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Stoots Prime IO-370 195 HP

Congratulations!
 
Aeromot said:
No issues arose in its first annual. The stays he made to locate the tailpipe had both cracked, but the tailpipe had decided it wanted to be where we wanted it, so the stays are no longer necessary. The mags needed to be re-timed, and one of the rear cylinders needs a little more break-in. He found one drop of oil in the cowl, which he compared to a slightly newer 172, that came in with an O-300 and "leaked everywhere." The owner spent almost $2000 fixing that and it still leaked a little. Our engine still looks new..

Neither my son nor I were able to help with the annual this year, but with a new MLG tire and a new ELT battery the total was only $1200. I believe he charges $700 for the basic inspection.
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That first annual after a new engine is nerve wracking. You never know what's going to pop up. Yours sounds pretty clean. That is very inexpensive, my place charges about twice that for the basic inspection. But good A&Ps are rare, they do a thorough job and I trust them. Regarding breakin, my new O-360 had stabilized oil consumption within the first 4 hours. But the high metals in UOA didn't taper down to normal until 400 hours.

Speaking oil leaks reminds me that mine developed one about 1-2 years in. Turned out to be the crankshaft nose seal. It's an expensive repair because to do it right with a 1-piece seal the prop must be removed & reinstalled. Penn Yan paid for all of it under warranty.
 
Stoots just issued a new and more detailed AFM. It clarifies a few operating points.
 
www.flyingmag.com

Navigating the Lure of Added Power

I never would have guessed that adding 20-30 hp to a standard 172 would have such a dramatic effect on the overall flying experience.
www.flyingmag.com www.flyingmag.com
 
Aeromot said:
www.flyingmag.com

Navigating the Lure of Added Power

I never would have guessed that adding 20-30 hp to a standard 172 would have such a dramatic effect on the overall flying experience.
www.flyingmag.com www.flyingmag.com
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It seems well worth the money we spent every time our 195-hp 172F airplane takes off. (I have current comparisons because I am doing my instrument training in CP Aviation’s 145-hp planes.)
 
BananAppeal said:
It seems well worth the money we spent every time our 195-hp 172F airplane takes off. (I have current comparisons because I am doing my instrument training in CP Aviation’s 145-hp planes.)
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The 180HP engine that I installed in mine made a noticeable performance improvement with no loss of efficiency. I can only imagine what another +15 HP is like.
PS: the article mentions $90k for the 195 HP engine all-in. Mine was about half that, done in 2018.
 
As you can see from the dates of the posts, ours was done in 2022 and 23. Except for the prop, which had a big price increase right after we paid for it, most of the kit prices had already climbed to their post pandemic levels.
 
The engine had its first squawk during the annual this week. The crankshaft seal was weeping ever so slightly. He replaced the seal, install installing it with the required sealing goop. The goop had not been used at the factory, which was the reason it was leaking.
 
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Aeromot said:
The engine had its first squawk during the annual this week. The crankshaft seal was weeping ever so slightly. He replaced the seal, install installing it with the required sealing goop. The goop had not been used at the factory, which was the reason it was leaking.
Click to expand...
Crankshaft nose oil seal? Don't the one-piece seals require removing the prop? That's a big job. I know because the same happened with my O-360. Penn Yann paid for that under warranty - kudos to them. You can get 2-piece split seals but I've read they don't seal as well. Maybe that depends on the engine.
 
MRC01 said:
Crankshaft nose oil seal? Don't the one-piece seals require removing the prop? That's a big job. I know because the same happened with my O-360. Penn Yann paid for that under warranty - kudos to them. You can get 2-piece split seals but I've read they don't seal as well. Maybe that depends on the engine.
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That's the one. The prop did come off, and it was a relatively expensive annual. I guess we could ask Continental for warranty compensation, but we probably won't.
 
When we returned from Catalina last weekend, there was a bit of oil coming out near the spinner and misting onto the windscreen. Art says it’s a minor thing and not much oil, but I wasn’t comfortable about it even before I say this exchange and was reminded this wasn’t the first time we’ve had a leak in that vicnity
 
Continental has announced a program where many of their engines are kept in stock so that if you have an engine that needs to be replaced or overhauled, you can get one very quickly. I'm pleased to see that the IO-370 seems to be at the top of the list:

Stock Engine Availability | Continental Aerospace Technologies™

View the current list of in-stock engines from Continental Aerospace Technologies™. Find certified engines ready for immediate delivery and installation.
continental.aero continental.aero

avbrief.com

Aero 2026: Continental Introduces FastTrack Engine Replacement Initiative - AvBrief.com

Ready-to-install replacement engines now in stock.
avbrief.com avbrief.com
 
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In fact, it's the ONLY engine on the list at the moment. May you never need it!

Speaking of crank shaft oil leaks, I have one behind my Hartzell 3-blade. Because the nuts are 1-time use only, I had to find the part number and supplier. Tech support told me exactly which nuts and O-ring I need and gave me the part numbers. Then told me they have no stock for the nuts. They have a preferred dealers page on their site and fortunately, one of them had both in stock for a decent price of approximately $16 x 6 nuts and another $5 for th O-ring. So for $100 I got them on the way.

Somewhere along the line I came across this service bulletin on the very same nuts I had ordered moments before. A-2044 hex nuts in stock that were shipped from Hartzell Prop between 12/8/2025 and 2/4/2026 are affected. The attached document tells you how to determine if you have the bad nuts but fortunately it was a small window.

Just wanted to share an important SB.
 

Attachments

  • Hartzell Service Bulletin on Prop Nuts HC-ASB-61-410.pdf
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