Actually found my original technique was poor and was able to use Dales
advice of timing a different piston to the upper case split. Right on @ 30
and 28deg per spec. Thanks to all who advised.
"Rip" wrote in message
...
Dick wrote:
The specs for my C-85 are upper plugs mag @ 28* BTDC and lower @ 30*BTDC.

My results are upper @ 30* BTDC and lower @ 32* BTDC.

I couldn't find a "flower pot" with attached degree wheel to borrow and
attach to the prop hub so used a little "mickey mouse" circular
protractor with a free swinging needle/pointer.

Two separate readings confirmed my 30-32. TDC was identified and impulses
unloaded before taking the readings.

My question is whether my results are acceptable for a low speed ,
experimental or need to be readjusted??

If need to be redone, I'd appreciate a little on why, please.

Thanks, Dick

PS: If listening G, I think "highflyer"(?) gave me some mag advice
during an "annual" a few years back which was appreciated.
Teledyne Continental has issued MSB94-8C-1. With rare exceptions (mostly
for turbo'd engines), the magneto to engine timing tolerance is +/- 1
degree.

Your results, per the manufacturer, are one degree out of specification.

Rip
A&P/IA