OIL dripping FROM the air filter thru crankcase vent hose..!!!

[240SicknessX]

Well I dropped in a cap full of oil into that cylinder and it went from 100 to 130 on the gauge..

according to a vocational book that i have here, if there is more then 10psi increase between dry and wet tests, then the compression is genrally leaking past the rings, and when wet=dry or < 10psi on wet compared to dry test, compression is genrally leaking past the valves.

also, a 20% variation between the cylinder readings is usally satisfactory.

[NateDogg]

I'd say the rings are shot. It should be within +-15psi of the others to be usable.

[Structure240sx]

sorry buddy but the rings on #4 are gone

[virus77]

I hate to say it but thats the same way it happended to my car, everything was running fine and one day BAM, gooybye rings.

[DammitBobby]

I feel your pain:( Thanks for posting I have learned a lot from reading. I just wished it turned out better for you.

[rn240sx]

Yeah, it sux royally... Well lets see...

March 03 turbo was put on and it ran at 10 psi until August 04. Then I upgraded the fuel system and kicked up the boost to 15 psi... It held from then till yesterday..!!

Well, i guess im gonna yank this motor out, drop in my other spare ka thats sitting here in the garage for temporary use...and rebuild this one that i just popped...!!

Poor motor only had 47k miles....

[ILikeMy240sx]

Your motor has 47k miles and it blew a ring at 15 psi... hmmm

How was your tuning?

[rn240sx]

Jwt ecu..

I honestly DONT know what caused this... All i know is that I was on my way to the dyno and i was gonna adjust the boost controller to VERIFY that my low boost was at 12 psi and hi boost was at 15 psi...!!!

I was in low boost and I went WOT, and i recall that my rpm's were almost at 6k before i felt the MOTOR hit very quickly and HARD...!! I never even looked at my boost gauge nor looked at my wideband o2 gauge... So i cant say that it spiked past 15 psi OR if it went lean beyond control to the point where it was too late..!!!

I wish I had been watching one of those 2 gauges so i could know if it was over boosting or fuel related...

Once that happened, i guess the oil shot up and came out thru the valve cover vent hose and messed up my maf and filter..!!!

But now i have an excuse to rebuild with forged internals..!!!And yes it does suck cause this motor ONLY had 47k miles...

Im just wondering if i should just buy forged pistons and leave the stock rods there... or what..??

[nissanfanatic]

Unless you plan on surpassing 550whp, then the stock rods should work. Ivan just posted up what the stock rod limit is.

[fastpace]

Jwt ecu..

I honestly DONT know what caused this... All i know is that I was on my way to the dyno and i was gonna adjust the boost controller to VERIFY that my low boost was at 12 psi and hi boost was at 15 psi...!!!

I was in low boost and I went WOT, and i recall that my rpm's were almost at 6k before i felt the MOTOR hit very quickly and HARD...!! I never even looked at my boost gauge nor looked at my wideband o2 gauge... So i cant say that it spiked past 15 psi OR if it went lean beyond control to the point where it was too late..!!!

I wish I had been watching one of those 2 gauges so i could know if it was over boosting or fuel related...

Once that happened, i guess the oil shot up and came out thru the valve cover vent hose and messed up my maf and filter..!!!

But now i have an excuse to rebuild with forged internals..!!!And yes it does suck cause this motor ONLY had 47k miles...

Im just wondering if i should just buy forged pistons and leave the stock rods there... or what..??

I thought you also stated on ka-t.org that you leaned out your system alittle bit with tyour safc?

[rn240sx]

When i was on 100 octane, yes i did lean it out a bit cause jwt had it running in the low 10's..

I leaned it up to run in the flat 12's...

Then realizing that i was wasting money buying race gas, i dropped back down to 93 octane pump gas and reset the afc back to ZERO, then my afr's went back to the 10's..

I ran 93 octane for about 3 weeks and then i was on my way back to the dyno when i would guess from what everyone is saying that my ring land cracked..

[sil80drifter]

odd.... JWT is usually so conservative.... otherwise i'd say it was our timing, being too advanced. Actually maybe it was. When you mess with the SAFC, and make things leaner, the ECU, seeing lower fuel values usually advances the timing. Happened to me too, not JWC ECU but regular, with SAFC. then you either hear or don't hear the ping, but it's there. Not because of lean, but because of lean AND advanced timing.

sil80

[rn240sx]

The afc was reset back to zero about 3 weeks b4 this happened. Whatever caused this, i cant tell u what it was. All i know is that once i get back home to Florida, im gonna order new Pistons, Headgasket, ARP bolts... And rebuild most of the bottom end.

But for now the question is what caused this..??

[virus77]

How many miles did you have with the turbo on the car, and at what boost? Similiar thing happened to my car, my only explanation is the since the KA has weak lands, they eventually break from too much power. They definatly handle it at first, 8000 miles in my case.

[nissanfanatic]

My vote goes to weak lands. I mean 15psi is asking a lot from the stock pistons.

[silviaxspress]

My mechanic said my rings are worn out also. Oil is comming out of my valve breather also.
Modified by silviaxspress at 5:30 AM 3/12/2005

[silviaxspress]

Those compression is okay.
Modified by silviaxspress at 5:32 AM 3/12/2005

[silviaxspress]

My engine was registered on 03/03/2003 with 46,645 miles.Now on 07/31/2004 it had 50,116 miles. It's already laying to rest.
Modified by silviaxspress at 5:29 AM 3/12/2005

[npaulseth]

Unless you plan on surpassing 550whp, then the stock rods should work. Ivan just posted up what the stock rod limit is.

Keep in mind that was only 1 rod. If an injector was stuck for a spilt second, or there was any knock in that one cylinder, it would have caused that same result. Keep in mind that it was a boost spike/creap that caused the meltdown, not a "tuned" map.

[turtl631]

Kinda discouraging to hear this...I was hoping to get around 300, 310 whp on stock block, but the 15 psi stock block setups dont seem to be doing well. Stepping up to a built block is sooo much more money..what's the least one could expect to pay for just forged pistons, stock bore, installed? Is there any way to put them in yourself with a hone if your bores are still pretty clean?

[koukiKA240]

Your compression still looks good, at least compared to mines. Front #1 150#2 160#3 100 OUCH!#4 100 KILL ME!Rear

I already have JE pistons and Crower Rods for internals and it's bored over .20mm bottom. But never had it tuned or changed the MAF, those were the last 2 upgrades I needed.

Those are your numbers with a built motor?? How long did it take before you dropped that far?~Sam

[rn240sx]

To Turtle631:

There are LOTS of ka-t's running around that are putting down well over 300 rwhp.. on stock bottom ends.. And most of them are daily drivers..

Dont under estimate the bottom end of this ka motor. Its pretty strong, but not bullet proof..

In my case, I was not so lucky simply cause something failed, dont know what was the direct cause, but something failed. Its been running at 15-16 psi for over 6 months and i never had any problems until that one day..

But its all good, monday im gonna call and order the internals and have this motor built to support 400 rwhp...

I do believe that this motor will do 350 rwhp... on a stock block for a while, but if i have to open it up to fix it, its gonna get forged internals..!!! Im not gonna do an oem rebuild and risk it popping like it did last time, at least with the forged internals, if that same problem arose again, at least the motor will hold that abuse and not just break like it did...

[Red-KAT]

Hey WD... When I added a catchcan to my car is leand out my idle mix... And becuse this stupid piggy back ecu it wont go back... Any ideas besides removing the can? I guess 16afr is not going to kill me at idle... But its not what I like.

[turtl631]

Good call RN240Sx, now that I've been looking more, I've seen more 300 whp+ stock block cars that lasted. the white bunny is one that comes to mind, and i saw a few others too. Maybe you should sell your gauges and get some with peak/warn/hold functions so you can be alerted to overboosting, etc. Its difficult to keep an eye on your gauges when you're driving hard. Good luck with the built engine.

[WDRacing]

Never heard of that before. What piggy back are you using? Try adding 1-2 lbs of fuel pressure.

WD