3Katz Donating Members 121 Member For: 6y 2m 13d Posted 08/09/21 07:23 AM Share Posted 08/09/21 07:23 AM If any of you guys would like to offer your opinion on what this noise could be it would be appreciated. Please read before calling "hello Rodney" lol. Engine is torn down again at the moment and nothing stands out. BA block Stock crank balanced HP Junkie main girdle Powerbond balancer ARP balancer bolt ARP main studs ACL main bearings Scat H beam rods ACL big end bearings CP pistons 9:1 compression ratio BA head ARP head studs Cometic head gasket Pep-pro stainless valves Pac valve springs Atomic FG billet cams Atomic timing chain and guide kit Atomic crank sprocket Boundary oil pump gears and backing plate Yellaterra flex plate ARP flex plate to crank bolts ARP flex plate to convertor bolts GTX3582 19psi This noise appeared not long after run in, engine was pulled down as far as head off and checking big ends and main caps. Nothing noted but replaced big end bearings just because and reassembled. Noise was still there so pulled the engine out again pistons are removed - little ends good, big end bearings still perfect, all clearances within spec, rings and lands fine. Lifters appear fine. No witness marks on anything. Noise sounds like it's coming from the lower end towards 5 and 6 rather than the head but very hard to tell. All flex plate and t/c bolts tight. Have run engine without convertor installed to isolate trans and noise still there. Any guesses? A carton to whoever gets it, funds transferred via PayPal lol Link to comment Share on other sites More sharing options...
JETURBO ...JD TUNING ADELAIDE... Gold Donating Members 23,708 Member For: 15y 10m 18d Gender: Male Location: Adelaide Posted 08/09/21 08:48 AM Share Posted 08/09/21 08:48 AM Does the noice increase in rhythm with RPM ? Is the noise there when cold ? Is the noise louder or quieter when hot Is the noise always there or does it seem like it might go away for a revolution or two then come back ? Link to comment Share on other sites More sharing options...
Tom Tucker Donating Members 614 Member For: 4y 9m 19d Posted 08/09/21 10:54 AM Share Posted 08/09/21 10:54 AM It definitely doesn't sound good does it! Link to comment Share on other sites More sharing options...
Puffwagon Puff Gold Donating Members 15,115 Member For: 9y 2m 20d Gender: Male Location: South Australia Posted 08/09/21 11:00 AM Share Posted 08/09/21 11:00 AM Run it with the rocker cover off. Have a look first and if nothing jumps out at you, stick your finger on each of the rocker arms. You'll quickly find out if it's in the valve train. Link to comment Share on other sites More sharing options...
3Katz Donating Members 121 Member For: 6y 2m 13d Posted 08/09/21 11:23 AM Author Share Posted 08/09/21 11:23 AM To answer your questions: The noise does increase in rhythm with the rpm. The noise is there when cold however it's quieter, it then reaches its peak volume quite quickly as it warms up. The noise is loud before reaching full operating temperature. The noise does seem to come and go to a point - if you increase the rpm it becomes harder to hear (gets quieter?) then returns noticeably at idle, especially when the idle flicks with the a/c compressor cutting in/out. I have run with accessory belt off and noise still there. No it definitely does not sound good lol. It's actually stripped down at the moment and I've realised I should have posted this question prior to pulling it out again! It makes such a racquet I thought it would be easily spotted. Link to comment Share on other sites More sharing options...
Puffwagon Puff Gold Donating Members 15,115 Member For: 9y 2m 20d Gender: Male Location: South Australia Posted 08/09/21 11:37 AM Share Posted 08/09/21 11:37 AM Pull the valve springs off the head and check that the valve guide seals are still seated and that the top of a valve guide hasn't broken off. It can break and still run fine albeit with a noise, and you won't see it until it's apart cos the valve stem seal covers it. Link to comment Share on other sites More sharing options...
3Katz Donating Members 121 Member For: 6y 2m 13d Posted 08/09/21 12:50 PM Author Share Posted 08/09/21 12:50 PM Will do Puff, I'll report back on the valves and guides. Link to comment Share on other sites More sharing options...
3Katz Donating Members 121 Member For: 6y 2m 13d Posted 09/09/21 10:55 PM Author Share Posted 09/09/21 10:55 PM Springs, retainers, valves, guides and seals all good. The lifters were new when engine assembled the first time but might replace them because I'm really scratching for a cause of this noise. I've heard of (limited) issues with Atomic tensioners, could this sound possibly be related to an issue with the timing gear? Sounds like it's more associated with a particular cylinder to me, whether it be top end or bottom, but I'm happy to consider anything at this stage. If no one nails it there's still a carton to whoever is the closest 🍻 Link to comment Share on other sites More sharing options...
Bobs barramundi New Member 3 Member For: 2y 2m 22d Posted 27/01/22 08:50 AM Share Posted 27/01/22 08:50 AM Hey 3 katz matey did you end up working out what the problem is? as I got my car back from tuner after all the work done to it and I have same noise on cold start but is very faint on last 10 to 15 second Max and boom goes away, but note its not as loud as yours though. Link to comment Share on other sites More sharing options...
Puffwagon Puff Gold Donating Members 15,115 Member For: 9y 2m 20d Gender: Male Location: South Australia Posted 27/01/22 09:32 AM Share Posted 27/01/22 09:32 AM Comment just because... Sounds like piston slap. I'll trade the carton for a couple of goon bags Link to comment Share on other sites More sharing options...
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