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carb isolation block material

Posted by maddy

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carb isolation block material #1
maddy Mark Addy Coeur d'Alene, Idaho, USA 1979 MG Midget 1979 MG Midget "Mget" 2001 Dodge 1500 2004 Toyota Solara	Posted: September 07, 2012 11:34PM Registered: 4 years ago Posts: 1,809

What would be a good carb isolation block material that can withstand and not transfer heat? 1/2" thick would be great. Finding it locally at an auto parts or hardware store would be best. We do have an appliance parts store here. I just don't know what to look for.
Thanks,
Mark

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Re: carb isolation block material #2
VII stephen w Albuquerque, NM, USA 1974 MG Midget 1981 Honda MC CB650C 1983 Honda VF750F Intercepter 1999 Volkswagen Beetle	Posted: September 08, 2012 01:56AM Registered: 3 years ago Posts: 1,094

On my Weber I used some sort of thick rubber (cm maybe) that came in a sheet roughly 4"x6". It was used between the carb and manifold. Worked well to drop my carb temp but it raised the carb too much and hit the hood.

If you're using the stock SU carbs then you'll need something a bit thicker. Perhaps you can find some make your own gasket stuff that's thick enough?

-
VII
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Re: carb isolation block material #3
Kerr Norm Kerr Ann Arbor, Mi, USA 1974 MG Midget	Posted: September 08, 2012 07:09AM Registered: 4 years ago Posts: 2,513

Mini Spares sells a range of phenolic spacers pre-made for SU carburetors, including handy vacuum ports for balancing twin carbs with (very handy).

Grainger sells blocks of phenolic resin that you can machine into whatever shape you need (that's how I made the thermal insulator spacers for my Ural motorcycle when the Mikuni carb rubber spacers wore out). You can band saw cut the outer shape, and then drill the holes you need. The dust is really messy though, kind of like pencil dust.

Also, if you google on "carbon spacer" you'll find a lot of carbon fiber spacers meant to be used for insulating a variety of carburetors using hose clamps for attachment.

Norm

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Re: carb isolation block material #4
kirks-auto robert kirk Davenport, Iowa, Rock Island, Illinois, Clearwater, USA	Posted: September 08, 2012 10:26AM Registered: 4 years ago Posts: 13,159

Norm x2 but finding phenolic material and time to machine it in DIY fashion is pretty much outweighed by just buying the correct spacers IMHO. About $25 depending on your set up.

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Re: carb isolation block material #5
maddy Mark Addy Coeur d'Alene, Idaho, USA 1979 MG Midget 1979 MG Midget "Mget" 2001 Dodge 1500 2004 Toyota Solara	Posted: September 08, 2012 02:15PM Registered: 4 years ago Posts: 1,809

The correct spacer may be a problem as I am installing Minkuni carb. I want the iso block before the adapter. I'll chack if a harley store sell the block.

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Re: carb isolation block material #6
mjamgb michael anderson NORTHERN NEVADA, USA 1954 MG Magnette ZA 1967 MG MGB 1973 MG MGB 1974 MG Midget	Posted: September 10, 2012 10:56AM Registered: 4 years ago Posts: 6,403

Pretty sure the bolt pattern is the same as the Solex/Weber/etc. and I KNOW they make isolator blocks and spacers for them. Try googling DCOE spacer.

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Re: carb isolation block material #7
maddy Mark Addy Coeur d'Alene, Idaho, USA 1979 MG Midget 1979 MG Midget "Mget" 2001 Dodge 1500 2004 Toyota Solara	Posted: September 10, 2012 11:21PM Registered: 4 years ago Posts: 1,809

Thanks, guys. AutoZone let me go thru their boxes in the back room... I found one! Happy camper.

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