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.

[facthunter]

IF the cable fails, the throttle goes to OPEN. Nev

[Blueadventures]

11 hours ago, Moneybox said:

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.

It could have been so easy for them as they have their patterns / casting method and could have just allowed for a bit more material so a larger diameter hole could have been made.  In my opinion they miss a possible opportunity to perhaps make an improvement on the Rotax design.  Opportunity missed , I say.

[Moneybox]

2 hours ago, Blueadventures said:

It could have been so easy for them as they have their patterns / casting method and could have just allowed for a bit more material so a larger diameter hole could have been made.  In my opinion they miss a possible opportunity to perhaps make an improvement on the Rotax design.  Opportunity missed , I say.

On the other hand they were smart enough to simply copy a well proved design just like the Japs did to produce some very successful post war motor vehicles.

[skippydiesel]

Just like the Japanese indeed - they only improved a design, where they think its worthwhile to do so.

 

A Big Balance tube serves no practical purpose, other than to lighten the wallet (this topic has been thoroughly discussed, elsewhere on this and the Rotax Owners Forum - its a gimmick!)😈