REFLECTOR: Engine backfiring

[Dave Philipsen]

Here's a question perhaps for some of the engine experts:  I've got a 
STD FG with IO360-A1A engine.
It has one standard magneto and one Jeff Rose electronic ignition.  The 
engine and oil cooling are not a
problem even with OATs in the low 90s. But, I have a problem (it's not a 
huge problem) with backfiring
during taxi *after* I land.  Taxiing before takeoff seems to be ok.  The 
backfiring happens maybe once
every 30 seconds or so.  The engine also seems to run a little rough at 
this time.  I've tried running lean,
running rich, running on just the magneto, running on just the 
electronic ignition.  None of these seems to
prevent the backfiring during taxi.  The engine never seems to have 
problems before or during takeoff or
during cruise or descent...just taxiing back after landing.

I'm starting to think it's a vapor lock problem or something since the 
fuel flow is way down and the fuel is
sitting in the lines longer and heating up.  I had the cowling off the 
other day and was checking the routing
of the fuel injector lines and they don't appear to be routed near the 
exhaust manifolds or anything like that.
I was thinking of maybe experimenting with some insulating material 
around the individual injector lines as
well as the main fuel line.  Any ideas?

-- 
Dave Philipsen
STDFG
N171SP