Mike,
When fuel is vaporized, its temperature is reduced in the
surrounding air.
The water ports in the intake are to prevent icing and promote
vaporization of the fuel mixture.
The disadvantage here is that heating the intake causes an
increase in the intakes pressure (lack of vacuum), which causes
less air (lower density) to be packed into the combustion chamber.
For performance you want to keep the intake and carbs as cool
as possible so that the air density is highest. This will generate
more power.
There is a controdiction between what is needed for fuel economy
and cold weather requairements, vs what the engine needs to make peak
power.
For performance, blanking of the water to the intake will help,
but at the detriment of cold weather operation.
This is usually acceptable since these are usually considered
fair weather cars.
Jarrid Gross
-----Original Message-----
From: owner-alpines@autox.team.net
[mailto:owner-alpines@autox.team.net]On Behalf Of msmcmahon
Sent: Monday, August 12, 2002 11:36 AM
To: Alpine list
Subject: intake manifold
I was just browsing e-bay and came across a carb and manifold set for sell.
In
the description was a statement that confused me.
Here's the description;
"1 used Sunbeam Alpine dual Zenith carb, linkage and manifold set up. All
moving parts are free; the carbs will need cleaning and kits before use. The
water passage in the manifold has a 1" repairable crack in it. If you are
going for more performance the water ports in the manifold can be blocked
and
there will be no need for repair."
What confused me is the 'blocking the water ports for more performance'
part.
Can anybody shed some light on that for me? What are the benefits or
drawbacks
to the water ports on the manifold.
Not a big deal, just learning all I can and always in search of more
performance.
Thanks,
Mike McMahon
B9005702
|