hey guys very new to this gas thing, am building a byron corsair and was thinking on using there sachs 4.6 gas engine with the purr power system how well dose this engine work? reliability wise, preformance. maintance... is there another better set up for this plane? thanks would still like to use the 3 blade prop

Byron originally used the 4.2 Sachs made by A&M with Byrons's mechanical advance and a C&H ignition...The A&M version of a Sachs was compromised by the A&M crank, prone to early failure and vibration. Byron later used the Mustang 50 engine, not strong enough for a 3 blace prop..There is no 4.6 Sachs engine made...If Iron Bay is selling a 4.2 Sachs it must be one of the other manufacturer's versions, and will probably be using a C&H ignition with Syncro Spark, should be fine....

spoke to iron bay yesterday, they told me they were testing a new sach 4.6 engine on there system and that it has a larger crank whats dose this engine compair to like say a zenoah what?

There is no 4.6 Sachs that I'm aware of...Comparable engines would be ZDZ80, 3W 75, Q75, and other singles..Tried to call Iron Bay just now, the line was busy...

ok out of these engines the 3w, quadra, and zdz which would be the best? thanks

The Q75 has the same bolt pattern as the Purr-Powr and might work..A rear carb engine won't fit the Byron mount unless it's been reworked...