Strykaas

Just a single question,


Can u tell me just a bit about your experience with these engines ?

Actually, they should have made huge progress since some OS engineers joined them a few years ago... What's your feeling about this ?

spuck5644

The TT-46 Pro is the only one I have had any experience with. It was/is a great little engine and trouble free. We are using it in my grandson's trainer and it gives superior performance. What a bargain.
Steve

apalsson

My Feedback: (1)

I have a TT 91 FS in one of my planes.
It's still new-ish and still a bit hard to start as I run it quite rich.
There are several posts here saying that they take long to break in properly and I agree with that.
Apart from that, a great little engine.
More powerful than other engines I have seen in the same class and very reliable.
I would not hesitate to buy another one.

FLYBOY

My Feedback: (11)

I have been running the TT 70 in my heli for a few years. Great engine. Had my first real auto this weekend since I bought it. You would think they would be able to make the damn thing keep running when you run out of fuel but it quit anyway. Great engines.

Ugo Ferrari

My Feedback: (1)

I have five (5) TT .46 Pros and two (2) TT .61's ! All are a joy !
The .46's are in a GP Stick and Avistar... The .61's are in a Astro Hog and a U-Can- Do. I run them all on 10% fuel. Idle is great ,and excellent transition to high blow .
If I were O.S.,... I'd be worried !!

And the price is RIGHT !

Ugo

Strykaas

I've compared the TT Pro 46 and the OS46 Fx. I'm really astonished by the mass gap. Why is there such a gap ?
46Fx : 1.59 @ 16,000 (374 grams)
46LA: 1.2 @ 16,000 (270 grams)
TT46 Pro : 1.43 @ 16,000 (449 grams)

sport10

You can not go by the manufacturer's specs. The mass gap is definately due to the fact that OS reports the mass of their engines without a muffler. This is a pretty useless way of reporting the mass because you have to use the muffler to run the engine. I own both the TT pro 46 and the FX 46 and they are similar in weight and size. The difference in power is around 100 rpm with the FX having the slight edge in most cases. The user friendlyness of the two engines are about the same. I do like the sweep needle valve on the TT better than the remote needle of the OS version. Due to the thick and harder alloy of metal used in the TT engines liner I believe the TT is going to outlast the OS. We will see in a couple of years. Both are good running engines.

George E.

My Feedback: (16)

Strykaas

Your weight for the OS is without the muffler and your weight for the TT includes the muffler.

I have both and they weigh the same within a half ounce. Both engines are equally user friendly and make the same power; I tached both to within 200rpms using Tower Mufflers and identical props.

Both come with equally lousy mufflers that kill their performance. Try a tower muffler or drill out the stock one; at least remove the baffle.

Strykaas

Thank you guys for having shed new lights on these engines.

This confirms what I've heard elsewhere. Hope OS engines will get even tougher competition, which will decrease prices for us, end users, definitely.

BTW, these TT engines are ABC or ABN ?

sport10

Both the OS and the TT are ABN liners. The TT has a thicker, harder nickel plateing than OS. TT has never had any peeling problems to date I am aware of.

Strykaas

Good news nickel plating is better than OS's. How about break in ?

BTW, do u know why they have switched from chrome to nickel ? I've heard that It was merely to reduce costs, given that chrome waste disposal is quite expensive in some countries. What a pity, chrome was a good material from our point of view, and paying some extra dollars for it wouldn't have bothered me either...

Gene Chernosky

My Feedback: (182)

TT ABN engines need a HOT break-in. DON'T do the rich run routine or you could possibly ruin the engine! Don't run them full lean at first, but definitely past the rich/lean break. Typical break-in for a TT PRO .46 is to run it up with a 10x6 to get the needle set to run lean...this is a short as possible run...let it cool afterwards. Then put a 9x6 on it and take it to 16.5K RPM and hold it there for two minutes...let it cool a LONG time. Then put an 11x5 on it (this engine's favorite prop IMO) and run it through 3-4 eight ounce tanks at full throttle just leaner than the rich/lean break...let it cool well between tanks. After that put it on a plane and go fly it...it will just keep getting better. BTW, all props are APC.

The ONLY thing that upsets me with Thunder Tiger presently is that their part support is VERY little to be desired. Typically, a lot of items are on back order and there is no idea when they will be available. I hope this situation changes soon!

Further, I've owned just about every engine they make except the .07, .61 & 1.20 two-cycle ones. They are inexpensive and do the job quite nicely IMO...particularily if you are a 'sport' flier. Currently I own 2-GP.15's, 2-GP.25's, 2-PRO .36's, 1-GP.42, 10-PRO.46's and 2-FS.91's. No, they aren't all in use...but I'm a packrat.

jp300

My Feedback: (5)

You can't go wrong with a PRO .46!!!!! It was my first engine and I knew absolutely nothing about maintaining it (I was only 12) and after all those years of abuse it still runs better than an OS right out of the box!!!!!

Strykaas

What exactly do you call a "rich/lean break" ?

Gene Chernosky

My Feedback: (182)

When your engine is running rich and then by turning the needle valve IN (or leaner) it 'breaks' into a clean two-cycle run...that is a rich/lean break.

Geoff-RCU

Also called the 4-cycle/ 2-cycle break. When extremely rich, 2-cycle engines will skip firing every other time, hence the term, "4-cycling." they run waaay cold when doing this, so the upper cylinder doesn't expand sufficiently, and you could literally wear the engine out instead of wearing it in!

Checklst

I have a 46Pro and 2 TT91fs and than all have run great from the start. Good value for the money.

Strykaas

Thanks

Rendegade

HAs anyone had any experience with pro 120??

I'm thinking of Jamming one into an Ultimate.

Hans Meij

Very good engine.
8500 - 8700 / 16*8 APC / with the standard muffler / low nitro
9500 / 16 * 8 On the genesis one piece muffler (which is also 100gr lighter than the original muffler)

1Jimbo

My Feedback: (2)

I have two TT.36's VERY good power. It's the only TT with a chrome liner.
The .46 pro = GREAT bang for your buck engine.
The .42GP is an OS.FP clone. very good little plain bearing engine. That's the only TT engine I can talk about first hand.

Mad Mat

My Feedback: (2)

I have two TT 1.20 pro

Luv em.

Mine needed a perry pump when running a pitts muffler.

Starts great. Runs well on 5-10% nitro. Will take off your finger trying to start it if you try 15%. Just my observations.

I have one on a U can do.


Mat

Strykaas

Could you feel any real difference between nickel and chrome liners ?

rclooney

I have a .15mx and it is a great little runner. it actualy made my universal joint in my boat expload. i had a small prop aswell as it isn't even run-in yet. i got it for £30 at a model boat show. is a bit hard to start when rich but is a great runner even at running-in.

1Jimbo

My Feedback: (2)

Chrome is more durable than nickel and I wanted to do some timing work on the .36's that's why I was pleased to see the chrome liner. I was also very suprized to see a VERY good piston and liner fit. The porting and liner was also a perfect match, you don't see that very often in an engine in that price range. Both of my .36's are now out pulling my Jett.30's.