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Author Topic: O.S mufflers for the old .40S engine??  (Read 3723 times)

Offline frank mccune

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O.S mufflers for the old .40S engine??
« on: July 09, 2015, 12:30:28 PM »
    Hello All:

    I am looking for mufflers to be used on the old O.S..40S engines.  I think that they were a model 704 from O.S.

    Anybody have mufflers for sale that will fit these old O.S. engines?


                                                                                                    Tia,

                                                                                                    Frank McCune
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Offline Target

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Re: O.S mufflers for the old .40S engine??
« Reply #1 on: July 09, 2015, 02:34:04 PM »
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Offline Steve Helmick

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Re: O.S mufflers for the old .40S engine??
« Reply #2 on: July 09, 2015, 06:54:55 PM »
Is this the baffled piston ball bearing "H.40" series? There were S, P and R/C versions, IIRC. There was also an official OS .40FP-S, hence my confusion. If it's the .40FP-S, anything that fits a .35FP, .40FP, .40LA or .46LA will work. Otherwise, I'd talk to Randy Smith after the NATS, and see what he can suggest. I really like his CNC tube muffler...but I drill and tap them for pressure, usually.   H^^ Steve
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Offline M Spencer

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Re: O.S mufflers for the old .40S engine??
« Reply #3 on: July 09, 2015, 08:13:44 PM »
I think you mean the ' Jetstream ' ,



same fit as 30 , 35 etc , Some cases are lugged & tappeed for these , later ( mid 70s ? ) arnt .



cording to this the 703 is the 35 / 40 job . ( these are the later type )



could find you a few of them , but we're ' across the water ' .



pictures are filched . Youd need to CLEAN any Ive Got ! .  ;D
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Online Trostle

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Re: O.S mufflers for the old .40S engine??
« Reply #4 on: July 09, 2015, 08:39:42 PM »
Quote from: Matt Spencer on July 09, 2015, 08:13:44 PM
I think you mean the ' Jetstream ' ,


I think the Jetstream muffler was primarily for the OS 35S and the OS 30S.  Which were nice engines before OS came out with the H model series and then the FP series.  The Jetstream bolted inside the exhaust stack.  It is light and is an effective muffler.

I really do not know what the OS 40S is.

Keith
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Offline Avaiojet

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Re: O.S mufflers for the old .40S engine??
« Reply #5 on: July 10, 2015, 04:57:51 AM »
Frank,

I have some, I'll take a look.

Footprint has to match up.
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Offline Bill Johnson

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Re: O.S mufflers for the old .40S engine??
« Reply #6 on: July 10, 2015, 06:12:50 AM »
Frank, if you register on the RC Groups.com forum and post a WTB there, you'll probably get several offers. A 703 muffler with strap just sold for $8. I picked one up there for $10 a month ago. That form is a great place to find old engines and parts.

Another option is buy just the strap, and it can be the OS or the Enya. I prefer the Enya because it uses the existing holes on a muffler while the OS requires a tapped hole on the side. Then buy a tongue muffler. To get the right tongue muffler, get the dimensions of the exhaust port width and you can figure out which Brodak muffler will work. I have the hole spacing on all their mufflers.
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Offline Robert Zambelli

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Re: O.S mufflers for the old .40S engine??
« Reply #7 on: July 11, 2015, 08:08:20 AM »
Frank: If you post the exact center-to-center distance, I can tell you if there is a Brodak muffler that will fit.

  Bob Z.
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Offline YakNine

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Re: O.S mufflers for the old .40S engine??
« Reply #8 on: November 25, 2015, 07:36:49 PM »
Mac's makes a strap on muffler that fits perfect , I have an Rsm tongue on another one that is drilled through the case for bolts.T.J.
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