soarrich
Posts: 2502
Joined: 2/1/2002
From: Middletown,
NJ, USA
Status: offline
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No problems with the header yet, I don't expect any, this is not flex gas line that it looks like.
I don't do rpms anymore, in the spring I did that and got really big numbers on rpm and thrust, then could not reproduce them and looked stupid. I turns out it was too winding to fly, so I did rpm and thrust test, you will get great readings in the wind even a small amount of wind throws the numbers way off. Now I use the tach to peak the engine, but I'm not overly concerned about the number, I just want to maximize it. I've found that some props that got great numbers didn't really fly the plane well, and other props that didn't get great numbers flew very well.
I'm running the canister which I'm pretty sure cost you about 200 rpm, but is half as loud as the stock muffler. I don't like loud engines, so some performance penalty is OK with me. I haven't run a pipe since the spring when I did the rpm and thrust test, it was too loud for a enjoyable time and that is what I'm looking for, not to scare the deer and geese out of the park.
I've got about 15 gas engines, 5~6 that I run a lot, in the last two years doing gas I've learned a few things:
Fly the prop before you praise or rag on it.
Piston port induction engines ALL need a velocity stack, reed valve engines don't much care if they have one.
Baffle your cowl for better airflow through the engine's fins.
Keep the carb out of the slipstream.
Keep the prop tip speed down below 450 mph, which is about a 23 inch prop doing 6600 on the ground, after that they get noisy quickly.
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Rich Border
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Gas Engines >> How are all you MT57 users making out? 
How are all you MT57 users making out? - 
until i can get a new pipe. and this time i will try a 15" header instead of a 11" as recommended by Pe,that is with a MTW pipe,he said there will be a big difference in performance. 
