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I think I have a bad top mag. I want to replace it, but was hoping I could get a super fast turnaround on a new one, so wondering if anyone knows what mag the Aerovee is using. I'm happy to buy from Sonex, but if I can get one shipped overnight from another supplier then I'd like to do that.

Mike Smith

It's a Briggs and Stratton part...not sure what the part number is but you might get a match at a small engine shop.

I think this is it. 33-345.

http://www.amazon.com/Oregon-33-345-Ign ... B0009XHKDS

That would be an awesome amazon review.

Bryan Cotton wrote:That would be an awesome amazon review.

Yea... "Worked great in my airplane! Highly recommended if you have a Volkswagen airplane engine"

Mike

The part number for the Briggs & Stratton "Armature-Magneto" is 394891.

Msing48 wrote:The part number for the Briggs & Stratton "Armature-Magneto" is 394891.

That model # was superseded by 590781. But that is not a match for the current mag. The center portion is different, and the wires exit in a different location. The 33-345 I noted above, appears to be the model that matches the current AV mags.

Mike

mike.smith wrote:

Msing48 wrote:The part number for the Briggs & Stratton "Armature-Magneto" is 394891.

That model # was superseded by 590781. But that is not a match for the current mag. The center portion is different, and the wires exit in a different location. The 33-345 I noted above, appears to be the model that matches the current AV mags.

Mike

Yup. This is the replacement part. I just got it today and it matches.
http://www.amazon.com/Oregon-33-345-Ign ... B0009XHKDS

Mike Smith

mike.smith wrote:I think I have a bad top mag. I want to replace it, but was hoping I could get a super fast turnaround on a new one, so wondering if anyone knows what mag the Aerovee is using. I'm happy to buy from Sonex, but if I can get one shipped overnight from another supplier then I'd like to do that.

Mike Smith

Just curious. What is the failure mode of a mag like that?

SvingenB wrote:

mike.smith wrote:I think I have a bad top mag. I want to replace it, but was hoping I could get a super fast turnaround on a new one, so wondering if anyone knows what mag the Aerovee is using. I'm happy to buy from Sonex, but if I can get one shipped overnight from another supplier then I'd like to do that.

Mike Smith

Just curious. What is the failure mode of a mag like that?

Well, in this case nil. I thought is was a bad mag, but it was a reversed magnet on the flywheel (see my Primary Ignition posts). But that mag I bought is a drop-in replacement for the one Sonex provides, as I ran the engine on it today and it works great.

The magnetrons are very simple devices. It's a bunch of coiled up copper wires! So the failure mode has got to be very, very low.

Mike Smith