Just wondering what the best option would be when it come time to overhaul the engine? I do appreciate the benefits of having turbos. However living in the Midwest I don't know if the benefits out way the extra costs of the turbos. Here are my options:
1) Install a remanufactured TSIO-520 TBO: 1400 hours. The turbos were rebuilt 100 hours ago. They get rebuilt
every 1000 hours.
2) Install a remanufactured IO-520 TBO 1700 hours. Remove the turbos and make required modifications for the
IO-520.
3) Upgrade the engine to a STC'd IO-550 TBO 1700-2000 hours. Remove the turbos and make required
modifications for the IO-550.
TSIO 520 with RayJay manual turbos
0 You Like ThisModel: Bonanza V35B-TC
Posted 11/24/2019 - 2 years ago
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Good evening,
Those are three very different options with very different outcomes. My first question is always, "What's your mission?". If you find that you do not use the capabilities of the turbos much, then they are simply expense and weight that are doing you no service.
My vote would be for the normally aspirated IO-550. You will be into this option at roughly the same expense as keeping the TIO-520 and Turbo Overhaul. No V-tail owner has ever been disappointed with the performance or reliability of the 550 upgrade.
Curtis Boulware
ABS Tech Rep
Posted 11/24/2019 - 2 years ago
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I would eliminate TBO from the equation unless you are going to place 30-40 hours per month on the engine. I don't believe the stated TBO has much relevance for typical owner flown engines that get sporadic use.
Posted 11/25/2019 - 2 years ago
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I agree with Curtis, the TSIO engine was installed under an STC so converting to the IO550 is very simple. It will make a great aircraft and will eliminate many of the maintenance issues associated with the turbo system.
Bob Ripley
ABS Technical Advisor
Posted 11/25/2019 - 2 years ago
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