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07-04-2010, 05:20 PM
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CC Member
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Join Date: Jun 2007
Location: Sunshine Coast Qld,
QLD
Cobra Make, Engine: Harrison # 80; Ford 5.0L HO Trickflow heads, cam and rockers and MassFlow EFI
Posts: 3,482
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Not Ranked
Testing F1 engine
Trevor Wright (Buderim) sent me this one. Check out the guy on the right! If he is not deaf already, he will be ...
http://www.youtube.com/watch?v=gSHToyGIxWE
__________________
Merv
Ford Cobra
Harrison #80.
Peregian Beach
Sunshine Coast Qld.
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07-04-2010, 07:39 PM
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CC Member
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Join Date: Aug 2008
Location: airlie beach / mackay,
QLD
Cobra Make, Engine: Some kind of FORD thingy, with several pis tins, twin chain driven SUs feeding a Y block, apparently.
Posts: 501
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Not Ranked
hes wearing protection, they all would be, look closer.
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Nuts,,, Bolts,,, and 2 smoking barrels. 
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07-04-2010, 07:59 PM
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CC Member
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Join Date: Dec 2004
Location: toronto,
ont
Cobra Make, Engine: 408w 500 h.p. 550 ft.lbs
Posts: 562
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Not Ranked
Yes he is ----But the guy on the left rear isn't, nor are a lot of the others. 
Hence the fingers in the ears.  |
07-04-2010, 08:13 PM
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CC Member
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Join Date: Aug 2008
Location: airlie beach / mackay,
QLD
Cobra Make, Engine: Some kind of FORD thingy, with several pis tins, twin chain driven SUs feeding a Y block, apparently.
Posts: 501
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Not Ranked
they could be wearing screw plugs in their ears, like i do at work, which you cant see
__________________
Nuts,,, Bolts,,, and 2 smoking barrels.
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07-04-2010, 08:29 PM
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CC Member
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Join Date: Jun 2007
Location: Sunshine Coast Qld,
QLD
Cobra Make, Engine: Harrison # 80; Ford 5.0L HO Trickflow heads, cam and rockers and MassFlow EFI
Posts: 3,482
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Not Ranked
Those plugs attenuate (both intensity and frequency) very poorly on the acoustic evidence and the cup/muff type protectors are by far the better.
__________________
Merv
Ford Cobra
Harrison #80.
Peregian Beach
Sunshine Coast Qld.
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07-04-2010, 10:47 PM
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CC Member
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Join Date: Oct 2008
Location: Perth,
WA
Cobra Make, Engine: G-Force Mk1, LS1, T56, Jag S3 suspension
Posts: 587
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Not Ranked
Where are the marshmallows?
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07-04-2010, 11:17 PM
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CC Member
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Join Date: Jun 2007
Location: Sunshine Coast Qld,
QLD
Cobra Make, Engine: Harrison # 80; Ford 5.0L HO Trickflow heads, cam and rockers and MassFlow EFI
Posts: 3,482
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Not Ranked
Tough guys and tough ears. Never heard of permanent threshold shift.
__________________
Merv
Ford Cobra
Harrison #80.
Peregian Beach
Sunshine Coast Qld.
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07-05-2010, 12:09 AM
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CC Member
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Join Date: Jun 2010
Cobra Make, Engine:
Posts: 21
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Not Ranked
Its the Arrows Walkinshaw team.
It was abit of fun after they found out that Tom was bankrupt!!
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07-05-2010, 12:39 AM
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CC Member
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Join Date: Aug 2009
Location: Atlanta,
GA
Cobra Make, Engine: 86 Everett Morrison 90" WB. 428 FE
Posts: 1,151
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Not Ranked
Quote:
Originally Posted by Merv and Sharon
Those plugs attenuate (both intensity and frequency) very poorly on the acoustic evidence and the cup/muff type protectors are by far the better.
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My employer has always told us the plug cancels more DB's then muffs. But even better wear both. |
07-05-2010, 05:08 AM
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CC Member
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Join Date: Jun 2007
Location: Sunshine Coast Qld,
QLD
Cobra Make, Engine: Harrison # 80; Ford 5.0L HO Trickflow heads, cam and rockers and MassFlow EFI
Posts: 3,482
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Not Ranked
Your employer is wrong Ralphy. The problem with most plugs is that they are not individually moulded (disposables) and also if they they are well made and then fit really you well and fully occlude, you can hear little speech from other workers. Muffs cover a greater range of frequencies and give greater protection but they need to be good ones as well. They are also not very comfortable. Both could be good!
__________________
Merv
Ford Cobra
Harrison #80.
Peregian Beach
Sunshine Coast Qld.
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07-05-2010, 03:34 PM
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CC Member
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Join Date: Feb 2010
Posts: 76
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Not Ranked
Quote:
Originally Posted by Merv and Sharon
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I think I can see he has earplugs ? Orange chords on them. |
07-05-2010, 03:36 PM
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CC Member
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Join Date: Feb 2010
Posts: 76
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Not Ranked
Quote:
Originally Posted by andyl
I think I can see he has earplugs ? Orange chords on them.
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Ooops sorry, when I replied there were no replies but for some reason it now shows plenty saying the same thing before mine :s |
07-05-2010, 03:54 PM
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Senior Club Cobra Member
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Join Date: Jul 2002
Cobra Make, Engine:
Posts: 15,712
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Not Ranked
The typical ear plug drops the DB by about 30, not taking into account the range and other factors, just a general statement. Many plugs do less. Depending on how much noise is in the environment 30 DB down from that will help, but it may not be enough to prevent damage. DB at a given level for a given time (there are charts) will do damage. The louder it is, the shorter the time.
I wear ear muffs when I'm working, I think they are better, and the very best ear plugs I can find when I'm driving the Cobra.
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07-05-2010, 11:41 PM
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CC Member
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Join Date: Aug 2009
Location: Atlanta,
GA
Cobra Make, Engine: 86 Everett Morrison 90" WB. 428 FE
Posts: 1,151
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Not Ranked
Merv the problem with muffs are getting a 100% seal. Wearing glasses or your hair breaks the seal. Also they never seem to compress evenly around your ear. Not looking to argue, heck I wear muffs myself almost 100% when I do wear ear protection.
Looking at the chart we are both right, depends what frequency. But your more correct!
http://www.audiologyonline.com/artic...article_id=296
Last edited by Ralphy; 07-05-2010 at 11:46 PM..
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07-06-2010, 01:34 AM
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CC Member
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Join Date: Jun 2007
Location: Sunshine Coast Qld,
QLD
Cobra Make, Engine: Harrison # 80; Ford 5.0L HO Trickflow heads, cam and rockers and MassFlow EFI
Posts: 3,482
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Not Ranked
Yes Ralph, the ear muffs (cup type with soft edges to accommodate glasses, etc.) are best but the real damage was always thought to be high frequency noise as it damages the hair cells at the beginning of the cochlear and when damaged permanently affects hearing for speech (particularly in distinguishing among consonants and creates confusion among some vowels). Now research has shown that low freq noise - often not as easily noticed - is equally damaging of high frequency hearing.
__________________
Merv
Ford Cobra
Harrison #80.
Peregian Beach
Sunshine Coast Qld.
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07-06-2010, 04:17 AM
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CC Member
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Join Date: Jun 2006
Location: Newcastle, Warners Bay,
NSW
Cobra Make, Engine: RMC . 393 Dart alloy block Stroked 351 alloy heads ..all the goodies plus a pre oiler. al
Posts: 1,495
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Not Ranked
Despite being deaf...what about the abuse to that engine. Those rapid on and off hard revs put amazing stresses on the crank. Twist then un-twist. Good thing it gets rebuilt often !
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07-12-2010, 06:26 AM
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CC Member
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Join Date: Aug 2008
Cobra Make, Engine:
Posts: 1,106
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Not Ranked
I think this debate over muff or no muff has taken away from the fact this video is pretty cool.......
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