Zonsen Aero Engines - Rapture Aviation (Adelaide)

[Moneybox]

13 hours ago, Blueadventures said:

It would have been a good development to increase the cross over pipe at the time of doing the casting patterns for the intake manifolds as there is good feedback from those that do such about the smoother idle and possibility of operating at 50% power in the instance of one throttle cable / connection breaking and engine going to full power on one carby.  Would have been a good change to what Rotax have there in my opinion. (I'm open / planning to increase my R ULS balance pipe i.d. size.)

An interesting scenario, the possibility of running on all four with a broken throttle cable however I think that would be an unlikely failure on a regularly serviced engine. I think you'd need to do a lot of testing before you went to the expense of making casting patterns.

 

I've built plenty but molds but to cast a manifold is expensive. You first have to form the sand core in a mold. Then the core is fitted into the mold and the molten metal fills the cavity in between. Complex and expensive so you need to sell plenty to cover developments costs.