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JBA engines, good or bad.

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Old 04-15-2009, 02:08 AM
  #1
martenson
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Default JBA engines, good or bad.

Hi.

I just ordered one JBA 120 AR and one JBA 61 A.
Any information on these engines?

Hope they a good, atleast the price was unbeatable.

Thanks.
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Old 04-15-2009, 02:32 AM
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w8ye
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Default RE: JBA engines, good or bad.

There's been some talk about them the last few years

There have been a couple carb problems early on but most people like them

Enjoy
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Old 04-15-2009, 09:34 AM
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Default RE: JBA engines, good or bad.

I am using F type JBA 56.They have a different(heli type) carb.Im happy with them.Engineering is good.No debris inside.Where did you buy them?
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Old 04-15-2009, 03:53 PM
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Default RE: JBA engines, good or bad.

http://www.rcuniverse.com/forum/fb.a...762745&key=JBA

Quote:
They both started by hand in usually 1 flip. The only time I used a starter was when I was doing the rpm runs and ran short runs to tune for max rpm, then shot down and changed props. The engine never got a chance to really cool down. I bumped it with a starter and it went right off.

To tell you the truth, I have looked for a down side and haven't found one. It just starts up, runs good and keeps on running. And it will definitely out turn any .46 out there. Maybe not a Jett on a small 10-6 prop, but probably would on a big one."

Ed (Moorman)
I only own one JBA .56, but it's been a pleasure to own and fly so far.
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Old 04-17-2009, 08:56 AM
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martenson
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Default RE: JBA engines, good or bad.

Got my engines today, will pick them up at the post office and head home soon.
I will start run in on the 120 today, I have to make a new batch of 80/20 fuel first.
After some running time I will report to you all.
I will save my 61 to a rainy day

Turk I bought them here in Sweden, paid $240 for both including shipping

Take care.
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Old 04-17-2009, 01:30 PM
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Default RE: JBA engines, good or bad.

Now I'm done for to night.
I have now run 3 420cc tanks of fuel in my new 120 AR

It started on the first flip, had to adjust the carb pretty much, not set up from the factory.
I used a Graupner 15/8 and 80/20 methanol/castor.
First tank was a rich 5000 rpm run and it took for ever, so it's not hard on fuel.
I then filled it up and leaned both low speed and high speed needles and I got a 2500 rpm idle and a 7500 rpm wot.
So I thought that sounded week so I read the instruction and saw that idle should be 2500 rpm but wot 8700 rpm.
And it said to use 10% nitro, I don't like nitro in a sunday flyer so I took the head of and found 2 shims, I took both out and tried again.
Now I get a steady 2300 rpm and 8500 rpm wot wich I'm verry happy with.
I used the JBA plug that I got with the engine.

Conclusion.

It's a real good engine, solid nice fit and I would easy recomend it to any one.

On Sunday I will do flight test, and the engine is in a big Super Chipmunk mounted inverted.

Take care.
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Old 05-02-2009, 09:53 PM
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Default RE: JBA engines, good or bad.

Hello-

I am DeWayne of knoxHobbies and We now are stocking and selling the JBA line in the USA.. We stock all engines including the "f" series + car and heli versions and will be glad to support all customers..

DeWayne
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Old 07-05-2013, 05:49 AM
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Default RE: JBA engines, good or bad.

Have a JBA 120 on a Krill, Velox Revolution II. Starts on the first back flip, even when hot. Had to do some tinkering with the carb settings but this thing hauls the freight. Very good engine.
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Old 07-06-2013, 02:24 PM
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Default RE: JBA engines, good or bad.

Zombie thread alert!
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Old 07-09-2013, 12:56 PM
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Default RE: JBA engines, good or bad.

That's OK, I've purchased another JBA .56 2-stroke since posting here, and it was as reliable and as friendly as the first. JBA engines are a real hidden gem!
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Old 07-09-2013, 03:29 PM
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Default RE: JBA engines, good or bad.

I broke in and test flew BigEd's first JBA .56. I was writing for R/C Report at the time and live in Florida, whereas it was winter in Omaha where he lives. It is one good running engine. As soon as I sent it back to him, I ordered my own.

I did a bench test of the JBA and compared it to the OS .55AX. Let me see if I can find those rpm figures. I didn't try that many props, just what I had handy. Fuel was Omega 10% castor blend. Temp was 65-70 deg. RPMs in thousands.
OS .55AX JBA .56
10-6 15.7 -
11.5 14.0 -
11-6 12.8 11-6APC 12.8 11-6MA
11.7 12.2 11-7APC 12.4
11-8 RevUp 11.3
12-6MA 11.6
12-7APC 10.8
12.25-3.75PAC 13.0

I have never had a bit of trouble with the carb.

I tried the JBA muffler, a Tower .46 muffler and the OS .55 muffler on the JBA. The JBA stock muffler was 400 rpm faster that either of those.

The OS responds to a tuned muffler (Jett or Ultra Thrust) very well. 1700 rpm of the 11-6 and 1500 rpm of the 11-7. The OS is port timed better for tuning.

The JBA gets a moderate boost from a Jett. 11-6A 1000, 11-7A 1200, 11-6MA 700, 12-6MA 400. The JBA gets some boost, but not that much. It seems to be more sport timed. I did not feel the surge when the rpm hit the sweet spot like I did on the OS. The JBA, in my opinion, is a great buy if you don't mind a few tanks to break it in.

By the way, Turk is the real expert. When BigEd and I bought our engines, 3-4 years ago, Turk was telling everyone how to run them. He's been flying them for a long time. I only have 1 and several other types of engines so mine doesn't get used that much. He can tell you more about carbs and longevity.
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Old 07-10-2013, 11:39 PM
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Default RE: JBA engines, good or bad.

Hi Ed,thanks for compliments.

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