G'day folks,
Originally Posted by Tyler
This is just thinking out loud Norm, but you know how some of the decomp nozzles have the little brass restrictor and others don't? I think it was to prevent a backfire causing the valve to smash into the 'ramp' in the cylinder and break the stem.

In theory there would be a slight difference in how the vacuum is delivered to the diaphragm - slower or faster

Don't know if the difference would be appreciable though
It would be appreciable, I'd say, given the very small area of the restrictor hole vs an unrestricted deco nozzle. Slower, for sure.

It's all about gas flowrates here, just at less than atmospheric pressure!

BTW, I'll move these posts on deco 'fine tuning' to a new topic shortly - just so that the info is readily 'findable'.

Cheers,
Gadge

"ODK Mods can explain it to you, but they can't understand it for you..."

"Crazy can be medicated, ignorance can be educated - but there is no cure for stupid..."