Jump to content
SAU Community

Recommended Posts

old oil stank of petrol and had about a litre too much in, bear in mind i run twin pumps and 1000cc sards. wont take long at 8.0.1 afr to do that.was changed after afr set and prior to dyno run,car was never driven with the contaminated oil in the motor

sounds very bad to me.....fuel is a rubbish lubriant, almost as bad as coolant :D

but assuming you changed it, most of it was removed (no oil cooler?), and the problem was fixed that may not be it.....you don't have the oil that just came out of it?

  • Replies 76
  • Created
  • Last Reply

Top Posters In This Topic

right guys a further development. looks like we have looking in the wrong place. i now suspect something has gone through the engine.from where i am not sure. below are pictures of the head on number 5 the one that spun and number 5 piston crown,, i was running a 1mm headgasket. question is whatever caused these marks would it be enoug on a 1mm gasket to jam the piston enough to cause the crank to hit the bearing momentarily?.

IMG_0651.jpg

IMG_0652.jpg

IMG_0649.jpg

IMG_0648.jpg

i have stripped the turbo, nothing wrong there?. had a look in the exhaust there is some very small shiny magnetic fragments?. any idea where something that could do this had got in from..

The indentations look a lot like spark plug electrode mate.

I once left mine at a "reputable" tuner for dyno-ing after a forged rebuild and was not happy with the results, (less power everywhere with higher specs) and after lots of head scratching I pulled it out and found the pricks had melted plugs in it (dash 8's) and simply put new ones in it and gave it back to me.

yeah +1 for detonation.

would also explain why the bearing has gone on no5 too.

You would think it would be across the board but and evident in all cylinders. I suppose if no5 injector had issues there's a possibility.

What do the other cylinders looke like?

odd thought... but had you used a die grinder on or near your intercooler piping or anything that would have been open on the intake setup weather it be plenum, TB, ic piping, comp housing, intake pipe....

that pitting either looks like the result of ceramic bits off a sparkplug or metal filings from something not being cleaned properly after working on it..

hi Cartman, no mate if i ever do anything like that the cars is not in the garage, you can see some die grinding work on the head in the pics, i have over the weekend fully ported and polished the head. its away now for a light skim. now the piston tops are cleaned of they almost look as good as the day they went in..lol

all the valve guides in 1 piece? ive seen the inlets fracture and do similar damage.

that wont be the cause of the damage. its not detonation.

to only dammage 1 bearing its only oil contanimation. fron the look of it something has been sitting in the crank and got loosed. did you have the crank grubscrewed when it was first built?

of have you recently put on a oil cooler?

hi t04gtr

cars has always had a 19row oil cooler fitted.feedsin the top and drain at the bottom, the oil filter is mounted low on a remote so when you do and oil change the cooler empties too.

no grub screw mate, collar was sweated on and has never moved

no valve guides damaged at all.

i find it hard to believe det after looking at the pistons..

still wondering why?.

bernie

If you had lost an engine at 900klm you would feel the same way as Marko. The engine in question was a low revving item that was never put under stress...N1 went bang.

GTRNUR...correct...the mains are all shiny from eating rod bearing material.

So what kind of revs was it pulling and under what circumstances did it go bang? Drag/circuit?

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



  • Latest Posts

    • ADHD in all form isn't about "can focus, or can't focus" or is hyper active or isn't etc.   It's all a dysregulation. Either time feels to be stationary, or time just vanishes in a split second. We are either under focussed on the task at hand (as we're over focussed on our surroundings) or we have no idea an atomic bomb went off beside us as we're so hyper focussed and locked in on things.   Not to mention the rapid fire thought process. What it takes a "normal" process to think up a solution to a problem, ADHD will be able to give you 5 different ways to solve the problem, and the pros and cons of each. While we can be highly impulsive and lack the ability to "control ourselves" we can also become paralysed with the inability to make a decision for ourselves. While most of us have an OCD like requirement for perfection, we lack the ability often to remain focussed to get things to a perfect state. Those with undiagnosed ADHD as adults, can often find the last part actually stops them ever attempting to do things that they have the ability to do, as the reasoning is often "if I can't do it perfectly, it's not worth doing"   As for projects... Ha ha ha, I still need to take the other half of my wall trim down in the Fiance's office so I can paint it. Need to finish digging and running the back yard drains, my R33, getting the Ninja bike registered (now being sold), the moped project, fixing either of the lawn mowers so they're reliable, along with a myriad of other things.   It's why I've been going through lately and just being brutal and clearing projects off that I won't actually ever complete. IE, moped will go to the tip, or be given away, bike is being sold, Subaru project being sold, some parts for other projects given away. Or I've been making myself focus on one thing at a time, by ticking off the smallest quickest ones first.   There's also a reason by our mid twenties we seem to be "know it alls", as we've all been down some of the weirdest and oddest rabbit holes when you follow the dopamine trail. It's often also why we're more a jack of all trades, but not a master of one.   However, pretty much all of my hobby projects, in one way or another, all come back around to automotive. That's my zen area.
    • Remember reading about this not too long ago. been for sale for a long time  this is like when the wife says you need to sell the car so you put it up for a ridiculous price no one will pay
    • You are perhaps suggesting that it is not a super car? Well....it's not an AU.
    • Dropped the MX5 of this morning to get the hardtop colour matched and some PDR done, they are also going to give it a buff to remove some "stubborn" swirl marks and light scratches in the clear coat Over the last few months the poor little thing has copped some shopping centre car park abuse, I try to not park in them, but hitting Westfield's a few times over the last few months has taken its toll, nothing really bad, but enough of a trigger for a "while we're in there" thingie  Once it's back and all the one colour, with a few dents and mark's removed I'll give some of these products a go and see what they're like  
×
×
  • Create New...