1QwkSport2.5r

The side exhaust is actually a little more flow friendly than the rear exhaust configuration generally, but Dub says the rear exhaust and side exhaust engines run the same. The LX engines are timed higher than the standard engines and come with the gold muffler standard. A tuned pipe can be added and Dub tunes the pipe to your specs. He sent my 56LX with the header 1/2" longer than "peak" length so when the engine is broke in and running good and not blowing plugs, he instructed to cut 1/2" off the header and go play. I have a standard .35 as well and it will not turn the advertised ground rpm published on Dub's site even after a couple gallons of fuel. I suspect the elevation/climate I am in has a lot to do with it. It's down about 700-1000rpm at peak from where it should be. I concur with airraptor on the bearings. Keep an eye on them in the .35.

jasonvo

Thanks for the info on Jett BSE .35, I asked Dub do the break-in for me and check the engine after break-in.

1QwkSport2.5r

All Jett engines are test-run at the factory. Why ask him to do the full bench break-in? You're not learning how the engine runs or how to handle it (needle settings, fuel tank setup) by having him do so.

jasonvo

I don't want to spend time on break-in the engine, it bother my neighbor I had experienced with nitro engine so tuning is not a problem. Thanks for the input, I will keep my eyes on Jett engine.

1QwkSport2.5r

Good luck with that.

airraptor

My Feedback: (66)

break the engine in while flying it. Run it rich on a smaller prop.

jasonvo

Good Idea, we can break-in the engine and have fun the same time

jasonvo

what prop size and engine you are running sir?

airraptor

My Feedback: (66)

speed was running a Rossi 61 with a pipe. I think it turned a 11x11 prop at 14,000 or so.

jasonvo

no wonder

jasonvo

Updated Rpm from my Novarossi R26CR fully broken-in with Macs Tuned pipe.

Nitro 15% :
MA s2 scimitar 8x6 17,500 rpm with Macs tuned pipe and engine mods 19,800 rpm
APC 8x6 15,900 rpm with Macs tuned pipe and engine mods 17,800 rpm
Prop size per Novarossi website for this engine 8x4 - 8x6, 9x5

jasonvo

Sir, was this data after engine fully broken-in? do you have any update?

sarpet

Ithink it was broke in.
9" props are too big with standart muffler.
Apc 8x4 ,15%nitro is great 19200rpm ground

Pond Skipper

Published on Nov 28, 2015
OS FX .25 with MACS Tuned Pipe APC 8x8
16,149 rpm / 122 mph / 3.1 lbs thrust / .994hp or 742w
Quick rev up during break in mode, header cut to 4.25"
Tru Turn 1/4-28 spinner nut.

Should do 17k after break in was about 3/4th turn rich.