Porting a leaf blower ?

[miker]

As above, or would this just be silly, any advantages, just a thought:thumbup:

[Timbermcpherson]

You will find the fan has a sweet spot in RPM, upping the RPM will probably cause it to produce less air, not more.

[peatff]

They are governed to the sweet spot aren't they ?

[Stubby]

Have a word with Spud . Think he ported his .

[Tree Tastic Care]

I find that if you cover up the fan inlet a little bit, it ups the rpm for some reason ?

[kcstevens]

Have a word with Spud . Think he ported his .

Pretty sure you're right

 

Sent from my SM-G930F using Arbtalk mobile app

[dan494]

I find that if you cover up the fan inlet a little bit, it ups the rpm for some reason ?

Less air going in so less air resistance I'd imagine?

 

Sent from my SM-G930F using Arbtalk mobile app

[GardenKit]

The size of fan, inlet and spout are all finely balanced. If either the fan inlet or blowing pipe are restricted the fans load reduces and the revs increase.

 

Increasing engine revs by fuelling or porting reduces the blow, as the fan cannot grab enough incoming air, or get more air down the tube.

 

The science of fans is fascinating.

[Stubby]

The size of fan, inlet and spout are all finely balanced. If either the fan inlet or blowing pipe are restricted the fans load reduces and the revs increase.

 

Increasing engine revs by fuelling or porting reduces the blow, as the fan cannot grab enough incoming air, or get more air down the tube.

 

The science of fans is fascinating.

 

Bit like cavitation on a ships prop when it cant bite the water properly ?

[GardenKit]

Bit like cavitation on a ships prop when it cant bite the water properly ?

Very similar effect Stubby.

 

With a blower, if you block off either the inlet or outlet completely the engine comes off load as the fan has nothing to move. The revs will soar. Just like an outboard when you give it too much too soon and the prop just spins in its own little world, or a car engine when the wheels hit some slippery stuff.

You can actually use this to tune a blower as you can get it to 4 stroke under no load, which should then two stroke when working correctly and under load. Normally a blower is running on full load as soon as it is started.