| heat shield Generator manifold [message #147063] |
Wed, 19 October 2011 13:43  |
1275gtsport
Messages: 272
Registered: September 2009
Location: Rothesay NB
Karma: 0
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After searching the forum I can not find any info on why there is no cover over the manifold of the onan. I did see photo's on the site of someone that had built one. the compartment the onan is in is fiberglass and the foil like heat blanket is less then complete. (will replace soon) but thought it might be a good idea to add a metal shield for that little extra insurance. the biggest issue I can think of would be of restricted air flow. any other thoughts?
Adam Raeburn
Rothesay, NB
1976 Austin Mini
1977 GMC Palm Beach
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Once you replace everything that is attached to something else. It will all be fixed.
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| Re: heat shield Generator manifold [message #147165 is a reply to message #147063] |
Thu, 20 October 2011 03:40  |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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That is one of the projects I was going to get around to. I haven't decided to whether to attach the heat shield to the generator or to the cabinet the generator is mounted in. My Onan cabinet is foam lined and the foam on the top is slightly burned above the exhaust manifold. I am going to make a heat shield for the top and forward side since those are the sides close to the exhaust manifold.
Just tonight I was looking at a piece of flat galvanize at Menards that was 16" by about 24". It is normally used for constructing heat ducts. It was only $5.50. I'm going to measure the cabinet again and see if with a little bending and trimming it will work.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: heat shield Generator manifold [message #147250 is a reply to message #147063] |
Fri, 21 October 2011 01:53 |
Adrien G.
Messages: 474
Registered: May 2008
Location: Burns Flat, OK 73624
Karma: 1
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Senior Member |
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Adam,
I know that the early models had wood covers over the gen and lp, I have aluminum ( they look oem); has your cover been changed, to be fiberglass?
I noticed that since I replaced the pads (thick, 3/4" vs crushed 3/8") and reducing the space between frame and pan (now there's space for a heat shield (or maybe 2), and some sort of ? insulation along with inside sound material.
McMaster-carr has listed a high temp thermo board that maybe good to put over the manifold area.
I wonder how much additional heat is induced in the gen with the shield redirecting the radiant heat?
Adrien & Jenny Genesoto
75 Glenbrook (26-3) Mods LS3.70 FD / Reaction Sys / 80mm Front&Intermidiate / Hydroboost / 16" Tires / Frame Rebuild / Interior Rebuild
Yuba City,Ca. Text 530-nine-3-three-3-nine-nine-6
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| Re: [GMCnet] heat shield Generator manifold [message #147251 is a reply to message #147250] |
Fri, 21 October 2011 02:07 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Adrien,
Please provide info on the McMaster board.
Regards,
Rob M.
-----Original Message-----
From: Adrien Genesoto
Adam,
I know that the early models had wood covers over the gen and lp, I have aluminum ( they look oem); has your cover been changed, to
be fiberglass?
I noticed that since I replaced the pads (thick, 3/4" vs crushed 3/8") and reducing the space between frame and pan (now there's
space for a heat shield (or maybe 2), and some sort of ? insulation along with inside sound material.
McMaster-carr has listed a high temp thermo board that maybe good to put over the manifold area.
I wonder how much additional heat is induced in the gen with the shield redirecting the radiant heat?
Adrien
75 Glenbrook
Yuba City,Ca.
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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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| Re: [GMCnet] heat shield Generator manifold [message #147252 is a reply to message #147251] |
Fri, 21 October 2011 02:51 |
Adrien G.
Messages: 474
Registered: May 2008
Location: Burns Flat, OK 73624
Karma: 1
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Senior Member |
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Rob,
This is what I'm thinking of. It's not cheap, but what is?
Ultra-High Temperature Sheets
• Temp. Range: Max. 1700° F; low end not rated
• Heat Flow Rate (K-factor): 0.80 Btu/hr. x in./sq. ft. @ 800° F
• Density: 40 lbs./cu. ft.
• Color: White
Cut with a handsaw or power saw. Install using metal banding (not included; see page 3491), drywall screws, nails, or high-temperature adhesive. Meet ASTM E84 0/0 for flame and smoke.
24" x 48" 48" x 48" 48" x 96"
Thick. Each Each Each
1/2" 9353K41 $90.56 9353K61 $159.05 9353K51 $283.54
Ultra-High Temperature, High-Strength Sheets
• Temp. Range: Max. 1700° F; low end not rated
• Heat Flow Rate (K-factor): 1.05 Btu/hr. x in./sq. ft. @ 800° F
• Density: 55 lbs./cu. ft.
• Color: White
These sheets have exceptional strength due to their chemical structure. Cut with a handsaw or power saw.
24" x 48" 48" x 48" 48" x 96"
Thick. Each Each Each
1/2" 93505K22 $198.64 93505K32 $315.64 93505K42 $572.30
The ultimate is to cover this board with alum or stainless sheet to protect it, over time they tend to crack but don't loose their K-factor.
I would use machine screws to hold in place.
Glad to be of help.
Adrien & Jenny Genesoto
75 Glenbrook (26-3) Mods LS3.70 FD / Reaction Sys / 80mm Front&Intermidiate / Hydroboost / 16" Tires / Frame Rebuild / Interior Rebuild
Yuba City,Ca. Text 530-nine-3-three-3-nine-nine-6
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| Re: [GMCnet] heat shield Generator manifold [message #147263 is a reply to message #147252] |
Fri, 21 October 2011 08:28 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Adrien,
Thanks for all the details; I'll measure the top of the Onan compartment. I think one 24" x 48" sheet would do two GMC's..
Regards,
Rob M.
-----Original Message-----
From: Adrien Genesoto
Rob,
This is what I'm thinking of. It's not cheap, but what is?
Ultra-High Temperature Sheets
• Temp. Range: Max. 1700° F; low end not rated
• Heat Flow Rate (K-factor): 0.80 Btu/hr. x in./sq. ft. @ 800° F
• Density: 40 lbs./cu. ft.
• Color: White
Cut with a handsaw or power saw. Install using metal banding (not included; see page 3491), drywall screws, nails, or
high-temperature adhesive. Meet ASTM E84 0/0 for flame and smoke.
24" x 48" 48" x 48" 48" x 96"
Thick. Each Each Each
1/2" 9353K41 $90.56 9353K61 $159.05 9353K51 $283.54
Ultra-High Temperature, High-Strength Sheets
• Temp. Range: Max. 1700° F; low end not rated
• Heat Flow Rate (K-factor): 1.05 Btu/hr. x in./sq. ft. @ 800° F
• Density: 55 lbs./cu. ft.
• Color: White
These sheets have exceptional strength due to their chemical structure. Cut with a handsaw or power saw.
24" x 48" 48" x 48" 48" x 96"
Thick. Each Each Each
1/2" 93505K22 $198.64 93505K32 $315.64 93505K42 $572.30
The ultimate is to cover this board with alum or stainless sheet to protect it, over time they tend to crack but don't loose their
K-factor.
I would use machine screws to hold in place.
Glad to be of help.
--
Adrien
75 Glenbrook
Yuba City,Ca.
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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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| Re: [GMCnet] heat shield Generator manifold [message #147277 is a reply to message #147263] |
Fri, 21 October 2011 09:43 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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Senior Member |
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| Robert Mueller wrote on Fri, 21 October 2011 08:28 |
Adrien,
Thanks for all the details; I'll measure the top of the Onan compartment. I think one 24" x 48" sheet would do two GMC's..
Regards,
Rob M.
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My PO put sheet metal on the underside of the top of the wooden gen compartment. I suspect he did that after a burn spot turned up on the top of that panel inside the coach. I plan to pull this sheet metal out and sandwich a layer of fiberfrax (from Aircraft Spruce) between the sheet metal and the wood. The put another layer of fiberfrax on top of the exhaust manifold in the area where the manifold is carrying the exhaust from both cylinders. The burn spot is only above the manifold where it carries the exhaust from both cylinders.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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