Originally Posted by rvbuilder2002
Coming full circle back to this....
There has been discussion in the past regarding differences in the orifice restrictor diameter for the return hos on the VA-216 kit supplied hose assembly, and the specification listed in the Rotax install manual.
The orifice used by Van's in the VA-216 hose assembly is a standard off the shelf part supplied by Rotax.
It has a restrictor orifice that measures .020-.021" diam.
The install manual specifies that it be .014" diam.
It took a while, but I have finally been able to confirm (all the way back to engineering in Austria) that the specification in the install manual is an error and will be revised.
The Rotax factory supplied part with the .020 orifice diam. is the desired size, and will produce the desired amount of return flow.
Knowing this I need to amend my previous post.....
I believe the Flightlines kit uses a .014 restrictor as specified in the install manual. That being the case the return flow will be lower so the performance in that aspect will not be the same.
First off... Thank you Scott for checking into this further. I am glad that Rotax is fixing the published documentation so that it is accurate.
The ASFlightlines kit currently has a .015 orifice restrictor, which is .001" larger than the one that has been listed in the official Rotax documentation (and continues to be listed) since we first started doing Rotax hose packages. We will modify our package to utilize a .020 orifice restrictor to match the revised documentation that Rotax is planning on releasing.
We have done real world testing on an aircraft that had the .020-.021 restrictor installed and then changed over to the .015 restrictor. There was a slight difference in fuel flow and a minimal/almost negligible difference in fuel pressure.
We have also tested in real world application the difference in restrictor locations between our kit and the stock Vans kit. Location does not appear to have any appreciable difference on fuel pressures.
In short, the reasons that our kit appears to fix the low fuel pressures that SOME RV-12s are having does NOT appear to be due to the slightly smaller orifice restrictor or its location.
We are currently working on assembling a "modification package" which we will provide (***free of charge-see below***) to any customers utilizing our kit. It will consist of a #76 drill bit to enlarge the orifice from .015" to .020". We will offer this to anyone who has EVER purchased a kit from us and chooses to modify their restrictor.
We have modified our website with an order page already. If you go to the front page, it can be found under the "Manuals/Service Tab". We anticipate we will have the drill bits in stock no later than 5-1-2018 (hopefully sooner) and will enable online ordering as soon as we have them.
As always, thank you all so much for allowing us to earn your business.
Steve and Tom
*****FREE***** - Our payment provider doesn't allow $0.00 transactions for security reasons. So, the kit will be sold for $0.01.