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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Engine Manufacturers Direct Support Forum >> Jett Engineering Support >> Jett .46?
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Jett .46? - 7/14/2003 12:35:41 AM   
BeauMiller



Posts: 151
Joined: 9/21/2002
From: Kaysville, UT, USA
Status: offline 		I bought this engine off RCU a few weeks ago and just got to running it today. I was told it is a Sport Jett .46 with an old style carb. It was turning an APC 8.75 x 7.5 pylon prop around 17.5k on Powermaster 10%. Is that about right? I would appreciate any more info on this engine that you may know.

Thanks,
Beau

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another pic...... - 7/14/2003 12:36:23 AM   
BeauMiller



Posts: 151
Joined: 9/21/2002
From: Kaysville, UT, USA
Status: offline 		side view

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Jett .46? - 7/14/2003 5:46:09 AM   
Spike373


 

Posts: 14
Joined: 6/26/2003
From: Ovid, MI, USA
Status: offline 		I have that motor on a Quickie 500. It screams. I run 20% blue thunder in it. I run a 9x6 on it for most flying. I have run the APC 8.75X8 on it and it is scary fast! I is the center of attention when I fly it. I have never tached it. Crappy transition through midrange. I would never put it in somthing that was not made for speed as I the carb is not the greatest. Maybe it is me? I have no problems with my other engines. Maybe the newer carbs are better? This is still the best performing motor I own. It screams! ---Mike

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Jett .46? - 7/14/2003 7:17:42 AM   
BeauMiller



Posts: 151
Joined: 9/21/2002
From: Kaysville, UT, USA
Status: offline 		Mike,

Transition is fine for me so far on the ground. One thing I did notice is that the idle is super high. My tach was saying 4.5 to 5.0! I've got it on a Dominator 500 right now so deadstick landings are the norm.

One question for Bob that I forgot to ask: Is there anyway to use a regular spinner on this engine? The spinner nut is attached to a bolt which screws into the crank. I guess this is normal for quickee type motors?

Beau

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Jett .46? - 7/14/2003 7:34:26 AM   
Spike373


 

Posts: 14
Joined: 6/26/2003
From: Ovid, MI, USA
Status: offline 		I just looked at you pic. You have a different carb. Mine is red anodize aluminum not cast. I bet that is why I have not had as good of transition? Cool motor! ---Mike

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Jett .46? - 7/14/2003 5:23:29 PM   
bob27s



Posts: 4895
Joined: 4/9/2002
From: Cleveland, OH, USA
Status: offline 		Hi Beau,

Thanks for writing.......

You have a classic on your hands there

That is a 1993 vintage Sport Jett engine (image attached). If it is 10 years old, been flown a lot, and is still turning 17.5K fairly well.... it is in good shape.

The 10% fuel you are running is good. We run all of the engines on 10 to 15% nitro fuel. More nitro is not a big help for the engines.

Current versions of the engine will turn a full APC 10x6 upwards of 16,500 - 17,000 rpm. The muffler on yours is tuned for basically the 16K to 18K RPM range, so stick with props that turn in this area and the engine will remain happy.

As for the spinner.......
There is a 1/4-28 prop stud (replaceable) that screws into the crank shaft. The spinner nut should not be 'attached' to it. The stud should be long enough to use a standard spinner/backplate combination, but on some of the original engines they may have been a bit short. Replacement studs are available. You will want to use a GOOD aluminum spinner only. Tru-Turn, Dave Brown spinners are recommended.

The engine should idle quite well. All of the SJ engines and carbs are extreamly smooth (even the original Ram-Jett carb as shown on your engine), and you should expect a reliable idle down around 2500-2700 rpm, with excellent transition. The low speed needle may be way out of adjustment. Take a look at the jettengineering.com web site in the TECH section for instructions on setting the low speed needle.

Let me know if I can be of additional help

Bob Brassell

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