Jump to content
SAU Community

Recommended Posts

Hi Guys,

Throwing this on here to see what you think, Engine was bone stock with bolt ons.

Car had covered approx 100,000 Miles, Mix of KMS and miles so no true idea.

I ran round in the car stock for approx 10k miles my self and all was well, Super silent, Made good power, Burnt no oil etc

After the car was rebuilt i fitted a new water pump, Single turbo kit and all other supporting mods

Car was running fine, Sat at usual oil pressure on tickover (Just below middle on stock gauge)

Has it mapped gradually for 1.2 Bar of boost on a HX35 12cm with no problems, Until my brand new turbo failed. Bearing collapse.

Got a replacement sorted, And for piece of mind i flushed the oil with 4 lots of 5w-30 (Only on the 3rd oil change did i run the car gently round the block, the other times where purely tickover)

Changed for a generic 5w-40 fully and carried on

At this point the car developed a light tick, And using a stethoscope identified it was one of the exhaust lifters. Stupidly i ignored this and drove the car. Cue 50kms later and on hot tickover the oil light came on, As well as my gauge dropping to zero. Blipping the throttle and driving it the gauge read normal.

Got home, Dropped the oil immediately to find a very fine metal content in the oil. f**k,

Pulled off the rocker to find it had cracked a bucket, Shim rattling about hence the noise.

Here are some photos anyway.

Also as a result of the oil contamination, It has scored all the bearings in the bottom end (Driving the car obviuosly never helped)

20150905_170035_zpsuh0hpwqd.jpg

20150905_170035_zpsuh0hpwqd.jpg

20150905_170035_zpsuh0hpwqd.jpg

Now i have a few ideas, Oil pump failed which in turn killed the lifter, Small fragments then got chewed up and killed the bottom end.

Other one is the lifter failed,, Killed the pump, Killed the bearings

Third idea is turbo bearings killed the pump, killing the rest in turn.

Or lastly the oil pressure problem was purely a dodgy sender and the rest of the problems came about due to the turbo?

Would like to note there was no over revs, Missed gears or any particular hard use. Purely a few boost runs.

Any input would be great!

I Will also be building another engine out of a stock neo, So ideas on what to go for on a 600hp street car taking to regular track days would be nice, Idea at the moment is spool rebuild kit (Rods, pistons, bearings and headgasket. Along with arp bolts)

Or do i throw a stroker in there? Surely its not needed?

And another question, Are the 25NEO Buckets the same diameter as the 26 ones? Wouldnt mind converting to shim under bucket if possible... Again if its needed!

Thanks!

Link to comment
https://www.sau.com.au/forums/topic/459736-rb25neo-failure/
Share on other sites

Even those fine particles will be filtered out before doing bearing damage most likely, unless your filter was bypassing.

I suspect the oil pump was faulty which caused the other issues. What caused the failure who knows, but it would have had to fit through the mesh in the pickup.

Link to comment
https://www.sau.com.au/forums/topic/459736-rb25neo-failure/#findComment-7604492
Share on other sites

No external cooler etc was added, All stock on that side. After initial turbo failure i flushed the car on tickover with a 5w30 semi 3 times to try clear any shite left over from the bearing on the turbo. Was told this was too thin and could cause damage but surely this is bullshit when running it on tickover?

Link to comment
https://www.sau.com.au/forums/topic/459736-rb25neo-failure/#findComment-7605637
Share on other sites

Think its just a coincidence to be honest. The cracked bucket does worry me though as the next engine will be a NEO. Want to fit new springs and retainers but cant see uprated buckets anywhere. Or info on converting to shim under bucket.

Link to comment
https://www.sau.com.au/forums/topic/459736-rb25neo-failure/#findComment-7607371
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Seat of the pants assessment of the new intake: The car is way less "doughy" when hitting the loud pedal, especially off idle when stopped or in traffic, I did use a cheapo lazer thermal thingo to measure the temp around where the pod filter got its air, it was between 55 - 60°C, in saying this the car was shut off and not moving, so the OEM intake pipe was not supplying any fresh air to where the pod was when the car was at least moving A weird bonus was induction noise on the throttle in the cabin increased a bit,  I was worried that I was actually going to lose some of that induction noise I love so much, outside though, when I got the daughter to do a WOT drive by pass for me, the induction noise has increased alot when on the throttle, not quite ITB doort, but well up there I'm extremely happy with the results and have been exploring the country roads in the region  As for house mods: 1.New front fence is up and is awesome, it really upgraded how the joint looks from the street, and the added security is nice 2. Electricians have replace some interior lights, and with more lighting in the garage, a few new motion detecting lights out the front above the garage, front room, and at the front door, which I have already found heaps helpful coming and going, also now has fancy pants CCTV all round the house The only hold point for power though is the solar and batteries due to supply issues, although this will happen over the next few weeks 3. I have done a heap of landscaping out the front and I'm almost ready to do a new small retaining wall with some nice blocks to replace the brick and cemented in rocks around the raised garden beds cemented in river stone "was the fashion at the time" the house was built. I currently have a pallet of retaining wall blocks and 2 bulka bags of 20mm blue metal to replace the wood chip that is in the raised garden beds around the house 4. I now have 3 big raised garden beds for out the back to grow some vegetables, about 70cm high, 200cm long and 100cm wide 5. My 2 compost bins are already pretty full with brown, green and kitchen waste from the landscaping I'vedone so far, but they will probably take a few months to break down, so anything else that gets chopped, trimmed, and kitchen waste will just start filling the base of the raised garden beds to about 30cm before I start throwing 40cm of good compost, and stuff, for the vegetables to grow in, I'll need a few ton of compost and soil, but the local supplier can sent me bulka bags of the stuff Basically the logs, wood chips and a few strategically placed rocks for drainage, will give the beds some good organic materials down low to break down over time, and they will hold moisture during the warmer months to save the water in my big arse water tank if we don't get alot of rain So, all in all, the car and house mods are going well, and I'm really enjoying being retired, I sleep in too 0700 and slowly plod around inside until I feel like actually doing anything, and only work in the yard for as long as want, which has actually been alot over the last few weeks,  although when you look at it, it seems that not a huge amount of work has been done,  until I look at the before I started the work pics Happy days and good times indeed 
    • hahaha yeah. Plan is to get side skirts and probably just rear pods. But going to do them one-by-one. I've got a set that I really like from RHDJapen, but that one isn't shipped to AU. So need to find someone who can get it for me
    • Here's an idea, answer the questions I asked you as they are trying to work out WHY the LSD will be binding up in a straight line.
    • You haven't driven many modern cars then have you? Most of them have sfa steering feel with their stupid electric bullshit steering systems.
×
×
  • Create New...