Well I finally decided to pull the block apart after my catastrophic failure. Results: all 4 pistons done.....have a look.http://adobe.kodakgallery.com/...eed=1
The other pics are just some reference timing pics I took.
I added some of the better pics to your thread for the dial-up users, WD
Finally took it Apart
Re: Finally took it Apart (ace0073)
So howd you blow it, figure out the cuase of it?
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Florida240sx
- Posts: 11114
- Joined: Thu Jul 01, 2004 7:17 am
- Car: 1993 Nissan 240SX Hatch 5spd
2012 Nissan Altima S coupe 2.5 - Location: DeLand FL
-
Florida240sx
- Posts: 11114
- Joined: Thu Jul 01, 2004 7:17 am
- Car: 1993 Nissan 240SX Hatch 5spd
2012 Nissan Altima S coupe 2.5 - Location: DeLand FL
Re: Finally took it Apart (480sx)
well thats a good question. guess it could be many things but since i was running a JWT tune, 72lb msd injectors, i figured 1 bar was doable. not sure exactly what happened but whatever it was, it was bad!
Re: Finally took it Apart (480sx)
just a repost for info from the experiences thread for info:
I hate to admit or type this but....its all my fault. Setup:95 KA..approx. 7000mi on engine pre-boostt3/t4 .63 aroil cooler/enlarged,baffled oil panjwt 72lb ecu72lb msd injsafc2avcr (this and my fingers are the culprits)re-worked ebay mani (heat coated in and out, braced)tial 38mm wgrebuilt shimmed oil pumpSPEC stage 3+ clutchturbo xs racing flywheelcrank scraper
After approx. 500 miles, DEAD!! Was running great off of 8lb wg spring (consistent 10 lbs of boost). One day i decide to install an safc 2 and avc-r.....next day KABOOM!! So what happened is that the car was running pretty good but after using my buddies wideband we saw AFR's of 10.5:1 throughout the rpm range. At that point i decided to get an safc 2 for fine tuning. I finally get everything installed but do not know how to adjust/tune the afc or avc and I only have a narrowband afr gauge so i KNOW not to turn up the boost until i get the wideband installed and get it tuned. Well thats not quite what happened. My brother shows up to my house smiling......purchased a new c6 corvette. since my car was finally running we decide we need to go cruising....san diego is the destination (1.5 hr trip). I told myself....do not hit that button if he tries to harass you! about 40 min into trip, im following behind him (same lane) and he steps on it....so do I. At that moment I reach down and turn the avc to setting A----1 bar. Instantly I am pulling on him pretty hard, light show gauge (narrowband afr) says green (rich), seconds later....white smoke...poof! Pull to the side, oil squirting out between transmission and block but car still idles. at this point i was hoping that maybe i just blew out the rear seal or something but after a compression test.....180-90-60-120; motor gone I could kick myself. feels good to know i was faster then the vette (especially way up on the top end) but it feels terrible to know he is still cruisin and im in the garage! Time to build a monster, unless i can find another cheap stock block to beat up on for a while....AFTER tuning this time. Needless to say, after my car was loaded onto the tow truck, my brother looks over and says, "great try, but come c me when u get that s**t fixed, fool!!" Then puts it in first and peels off..... ......like arnold, "i'll b back!!"
I hate to admit or type this but....its all my fault. Setup:95 KA..approx. 7000mi on engine pre-boostt3/t4 .63 aroil cooler/enlarged,baffled oil panjwt 72lb ecu72lb msd injsafc2avcr (this and my fingers are the culprits)re-worked ebay mani (heat coated in and out, braced)tial 38mm wgrebuilt shimmed oil pumpSPEC stage 3+ clutchturbo xs racing flywheelcrank scraper
After approx. 500 miles, DEAD!! Was running great off of 8lb wg spring (consistent 10 lbs of boost). One day i decide to install an safc 2 and avc-r.....next day KABOOM!! So what happened is that the car was running pretty good but after using my buddies wideband we saw AFR's of 10.5:1 throughout the rpm range. At that point i decided to get an safc 2 for fine tuning. I finally get everything installed but do not know how to adjust/tune the afc or avc and I only have a narrowband afr gauge so i KNOW not to turn up the boost until i get the wideband installed and get it tuned. Well thats not quite what happened. My brother shows up to my house smiling......purchased a new c6 corvette. since my car was finally running we decide we need to go cruising....san diego is the destination (1.5 hr trip). I told myself....do not hit that button if he tries to harass you! about 40 min into trip, im following behind him (same lane) and he steps on it....so do I. At that moment I reach down and turn the avc to setting A----1 bar. Instantly I am pulling on him pretty hard, light show gauge (narrowband afr) says green (rich), seconds later....white smoke...poof! Pull to the side, oil squirting out between transmission and block but car still idles. at this point i was hoping that maybe i just blew out the rear seal or something but after a compression test.....180-90-60-120; motor gone I could kick myself. feels good to know i was faster then the vette (especially way up on the top end) but it feels terrible to know he is still cruisin and im in the garage! Time to build a monster, unless i can find another cheap stock block to beat up on for a while....AFTER tuning this time. Needless to say, after my car was loaded onto the tow truck, my brother looks over and says, "great try, but come c me when u get that s**t fixed, fool!!" Then puts it in first and peels off..... ......like arnold, "i'll b back!!"
Re: Finally took it Apart (ace0073)
Well it definitely looks like detonation. Doesn't look too horrid since the piston tops still seem pretty ok.
Re: (NateDogg)
well, I just hooked up a oil catch can and all the tubing to and from the intake, oil can, valve cover. Is that ventilation? Could lack of ventilation be the cause? What do you recommend?
At higher boost pressure the chances of contamination of the combustion chamber from blow-by is increased.
Specifically how did you route the PCV? I removed the PCV from my vehicle and added a pipe fitting ran it to a catch can then to the intake through a check valve.
The idea is to have air flow into the engine through the valve cover and out the PCV (oil separator box). This help lower pressure inside the crankcase, helping ring seal and reducing chances of contamination of the combustion chamber.
Specifically how did you route the PCV? I removed the PCV from my vehicle and added a pipe fitting ran it to a catch can then to the intake through a check valve.
The idea is to have air flow into the engine through the valve cover and out the PCV (oil separator box). This help lower pressure inside the crankcase, helping ring seal and reducing chances of contamination of the combustion chamber.
Re: (NateDogg)
if i remember correctly, i routed one hose from the catch tank to the valve cover. the other went to the vacuum line below the throttle body and t'd off to between the air filter and turbo. do we need evap pumps or some other system?
You dont need a pump. It is beneficial if you can create a vacuum into the crankcase via bernoulli's "slash cut" method. You might want to google that. You can create a vacuum by running a line from the crankcase to the turbo inlet tube with the slash cut, or like many hot rodders do, run a line to the exhaust with an inline check valve.
If neither of those options works, the next best thing is to vent the crankcase to atmosphere by just running an open hose to out of the engine bay or sending it to a breather tank with one of those little filters on top.
Check this out:
http://www.beesandgoats.com/bo...l#PCV
Nate
If neither of those options works, the next best thing is to vent the crankcase to atmosphere by just running an open hose to out of the engine bay or sending it to a breather tank with one of those little filters on top.
Check this out:
http://www.beesandgoats.com/bo...l#PCV
Nate
Re: Finally took it Apart (ace0073)
thats crazy dude, it's extra crispy.
ace0073 wrote:Well I finally decided to pull the block apart after my catastrophic failure. Results: all 4 pistons done.....have a look.http://adobe.kodakgallery.com/...eed=1
The other pics are just some reference timing pics I took.
I added some of the better pics to your thread for the dial-up users, WD