Phantom vacuum tube on manifold

R

Randy Bograd

Guest
There is a vacuum tube coming off the intake manifold. I see no logical
connection for it. The vacuum advance for the distributor goes to the
carburetor. Is this an auxiliary vacuum source?

Randy
'67 in Gaithersburg, MD
 
D

David Chapman

Guest
Do you mean the fuel drain pipe? That's important to treat right, looks like
brake pipe and comes down in a large J shape. I've pasted below what the worlds
leading Triumph Herald expert (that is no exageration) said when asked by a
Herald owner what it does. On the Herald it's straight but on Amphicar it's J
shape is so the fuel evaporates.

David Chapman

The hole is at the low point of the inlet manifold, and until the exhaust
heats up the inlet manifold fuel condenses on the inside and is designed to
run out onto the road via the pipe. Blanking the hole off will mean the mixture
will be
made richer as effectively the hole weakens it off so it may mean you use
more fuel rather than less! Herald 1200s can be quite economical provided
both the vacuum and centrifugal advance in the distributor are working and
the timing is set correctly. When the hole in the pulley is lined up with
the pointer on the timing cover it is top dead centre and not the timing
mark, the points should open 15 degrees before the marks align, which is
something like 1 cm. Also check the engine has short reach plugs and the
polarity is correct.

John Kipping



[Non-text portions of this message have been removed]
 
R

Randy Bograd

Guest
Yes, that's the pipe. I actually taped it off, thinking I was losing
vacuum. Guess I'll let it breathe.

thanks much.

Randy


On Sat, 22 Mar 2003 16:30:29 -0000 "David Chapman" <david@manbus.com>
writes:
> Do you mean the fuel drain pipe? That's important to treat right,
> looks like brake pipe and comes down in a large J shape. I've pasted
> below what the worlds leading Triumph Herald expert (that is no
> exageration) said when asked by a Herald owner what it does. On the
> Herald it's straight but on Amphicar it's J shape is so the fuel
> evaporates.
>
> David Chapman
>
> The hole is at the low point of the inlet manifold, and until the
> exhaust
> heats up the inlet manifold fuel condenses on the inside and is
> designed to
> run out onto the road via the pipe. Blanking the hole off will mean
> the mixture will be
> made richer as effectively the hole weakens it off so it may mean
> you use
> more fuel rather than less! Herald 1200s can be quite economical
> provided
> both the vacuum and centrifugal advance in the distributor are
> working and
> the timing is set correctly. When the hole in the pulley is lined up
> with
> the pointer on the timing cover it is top dead centre and not the
> timing
> mark, the points should open 15 degrees before the marks align,
> which is
> something like 1 cm. Also check the engine has short reach plugs and
> the
> polarity is correct.
>
> John Kipping
>
>
>
> [Non-text portions of this message have been removed]
>
>
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