Bolt on Turbo Charger O-300

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Bolt on Turbo Charger O-300

Postby MoonlightVFR » Tue Jan 02, 2018 1:10 am

Twenty five plus years ago the aviation press was abuzz about adding turbo chargers.

I don't think it ever happened.

Why not ?

I remember being concerned about over boosting and blowing up a cylinder.

Are any Cessna 170s being legally operated with a turbo charger.

Advise
gradyb, '54 B N2890C
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Re: Bolt on Turbo Charger O-300

Postby 9976AJds » Tue Jan 02, 2018 6:16 am

Check with the experts, but RAJAY made several STC conversions for popular engines. I had one on a 225 Cont., in a Bonanza. EZ Manual Vernier control for maintaining 30 inches for take off and climb to 10K Plus. It worked great, also flew a AC 500A with RAJAYs no problems (1980's), too EZ. Find out who bought them out. Good Luck JD.
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Re: Bolt on Turbo Charger O-300

Postby n2582d » Tue Jan 02, 2018 2:13 pm

Mr. Doerstling has been trying to sell his experimental turbo 170B for about 10 years. I’m guessing there may be a reason it’s not selling like a pancake. In looking at a list of Rayjay STC’s it appears they don’t modify anything smaller than a IO-320. I think a major issue in adding turbo-normalizing to the O-300 would be high oil temperature. So you’d have to add an oil cooler. ... and a cabin heater ... and oxygen system ... . :lol: I’ve always wondered why the oxygen system was an option on the 170 ... who would ever operate it above 12,500’ for over 30 minutes? In looking closer at figure 107 I think I found the answer. Look closely at the rear seat outline. The oxygen system was designed be used for medical patients in conjunction with the optional stretcher in fig. 81.
A71F0096-05EB-49F9-82A7-DFB123791640.jpeg
Figure 107
Gary
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Re: Bolt on Turbo Charger O-300

Postby hilltop170 » Thu Jan 04, 2018 6:15 pm

Jacobs Engines never built a turbo version of their 7-cylinder R755 but a low-compression 245hp R755 Jacobs was turbo'd to 350hp, an increase of 43%. They are outstanding performers, getting up to 200mph TAS at 20,000' in C-195s.

I wonder if a crafty "experimental" guy might get the same % increase on the O-300 by using low compression pistons and a turbo?

145hp x 1.43 = 207hp

The O-300 crank is the same one used in the Continental IO-360 which goes to 210hp so the lower end should take it. The question is can the cylinders?

Maybe someone with an "airboat" engine will try it.
Richard Pulley
2014-2016 TIC170A Past President
1951 170A, N1715D, s/n 20158, O-300D
Owned from 1973 to 1984.
Bought again in 2006 after 22 years.
It's not for sale!
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Re: Bolt on Turbo Charger O-300

Postby ghostflyer » Fri Jan 05, 2018 12:28 am

While the crank shalf could be the same but the crank case has had a few changes for it to be a io-360 and other components also have had a tweak or 2. Oil temperature will be a problem [o-300] if the engine is performance enhanced . A number of years ago we received a set of new cylinders [ported and polished ,flowed] and some higher compression pistons . A remote oil filter was added with a heat sink added. A different exhaust was fitted . Every thing was balanced and a engine that really purred . BUT it had to have the best av gas around . This was done all legally via EO,s and STC;s.
Unfortunately the engine didn’t last long due to sabotage from a demented person . Unfortunately he had a stroke about a week later and the police could not take action . Wow I got off the subject of turbo changing.
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