Two things:

Ya, a tube roller would do it, but a prosser (like an exhaust pipe
expander) would also. The best way is the proper socket expander.

The icing issue is best handled with air preheat. Preheat duct to the
carb intake to draw air over the cooling fins on the cylinder.


wrote:
Hey all - I've been doing some research on this problem for almost a
year now. I've kind of got a good idea of what I need but let me
describe the problem.

I've successfully converted a 3 horsepower Briggs and Stratton
vertical
engine to horizontal use. I did 26.08 hours of test running and it
just kept right on going. The tests were held outdoors in the dead
cold of winter so since part of my conversion involved extending the
intake tube by using a rubber tube, I soon had carb ice issues
because
no longer would the warmth of the engine make it to the carb
(isolated
by the rubber tube.)

What I need to do is take a piece of tubing which has a 3/4" O.D. and
expand it to 3/4" I.D. to a depth of one inch. Then all I have to do
is hammer the tube over the existing one and presto - I'll have an
extended intake tube. My goal is produce a very simple kit which
lets
you take a vertical shaft mower, convert it to horizontal, so that it
can be used in horizontal applications. I'm currently checking ebay
for a minibike frame so I can mount the engine (via a bracket) to it
and test it out further.

Is a boiler or condensor tube roller what I need here? What I need
essentially is a miniature version of a tail-pipe expander.

Thanks for the help and please - if you can assist me here, please
contact me at

Pictures of the conversion are found at
http://www.nqvw.com/verthoriz/

Just ignore all the other pictures - the ones you wanna see are
engine1.jpg - engine9.jpg

Thanks!

Erin