A-80

[flybikefarm]

I have the chance to aquire an A-80 continental with starter and generator. I would like to convert it to an A-75 and install on a short mount on my t-craft. Does anyone have a 337 for this or know if it has been done? George

[Vasey fan]

Re: A-80

I'm not aware of any A-series engines with provisions for starter & generator (except for the McDowell starter). Is it a legal motor?

If I recall correctly, you don't need a 337 for conversion back to an A-75, there are various notes in the engine TCDS concerning changing between 65, 75 & 80. I also recall something about not being allowed to convert -65/75 to -80 after a certain date.

[flybikefarm]

Re: A-80

The a-80-12 was used in a mooney mite and the stinson model 10. It is a legal motor. The reason I want to make it a 75 is because the 80 used pistons with five rings, and they where very heavy almost two pounds each with rings. Go to google and look up continental service letter M47-16. George

[Vasey fan]

Re: A-80

OK, I stand corrected. That means I learned something new today & can go home early.

[dmcneil]

Re: A-80

Hi George,

Are you sure you're looking at an A-80-12? As far as I know, Continental only made one A series engine in the -12 variant... that was the A-65-12. That engine had essentially a C series case which included the accessory case allowing a starter and a generator.

The A series engines (65,75 and 80) were available as -6 and -9 variants (up exhaust and down exhaust respectively). These -6 and -9 engines had an accessory case that allowed installation of a starter but not a generator.

If you look at that Continental Service Letter describing model changes (M47-16), it says that changing any A series engine to an A-80 is not allowed. Presumably, the converse would also be true.

Anyway, interesting subject. I'd like to know what you more you can find out about that A-80-12.

Dan

[astjp2]

Re: A-80

The A-80 was Decertified in something like 1947, so it was just optional items to change the A-65 to the 80 (pistons, RPM limits, and a few other minor part changes) You are better going with the A-75 because it will produce less heat from friction and the pistons weigh much less. Good luck Tim