KKtrips Posted February 9, 2010 Share Posted February 9, 2010 15w-50 ain't really that thick an oil though.. 5w is a bit carried away IMO.. Quote Link to comment Share on other sites More sharing options...
mark105 Posted February 9, 2010 Author Share Posted February 9, 2010 i was just informed on skylinesdownunder than 10W is supposed to be the thickest you should go for nissan hydro lifters. i am also going to re clean and re flush my lifters to see if this helps and change my oil. Quote Link to comment Share on other sites More sharing options...
fuel Posted February 9, 2010 Share Posted February 9, 2010 it's not that thick but it is a bit thicker than your usual 10W40 or 5W30 etc. Quote Link to comment Share on other sites More sharing options...
Unclejake Posted February 9, 2010 Share Posted February 9, 2010 The wrong oil viscosity will cause the lifters to pump up when thrashed on a race track. After 10 mins at idle that isn't possible. And given that the other 5(?) pots have compression you can rule oil out. 10-5: If your leakdown test is pointing to #1 inlet then keep looking there. A sticky bucket would do it on an OHC motor but if you have hydraulic lifters then I assume you don't have buckets and shims. If the valve stem to "rocker/cam" clearance is correct cold then check it again hot. Use the old HG. It will be fine. I do not know RB engines nor their valve train arrangement so I can not be of much help except to say: You should have put pushrods in it (all of the same length). The only other thing I can think of is that #1 piston is the wrong size but even then you should see some compression. Check the cam for a missing lobe. Is there fuel in the oil? One more thing: Compression will be zero if no air is getting INTO the cylinder. Got throttle bodies? Yuh. I am smoking kingfish with manuka logs. It is fun to be me. Quote Link to comment Share on other sites More sharing options...
kyteler Posted February 9, 2010 Share Posted February 9, 2010 Non-26 RB's run a single TB inlet plenum, so if 2-6 is getting air, then 1 sure as shit better be. Unless of course, there is something stuck in the runner to 1? Quote Link to comment Share on other sites More sharing options...
Unclejake Posted February 9, 2010 Share Posted February 9, 2010 ^ what is the cam/valve train arrangement? Twin OHC with rockers or one cam withe lifters etc. etc. etc. Fucking metric............. Quote Link to comment Share on other sites More sharing options...
mark105 Posted February 9, 2010 Author Share Posted February 9, 2010 whats this rockers stuff. twin ohc with cam acting on hydro lifter and hydro lifter acting on valve. Quote Link to comment Share on other sites More sharing options...
fuel Posted February 9, 2010 Share Posted February 9, 2010 yeah but does the cam actuate a rocker arm which on end operates the valve and the other end is attached to the hydraulic lifter seated in the head, or does the cam actuate a bucket with a hydraulic lifter seated between the valve and the bucket? SRs are the former. *edit* just saw your build thread, it's the latter Quote Link to comment Share on other sites More sharing options...
Unclejake Posted February 9, 2010 Share Posted February 9, 2010 Smack something with a hammer. That always helps. If your lash is good then take a look at that #1 inlet lifter/bucket and the exhaust side too. This is a phyisics problem. Either no air is getting in or all the air is getting out. A rag down the inlet tract on #1 would do it too Much lubs. Pushrods! Quote Link to comment Share on other sites More sharing options...
drftnmaz Posted February 11, 2010 Share Posted February 11, 2010 not a blockage in the oil feed/return causing the lifters to stay pumped up? i'd change the lifters from cyc 1 into cyc 2, reassemble with old gasket and test them all, see if problem moves or both are now not working etc? Quote Link to comment Share on other sites More sharing options...
nick_m Posted February 11, 2010 Share Posted February 11, 2010 Have you tried bleeding the hydraulic lifters? Would be interesting to see if the problem has changed cylinders as I bet the engine builder probably didn't put the same lifters in the same place, if it still on number one cylinder maybe try swapping the lifters to another cylinder and see if the problem follows it. Quote Link to comment Share on other sites More sharing options...
KKtrips Posted February 11, 2010 Share Posted February 11, 2010 i was just informed on skylinesdownunder than 10W is supposed to be the thickest you should go for nissan hydro lifters.i am also going to re clean and re flush my lifters to see if this helps and change my oil. When I was servicing vehicles I used 20W 50 on Skylines when the customer asked for a budget lube.. Never had any issues or comebacks - maybe 10W is recommneded but I don't see it causing a lifter to pump up to the extent of causing zero compression (the valve needs to be open a reasonable amount to bleed that much compression out..) I am not even sure it is a lifter but where does the oil drain from the lifter, the oil will need somewhere to go - check the drain is clear for all the number 1 valves.. I have a few more suggestions to try but rather than confuse things more - just try some of the suggestions already put forward and then come back if no joy.. Quote Link to comment Share on other sites More sharing options...
Spencer Posted February 11, 2010 Share Posted February 11, 2010 something like that should fix it Quote Link to comment Share on other sites More sharing options...
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