russm

i just purchased this engine, any thoughts? i'm also installing a rossi 46 on a phoenix strega, and need a muffler ext. i contacted the dealer in ca. and there is not a ext. available for this engine. he is sending me something that may work. any other ideas would be helpful. russm

Cyclic Hardover

My Feedback: (3)

Well, most thoughts in past posts are this is suppose to be one heck of an engine.

rmenke

My Feedback: (13)

Contact Morris Hobbies, they often carry universal extensions, also Don's Hobbies. As to the Jett 60, hope its the LX which is good for another 900 rpm, or so and will pull one heck of a prop. Follow Jett's break-in process to the letter, and you will have a great engine. Will turn over 18k, idle very well and transition like you have never ever seen, all with a racing prop yet. I have 3 Jett engines and recently ordered my 4th, yes the 60 LX. My 50 is a great runner with the black pipe. You will enjoy this engine. You can idle out to the strip, and hit the throttle as hard as you want, or can handle. Carefull not to torlque out!!!!!!!!!!. ENJOY

Crazy4Flight

My Feedback: (540)

I made one for my Jett .50 in a Wild Hare LR-1.

If ypu cant buy one that is out there then contact me. Bob

vasek

My Feedback: (4)

rmenke, what is the difference between the RED and the BLACK pipe?

thnx,V.

angelrcdesign

My Feedback: (40)

The black muffler is a SS M. and its tune for higher rpm. (pylon props)

The red one is for more torque.

Bod has more info on this. (Bob27)

Mike Connor

My Feedback: (5)

Actually there are 3 tuned mufflers available from Jett. The standard long red one. The shorter red SS (standard on the SJ60LX) and the shortest black one that is standard on the Q-500 racing engines. The shorter the muffler the higher the rpm but at the expense of prop size.

vasek

My Feedback: (4)

I want to order an SJ .50 for a Patriot (.40) so can anyone tell me which muffler would optimise the speed for this plane?

1- standard RED

2- SS RED

3- short BLACK

thanx! V.

bob27s

My Feedback: (19)

Get the standard configuration on the SJ-50. Standard Jett-Stream comes with it. It works best on the .50 with a 10x6 or 9x9 prop. The Patriot is a big plane, can hit up to about 120-130 mph - but it needs some prop out front, and does not fly well with most of the pylon blades.

The 60LX comes with the Super Sport (SS, red) muffler as standard equipment.
The LX can easily handle a 10x6 with the muffler - hits the proper tuning range easily.

Bob

bob27s

My Feedback: (19)

Thanks Mike

Just for reference, on the 40-60L size mufflers.... when used on the Jett .40/.46/.50/.60L engines (and with other engines typically)

Standard is designed for between 15,000 and 18,000 rpm (minimum and max suggested ground peak rpm)

SS muffler is designed for 17,000 and 19,500 rpm (target for the 60LX engine)

Black q-500 racing muffler 18,000 - 20,500

Usually best to prop lighter - allow more rpm. Do not lug it down below the bottom limit.

As noted, you have to select a prop that hits the range. And, I highly recommend that any prop that will be turning over 18,000 be one of the D-1 series racing props, or a suitable carbon fiber prop.

And there is actually a 4th muffler available, the 60L Torque muffler - designed for 13,000 to 16,000 range. A standard SJ-60L will happily turn an 11x5, 11x6, or 10x6, 10x7, 10x8.

Mike Connor

My Feedback: (5)

Thanks for posting those numbers again. I was sure I had them but couldn't find them. I am always afraid I will give out bad info and these numbers will help.

vasek

My Feedback: (4)

thanx 4 the info Bob!

V.

russm

bob, why is it with these hi-perf. engines the muffler dosn't fit w/ out extentions or butchering the plane. examples are as follows, h-9 u-stick w/ a jett 45, phoinex strega w/a rossi 46,and a jett muffler -o.s. 46 fx on a w. models sky raider. i did order muffler extns. for my jett products. in the future i am going to stick with jett for my hi perf. engines in the future. russm

bob27s

My Feedback: (19)

Well... a few reasons....

1) Most commercially available engines engines use to come with mufflers that were off-set a bit - expansion chamber type. In a lot of cases, you still had to adjust the airframe to fit the muffler. Carve, adjust as needed.

2) Those planes were not ARFS..... so nobody gave it a second thought when fitting an engine --- it was just the way things were.

3) Too many planes these days are ARFS. Few designs leave any installation flexibility. Thus, any work required to properly accomdate the powerplant is considered 'butchering'. Almost all of the ARFS you noted are (unfortunately) designed for 4-c engines. Rarely was thought given to a full size 2-c muffler installation. Look at the H9, World Models manuals- you will see what I mean. Try to find a good photo of a 2-c muffler install.

The Toni is a good example. They never expected anyone to use anything other than an OS91FS in this.
. So getting a 2-c in there, with ANY muffler, is a serious PIA. Dub actually developed the 90LX-T to suit this specific installation - special extensions, and a special muffler so you do not lose performance with the extensions.

Although, I have set up an ultrastick with a stock SJ-50 engine, no extensions or anything..... not a big deal. I recall Dennis and Richard ran there big Ultra-sticks with the SJ-120 and stock jett-stream. Engine side mounts - muffler under the belly. No fit problems or extensions required either.

4) Those scale planes assume you are using a cheap, pitts type expansion muffler, if you are running 2-c - in other words, buy a muffler that fits - rather than design the plane to fit the muffler.

5) Tune mufflers are shaped that way for a reason. If you want a tune pipe, or tuned muffler performance, you adjust the plane to accomodate the muffler (see #1). Classic pattern ships are a good example.

There is a viable alternative to the stock mufflers - For some installations, a turbo-jett incowl muffler works out best. This is a tuned exhaust - the Jett and other engines love them. They fit inside of many scale installations very nicely.

Although, in the case of an LX engine, you would not want to use the turbo. But where you do use a turbo-jett - is usually where you DO want a bigger size prop, and a bit lower rpm (draggy scale planes). In that case one of the standard Jett engines combines great to increase both torque and rpm.

The P-51 shown here below is SJ-46 powered - I put a 12x4 prop on it to actually slow it down (structural problems in the tail). The engine runs great with the turbo-jett and that prop. It will not turn the prop using the jett-stream, at least not that well.





Happy Halloween!
Bob

russm

bob, thanks for your reply. russm

ChuckL

My Feedback: (2)

So why does my 60LX I just got a couple months ago have a gold Muffler.

bob27s

My Feedback: (19)

I think Dub started making a distinction between the standard engines and the LX engines in the muffler color. just so both of the LX engines are gold.

ChuckL

My Feedback: (2)

Cool Bob thanks, I though I had the wrong muffler, but I really like the looks of the gold.