-14-2007, 05:48 PM
#25
Honda-Tech Member
Thread Starter
Join Date: Feb 2006
Location: East Bay, CA, USA
Posts: 1,524
Likes: 0
Received 0 Likes
on
0 Posts
Re: (champLSinteg)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tepid1 »</TD></TR><TR><TD CLASS="quote">Even with CP's set it at .0045
Do I really need to show you pics of black death and CP's at .0035? lol</TD></TR></TABLE>
Show me, i'd like to see them!
Do I really need to show you pics of black death and CP's at .0035? lol</TD></TR></TABLE>
Show me, i'd like to see them!