tom9999 Posted February 18, 2008 Share Posted February 18, 2008 hi guys, I recently have spun a big end bearing and i just want to know how to help prevent it from happening again. These were the mods when it happened:- ACL race bearings N1 oil pump blueprinted bottom end Castrol 5w-30 Is there anything i should do or is it just bad luck/motor not put together probably cheers Tom Link to comment https://www.sau.com.au/forums/topic/206613-r33-gtr/ Share on other sites More sharing options...
TommO Posted February 18, 2008 Share Posted February 18, 2008 Was it tracked? Any idea of there were oil control mods done to the motor? My understand is that bearings like that go due to lack of oil. Link to comment https://www.sau.com.au/forums/topic/206613-r33-gtr/#findComment-3654798 Share on other sites More sharing options...
tom9999 Posted February 18, 2008 Author Share Posted February 18, 2008 nah its just a street car and i dont know about oil control mods, what can you get???? its got 23,000km on the motor Link to comment https://www.sau.com.au/forums/topic/206613-r33-gtr/#findComment-3654959 Share on other sites More sharing options...
R338OY Posted February 18, 2008 Share Posted February 18, 2008 you can get a baffled sump. There's other stuff but i can't remember. GTR owners will know of the ins & outs of RB26 oil issues Hope you get it sorted mate. Link to comment https://www.sau.com.au/forums/topic/206613-r33-gtr/#findComment-3654973 Share on other sites More sharing options...
moobaque Posted February 18, 2008 Share Posted February 18, 2008 Getting a baffled sump will only help with keeping your oil cooler (but upgrading to an aftermarket sump will generally mean higher capacity which is a good thing) and your problem has stemmed from lack of oil. The simple fix is to overfill your oil 500ml - 1L above the full marker but this is generally just a precaution for track going vehicles. considering your car is street only id be wondering if there was some sort of blockage or your oil pump failure. This really shouldn't occur on a street only car. Link to comment https://www.sau.com.au/forums/topic/206613-r33-gtr/#findComment-3655137 Share on other sites More sharing options...
R338OY Posted February 18, 2008 Share Posted February 18, 2008 On that note i've heard of one GTR tracked with 8L of oil. Link to comment https://www.sau.com.au/forums/topic/206613-r33-gtr/#findComment-3655146 Share on other sites More sharing options...
Duncan Posted February 18, 2008 Share Posted February 18, 2008 if you haven't hit the track and you do regular oil changes, sounds like something wrong with assembly, although it did last a long time for that. Link to comment https://www.sau.com.au/forums/topic/206613-r33-gtr/#findComment-3655158 Share on other sites More sharing options...
Blitz Posted February 18, 2008 Share Posted February 18, 2008 Getting a baffled sump will only help with keeping your oil cooler (but upgrading to an aftermarket sump will generally mean higher capacity which is a good thing) and your problem has stemmed from lack of oil. The simple fix is to overfill your oil 500ml - 1L above the full marker but this is generally just a precaution for track going vehicles. considering your car is street only id be wondering if there was some sort of blockage or your oil pump failure. This really shouldn't occur on a street only car. Sorry, but you have missed the point of having a baffled sump - The point of the baffles isn't to keep your oil cooler, but rather to prevent oil starvation under hard cornering/load, which is particularly common at the track. Ideally, anyone building an engine should be at a minimum fitting sump baffles, a good quality oil cooler, and an upper oil gallery restrictor. Link to comment https://www.sau.com.au/forums/topic/206613-r33-gtr/#findComment-3655278 Share on other sites More sharing options...
tom9999 Posted February 18, 2008 Author Share Posted February 18, 2008 what oil should i be using to help prevent this happening again??? also would keeping the oil cooler help. what temperature should it be at?? Link to comment https://www.sau.com.au/forums/topic/206613-r33-gtr/#findComment-3655301 Share on other sites More sharing options...
Blitz Posted February 18, 2008 Share Posted February 18, 2008 what oil should i be using to help prevent this happening again??? also would keeping the oil cooler help. what temperature should it be at?? Yes, keeping the oil cool is a priority. Which oil you choose depends on your engine and its condition. If the oil gets too hot, it gets too thin and you will run the risk of spinning a bearing again. Personally I run Motul 300V Chrono, however given that my GTR takes 10 litres per change with my larger sump and cooler setup, it makes for expensive oil changes! An oil cooler really is a must have on a modified GTR. Link to comment https://www.sau.com.au/forums/topic/206613-r33-gtr/#findComment-3655326 Share on other sites More sharing options...
tom9999 Posted February 18, 2008 Author Share Posted February 18, 2008 yeh thought so i opened the oil cap and there was lots of steam???? and its was full Link to comment https://www.sau.com.au/forums/topic/206613-r33-gtr/#findComment-3655328 Share on other sites More sharing options...
Blitz Posted February 18, 2008 Share Posted February 18, 2008 yeh thought so i opened the oil cap and there was lots of steam???? and its was full Not good, what oil have you been using? How often are you changing it? Link to comment https://www.sau.com.au/forums/topic/206613-r33-gtr/#findComment-3655334 Share on other sites More sharing options...
tom9999 Posted February 18, 2008 Author Share Posted February 18, 2008 Castrol 5w-30, well i drove from melbourne to townsville and did a change asap and then 3 days later it went but usally 5000km Link to comment https://www.sau.com.au/forums/topic/206613-r33-gtr/#findComment-3655342 Share on other sites More sharing options...
Blitz Posted February 18, 2008 Share Posted February 18, 2008 Castrol 5w-30, well i drove from melbourne to townsville and did a change asap and then 3 days later it went but usally 5000km 5w-30?????????????????????????????? Link to comment https://www.sau.com.au/forums/topic/206613-r33-gtr/#findComment-3655368 Share on other sites More sharing options...
R31Nismoid Posted February 18, 2008 Share Posted February 18, 2008 IMO - Baffles - waste of money as its only fixing another problem indirectly. For a street GTR, with the RIGHT head modifications to stop the oil starvation in the first place... negates the need for a sump. Heavily tracked GTR's here (350rwkw style) ran stock sumps without problem, so can you for a street car Read the FI Guide (its a sticky), and in there it contains a link for Oil Control in RB's. If you get that right, and have it rebuilt correctly, there is no reason it should die. I would say your motor either wasn't assembled correctly or you ran low on oil at some point possibly. Likely bet is motor assembly. Castrol 10/60 is what i would be using in a built motor personally, been run in all of mine for the past 4 years, no issues 5/30 is probably part of the issue Link to comment https://www.sau.com.au/forums/topic/206613-r33-gtr/#findComment-3655372 Share on other sites More sharing options...
R34GTFOUR Posted February 18, 2008 Share Posted February 18, 2008 what power are you putting out?? what rods are you using? what rod bolts/studs are you using?? pushing big hp on stock rod bolts "can" stretch and lead to big end failures, although oil control problem are common in gtr's as stated A spun bigend on a 20k km built engine driven on the street = something very very wrong Link to comment https://www.sau.com.au/forums/topic/206613-r33-gtr/#findComment-3655410 Share on other sites More sharing options...
giant Posted February 18, 2008 Share Posted February 18, 2008 maybe oil pump let go?? had you revved it hard or big launch.? Link to comment https://www.sau.com.au/forums/topic/206613-r33-gtr/#findComment-3655473 Share on other sites More sharing options...
N1GTR Posted February 18, 2008 Share Posted February 18, 2008 Do you hit the rev limiter much? Link to comment https://www.sau.com.au/forums/topic/206613-r33-gtr/#findComment-3655604 Share on other sites More sharing options...
proengines Posted February 18, 2008 Share Posted February 18, 2008 Detonation/pre-ignition is probably the biggest killer of conrod bearings on GTR's when the boost is wound up. Most of the time you'll find there's no oil pump problem etc.. Have a look at the other conrod bearings, if they have marking on the upper bearing from 10 thru 1 o-clock it's usually a good sign of detonation. It happens because the mixture fires too early and the piston is pushed back down the bore while the crank is still trying to push it up, this squeezes out the oil film and you have metal on metal contact between the crank journal and the bearing. Link to comment https://www.sau.com.au/forums/topic/206613-r33-gtr/#findComment-3655710 Share on other sites More sharing options...
TTT Posted February 18, 2008 Share Posted February 18, 2008 Blitz - isn't 5-30 what the nissan recommendation is? and if it is a freshly rebuilt engine (20K kms), then is it really a problem? more info on what/when it happened would be good too. idling along freeay at 110kms or giving 1st and 2nd a good rogering? Link to comment https://www.sau.com.au/forums/topic/206613-r33-gtr/#findComment-3655886 Share on other sites More sharing options...
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