Jump to content


HI PSI

Desperately Need Help - New Built Engine With Strange Sound.

Recommended Posts

Hi all,

a good friend has a rather peculiar sound coming form his freshly built engine. The sounds seems to occur at around 3,000 to 3,300 rpm. He is at his wits end with trying to diagnose and fix the noise. Given this, the owner has gone to extraordinary measures to try and identify the issue, all with no avail. As he has exhausted every idea possible, he requested that I create this thread in the hope that other may assist in its identification and rectification.

History:

The car has been built with quality components, with no expense has been spared. The engine was rebuilt (at great cost) around 7 months ago by a reputable engine builder who is based in South East Queensland. The engine ran for three days, before the intake valves smashed into the pistons and cracked the head casting.

A new cylinder head was built (By the same Engine builder) and has just been fitted to the bottom end. Ever since the car has been making this "Rattling sound". The said engine builder was consulted and his advice constituted of: "It's fine, just run it. But, there is no warranty if it "blows up". As you could well understand (And you will after you view the video posted below), and given the time and money taken to complete the build, the owner is not happy with this advice and lack of support. He has now taken matters into his own hands and has surrounded himself with very experienced and knowledgeable people. That given, the source has not yet been found. He described it as being related to, or affecting the timing chain, as if extra tension os placed on the chain, the sound commences at a higher rev range.

To date, they have:

  • Replaced timing chain, guides, tensioner
  • Replaced cams, vernier gears
  • Removed Jesel rockers and replaced with factory units
  • Removed solid lifters and replaced with hydraulic lifters.
  • Removed cams and checked for straightness and tolerances. timing chain
  • Removed VCT actuators and fabricated a billet relpacements which fed additional oil onto the timing chain. etc

There are no evidence or telltale markings of any kind to suggest rubbing or anything untoward.

Any advice or assistance would be greatly appreciated.

The owner would greatly appreciate it, if the thread could maintain focus on the problem. At this point in time, he would like to keep all emotion out of it, as he just wants to find and fix the issue.

https://youtu.be/kYpgbLsMIQU

MOV_4338_1.mpg

Edited by HI PSI

Share this post


Link to post
Share on other sites

Only happens over a 300-400 rpm range, starting at 3,000rpm, then disappears. If he places extra tension on the chain, it moves further up the rev range.

Edited by HI PSI

Share this post


Link to post
Share on other sites

Auto or manual

We had a similar noise with our Nizpro engine in exactly the same rev range. There seems to be a resonance at that RPM that amplify noises. For us it ended up being exhaust related , but took ages to diagnoses as it definitely appeared to be coming from the engine. SO this noise may NOT be actually coming from the engine. Noise travels strangely through different components and metals.

Very hard to diagnose from the short video.

Edited by arronm

Share this post


Link to post
Share on other sites

Is said engine builder located in toowoomba by any chance?

At this point in time, the owner will not disclose any information regarding the shop involved.

Share this post


Link to post
Share on other sites

What brand timing gear has been used? Atomic?

I'm not certain. However, I think that this is the case. I will ask him tomorrow. :D

Share this post


Link to post
Share on other sites

Im not sayin im 100% sure on what it could be but if it is a certain builder and it was done a little while ago I wouldnt be surprised if it has a cheap nason timing set in it which is guides, tensioner and chain which you can pick up for 140 bucks. A couple chains have failed and tensioners. I would find out asap whats been fitted as they were fitting these timing kits to 10k long motors.

Share this post


Link to post
Share on other sites

Im not sayin im 100% sure on what it could be but if it is a certain builder and it was done a little while ago I wouldnt be surprised if it has a cheap nason timing set in it which is guides, tensioner and chain which you can pick up for 140 bucks. A couple chains have failed and tensioners. I would find out asap whats been fitted as they were fitting these timing kits to 10k long motors.

New chain, guides, tensioner and lash absorber have been replaced since... Only quality units have been used.

Edited by HI PSI

Share this post


Link to post
Share on other sites

Yeah I read that but was wondering if they've been replaced it with atomic chain, tensioner and genuine guides or another sh*t nason timing kit which includes guides, chain and tensioner which have been known to fail.

Share this post


Link to post
Share on other sites

Yeah I read that but was wondering if they've been replaced it with atomic chain, tensioner and genuine guides or another sh*t nason timing kit which includes guides, chain and tensioner which have been known to fail.

No problem. Nice to know about the Nason chains though.... I'm sure that others will now be wary also :ok:

Edited by HI PSI

Share this post


Link to post
Share on other sites

Tony does not use nason any more so why would he replace it with another nason kit. Think him and palo learnt a lesson after his tensioner failed then when the chain snapped..

Share this post


Link to post
Share on other sites

Hence why I mentioned eariler, if it was rebuilt a little while back it could have nason gear in it. If it was a few weeks ago then happy days it wont have naso.n gear in it. And I never mentioned any names nor did the poster.

Share this post


Link to post
Share on other sites

Not hard to work out who you are talking about mate.. Is this spiros old car HI PSI??

Edited by CHLAXN

Share this post


Link to post
Share on other sites

Yeah well you can assume that. Im not havin a go but just informing ol mate of nason crap. I know he no longer uses it due to previous faults. We dont know the previous build times of this motor and whats been used hence my comment.

Edited by matt036

Share this post


Link to post
Share on other sites

Take the weight off the RH engine mount with an Engine crane and see if the noise changes. Doesn't sound internal to me. As Double R Ron mentioned I think it sounds like resonance being transferred into the chassic

Share this post


Link to post
Share on other sites

Take the weight off the RH engine mount with an Engine crane and see if the noise changes. Doesn't sound internal to me. As Double R Ron mentioned I think it sounds like resonance being transferred into the chassic

I will pass this on. Believe me when I say that he will try almost anything.......

He indicated that it seems to be coming from around the front of the rocker cover.... It is strange that it moves up the rev range when extra tension is placed on the timing chain though....

Share this post


Link to post
Share on other sites

Does it have solid/poly engine mounts? They send noises in all sorts of weird places. The only other noise that springs to mind that sounds similar is an Unhappy pump, but since you have tried it without the belt it rules out the PS and Water pump......what mods have been done to the Oil pump?

Share this post


Link to post
Share on other sites

Yes it is.

Yeah thought so can understand why he would be pulling his hair out mate.. Seen the motor a few months back while I was getting oil for mine. Really hope he can get it sorted ASAP and with no warranty I don't blame him being paranoid about it.

Share this post


Link to post
Share on other sites

Does it have solid/poly engine mounts? They send noises in all sorts of weird places. The only other noise that springs to mind that sounds similar is an Unhappy pump, but since you have tried it without the belt it rules out the PS and Water pump......what mods have been done to the Oil pump?

Does it have solid/poly engine mounts? They send noises in all sorts of weird places.

I don't know which mounts he is using, I will enquire tomorrow and post the results.

what mods have been done to the Oil pump?

It's dry sumped. from memory it is a Peterson.

Edited by HI PSI

Share this post


Link to post
Share on other sites

Check for hoses from the oil pump touching something else. The videos sound's not the best but it sounds like a hydraulic (ie oil pump) buzz to me.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Recently Browsing   0 members

    No registered users viewing this page.

  • Donation Box

    Please donate to support the community.
    We appreciate all donations!


FordXR6Turbo.com Powered by Invision Community

×