CV carb insulator block

[billbuilds]

     Do you feel that it's necessary to use an insulator block between the CV carb body and the intake manifold? Ran an SU eliminator for a while w/o one and it worked fine. Not the same animal, I know. Your thoughts please. Bill

[JW113]

I use one, but mainly to get some clearance between the air cleaner backplate and the tank. I have a nice scar in the paint on the tank from not using one.

-JW

[billbuilds]

       Thanks JW.  I should have mentioned that it's going on a 73 FX with the stock turtle tank so clearing it should not be an issue. I guess I was thinking more in the realm of any benefit from the thermal insulation that your carb gets using the block versus not using it and just the gasket. .  Bill

[JW113]

How are you mounting it? Rubber flange adapter or press on/JB Weld adapter from Killer? Also, is your intake manifold the compliance bands, or O-ring type?

-JW

[billbuilds]

How are you mounting it? Rubber flange adapter or press on/JB Weld adapter from Killer? Also, is your intake manifold the compliance bands, or O-ring type?

-JW

     I've got one of the JB weld-on adapters. The motor is a 1980 80" so it's got the rubber band style intake seals. SE backing plate has a couple of holes already drilled; will be making brackets to attach to rocker boxes undersides. 

[JW113]

OK, cool. (no pun intended!) I think the main point of the insulator block is to keep the carb from boiling the gas in the bowl when you shut the motor down. If the carb/intake manifold is not in direct contact with the heads, then you don't get the heat transfer to the carb. Stock Evos have the carb isolated with that rubber O-ring spiggot mount. If you're using the compliance fittings on the intake manifold, probably be OK to not head soak the carb.

-JW

[76shuvlinoff]

Using the J&B CV adapter here too. I  do not have a block to speak of like the 3/8 I had with the S&S E, but I do have a thin homemade gasket in there so I guess there's some insulation going on.

[Burnout]

I think the insulation block is more for when you park the bike, than running.....

That would slow down heat transfer on a hot soak.

[dirtymike]

Isolation or insulation, Which one. 

[Burnout]

I think we are talking about the 3/8" insulator that is often found with an S&S carb

[JW113]

Yep, for parked after riding so it is easier to start again (prevent flooding).

-JW

[76shuvlinoff]

 Kinda OT but insulating the fuel line, and/or being very specific with routing, matters on my 76.