Rb26 Rod knock?

[BoostedSedan]

Hey guys thought id post this up and see if you guys are hearing it too.  I feel like there is a faint rod knock going on.  Or maybe im just hearing things.

 

the engine has 188km's on it, early model rb 1990, bone stock when I received it... not sure how hard the car was driven in the past.  I am currently running Redline 5w-40 in it.

 

thanks 

 

https://youtu.be/2Fl2xR64F-E

 

Edited March 27, 2018 by BoostedSedan

[Rusty Nuts]

Watched/Listened to that vid, can't say I can hear rod Knock, could hear valve train working. Have you tried stethoscoping around the engine or long screwdriver to ear. If you hear a dull knock that way. remove ignitor to that cylinder and listen again if knock gone well you know its that cylinder. But my old ears could not hear anything tearing itself apart in the vid. Got my fingers crossed its your brain screwing with you. I personally run 10w/40 semi synth the original oil for these motors was 20w/50 which was the good oil in the early 90's. In Oz its hot all year round by Japanese standards I dont know where in USA you are, oil can make a difference at idle of course.  Wishing you a good outcome. 

[GTSBoy]

I also hear nothing.

I would not run a 5W oil in any engine that old.  But......keep in mind that we're talking about multi-grade oils here, which is why the post by Rusty Nuts above needs some tweaking.  At engine operating temperature (say 90°C in the oil) the winter rating on the oil (the 5, or 10 or 20) is not important.  Only the larger number matters.  And any 2 40 grade oils will be very similar in viscosity at the same temperature.  And if you look very closely, there's very little difference between a 40 and a 50 at operating temperature either.  There's enough that OEMs will look to use thinner oils to try to improve their fuel efficiency numbers, and in fact that is really the only drive to 5W and 0W oils, so that the startup lubrication is faster and heats up quicker.  It's all about emissions.  An older motor that has some slop in it is not going to like really light weight oils at startup because they won't necessarily offer the pressure required to keep the bearings unstuck and you can damage your motor a little every time you start it cold.

[Rusty Nuts]

Agree with all, tweak away, Just a little worried he lives in Anchorage. I should have said my new build engine uses 10W/40. I would have no qualms using 20W/50. But i'm also an oil change fanatic, cheapest insurance on wheels.

[GTSBoy]

I'd guess that a GTR in Anchorage would be a summer car anyway.

[Rusty Nuts]

July is the hottest month in Anchorage with an average temperature of 58°F (15°C) and the coldest is December at 18°F (-8°C). 15 celcius  is not exactly warm and morning start temp is around 11, but he doesn't live there anyway.

[BoostedSedan]

Thanks for the replys guys,  i used to run 20w-50 in my rb20 back in the day..  im debating on going back to that now on this 26, like you guys mentioned 5w-40 is probobly not the best choice.

 

 

I have done the screwdriver to the engine method.  Nothing heard.   Im in Seattle WA. Might as well be Anchorage though!!

 

got my massive part order in from Osaka!

 

 

Edited March 28, 2018 by BoostedSedan

[GTSBoy]

I wouldn't take an R32 GTR out into Seattle traffic.  My impressions from driving there are that the locals can only drive when it's overcast and dry.  If,

• It rains, they crash.
• It snows, they crash.
• It ices, they crash.
• The sun comes out, they crash.  Must be because it's such a rare event and it startles them.

Factor in the large number of Jeeps and other weapons of mass destruction and I'd be garaging the car at the base of the mountain and never taking it out on metro streets!

[Rusty Nuts]

I had no problems when I worked in North Plains, Oregon, my mate Dave and I drove an old Chevy V8 regularly up to Seattle, The locals were ok drivers, don't personally understand their obsession with the freeways, we made some very fast trips avoiding them. Had an awesome adrenaline flowing drive down Mt St Helens behind a snow plough driven by a guy with massive nuts. Mind you for weeks we would pull out of work ,with a couple of local yanks on board, onto the left side of the road then swerve back onto the right when they started screaming, it never got old. 

[GTSBoy]

Hah!  I found myself driving the wrong way down Jeffcott St in North Adelaide on the weekend.  Pulled out of the swimming centre carpark with no other traffic on the road to key me into a RHD world.  Approaching the traffic lights from the wrong side, wondering how I was going to do a right turn into what I knew was the left turn lane on Park Terrace.  And I've been in Australia continuously for the last 2 months.  It's amazing how fried your brain can become from switching side of the road so often!

[Rusty Nuts]

My dear wife always bragged she felt so safe when I was driving,  until I drove off the ferry in Calais on the correct side of the road then went the wrong way round the first roundabout we encountered and I was driving a left hand drive...total brainfart.