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Engine basics => Engine set up tips => Topic started by: frank mccune on July 09, 2015, 12:30:28 PM

Title: O.S mufflers for the old .40S engine??
Post by: frank mccune 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
Title: Re: O.S mufflers for the old .40S engine??
Post by: Target on July 09, 2015, 02:34:04 PM: This document may help-
http://www.osengines.com/parts/engine-specs-discontinued.html
Title: Re: O.S mufflers for the old .40S engine??
Post by: Steve Helmick 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
Title: Re: O.S mufflers for the old .40S engine??
Post by: M Spencer on July 09, 2015, 08:13:44 PM: I think you mean the ' Jetstream ' ,

(http://thumbs4.ebaystatic.com/d/l225/m/mYuH6nqAEqekmWGylTQKPsg.jpg)

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

(http://static.rcgroups.net/forums/attachments/2/7/9/9/3/6/a5424136-132-1.4.13%20040.jpg)

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

(http://i.ebayimg.com/00/s/MTIwMFgxNTk5/z/xX0AAOSwyQtVhgNR/$_35.JPG)

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

(http://i.ebayimg.com/00/s/NDgwWDY0MA==/z/SBAAAOSw6BtVUVjN/$_57.JPG)

pictures are filched . Youd need to CLEAN any Ive Got ! . ;D
Title: Re: O.S mufflers for the old .40S engine??
Post by: Trostle 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
Title: Re: O.S mufflers for the old .40S engine??
Post by: Avaiojet on July 10, 2015, 04:57:51 AM: Frank,

I have some, I'll take a look.

Footprint has to match up.
Title: Re: O.S mufflers for the old .40S engine??
Post by: Bill Johnson 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.
Title: Re: O.S mufflers for the old .40S engine??
Post by: Robert Zambelli 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.
Title: Re: O.S mufflers for the old .40S engine??
Post by: YakNine 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.