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Approved engines for replacing O-320 A1A?
Beginning to look for a replacement engine for my 55 PA22-150.
The current (original) engine is an O-320 "no dash" equivalent to the A1A.
What other variants would be legal to install?
I have a lead on an A2B (-32 carb, straight iol riser) and need to know if it could be bolt in as far as legal is concerned.
Thanks,
GG
PS, from wiki:
O-320 (No suffix) later redesignated O-320-A1A150*hp (112*kW) at 2700*rpm, Minimum fuel grade 80/87*avgas, compression ratio 7.00:1. Provisions for a controllable-pitch propeller and 25-degree spark advance.
O-320-A1B150*hp (112*kW) at 2700*rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as A1A but with straight riser in oil sump and -32 carburetor.
O-320-A2A150*hp (112*kW) at 2700*rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as A1A but with fixed-pitch propeller.
O-320-A2B150*hp (112*kW) at 2700*rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as A2A but with straight riser in oil sump and -32 carburetor.
O-320-A2C150*hp (112*kW) at 2700*rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as A2B but with retard breaker magnetos.
O-320-A2D150*hp (112*kW) at 2700*rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as E3D but with conical mounts.
O-320-A3A150*hp (112*kW) at 2700*rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as A1A but with 7/16" prop bolts.
O-320-A3B150*hp (112*kW) at 2700*rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as A3A but with straight riser in oil sump and -32 carburetor.
O-320-A3C150*hp (112*kW) at 2700*rpm, Minimum fuel grade 80/87 avgas, compression ratio 7.00:1. Same as A3B but with retard breaker magnetos.
O-320-B1A160*hp (119*kW) at 2700*rpm, Minimum fuel grade 100/130 or 91/96 avgas, compression ratio 8.50:1. Same as A1A but with high compression pistons.
O-320-B1B160*hp (119*kW) at 2700*rpm, Minimum fuel grade 100/130 or 91/96 avgas, compression ratio 8.50:1. Same as B1A but with straight riser in oil sump and -32 carburetor.
O-320-B2A160*hp (119*kW) at 2700*rpm, Minimum fuel grade 100/130 or 91/96 avgas, compression ratio 8.50:1. Same as B1A but with fixed-pitch propeller provisions.
O-320-B2B160*hp (119*kW) at 2700*rpm, Minimum fuel grade 100/130 or 91/96 avgas, compression ratio 8.50:1. Same as B2A but with straight riser in oil sump and -32 carburetor.
Sent from my SM-G955U using ShortWingPipers.Org mobile app
Glen Geller
1955 PA22-150 "One For Papa!"
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Re: Approved engines for replacing O-320 A1A?
Well I just checked the TDCS and the O-320 -no suffix, -A1A, -A1B, -A2A, -A2B are all approved (with specified carburetors.)
Never mind...
GG
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Re: Approved engines for replacing O-320 A1A?
Yes...so those are the easy drop-in replacements. But the carburetor application chart shows different carbs applicable to some versus others of those models, so make sure you have a carb that matches the new engine.
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Re: Approved engines for replacing O-320 A1A?
I'd like to know, too. Are all the engines listed above a direct and legal replacement for the A1A? Or, the "no dash"? I'm assuming the carbs that came with each engine are also required. If that is a bad assumption, and all carbs are interchangeable to all engines, please advise.
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Administrator
Re: Approved engines for replacing O-320 A1A?
Yes, they are listed on the Type Certificate Data Sheet. You can also reference the Lycoming O-320 TCDS to see the differences in the different models and there are ways to convert one model to another by simple changes.
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Re: Approved engines for replacing O-320 A1A?
The carburetor most likely is installation specific. Be sure you get one of the specific engine models with the carburetor listed. If the engine was installed in a different aircraft model, it may have a different carburetor.
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