Need Feedback on O.S 1.60 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 12-20-2005, 06:55 PM   #1
always flying
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Need Feedback on O.S 1.60

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Hello fellas,

I recently purchased a O.S 1.60fx and bission pits stlye muffler!! Was wondering who is running theirs with the perry pump and why? AND ...who is running theirs with out and what kind of results?

The reason i'm asking is i've read so many different ractions when it comes to this point...some say "i wouldn't run the engine with out he pump" others say "why do you need it" i hear so many people run with the pump!...i guess i just need to know why with the 1.60 over any other motor!!

Thanks any feedback is appreciated!!

merry X 'mas !

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Old 12-20-2005, 07:10 PM   #2
Ken Currell
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I have four engines that run with a pump but they also have carburetors designed to run on a pump.

Two are 2 strokes and 2 are 4 strokes.

If I tried to run my 2 strokes without the pump they wouldn't idle at all. The bore in the carburetor is too large.

I have a perry pump and the literature supplied with it says you need to use a carburetor made for the pump.

With the pump carb you will get wore horsepower and you will also get a more reliable fuel supply. You can mount the fuel tank farther away from the engine near the centre of gravity and still get proper fuel feed.
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Old 12-20-2005, 11:05 PM   #3
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It's not the engine it's the muffler.

Early mufflers designed by Bisson have the exhaust stacks to big to allow sufficient back pressure to pressurize the tank. Bisson corrected the problem on newer mufflers.

I had an OS 1.60 with the older style muffler and couldn't get it to run through a full tank, without a flameout, until I took some silicon tubing used for tuned pipes and through the use of three different sizes restricted the exhaust stacks down to 1/4" diameter each. After that the engine never skipped a beat.

You can do same thing by fitting a slightly smaller size wood dowel into one of the exhaust stacks and bolting it in. Or use a Perry Pump and leave the muffler alone.

The OS 1.60 with the stock OS muffler does NOT need the Perry Pump.
Jim Daly
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Old 12-21-2005, 04:34 AM   #4
Don M.

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My answer is simple. I have an OS 1.60 WITH a Perry pump. I can put my fuel tank where ever I wish, the engine runs the same with fuel tank full or empty, the engine runs the same right side up, upside down or sideways, I can use any muffler I wish, the pump only costs $50.00 and is a plug & play install. Why in the world would I want to run WITHOUT a pump, doesn't make any sense to me.
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