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Rb25 Top End Noise - Help

evsr31

By evsr31,
in Engines & Forced Induction

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evsr31 Collaborator

evsr31

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Posted (edited)

Hi Guys,

Just installed my series 1 rb25det last night, and wired it up, little bit of a background this engine was bought low k's from an importer wrecker and was auto its whole life, and hasn't been run for a long time I'm assuming.

I've done every seal on the front end, as well as a gates timing belt, tensioner / idler bearing, and done rear main seal etc, had a forward facing plenum custom made and is securely fitted with gasket / sealant of course so no leaks there...

Injectors are stock rb25 injectors, I've only been able to put in around 1.5 litres of oil to see if it would run briefly, but when started it makes this tapping noise coming from the head...

I've looked at a few threads and think it could be a build up of air in the hydraulic lifters?

Or could this be to do with me changing the timing belt and maybe the crank pulley is flopping around? doubtful though as its secure.

It's really got me worried and countless hours have gone into this so hoping it's not the worst...

Video of sound -

http://s103.photobucket.com/albums/m137/dr...nt=19052009.flv

Also the ecu that was sold with the engine is buggered and wont ground to earth for the fuel pump to switch off, so I'm running my mates remapped rb20 ecu to suit rb25, which I was going to do anyway but still very frustrating.

Found this sound on youtube and seems pretty much exactly the same... any insight would be greatly appreciated.

http://www.youtube.com/watch?v=QrlJMbuTKJg

Thanks.

Edited by evsr31
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https://www.sau.com.au/forums/topic/270853-rb25-top-end-noise-help/
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Dale FZ1 Veteran

Dale FZ1

Posted
Posted

That's the way I read it too, thinking WTF?? Be interesting to have that clarified - I'm hoping his countless hours haven't been wasted by putting a thimble full of oil into the sump when it was going to need 4-5 litres?.

Without all the plumbing hooked up the vid seemed to show a lot of noise coming from the inlet side (valves opening and closing), compressor inlet, and exhaust. Bit hard to listen for lifter noise over all that, but you'd nearly have to expect a bit of bleed-out if it has been sitting for some time. Then again, if it's got no/low oil pressure the noise might be something else.

evsr31 Collaborator

evsr31

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Wasn't a good idea to run with 1.5 - 2 litres in the engine, just wanted to see if it started and only ran it for 30 seconds if that... which u can see in the vid.

Tapping was just because it had been sitting around for a long time, and the head was dry, maybe a bit of air in the hydraulic lifters too...

Dumped what was in there and filled her up tonight, no tapping, sounds brilliant.

Cjmartz2k Proficient

Cjmartz2k

Posted
Posted

So you actually did start it with only 1.5L in it??????? It doesn't matter how long you did or did not run it for. Not enough oil can turd your motor instantly. Wow, that's amazing. You'll be lucky if you didn't trash the motor. I can't see your video since it's blocked from work BTW, but I'm sure as hell going to look at it now when I get home.

This has to be one of the most retarded things I've ever heard of, and you actually posted up a "help me" thread about it?? Priceless :laughing-smiley-014:

evsr31 Collaborator

evsr31

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Err there must have been more in there before putting in the 1.5 litres, as oil had been lifted to the head...

Highly doubt it would have caused any damage, as it did have some in it, before I put the 1.5 in, definitely enough for the oil pick up to catch.

How can you say that before the engine gets hot that there will be huge amounts of heat and friction, yeah silly I know this but figured it would be safeish to run for a short period of time, very short obviously.

I posted this thread to find out if it was typical of an rb25 to have top end noise when it hasn't been run for quite some time, not to get flamed, or have sarcastic / pessimistic replies, guess I can expect that from some on SAU.

Edited by evsr31

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