Pipistrel on Fuel Vaporisation

[skippydiesel]

I will have to go back & check what I wrote some many moths back but from geriatric memory Rotax recomend a Mikuni  #35 Restrictor Jet.

 

My original return fuel rate was 7.6L/hr at about 3 psi

I later installed a small jet which did not solve my problems at the time (low fuel pressure during climb out).

Later again a read the Vans document below - sounded similar to my problem - went out & purchased a new higher capacity Boost pump - worried about overpressure - reinstalled the #35 restrictor jet - all good!

I also redesigned/plumbed my three tank fuel system, so I can choose (which I do) to use the tank with the return flow for all ops (previously couldn't).

 

https://www.vansaircraft.com/wp-content/uploads/2018/12/Notification-2018-07-12.pdf

The RV-12 recommended Facet Cube, PN 40135, delivers Pressure Max/Min 7.0-4.0 psi and 32GPH (US) .

This is well above Rotax recommended Max 4.5 psi

https://facet-purolator.com/specifications/

 

Mikuni web - https://mikunioz.com/shop/bs3096-pilot-jet-bleed-type-for-cv-carbs/?v=13b249c5dfa9

 

I used the VM22 style (that was originally fitted) but on reflection the N151.067 might have been a better bet. Jet fitted in to the end of one of the spigot tube push on fittings.

 

In short the return line restrictor jet selected will be governed by the fuel system configuration, Boost & Mechanical pump performance