Manifold Heater for Cold Climates

i'm sure its fine

race focused manifolds don't have a hot box because they are used mainly for wide throttle open operation in race situations
who cares if there is a problem just off idle on a humid day when stuck in traffic

its not necessarily ambient temperature that causes a problem
Dry and cold no problem car will run fine i'm sure
hot day car will be fine

pump shot tuned to work with the set up you have... which includes a manifold that could reach internal temperatures below freezing, if economy is a concern that pump shot could be smaller

Hot box is included on OEM set-up to cover off a combination of humidity and dew point that causes puddling and then ice to form inside the manifold that can happen in real cold weather or quite clement weather... but it doesn't happen everywhere because its due to the water content of the air and the depression caused under the carb after the movement of air through its venturi. i.e the existence of the heat cross over has less to do with it being cold or hot weather and more to do with Humidity or dampness and pressure (or vacuum)

wet air goes through a carb and the pressure of it is rasied and lowered as it passes through the venturi
in the manifold it predominately sees vacuum when the throttle is not wide open
raising pressure causes the water in the air to stay in
lowering pressure will allow it to fall out
real low pressure causes a refrigeration effect
for air to expand into this vacuum it sucks in heat
that can...not will...can, cause ice in the manifold regardless of how hot a day it is

but you can help avoid it with a manifold who's ambient temperature is moderated by something that will never get to freezing

keep in mind that the vast majority of Australians live in hot places or places that can get quite hot. you can go skiing in Oz if you want but most live on the coast and it gets quite hot.
but you can also have some fantastic extremes in the dampness/humidity and not necessarily on hot days


Aussiespeed have decided to make a hot box attachment for a big long manifold. you would expect them to be the last people to be wanting to heat up their inlet, if this was about ambient temperature of the air.

with these installed you still have a nice cold charge going into the motor because the heated inlet cools damn quick when you start to do something like move.

as usual this is how i understand it, i am just some geezer sitting at a desk, who should be fixing a website but is messing on here instead :) .... i may be wrong

Dave