Whats the difference between the TT 40 and the 42? Which is best?
Thanks

2 Probably won't notice much diff. Look at the HP produced and the weight of each engine. Probably won't see much diff.

Ok, had some time and researched it for you.

GP-42 12.6 OZ 1.1 HP at 16,000 RPM
Pro 40 16.03 OZ 1.22 HP at 16,000 RPM
Pro 46 15.82 OZ 1.43 HP at 16,000 RPM

For my money, I wouldn't touch the 42, and with the 46 being lighter and putting out more power, I would go with it over a 40 any day of the week! Good engines though. I have one and like it. Never had a problem with it. Here are some sites for you.

http://www.acehobby.com/acehobby/pro...ies/index.html

http://www.acehobby.com/acehobby/pro...ies/index.html

FLYBOY

Thanks a lot for your research. I am asking cause theres a guy offering me one on a trade and I was wondering if it would be as good as the 42.

Thanks again

If the .40 is a Pro40, it is a better engine than the GP42. The Pro series are ball-bearing engines. If it is the older GP40, there is very little difference between them except that the .40 may be about worn out. I don't think the GP40 has been made in about 6 years.

Thanks for your input. Im rather confident that the engine in question is the older gp40. As you said, i may be worn out but then again, thats just a guess. Ill check into that.

Thanks

The Pro .40 is a ball bearing engine and actually there is no reason to buy it. The .46 Pro is in the same case, just bored out. This is normal for most all manufacturers.

The .42GP is a plain bearing, air-bleed carb engine. It is in the same class as the OS LA series. The only thing is, the TT .42GP is a great engine. More power than anything in its class and it's biggest attribute is its weight, or lack of. It is a light engine.

Some people, especially those less experienced in the hobby, only consider power. (And, by the way, forget all the advertised horsepower ratings. For non-racing engines they are totally worthless.) What you want to consider for a high performance plane is power-to-weight. The TT .42GP, in particular with a mousse can pipe, really works well in a fun fly type plane. They sell a bundle of these little jewels.

At one time, Thunder Tiger sold a .46GP. If they did today, it would take sales away from the Pro version. TT has even made it so you can't change carbs by giving it a screw down, flat carb mount instead of the drop-it-in-the-hole and tighten the nut type carb. That little engine screams on a 10-6 or an 11-4 prop. And there are no ball bearings to rust so you don't need after run oil.

.02 cubic inches