The performance change is dramatic. Climb is great and it really
shines on longer legs at 8-10K. I can get low 160's ktas at around
10GPH and have seen 172ktas in go fast mode. The big payoff for
me is not having to worry about parts anymore. I grew up in this
particular airplane, so my rationale for making such a financially
indefensible decision is somewhat unique. I plan to fly this
airplane until I hang it up. I think I have a lot of flying left
There are MANY variables that will affect the cost. Baffles, new or
used exhaust, control cables and of course the cost of the engine and
prop. Do not underestimate the value of a running E-series engine.
I had mine sold in less than 24 hours and got many calls after it
was sold. Working electric props are valuable, too.
Admittedly, I went all in with the 'might as wells' such as the BDS
baffles, new exhaust, new control cables and painting the engine bay.
I had been collecting E-series parts for a long time so my NET
cost was well under $60K. We don't talk about what those parts
cost me because they were bought so long ago, so I guess they were free.
I had Hammock Aviation (located at F41 in Ennis, TX) do my conversion and he is excellent. He has his sterling
reputation for a reason. I consider him a friend and still go to
visit when I fly from CT to my inlaws in KC for the holidays. He
has also done at least 15 of these, so he knows the ins and outs.
He also has jigs to get things lined up. He is also the STC
holder for the upgrade.
I don't think there is an option for a straight 35 except for the ARS
IO-470N cylinders on the E-225 case STC. I think you have to use
the Hartzell prop in that case. You also haven't really dodged any
E-series parts issues because you are still using the same case, crank,
cam, etc. Nice claimed performance boost, if you can use it
(mostly up high).
C35 Bonanza Owner