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#1
10-08-2002, 07:58 AM
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I have 2 1966 Bonnevilles. Both are YE 389 4barrel auto cars. Both have dual exhaust with 40 series Flowmasters. My 4dr has 2" pipes, my 2dr has 2 1/4" pipes. Besides the fact that my 4dr has a 1/4" smaller pipe why is it so much quieter than my 2dr? My 2dr is LOUD, my 4dr is REAL quiet.
They both have #92 heads, same ignition coil, Accell 8mm wires. What is the deal?? I really don't want to have to replace the pipes on my car. Give me a thumbs up, tell me "Nice Car!", but for god's sake, don't call it an Impala. |
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#2
10-08-2002, 07:58 AM
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I have 2 1966 Bonnevilles. Both are YE 389 4barrel auto cars. Both have dual exhaust with 40 series Flowmasters. My 4dr has 2" pipes, my 2dr has 2 1/4" pipes. Besides the fact that my 4dr has a 1/4" smaller pipe why is it so much quieter than my 2dr? My 2dr is LOUD, my 4dr is REAL quiet.
They both have #92 heads, same ignition coil, Accell 8mm wires. What is the deal?? I really don't want to have to replace the pipes on my car. Give me a thumbs up, tell me "Nice Car!", but for god's sake, don't call it an Impala. |
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#3
10-08-2002, 08:18 AM
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Muffler bearings could be wearing out.
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#4
10-08-2002, 08:20 AM
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yeah,take a left hand wrench,adjust the muffler bearings. you may need a skyjack to help with lift.
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#5
10-08-2002, 08:31 AM
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[img]/infopop/emoticons/icon_rolleyes.gif[/img]
Ok, a real answer this time.......... Give me a thumbs up, tell me "Nice Car!", but for god's sake, don't call it an Impala. |
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#6
10-08-2002, 08:33 AM
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Its because I left the little U things off of my Eagle Rods right?
I think the framus rod is bad, something about the duration of my camber shaft being to short? Give me a thumbs up, tell me "Nice Car!", but for god's sake, don't call it an Impala. |
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#7
10-08-2002, 10:01 AM
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different cams
"11.00/123MPH/1.50 60foot/29.5"/4.10:1/10"/472 #48/Flat HYD/DualQuad/Wenzler/3250Lbs 12.00/112MPH/1.61 60foot/26"/3.31:1/10"/472 #48/FlatHYD/Q-Jet/Torker/3650Lbs"
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12.24/111.6MPH/1.76 60'/28"/3.54:1/SP-TH400/469 R96A/236-244-112LC/1050&TorkerI//3850Lbs//15MPG/89oct Sold 2003: 12.00/112MPH/1.61 60'/26"x3.31:1/10"/469 #48/245-255-110LSA/Q-Jet-Torker/3650Lbs//18MPG 94oct Sold 1994: 11.00/123MPH/1.50 60'/29.5"x4.10:1/10"/469 #48/245-255-110LSA/Dual600s-Wenzler/3250Lbs//94oct |
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#8
10-08-2002, 10:03 AM
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Also any little manifold leak will resonate as a very loud sound out the exhaust. At least thats been my experience.
 GR-RRR!
__________________
 1970 GTO 458 CID .040 over 4 Bolt 428 Block, Forged Eagle 455 Crank, 295 CFM SD KRE D-Ports, SD Old Faithful HR Cam + Comp HR Lifters, PPR Maxx-lite rods, Racetec pistons, PRW 1.65 SS Rockers, 900CFM Holley HP TBI, Performer RPM, Hooker Super Comps, 3" X-Pipe into 2.5" mufflers/tailpipes, 2.75 1st TH400, Continental 13" Converter, 8.5" 3.08 Posi. Everything installed, fired up and tuning has begun! |
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#9
10-08-2002, 06:32 PM
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I was thinking about the cam, I wouldn't think that they would have different cams in them.
Give me a thumbs up, tell me "Nice Car!", but for god's sake, don't call it an Impala. |
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#10
10-08-2002, 06:36 PM
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According to my book, they both have the same cam in them. I am so confused.....
Give me a thumbs up, tell me "Nice Car!", but for god's sake, don't call it an Impala. |
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#11
10-08-2002, 06:38 PM
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Larger pipes will make more noise. How much of a difference is there?
http://kurtspontiac.homestead.com/DavidJones69GTO.html
__________________
 frittering and wasting the hours in an off hand way.... 1969 GTO, 455ci, 230/236 Pontiac Dude's "Butcher Special" Comp hyd roller cam with Crower HIPPO solid roller lifters, Q-jet, Edelbrock P4B-QJ, Doug's headers, ported 6X-8 (97cc) heads, TKO600, 3.73 geared Eaton Tru-Trac 8.5", hydroboost, rear disc brakes......and my greatest mechanical feat....a new heater core. 
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#12
10-08-2002, 06:46 PM
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Joe, are you talking outside of the car is louder or inside is louder?
 http://www.kurtspontiac.homestead.com/Dannys65GTO.html
__________________
 SIGPIC]http://forums.performanceyears.com/forums/image.php?type=sigpic&userid=139862&dateline=12616 03096[/SIGPIC]http://www.youtube.com/watch?v=iJrDl3nRNCM http://www.youtube.com/watch?v=Fvywdocl4GA http://ultimategto.com/icongraf/65headtitle.jpg |
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#13
10-08-2002, 08:10 PM
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Going from 2" to 2-1/4" is a significant difference.
Don't change to smaller exhaust pipes, put quieter mufflers on. Those Flowmasters are LOUD. Try Walker/Dynomax Super Turbos instead. 
__________________
---------------------------- '72 Formula 400 Lucerne Blue, Blue Deluxe interior - My first car! '73 Firebird 350/4-speed Black on Black, mix & match. |
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#14
10-14-2002, 08:46 AM
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Yeah the smaller pipes have 79% cross sectional area of the larger pipes, which as they said makes a big diff. Also, if the pipes have any additional bends that can have a big effect. I changed the tailpipes on my truck from el cheapos to full mandrel bends and it was as if there were no pipes at all, a huge increase in noise.
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