O-235 engine

[Aclouston]

Wanting an O-235 in my plane and reading the instructions in the manuf. manual section IIL. My assumptions are that today:

1- it is still not possible today to fit a 235 with Bendix magnetos.

2- Dynafocal vs Conical should not be a deciding factor when a good engine comes up for sale (even if the project came with a mount).

3- An engine driven mechanical fuel pump is still unavoidable today, (for safety?)

4- if the engine came from a high wing plane with no mec. pump, best solution is to get an accessory case with machined pad, plunger timing gear and cam. (O-320 case).

5- Engine must come with a Marvel Schebler MA3-PA with acc. pump. (easy start in any weather). Otherwise it has to be primer pump installed on instr. panel.

6- if there is no provision for an oil cooler, I should avoid it. Not possible to retrofit.

Are all those assumptions still hold true today?

Given the opportunity, why would anyone not want a125hp O-235? Extra weight? Because they are all Bendix?

Thanks in advance

Allan

 

 

 

 

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[Kent Ashton]

15 hours ago, Aclouston said:

Wanting an O-235 in my plane and reading the instructions in the manuf. manual section IIL. My assumptions are that today:

1- it is still not possible today to fit a 235 with Bendix magnetos.

Quote

My knowledge of O-235s is very limited but I see that magnetos are available.  https://www.qaa.com/products/aircraft-magnetos/bendix-magnetos/bendix-magneto

3- An engine driven mechanical fuel pump is still unavoidable today, (for safety?)

Quote

I ran an O-320 using two Facet pumps--both for T/O, then one at a time-- and no mechanical fuel pump.   There was also enough head pressure to run the engine with the Facet pumps off but I did not test at full throttle, low altitude.

5- Engine must come with a Marvel Schebler MA3-PA with acc. pump. (easy start in any weather). Otherwise it has to be primer pump installed on instr. panel.

Quote

I would think that a primer would be a better option for a Canadian builder, it sprays the fuel into the intake just prior to the valves.  An accelerator pump puts it farther away in the intake and occasionally a backfire can cause a fire.  Cozy plans show an electric primer valve that is actuated to direct Facet pump pressure to primer fittings but a manual primer might be OK, too.

6- if there is no provision for an oil cooler, I should avoid it. Not possible to retrofit.

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Based on my experience with other Lycomings, and oil cooler is necessary and some way to block it off in cold weather is needed.  I imagine it is the same with an O-235.

Given the opportunity, why would anyone not want a125hp O-235? Extra weight? Because they are all Bendix?

Quote

I hear O-235 parts are more expensive.  There are a lot more O-320s available (or at least, used to be).  An extra 25 hp (O-320) makes a lot of difference too, and not an O-320 is not hard to build-for.  I don't see any good reason to use an O-235

 

 

 

 

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