Ok, Last Question Webber Gaskets 2 Type to Choose

[Captain Manly]

Ok, strange question I know but I am not a master engine mechanic.

 

Got my carbs rebuilt and planning to install them, I have 2 sets of gaskets to attach them to the intakes, one set is a typical paper thin and one set are 1/4" thick.  Is there a preference; am I suppose to use the thicker ones for improved air flow (still have enough room for the  brake boost)? 

 

I know SQOTD, but its Monday and not enough coffee.

 

Thanks!!

Justin 

[hynrgee]

I am not an experienced wrencher. Just describing what I did. In this case I read a lot and then experimented. Lots of opinions to wade through so when I did my installation I went from this:

 

 

to this:

 

 

The car is running much better than before in combination with the 123Tune group buy that you organized (and I took advantage of, thank you!). I went with the 12mm spacer because of the greater consensus regarding the benefits. There is a gasket above and below the 12mm spacer. The carburetor does not interfere with the hood at that height on my car. I used a small amount of copper gasket sealant which was not mentioned in the Weber directions. I did not apply the sealant to the gasket between the carburetor and air filter.

 

Looking forward to seeing other responses.

 

Good luck!

Edited March 20, 2017 by hynrgee
Missing information.

[Mike Self]

The thick "gasket" is actually a heat shield (or heat sink) that keeps the heat from the manifold from moving up to the carburetor and possibly causing fuel to boil in the float chamber.  It's made from phenolic board, a much better insulator than paper!  The paper gaskets go on each side of the heat shield to seal things up nice and tight so there are no vacuum leaks.  

 

Don't overtighten the carb holddown nuts; you'll warp the carb's base.  In fact, if it's a used carb, before installing, place a straightedge over the carb's base and see if it's warped from a PO's overzealous tightening.  You may have to do a little judicious sanding (emery cloth stretched over a piece of glass) to get it flat again.  

 

cheers

mike

[KFunk]

He referred to 'carbs' in the plural sense, and mentioned brake booster interference, 2 sets of gaskets, etc., so I presumed he meant sidedrafts.

 

With sidedrafts, you might be thinking of simple paper gaskets vs. soft mounts that are thicker with more flexy rubber.   Some folks say that if the sidedraft carbs are mounted too solidly to the engine, theyll shake around too much and foam (?) up the fuel too much or something.  I used soft mounts for a while, and was always suspicious that they could give more leeway for vacuum leaks.  I've been running the thin paper gaskets for 5 or 6 years now though, and never had any problems that I could attribute to them.  

Edited March 20, 2017 by KFunk

[Simeon]

I am going to (if I ever get around to it) use phenolic spacers that are maybe 10mm thick with paper gaskets either side of each. This is with Solex PHHs but Webers would be same principle.

 

Watch your linkage can accomodate where your carbs end up if you do use them.