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Magnetos, Ignition Coils and Spark Plugs Discussion about magnetos, buzz coils, spark plugs, ignitors and low tension coils.

Magnetos, Ignition Coils and Spark Plugs

Continental R670 Radial Magnetos


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  #1  
Old 01-14-2018, 12:29:15 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Continental R670 Radial Magnetos

I have a R670 radial removed from a Stearman, replaced with a Pratt & Whitney 9 cylinder for crop dusting. Plans are to have a running display for the aircraft museum, one of our local shows is tied to a fundraiser for them. I went to the state surplus auction yesterday and found a test propeller, while I was looking at them an older gentleman asked what I had planned for them, I told him about the engine. I said I needed the prop and hub, magnetos and a starter. He said he had an inertia starter for it and I could have it. I'll be in touch with him next week, hope he still has it and it works, I need two 7 cylinder magnetos now. If anyone can help please let me know.
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  #2  
Old 03-13-2018, 08:46:23 PM
tdmidget tdmidget is offline
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Default Re: Continental R670 Radial Magnetos

If that engine has logbooks or if you can get them it will be worth a LOT more as a core than a display. We are talking serious money here.
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Old 03-13-2018, 08:56:14 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: Continental R670 Radial Magnetos

The stand is about finished, I found two mags and an inertia starter for $300. I traded this engine for a small marine engine, owner had two of them. I don't know if there are any log books, they were removed from a Stearman, replaced by 9 cylinder 400hp Pratt & Whitneys. Below is a link to an inertia starter in use, if you watch it be sure your volume is on. I hope this engine isn't too hard to start, looks like it would wear you down quickly, but I think it would be a good attraction.

https://www.youtube.com/watch?v=3zXkVQnVmuo

Last edited by J.B. Castagnos; 03-13-2018 at 09:02:21 PM. Reason: added text
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Old 03-13-2018, 09:37:29 PM
tdmidget tdmidget is offline
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Default Re: Continental R670 Radial Magnetos

It's worth looking in to. That engine, rebuilt, is $35,950 without an exchange. With exchange it is $6,000.00 less. So, with no logs but only a complete engine it is worth $6,000.00. That price is from the certificate holder and others might pay more.
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Old 03-13-2018, 10:55:25 PM
Vanman Vanman is offline
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Default Re: Continental R670 Radial Magnetos

Being that I am nothing more than an armchair pilot, I have to ask why the engine swap? More hp, I presume? Or lower fuel consumption? Or? Just curious.

Oh, I forgot- I've seen that video a few times, and I love it!

Last edited by Vanman; 03-14-2018 at 01:14:56 AM.
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Old 03-14-2018, 01:20:42 AM
cobbadog cobbadog is offline
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Default Re: Continental R670 Radial Magnetos

My first view of an inertia starter. It sounds and looks different and is very interesting. Thanks for posting and look forward to any other pics and progress.
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Old 03-14-2018, 02:15:42 AM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: Continental R670 Radial Magnetos

Quote:
Originally Posted by Vanman View Post
Being that I am nothing more than an armchair pilot, I have to ask why the engine swap? More hp, I presume? Or lower fuel consumption? Or? Just curious.
The Stearman was a bi-plane used as a trainer plane by the Navy in WWII, the 240HP engine was adequate for the plane alone but when used as a crop duster was dangerous with the extra load. It appears this engine never had a starter, the block off plate was held in place with nuts and pal nuts, I read that many of these were propped off, no fancy extras.
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Old 03-14-2018, 05:22:19 AM
Phil P Phil P is offline
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Default Re: Continental R670 Radial Magnetos

Hi

The P&W R-985 9 cylinder radial aircraft engine is rated at 450 HP.

Phil P
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Old 03-14-2018, 01:36:47 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: Continental R670 Radial Magnetos

Here's pics of the inertia starter and the engine on the stand. The starter is compact, but being aviation I guess it had to be. It reminds me of the GM R4 compressors. I read about them, they say the flywheel spins up to 12,000 rpm.
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Old 03-14-2018, 02:06:58 PM
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Default Re: Continental R670 Radial Magnetos

450 vs 240 must really wake the ol lady up!

I was familiar with electric inertia starters from watching old military training films. But that video is the only time I'd seen a hand cranked one. It looks and sounds like it would be in a cartoon! But there it is, in real life! I love it!

That museum is close to here. I used to go there to buy aviation gasoline for my dune buggy. Back when I cringed at the price of $1.65 / gallon! Ah good times.

I've been to an air show once or twice there too. Also Miramar, south of here.
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Old 03-14-2018, 02:28:11 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: Continental R670 Radial Magnetos

I believe that's where they got the sound for the Tasmanian Devil on the Bugs Bunny cartoons.
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Old 03-14-2018, 07:04:37 PM
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Default Re: Continental R670 Radial Magnetos

Nailed it! Just cranked a little more smoothly.

https://m.youtube.com/watch?v=c54SvkgQ04A
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Old 04-05-2018, 10:36:56 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: Continental R670 Radial Magnetos

Got the radial running, just in time, show this weekend at the museum grounds. Here's a link.

https://www.youtube.com/watch?v=O9QMTn0b_bY&fea
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Old 04-05-2018, 11:10:37 PM
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Default Re: Continental R670 Radial Magnetos

Says video is unavailable...

Very much looking forward to seeing this. I've long wanted an aircraft powered by two big, powerful radials. One of my favorite engine types.
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Old 04-06-2018, 04:51:19 AM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: Continental R670 Radial Magnetos

Can anyone else open the video, it's working for me.
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Old 04-06-2018, 05:37:20 AM
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Elden DuRand Elden DuRand is offline
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Default Re: Continental R670 Radial Magnetos

All I get, J.B., is a black screen with a circled exclamation point where the video should be.
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Old 04-06-2018, 05:37:40 AM
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Default Re: Continental R670 Radial Magnetos

Quote:
Originally Posted by J.B. Castagnos View Post
The Stearman was a bi-plane used as a trainer plane by the Navy in WWII, the 240HP engine was adequate for the plane alone but when used as a crop duster was dangerous with the extra load. It appears this engine never had a starter, the block off plate was held in place with nuts and pal nuts, I read that many of these were propped off, no fancy extras.
Hi

I have over the years hand or Prop started many of the 7 cylinder Continentals and the 9 cylinder Pratt & Whitneys.

Phil P
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Old 04-06-2018, 08:25:33 PM
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Default Re: Continental R670 Radial Magnetos

JB
I have been running a few radials for years, they are always a hit at the shows.
Here is a link to a video for a W670 that I got running a few weeks ago. It was in a tank or something, been sleeping for 40 years or more. There is another in my avitar. I can't get you video to work either.
https://www.youtube.com/watch?v=qatbsjAI340&t=9s
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Mike
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Old 04-06-2018, 10:53:27 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: Continental R670 Radial Magnetos

Try it again, it was tagged private, I think I have it corrected.

https://www.youtube.com/watch?v=O9QMTn0b_bY&fea=
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Old 04-07-2018, 03:40:01 PM
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Default Re: Continental R670 Radial Magnetos

Nothing beats the sound of a radial!
Thanks for saving another piece of history!
Great video also.
Thanks
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