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Rating: 3
Amal Concentric Carb Insulating Spacer? #734388
05/07/18 1:13 pm
05/07/18 1:13 pm
Joined: Apr 2015
Posts: 47
Florida
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BillD47 Offline OP
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Florida
I am putting "thin" insulating spacers between the carbs and head on my '65 Spitfire. Since these are hard spacers, should there be paper gaskets on both sides of each insulator?
Good day!

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Re: Amal Concentric Carb Insulating Spacer? [Re: BillD47] #734418
05/07/18 7:08 pm
05/07/18 7:08 pm
Joined: Mar 2005
Posts: 10,108
Boston, Massachusetts
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John Healy Offline
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Boston, Massachusetts
The factory used the "O" ring for a seal on the carburetor side and a paper gasket on the engine side.


Re: Amal Concentric Carb Insulating Spacer? [Re: BillD47] #734489
05/08/18 12:09 pm
05/08/18 12:09 pm
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Posts: 47
Florida
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BillD47 Offline OP
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Thank you.

Re: Amal Concentric Carb Insulating Spacer? [Re: BillD47] #734506
05/08/18 3:16 pm
05/08/18 3:16 pm
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Posts: 1,049
Lancaster, California
C.B.S Offline

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Curious to know... what size (thickness) spacers are you using?

Re: Amal Concentric Carb Insulating Spacer? [Re: C.B.S] #734628
05/09/18 2:41 pm
05/09/18 2:41 pm
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UK
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VicCyclone Offline
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They are not really spacers, they are heat insulation washers. The originals were made from TUFNOL a hard laminated fabric/resin material made by the TUFNOL company who are still in business in their original factory in Wellhead Lane Perry Barr Birmingham. More or less directly opposite the site of the AMAL factory in Holford Road. TUFNOL is a similar material to Paxolin which was used to make Lucas magneto gears


VicCyclone

1965 A50 Cyclone Clubman
1966 Victor GP
1967 Victor Special
1968 Victor Special
1968 A65L

2009 HD FXDC
Re: Amal Concentric Carb Insulating Spacer? [Re: C.B.S] #734654
05/09/18 6:49 pm
05/09/18 6:49 pm
Joined: May 2013
Posts: 4,828
Rotherham - S. Yorkshire
Allan Gill Offline

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Originally Posted by C.B.S
Curious to know... what size (thickness) spacers are you using?



Same here. Many on the market are too thin, from memory the originals were about 3/16 thick, Ive seen some
About 1/8 which is too thin. That said, I wouldn’t use anything less than 10mm spacers on mine, on a hot day in heavy traffic anything much thinner causes running problems from the fuel boiling in the bowls.


beerchug
Re: Amal Concentric Carb Insulating Spacer? [Re: BillD47] #734670
05/09/18 10:08 pm
05/09/18 10:08 pm
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Posts: 47
Florida
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BillD47 Offline OP
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Florida
I have purchased the thin insulators, but after your comments I may be buying a thick set as well. Thanks again for the insight.

Re: Amal Concentric Carb Insulating Spacer? [Re: BillD47] #734695
05/10/18 4:24 am
05/10/18 4:24 am
Joined: Apr 2007
Posts: 794
Brisbane, Australia
BrizzoBrit Online content

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Yes, I'd reiterate what Alan says. I had issues with the fuel vaporising in the float bowls here in Brisbane summers. I now use 3/4" thick ones. Air filters only just squeeze in with concentrics. Might not work for monoblocs.

Cheers
ray

Last edited by BrizzoBrit; 05/12/18 12:28 am. Reason: use of correct word

BSA 1969 A65F
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Re: Amal Concentric Carb Insulating Spacer? [Re: BillD47] #734724
05/10/18 12:03 pm
05/10/18 12:03 pm
Joined: May 2004
Posts: 3,696
Sydney Australia
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BSA_WM20 Offline
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Apparently the same material is used for heavy industrial fuse boxes.
So find some one who makes them and see if you can get off cuts.


Bike Beesa
Trevor
Re: Amal Concentric Carb Insulating Spacer? [Re: BillD47] #734759
05/10/18 5:35 pm
05/10/18 5:35 pm
Joined: Jun 2002
Posts: 9,809
Scotland
S
Stuart Offline
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Hi Bill,

Originally Posted by BSA_WM20
Apparently the same material is used for heavy industrial fuse boxes.find some one who makes them and see if you can get off cuts.

Originally Posted by BillD47
I have purchased the thin insulators,
may be buying a thick set as well.

Surrey Cycles certainly used to have them in several thicknesses - worth an e-mail to check? https://surreycycles.com/contact-us/

Hth.

Regards,

Re: Amal Concentric Carb Insulating Spacer? [Re: BillD47] #735135
05/13/18 3:56 pm
05/13/18 3:56 pm
Joined: Feb 2014
Posts: 1,049
Lancaster, California
C.B.S Offline

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Lancaster, California

Re: Amal Concentric Carb Insulating Spacer? [Re: BillD47] #735201
05/14/18 4:13 am
05/14/18 4:13 am
Joined: Jan 2014
Posts: 3,753
Aus
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NickL Offline
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Aus
The Triumph carb mounting idea with the bigger sectional O-ring is also a viable alternative.
Th larger ring keeps the two flanges separated so very little heat is transferred. Care must be taken
so as not to over tighten the carbs though. The o rings are available from triumph stockists and may
be used either on their own or with the standard thin insulating spacer. I employ this method on my t'bolt
for the same reasons and have very little room for extended spacers.

The material described for use within electrical switchboards is commonly known as 'Paxolin' or 'Type-X'
It commonly comes in thicknesses from 3- 25mm or so.



Re: Amal Concentric Carb Insulating Spacer? [Re: BillD47] #735405
05/15/18 3:30 pm
05/15/18 3:30 pm
Joined: Feb 2014
Posts: 1,049
Lancaster, California
C.B.S Offline

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Lancaster, California
I had some issues with my A65L carbs getting hot. I went with the thickest phenolic spacer then I used the thinnest 5/16" X 24 nuts to grab onto the studs. Fixed my problems..

Re: Amal Concentric Carb Insulating Spacer? [Re: BillD47] #735509
05/16/18 7:19 am
05/16/18 7:19 am
Joined: May 2013
Posts: 4,828
Rotherham - S. Yorkshire
Allan Gill Offline

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Could use longer studs


beerchug

Moderated by  Allan Gill, Jon W. Whitley 


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