bigpig
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| posted on 27/9/09 at 03:26 PM |
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Dampening engine bay noise
Well I'm in the process of finding out what all the excessive noise is in my Pinto. Even with an R1 can on its around 101 db.
I'm running CBR600 carbs with a pipercross foam filter. Its pretty quiet on that side with the choke in.
The noise in the engine bay seems to be from the rocker box. I've checked the tappet e.t.c and they are all fine. I just think its a noisey
engine. I've put some of those heat mats in but they just made the bonnet heavier.
As its a MK its only got fibre glass side pannels so my first thought is ally pannels on the inside of these. Any other suggestions?
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twybrow
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| posted on 27/9/09 at 04:01 PM |
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Make sure none of your panels vibrate. I stuck foam (camping mattress style) under my bonnet - weighs beggar all, but damps very nicely. With my
borrowed db meter it dropped 1-2db.
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RichardK
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| posted on 27/9/09 at 04:02 PM |
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Have you checked the cam shaft timing? Could be a cause of a rattle, when that's bob on, recheck ign timing.
Cheers
Rich
[Edited on 27/9/09 by RichardK]
Gallery updated 11/01/2011
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speedyxjs
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| posted on 27/9/09 at 04:36 PM |
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Iv been thinking about doing the same thing with my loud engine but am abit worried about the potential heat increase.
How long can i resist the temptation to drop a V8 in?
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bigpig
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| posted on 27/9/09 at 05:09 PM |
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Hi,
The cam is standard Pinto one. There is a bit of wear on lobe #3 due to the inlet tappet being originally wound all the way off and the exhaust being
loose.
The ignition timing is set to 8deg BTDC ( approx), no vac pipe disconnected, as suggested in the ford manual.
I was thinking of getting some dedening material from say inside a sharan and making a nice rocker box hat. This is under the assuption that its flame
retardant and that if its a good fit, there shouldn't be enough heat on the rocker box to start a fire.
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MakeEverything
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| posted on 27/9/09 at 05:12 PM |
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quote:
Originally posted by speedyxjs
Iv been thinking about doing the same thing with my loud engine but am abit worried about the potential heat increase.
Speedy, i think if you do try and muffle it too much, youll take away more of the personality of the build??
With your particular project, it wouldnt feel right if it werent uncomfortable to drive, controversial, or causing aruments with track day scrutineers
[Edited on 27/9/09 by MakeEverything]
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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RichardK
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| posted on 27/9/09 at 05:18 PM |
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quote:
Originally posted by bigpig
Hi,
The cam is standard Pinto one. There is a bit of wear on lobe #3 due to the inlet tappet being originally wound all the way off and the exhaust being
loose.
The ignition timing is set to 8deg BTDC ( approx), no vac pipe disconnected, as suggested in the ford manual.
I was thinking of getting some dedening material from say inside a sharan and making a nice rocker box hat. This is under the assuption that its flame
retardant and that if its a good fit, there shouldn't be enough heat on the rocker box to start a fire.
I believe David Boggs recommends 10 degrees, u2u wrigglypig as he has just had his to Boggs, I know I running 14 degrees on mine but I have a fast
road cam in mine.
Cheers
Rich
Gallery updated 11/01/2011
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speedyxjs
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| posted on 29/9/09 at 08:24 PM |
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quote:
Originally posted by MakeEverything
quote:
Originally posted by speedyxjs
Iv been thinking about doing the same thing with my loud engine but am abit worried about the potential heat increase.
Speedy, i think if you do try and muffle it too much, youll take away more of the personality of the build??
With your particular project, it wouldnt feel right if it werent uncomfortable to drive, controversial, or causing aruments with track day scrutineers
[Edited on 27/9/09 by MakeEverything]
How long can i resist the temptation to drop a V8 in?
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bigpig
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| posted on 1/10/09 at 05:00 PM |
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Well I got hold of come peugot 206 diesel felt from a breakers for the price of a contribution to the tea fund.
Layered up 3 times above the rocker box seems to have worked quite well. I'm just peaking over 99dba in the garage, which hopefully in the open
should be about it.
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fatbaldbloke
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| posted on 1/10/09 at 05:07 PM |
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On a sort of related topic I have a Zetec with a Dunnell big bore exhaust and whilst it sounds great outside, the noise inside the car is loud. I
have to wear ear plugs to drive for any distance. I was wondering if the noise is being radiated off the primaries and whether exhaust wrap until the
exhaust exits the side of the engine bay would help. Does anybody have any experience?
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