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Thunder Tiger engines - 8/21/2003 9:19:02 PM   
Strykaas



Posts: 3901
Joined: 3/21/2003
From: Paris, FRANCE
Status: online 		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 ?

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TT - 8/21/2003 9:22:01 PM   
spuck5644



Posts: 276
Joined: 3/19/2002
From: Springfield, IL, USA
Status: offline 		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


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Thunder Tiger engines - 8/22/2003 12:11:15 AM   
apalsson



Posts: 707
Joined: 6/29/2003
From: Ballina NSW, AUSTRALIA
Status: offline 		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.

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Thunder Tiger engines - 8/22/2003 1:33:24 AM   
FLYBOY



Posts: 8687
Joined: 1/7/2002
From: Missoula, MT, USA
Status: offline 		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.

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Thunder Tiger engines - 8/22/2003 2:04:53 AM   
Ugo Ferrari



Posts: 402
Joined: 1/15/2002
From: Ft.Walton Bch.|, FL, USA
Status: offline 		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


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Thunder Tiger engines - 8/22/2003 2:32:36 AM   
Strykaas



Posts: 3901
Joined: 3/21/2003
From: Paris, FRANCE
Status: online 		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)

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Thunder Tiger engines - 8/22/2003 3:23:58 AM   
sport10


 

Posts: 715
Joined: 12/31/2001
From: Loxley, AL, USA
Status: offline 		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.

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Thunder Tiger engines - 8/22/2003 4:18:30 AM   
George E.



Posts: 1064
Joined: 3/27/2002
From: Medford, NJ, USA
Status: offline 		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.

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Thanks for your replies :) - 8/22/2003 5:24:55 AM   
Strykaas



Posts: 3901
Joined: 3/21/2003
From: Paris, FRANCE
Status: online 		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 ?

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Thunder Tiger engines - 8/22/2003 7:26:16 AM   
sport10


 

Posts: 715
Joined: 12/31/2001
From: Loxley, AL, USA
Status: offline 		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.

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Thunder Tiger engines - 8/22/2003 3:33:05 PM   
Strykaas



Posts: 3901
Joined: 3/21/2003
From: Paris, FRANCE
Status: online 		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...

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Break-in, etc. - 8/22/2003 5:52:56 PM   
Gene Chernosky



Posts: 503
Joined: 12/5/2001
From: Ingleside, TX, USA
Status: offline 		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.


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Thunder Tiger engines - 8/24/2003 9:12:55 AM   
jp300


 

Posts: 17
Joined: 8/17/2003
From: Sumter, SC, USA
Status: offline 		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!!!!!

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Re: Break-in, etc. - 8/24/2003 5:55:25 PM   
Strykaas



Posts: 3901
Joined: 3/21/2003
From: Paris, FRANCE
Status: online 		[QUOTE]Originally posted by Gene Chernosky
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. [/QUOTE]


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

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Rich/Lean Break - 8/24/2003 8:35:50 PM