Glow plug failures

[Anthony Romano]

Bad info there pipe is at 25".

Interesting. Switched from no after run on stock bearings, which didn't last 
as long as the plugs, to SS with three of squirts of Mobil 1. Usually, had 
to pull the plug and spin the engine before I prime for the first start. Now 
using about one squirt of oil.
  Once you get some rust on the crank and rist pin should they be replaced?

Anthony

>From: "Henderson,Eric" <Eric.Henderson at gartner.com>
>Reply-To: discussion at nsrca.org
>To: <discussion at nsrca.org>
>Subject: RE: Glow plug failures
>Date: Wed, 12 Nov 2003 13:32:51 -0500
>
>You might be using too much after-run. I killed quite a few plugs that way. 
>Switching to stainless bearings and using only two drops of after run (for 
>the crank) stopped killing the center pin. Too much compression with the 
>pure oil.
>
>Eric.
>
>-----Original Message-----
>From: discussion-request at nsrca.org
>[mailto:discussion-request at nsrca.org]On Behalf Of Anthony Romano
>Sent: Wednesday, November 12, 2003 1:29 PM
>To: discussion at nsrca.org
>Subject: Glow plug failures
>
>
>
>
>Have an Os 1.40 that has a pretty healthy appetite for glow plugs. First,
>was blowing the seal so I added a head shim and pulled out the pipe a
>little. Now the just seem to loose conductivity. Engine runs fine but go to
>restart for next flight and nobody home. Typically lifespan is about 30
>flights.
>Using Type F, S&W 20% nitro 16%syn 2%castor fuel, Es pipe at 23" with Mac 2
>1/"4 header, Apc 16.5 *12W resulting in a peak setting around 8100 and a
>launch setting of 8000. Have another head shim on order and will try a
>little longer pipe if the weather ever improves. Any other suggestions?
>
>TIA
>
>Anthony
>
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