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Author Topic: Ringed engine on pipe???  (Read 507 times)

Offline Gary Anderson

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Ringed engine on pipe???
« on: May 14, 2011, 06:01:12 PM »
Hi guys,

I have a couple of ringed 40 fsr engine and was wondering, will they run the same as the ABC fsr engine on pipe?? Will they turn as many rpm's?? Will the ringed engine hold up and have the same power?? I guess I could just go set one up and see what happens?? I don't want to see a engine blow up and throw pieces at everyone?? Why did they made the ringed version?? One reason I'm asking is cause there is a few new fliers at the field that have ringed engine and was asking me if they would work on pipe??
Gary
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Gary Anderson

Offline Peter Nevai

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Re: Ringed engine on pipe???
« Reply #1 on: May 14, 2011, 06:59:26 PM »
A tuned pipe works with most any two stroke engine. It's function is independent of piston configuration. As far as piston rings are concerned, its all about maintaining compression over wide temprature ranges vs macined tolerances and thermal expansion, etc. I recall that the FSR came in a RC helicopter version.   Perhaps that is where the ringed version fit in. RC helis had far less  airflow cooling available to them.
« Last Edit: May 14, 2011, 07:27:26 PM by Peter Nevai »
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Offline Steve Helmick

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Re: Ringed engine on pipe???
« Reply #2 on: May 14, 2011, 08:21:54 PM »
I don't know much about FSR .40's, but there could be a timing difference between the ABC/ABN version and the ringed version. Not that it would not work with a pipe, but pipe length would have to be different to suit the rpm range of the engine (per Randy's chart).

Like Peter said, there's no issues with the piston/cylinder configuration, shown by the fact that the new-ish Enya .61RE is only available ringed,  and is intended to work with either a pipe or a header muffler. Reports are that it works very well with either.  8) Steve 
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Offline Chris Wilson

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Re: Ringed engine on pipe???
« Reply #3 on: May 17, 2011, 06:07:11 PM »
Quote from: Gary Anderson on May 14, 2011, 06:01:12 PM
Hi guys,
I have a couple of ringed 40 fsr engine and was wondering, will they run the same as the ABC fsr engine on pipe?? 

I can't seem to locate a pic of your liner but does the ring version have a bridged exhaust port that is designed to keep the ring from being trapped during running?

If it does then I think that a pipe will run slightly differently with a bridged liner than an open one and I would expect the effect from the pipe to be softened slightly.
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