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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Engine Manufacturers Direct Support Forum >> Jett Engineering Support >> sportjet 120
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sportjet 120 - 1/14/2005 4:06:14 AM   
kingtight


 

Posts: 157
Joined: 1/18/2003
From: N.P., BAHAMAS
Status: offline 		What will be the ideal muffler set up for the sport jet 120 in a GSP YAK 54?Im interested in a 120 but dosent want a awkward odd fitting muffler damaging the cowl.
Also is 10% nitro fuel ok for a jet 120 engine,will that low nitro rob the engine of rpms? seeking advice please thanks

< Message edited by hobbsy -- 1/14/2005 12:50:52 PM >

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kingtight~,~
       Post #: 1

RE: sportjet 120 - 1/17/2005 6:39:49 PM   
bob27s



Posts: 4712
Joined: 4/9/2002
From: Cleveland, OH, USA
Status: offline 		Hi, thanks for writing....

First, on the fuel. All Jett engines are designed to run on 15% or less nitro. The ideal fuel for most applications is 10% nitro.

The SJ-120 (big block) and BSE-120L (60 size block) both have about the same performance and power. Take a look at the sizes and weights to select the one best suited for the GSP Yak. You may want to go with the big-block.

Mufflers....

All of the Jett engines are available with the Turbo-Jett in-cowl tuned muffler. This muffler provides you with outstanding broad band power, excellent midtrange and throttle response, and allows you to turn slightly larger props than with the standard Jett-Stream muffler.

If I recall, the GSP Yak has a fairly large cowl. The entire package should fit in there quite nicely.
(THE BSE-100 and turbo fit inside the Extream Flight Yak cowl without issue).

-

Either the SJ-120 or BSE-120 is available with the Turbo-Jett as the supplied muffler. Email Dub directly at jettengr@sbcglobal.net for current pricing. Engines typically ship within about a week.

As an example...
I currently run my BSE-100 and turbo-jett combination using an APC 15x8, and the combination turns at 10+K rpm. The 1.20 engines will turn about 1" more prop somewhere around 9000-9500 rpm.

I hope this is helpful. Feel free to ask if you have any other questions.

Bob Brassell

< Message edited by bob27s -- 1/17/2005 6:42:11 PM >


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Bob Brassell
Jett Engineering - Engine Mfg Support Forum Host

(in reply to kingtight)
       Post #: 2

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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Engine Manufacturers Direct Support Forum >> Jett Engineering Support >> sportjet 120
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