H4 twin SU rebuild

[970s]

Hi, Just started to rebuild my twin H4 SU set, wonder if anyone remember should I soaked the floatbowl gasket in fluid before fitting? in gasoline or oil or what fluid ?.... should I change the medium bronze loat to a smaller diameter one? Like Swiftune kits used to do!
Thanks for advise!

Al

[mk1]

The gasket can be fitted dry, and although fitting the smaller float was a popular racing tweek a while ago, the standard float works better for road use.

M

[970s]

Thanks Mark!
How's you Speedwell project goung?


Al

[mk1]

You are welcome!

How's you Speedwell project going?

Not at all, I haven't touched it in about 3 years. I am however starting to think about doing it again. So, watch this space.

M

[johnsimister]

Re the floats, what are the pros and cons of the standard-size float versus the smaller one? Why is one better for racing and the other for road? I ask because my supercharged 850's H4 has the smaller float in a chamber able to take the bigger one, and I was wondering why this should be.

John

[rich@minispares.com]

john

it just means that there is an extra reserve of fuel in the float chamber 'on demand' if your really thrashing it

[johnsimister]

Thanks, that makes sense. Could be useful given the little beast's sometimes voracious thirst. I'll leave it as is.

John