Fw: Aeroslave pipe set-up <clipped>

[Lance Van Nostrand]

Colin,
Well we're making progress, but your data does not match most OS140RXs.  A duel plug head will help a bit, but that's a step to refine a good setup, not make a good one from a touchy setup.  The touchiness you describe and the rich midrange on such a long pipe gives this problem away.

What elevation do you fly at?  You may be at a veyr high altitude, which is influencing the tuning and will require less pump pressure.  The other scenario is that your engine just came from the factory with a bit too much pump pressure.  Either case, the solution is the same.  You have too much pump pressure.

Depending on how meticulous you want to be there's the 80/20 rule or the 99% rule.  for 80/20, unscrew the pump screw 3/4 turn and richen the idle a little bit.  This will be close and you should find the pipe setting much less touchy. use the techniques earlier to find the right length.  Since length is directly related to port timing, the ideal length should not change theoretically, but I think you are longer than ideal because your bigger problem is too much pump and you are way off the ideal pipe length just to lean the midrange.  If you want to confirm that the baffles were put in correctly, insert a small dowel down the neck past the first angle to the main baffle.  Let me know the distance.  Also, the distance the front of the angle baffle.  The other setup option is to set it to 31" and reduce the pump pressure until you get a good midrange, then test fly and listen to see if it sags on uplines.  If so, increase pump until it runs consistent.  thi smight require a small access hole in your firewall to simplify adjustments.
--Lance

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