Home » Public Forums » GMCnet » Hush power install report (rear muffler for Royales)
| Hush power install report [message #85956] |
Mon, 24 May 2010 21:42  |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
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So I got the Hush power muffler today, and got it installed.
Fit,
It's tight fit I had to bend the frame rail down a little to make a little clearance. The Flowmaster 70 actually fit height wise better. Too bad it was so wide.
Sound
It's a little loud at idle, if it was a street rod I'd like it. nice rumble. But it's a motorhome.
When you blip the throttle, it really raps, sounds like a ricer with a fart pipe. If it were a street rod I would not be happy, but it's a motorhome...I'm not happy. I'm going to try and find a resonator for the dog leg, maybe that will take out some of the rap.
I didn't get to drive it, it got late and I have a loose transmission cooler line. Maybe tomorrow, but they are promising rain...
Oh, Pictures here
http://www.gmcmhphotos.com/photos/showphoto.php?photo=34135&title=hush-power-muffler&cat=5477
Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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| Re: [GMCnet] Hush power install report [message #85959 is a reply to message #85956] |
Mon, 24 May 2010 21:51  |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma: -3
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Interesting ! After I get back from the Memorial Day trip I'm going to tackle mine.....still working on my strategy.
Ray
Ray & Lisa Erspamer
78 Royale Center Kitchen
TZE368V101144
Wauwatosa, Wisconsin 53226
Email: 78GMC-Royale@att.net
414-745-3188
Web Site: http://ray-lisa.page.tl/
________________________________
From: Keith V <my427v8@hotmail.com>
To: gmclist@temp.gmcnet.org
Sent: Mon, May 24, 2010 9:42:33 PM
Subject: [GMCnet] Hush power install report
So I got the Hush power muffler today, and got it installed.
Fit,
It's tight fit I had to bend the frame rail down a little to make a little clearance. The Flowmaster 70 actually fit height wise better. Too bad it was so wide.
Sound
It's a little loud at idle, if it was a street rod I'd like it. nice rumble. But it's a motorhome.
When you blip the throttle, it really raps, sounds like a ricer with a fart pipe. If it were a street rod I would not be happy, but it's a motorhome...I'm not happy. I'm going to try and find a resonator for the dog leg, maybe that will take out some of the rap.
I didn't get to drive it, it got late and I have a loose transmission cooler line. Maybe tomorrow, but they are promising rain...
Oh, Pictures here
http://www.gmcmhphotos.com/photos/showphoto.php?photo=34135&title=hush-power-muffler&cat=5477
--
Keith
69 Vette
29 Dodge
75 Royale GMC
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_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
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Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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| Re: [GMCnet] Hush power install report [message #85962 is a reply to message #85959] |
Mon, 24 May 2010 22:06 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
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I'll try and get a sound clip soon, maybe a couple of days.
Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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| Re: [GMCnet] Hush power install report [message #85998 is a reply to message #85996] |
Tue, 25 May 2010 09:12 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
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Larry;
I remember you saying that about your muffler experiance. My problem is the Royale has a grey tank in back 11" from the frame rail. Not enough room for the FM 70, hence the attempt to use the Hushpower.
Question. Did the 70 have as bad of a rap??
| Larry wrote on Tue, 25 May 2010 08:47 |
Keith,
I tried several mufflers back there always getting the same awful "rap". Final solution was a 70 series Flowmaster with a resonator....sorry about that. I've found that you just gotta have a BIG muffler back there. Here's a pic of the resonator in place in the dog-leg.
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Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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| Re: [GMCnet] Hush power install report [message #86007 is a reply to message #85998] |
Tue, 25 May 2010 10:54 |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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| Keith V wrote on Tue, 25 May 2010 09:12 |
Larry;
I remember you saying that about your muffler experiance. My problem is the Royale has a grey tank in back 11" from the frame rail. Not enough room for the FM 70, hence the attempt to use the Hushpower.
Question. Did the 70 have as bad of a rap??
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Keith,
No. The 70 had the least rap of all of the mufflers I tried. Non-the-less, while I couldn't hear it in the cockpit on the open road, when I got into town, I could hear it echoing off of the curb and buildings. Also could hear it in tunnels and in overpasses. Wasn't real bad, but irritating...not the kind of sound a good hot rodder would like, and it has to be unpleasant for the people walking the sidewalks. The resonator seems to have taken care of that. My pea brain tells me that you have to have a LARGE muffler back there. We are muffling 8 cylinders at once instead of the 4 with a duals system. Just what I think...
Larry 
78 Royale w/500 Caddy
Menomonie, WI.
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| Re: [GMCnet] Hush power install report [message #86036 is a reply to message #85997] |
Tue, 25 May 2010 14:40 |
Steven Ferguson
Messages: 3447
Registered: May 2006
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Ditto on mine Larry.
On Tue, May 25, 2010 at 6:55 AM, Larry <weidnerl@wwt.net> wrote:
>
>
> Larry wrote on Tue, 25 May 2010 08:47
>> Keith V wrote on Tue, 25 May 2010 08:03
>> > I had an idea last night ( at like 3am :( )
>> > I think I am going to remove the hush power and use the flowmaster 70.
>> >
>> > But I'm going to cut down the 70. If I take 2 inches off of it's width it will fit really nice.
>> >
>> > I do wonder what it will sound like. I suppose I should do a before and after comparo eh?
>> >
>> > Worse comes to worse I can use the hush power as a resonator....
>>
>>
>> Keith,
>> I tried several mufflers back there always getting the same awful "rap". Final solution was a 70 series Flowmaster with a resonator....sorry about that. I've found that you just gotta have a BIG muffler back there. Here's a pic of the resonator in place in the dog-leg.
>>
>> http://www.gmcmhphotos.com/photos/showphoto.php?photo=34140&title=img-2886&cat=3604
>
> Oh, BTW, here is the resonator I used:
> Resonator is a Vibrant 1142 3" Ultra Quiet Resonator. It is available from Amazon.com.
> http://www.amazon.com/Vibrant-1142-Ultra-Quiet-resonator/dp/B001806YE2
> --
> Larry :)
> 78 Royale w/500 Caddy
> Menomonie, WI.
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--
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
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| Re: [GMCnet] Hush power install report [message #86040 is a reply to message #86036] |
Tue, 25 May 2010 14:58 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
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I think my olds is closer to 7.5:1 ( so says the engine builder), that could explain the more rap in the Cad.
I have a 10.5:1 Vette, that really has a rap, even at idle and thats only 2 points above your 8.5:1
Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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| Re: [GMCnet] Hush power install report [message #86065 is a reply to message #86040] |
Tue, 25 May 2010 18:36 |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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| Keith V wrote on Tue, 25 May 2010 14:58 |
I think my olds is closer to 7.5:1 ( so says the engine builder), that could explain the more rap in the Cad.
I have a 10.5:1 Vette, that really has a rap, even at idle and thats only 2 points above your 8.5:1
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Mmmm, I don't think so. The very same 500 powered a 73 eldo back in the 70's and was whisper quiet. JMHO, but I think it has a lot to do with not being muffled before it hits that long 12' of streight 3" pipe down the side of the coach, then into a single muffler. Friends that have the Cad 500 with dual mufflers up front, may be a little loud, but don't have that same irritating rap. Each muffler is muffling 4 cylinders at a time. I'd bet that those that have two 70's up front have little trouble noise. Twice the muffling surface.
Larry
78 Royale w/500 Caddy
Menomonie, WI.
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| Re: [GMCnet] Hush power install report [message #86252 is a reply to message #86229] |
Wed, 26 May 2010 23:45 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Keith,
Sounds (and looks) good!
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: Keith V
Here is the promised sound clip.
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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