g-mack
Active Member
no haven't checked for splits. will do tomorrow!
other possible causes now?
1.dodgy air filter, will remove and drive tomorrow.
2 de laminating turbo hose??? would that make noise under load?
what about a valve not opening enough? slightly bent push rod, worn tappet guide or followers or worst still worn cam lobes. could that cause it?
other possible causes now?
1.dodgy air filter, will remove and drive tomorrow.
2 de laminating turbo hose??? would that make noise under load?
what about a valve not opening enough? slightly bent push rod, worn tappet guide or followers or worst still worn cam lobes. could that cause it?
g-mack
Active Member
right after a lot of removing filters taking pipes of etc etc im starting to think im just being paranoid about induction noise!. Im convinced my exhaust internals are knackered as it has a very deep boom and whilst sticking a brick on accelerator (in neutral of course) i spent ages walking around vehicle and climbing round inside. and the exhaust is definitely booming. so i will sort that out first and come back to this problem. if it is even a problem!
smbaker
Member
Possible the silencer internals are rotten and baffles are no longer !!
g-mack
Active Member
UPDATE:
replaced rear and center silencer with new allmakes items.
its a bit quieter BUT! the booming is STILL there!!
this is getting very irritating as its so uncomfortable driving it is so loud!
i suppose the next thing to replace is the front pipe!. the one that is on does not have flexi, its a straight pipe, so maybe i will try a flexi as that might reduce a few more vibrations too!
the tail pipe really does move alot when ticking over i would guess vibrates around 2" side to side! could be an engine moiunt but i don't get any vibes through either of the gear sticks!
replaced rear and center silencer with new allmakes items.
its a bit quieter BUT! the booming is STILL there!!
this is getting very irritating as its so uncomfortable driving it is so loud!
i suppose the next thing to replace is the front pipe!. the one that is on does not have flexi, its a straight pipe, so maybe i will try a flexi as that might reduce a few more vibrations too!
the tail pipe really does move alot when ticking over i would guess vibrates around 2" side to side! could be an engine moiunt but i don't get any vibes through either of the gear sticks!
I can't really hear anything that I'd describe as 'booming' in your original video?
There are really only two ways for an engine to make booming - induction or exhaust. If it's induction, then you need to look at what is not meeting the original design spec, because I think that you've got some sort of resonance going on. What's too stiff or too soft, wrong length or diameter. Engineers do spend a fair bit of time designing this stuff out - it's not pot luck.
You should also look for anything restricting the system, anything coming into contact with chassis/body/engine that might be changing the sound. As an example, think of a string on a violin and the enormous range of noise that it can make simply by changing the number of 'waves' in it. Same violin, same string, same tension in it. Just a different free length.
If you can capture the boom in another video it would help.
There are really only two ways for an engine to make booming - induction or exhaust. If it's induction, then you need to look at what is not meeting the original design spec, because I think that you've got some sort of resonance going on. What's too stiff or too soft, wrong length or diameter. Engineers do spend a fair bit of time designing this stuff out - it's not pot luck.
You should also look for anything restricting the system, anything coming into contact with chassis/body/engine that might be changing the sound. As an example, think of a string on a violin and the enormous range of noise that it can make simply by changing the number of 'waves' in it. Same violin, same string, same tension in it. Just a different free length.
If you can capture the boom in another video it would help.
g-mack
Active Member
you can only hear the booming when its moving and under load.
im gonna have a go at putting it in low first and driving with bonnet off and see if i can get a vid.
its rev dependent and must be under load to hear it, so im hoping being in low first will reduce any wind noise as i should be able to induce the boom at walking pace!!
im gonna have a go at putting it in low first and driving with bonnet off and see if i can get a vid.
its rev dependent and must be under load to hear it, so im hoping being in low first will reduce any wind noise as i should be able to induce the boom at walking pace!!
