To understand where I'm coming from, I haven't done any experimenting at all with mufflers. My view is the only reason to even use a muffler on a 4 stroke is to give you a pressure tap for the tank. The small CL muffler is just a tube with a pressure fitting and I haven't seen any difference between using it and the stock 56 RC muffler which is a bit larger and has a baffle.
I've never owned a 72 but am pretty sure the exhaust pipe is larger than the 56. For this reason I would guess the muffler you are thinking came off a 72 is really the one supplied with the RC versions of the 56 and 62.
Hi Bob;
Not sure of the vintage, but any Saito .56s that I have seen new in the box has the big die cast baffled mufflers. I have looked at Horizon's web site trying to figure it out, so I could buy a new one if needed, and while they are listed separately, they don't denote what engine they are for. I think I saw during my search that the .72 still used the 10mmX1 threaded fittings, so that's what my uneducated wild guess is based on. Then I just decided to make up some copies because I could and had the material. The muffler on the Score is so quiet, you can have a normal conversation with someone outside the circle! After listening to 2 strokes for a lot of years, you begin to equate power with certain sound levels, and that's one part of my learning curve with the 4 strokes. Sometimes they don't sound like they are making enough power to pull your hat off your head! But when you crank in the up for that first wing over, up she goes!
Again, this isn't a rant or rave or complaint, just curious what you other guys are doing, and does different mufflers make a difference in tuning. I've pretty much been using your set up in my engine and will continue with it as the basis for the next model. I've got a used .56 and a brand new in box .62 for the next plane, now that I have reached a certain confidence level with these things.
Great fall flying weather here this weekend! Got things to do today, but don't nobody be in my way to the field in the morning!
Thanks a lot,
Dan McEntee